[1] Muscle fatigue is caused by the accumulation of :
A.
Pyruvic acid
B.
Lactic acid
C.
Oxalacetic acid
D.
Uric acid
Ans:
Lactic acid
Explanation :
It was once believed that lactic acid build-up was the cause of muscle fatigue. The assumption was lactic acid had a "pickling" effect on muscles, inhibiting their ability to contract. Produced as a by-product of fermentation, lactic acid can increase intracellular acidity of muscles.
[2] Baking soda is:
A.
Potassium carbonate
B.
Sodium hydroxide
C.
Sodium carbonate
D.
Sodium bicarbonate
Ans:
Sodium bicarbonate
Explanation :
Baking Soda is Sodium bicarbonate or sodium hydrogen carbonate. It is primarily used in cooking (baking), as a leavening agent.
[3] Which of these acids is not organic in origin?
A.
Lactic acid
B.
Sulphuric acid
C.
Citric acid
D.
Oxalic acid
Ans:
Sulphuric acid
Explanation :
Sulfuric acid is produced from sulfur, oxygen and water via the conventional contact process (DCDA) or the wet sulfuric acid process (WSA). Sulfuric acid can be produced in the laboratory by burning sulfur in air and dissolving the gas produced in a hydrogen peroxide solution. SO2 + H2O2 --> H2SO4
[4] Which one of the following types of coal contains a higher percentage of carbon than the rest?
A.
Bituminous coal
B.
Lignite
C.
Peat
D.
Anthracite
Ans:
Anthracite
Explanation :
Anthracite is the coal that gives the most energy and the least pollution (it produces lots of CO2). It is the ideal fuel for power station.
[5] A mixture of water and alcohol can be separated by -
A.
Filtration
B.
Evaporation
C.
Distillation
D.
Decantation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
[6] Setting of plaster of Paris involves –
A.
dehydration process
B.
hydration to form other hydrates
C.
oxidation process
D.
reduction process
Ans:
hydration to form other hydrates
Explanation :
The setting of plaster of Paris takes place by hydration due to the formation of a solid crystalline hydrate and hardening of Plaster of Paris is hydration reaction, which is reverse of the dehydration of gypsum. Plaster of Paris quickly sets to a hard mass when made into a thin paste with water. A slight expansion takes place in the process and heat is evolved. This process is exothermic.
[7] The common name for the com-pound having formal NaOH is –
A.
Caustic soda
B.
Caustic potash
C.
Soda ash
D.
Sodium hydroxide
Ans:
Caustic soda
Explanation :
Sodium hydroxide, also known as lye or caustic soda, has the molecular formula NaOH and is a highly caustic metallic base. It is a white solid available in pellets, flakes, granules, and as a 50% saturated solution. It is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.
[8] Energy stored in a coal is -
A.
kinetic energy
B.
potential energy
C.
chemical energy
D.
nuclear energy
Ans:
chemical energy
Explanation :
Chemical energy is stored in coal. Coal is a Hydrocarbon. When coal is burnt its chemical energy comes out in the form of light and heat energy which result in formation of vapors of Carbon Dioxide (CO2) and water (H2O).
[9] Which of the following is the most common element in the Universe?
A.
Nitrogen
B.
Oxygen
C.
Hydrogen
D.
Carbon
Ans:
Hydrogen
Explanation :
The most abundant element in the universe is hydrogen, which makes up about 3/4 of all matter! Helium makes up most of the remaining 25%. Oxygen is the third most abundant element in the universe. All of the other elements are relatively rare.
[10] Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are -
A.
Boron and Cadmium
B.
Boron and Plutonium
C.
Cadmium and Uranium
D.
Uranium and Boron
Ans:
Boron and Cadmium
Explanation :
Since the continued chain reaction of a nuclear fission reactor depends upon at least one neutron from each fission being absorbed by another fissionable nucleus, the reaction can be controlled by using control rods of material which absorbs neutrons. Cadmium and boron are strong neutron absorbers and are the most common materials used in control rods. In the operation of a nuclear reactor, fuel assemblies are put into place and then the control rods are slowly lifted until a chain reaction can just be sustained.
[11] The most commonly used chemicals in the artificial rainmaking or cloud seeding are –
A.
Silver Iodide (AgI)
B.
Sodium Chloride (NaCl)
C.
Dry Ice (Frozen CO2)
D.
All of the above
Ans:
Silver Iodide (AgI)
Explanation :
Cloud seeding, a form of intentional weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports. The most common chemicals used for cloud seeding include silver iodide and dry ice (solid carbon dioxide).
[12] Which of the following is not a greenhouse gas?
A.
Hydrogen
B.
Carbon dioxide
C.
Nitric oxide
D.
Chlorofluorocarbon
Ans:
Hydrogen
Explanation :
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. In the Solar System, the atmospheres of Venus, Mars, and Titan also contain gases that cause greenhouse effects.
[13] Wax used for making candle is chemically a mixture of –
A.
aliphatic hydrocarbons
B.
aromatic hydrocarbons
C.
cyclic hydrocarbons
D.
aliphatic and aromatic hydrocarbons
Ans:
aliphatic hydrocarbons
Explanation :
An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.
[14] The gas used in the artificial ripening of fruits is –
A.
Acetylene
B.
Methane
C.
Ethane
D.
Butane
Ans:
Acetylene
Explanation :
Ripening is a process in fruits that causes them to become more palatable. In general, a fruit becomes sweeter, less green, and softer as it ripens. Even though the acidity of fruit increases as it ripens, the higher acidity level does not make the fruit seem tarter, which can lead to the misunderstanding that the riper the fruit the sweeter. Ripening agents speed up the ripening process. They allow many fruits to be picked prior to full ripening, which is useful, since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being gassed with ethylene. Calcium carbide is also used for ripening fruit artificially in some countries. Calcium carbide reacts with water to produce acetylene, which acts as an artificial ripening agent. Industrial-grade calcium carbide may contain traces of arsenic and phosphorus which makes it a human health concern. The use of this chemical for this purpose is illegal in most countries.
[15] Ruby and sapphire are oxides of –
A.
copper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
It was once believed that lactic acid build-up was the cause of muscle fatigue. The assumption was lactic acid had a "pickling" effect on muscles, inhibiting their ability to contract. Produced as a by-product of fermentation, lactic acid can increase intracellular acidity of muscles.
[2] Baking soda is:
A.
Potassium carbonate
B.
Sodium hydroxide
C.
Sodium carbonate
D.
Sodium bicarbonate
Ans:
Sodium bicarbonate
Explanation :
Baking Soda is Sodium bicarbonate or sodium hydrogen carbonate. It is primarily used in cooking (baking), as a leavening agent.
[3] Which of these acids is not organic in origin?
A.
Lactic acid
B.
Sulphuric acid
C.
Citric acid
D.
Oxalic acid
Ans:
Sulphuric acid
Explanation :
Sulfuric acid is produced from sulfur, oxygen and water via the conventional contact process (DCDA) or the wet sulfuric acid process (WSA). Sulfuric acid can be produced in the laboratory by burning sulfur in air and dissolving the gas produced in a hydrogen peroxide solution. SO2 + H2O2 --> H2SO4
[4] Which one of the following types of coal contains a higher percentage of carbon than the rest?
A.
Bituminous coal
B.
Lignite
C.
Peat
D.
Anthracite
Ans:
Anthracite
Explanation :
Anthracite is the coal that gives the most energy and the least pollution (it produces lots of CO2). It is the ideal fuel for power station.
[5] A mixture of water and alcohol can be separated by -
A.
Filtration
B.
Evaporation
C.
Distillation
D.
Decantation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
[6] Setting of plaster of Paris involves –
A.
dehydration process
B.
hydration to form other hydrates
C.
oxidation process
D.
reduction process
Ans:
hydration to form other hydrates
Explanation :
The setting of plaster of Paris takes place by hydration due to the formation of a solid crystalline hydrate and hardening of Plaster of Paris is hydration reaction, which is reverse of the dehydration of gypsum. Plaster of Paris quickly sets to a hard mass when made into a thin paste with water. A slight expansion takes place in the process and heat is evolved. This process is exothermic.
[7] The common name for the com-pound having formal NaOH is –
A.
Caustic soda
B.
Caustic potash
C.
Soda ash
D.
Sodium hydroxide
Ans:
Caustic soda
Explanation :
Sodium hydroxide, also known as lye or caustic soda, has the molecular formula NaOH and is a highly caustic metallic base. It is a white solid available in pellets, flakes, granules, and as a 50% saturated solution. It is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.
[8] Energy stored in a coal is -
A.
kinetic energy
B.
potential energy
C.
chemical energy
D.
nuclear energy
Ans:
chemical energy
Explanation :
Chemical energy is stored in coal. Coal is a Hydrocarbon. When coal is burnt its chemical energy comes out in the form of light and heat energy which result in formation of vapors of Carbon Dioxide (CO2) and water (H2O).
[9] Which of the following is the most common element in the Universe?
A.
Nitrogen
B.
Oxygen
C.
Hydrogen
D.
Carbon
Ans:
Hydrogen
Explanation :
The most abundant element in the universe is hydrogen, which makes up about 3/4 of all matter! Helium makes up most of the remaining 25%. Oxygen is the third most abundant element in the universe. All of the other elements are relatively rare.
[10] Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are -
A.
Boron and Cadmium
B.
Boron and Plutonium
C.
Cadmium and Uranium
D.
Uranium and Boron
Ans:
Boron and Cadmium
Explanation :
Since the continued chain reaction of a nuclear fission reactor depends upon at least one neutron from each fission being absorbed by another fissionable nucleus, the reaction can be controlled by using control rods of material which absorbs neutrons. Cadmium and boron are strong neutron absorbers and are the most common materials used in control rods. In the operation of a nuclear reactor, fuel assemblies are put into place and then the control rods are slowly lifted until a chain reaction can just be sustained.
[11] The most commonly used chemicals in the artificial rainmaking or cloud seeding are –
A.
Silver Iodide (AgI)
B.
Sodium Chloride (NaCl)
C.
Dry Ice (Frozen CO2)
D.
All of the above
Ans:
Silver Iodide (AgI)
Explanation :
Cloud seeding, a form of intentional weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports. The most common chemicals used for cloud seeding include silver iodide and dry ice (solid carbon dioxide).
[12] Which of the following is not a greenhouse gas?
A.
Hydrogen
B.
Carbon dioxide
C.
Nitric oxide
D.
Chlorofluorocarbon
Ans:
Hydrogen
Explanation :
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. In the Solar System, the atmospheres of Venus, Mars, and Titan also contain gases that cause greenhouse effects.
[13] Wax used for making candle is chemically a mixture of –
A.
aliphatic hydrocarbons
B.
aromatic hydrocarbons
C.
cyclic hydrocarbons
D.
aliphatic and aromatic hydrocarbons
Ans:
aliphatic hydrocarbons
Explanation :
An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.
[14] The gas used in the artificial ripening of fruits is –
A.
Acetylene
B.
Methane
C.
Ethane
D.
Butane
Ans:
Acetylene
Explanation :
Ripening is a process in fruits that causes them to become more palatable. In general, a fruit becomes sweeter, less green, and softer as it ripens. Even though the acidity of fruit increases as it ripens, the higher acidity level does not make the fruit seem tarter, which can lead to the misunderstanding that the riper the fruit the sweeter. Ripening agents speed up the ripening process. They allow many fruits to be picked prior to full ripening, which is useful, since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being gassed with ethylene. Calcium carbide is also used for ripening fruit artificially in some countries. Calcium carbide reacts with water to produce acetylene, which acts as an artificial ripening agent. Industrial-grade calcium carbide may contain traces of arsenic and phosphorus which makes it a human health concern. The use of this chemical for this purpose is illegal in most countries.
[15] Ruby and sapphire are oxides of –
A.
copper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
Sulfuric acid is produced from sulfur, oxygen and water via the conventional contact process (DCDA) or the wet sulfuric acid process (WSA). Sulfuric acid can be produced in the laboratory by burning sulfur in air and dissolving the gas produced in a hydrogen peroxide solution. SO2 + H2O2 --> H2SO4
[4] Which one of the following types of coal contains a higher percentage of carbon than the rest?
A.
Bituminous coal
B.
Lignite
C.
Peat
D.
Anthracite
Ans:
Anthracite
Explanation :
Anthracite is the coal that gives the most energy and the least pollution (it produces lots of CO2). It is the ideal fuel for power station.
[5] A mixture of water and alcohol can be separated by -
A.
Filtration
B.
Evaporation
C.
Distillation
D.
Decantation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
[6] Setting of plaster of Paris involves –
A.
dehydration process
B.
hydration to form other hydrates
C.
oxidation process
D.
reduction process
Ans:
hydration to form other hydrates
Explanation :
The setting of plaster of Paris takes place by hydration due to the formation of a solid crystalline hydrate and hardening of Plaster of Paris is hydration reaction, which is reverse of the dehydration of gypsum. Plaster of Paris quickly sets to a hard mass when made into a thin paste with water. A slight expansion takes place in the process and heat is evolved. This process is exothermic.
[7] The common name for the com-pound having formal NaOH is –
A.
Caustic soda
B.
Caustic potash
C.
Soda ash
D.
Sodium hydroxide
Ans:
Caustic soda
Explanation :
Sodium hydroxide, also known as lye or caustic soda, has the molecular formula NaOH and is a highly caustic metallic base. It is a white solid available in pellets, flakes, granules, and as a 50% saturated solution. It is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.
[8] Energy stored in a coal is -
A.
kinetic energy
B.
potential energy
C.
chemical energy
D.
nuclear energy
Ans:
chemical energy
Explanation :
Chemical energy is stored in coal. Coal is a Hydrocarbon. When coal is burnt its chemical energy comes out in the form of light and heat energy which result in formation of vapors of Carbon Dioxide (CO2) and water (H2O).
[9] Which of the following is the most common element in the Universe?
A.
Nitrogen
B.
Oxygen
C.
Hydrogen
D.
Carbon
Ans:
Hydrogen
Explanation :
The most abundant element in the universe is hydrogen, which makes up about 3/4 of all matter! Helium makes up most of the remaining 25%. Oxygen is the third most abundant element in the universe. All of the other elements are relatively rare.
[10] Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are -
A.
Boron and Cadmium
B.
Boron and Plutonium
C.
Cadmium and Uranium
D.
Uranium and Boron
Ans:
Boron and Cadmium
Explanation :
Since the continued chain reaction of a nuclear fission reactor depends upon at least one neutron from each fission being absorbed by another fissionable nucleus, the reaction can be controlled by using control rods of material which absorbs neutrons. Cadmium and boron are strong neutron absorbers and are the most common materials used in control rods. In the operation of a nuclear reactor, fuel assemblies are put into place and then the control rods are slowly lifted until a chain reaction can just be sustained.
[11] The most commonly used chemicals in the artificial rainmaking or cloud seeding are –
A.
Silver Iodide (AgI)
B.
Sodium Chloride (NaCl)
C.
Dry Ice (Frozen CO2)
D.
All of the above
Ans:
Silver Iodide (AgI)
Explanation :
Cloud seeding, a form of intentional weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports. The most common chemicals used for cloud seeding include silver iodide and dry ice (solid carbon dioxide).
[12] Which of the following is not a greenhouse gas?
A.
Hydrogen
B.
Carbon dioxide
C.
Nitric oxide
D.
Chlorofluorocarbon
Ans:
Hydrogen
Explanation :
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. In the Solar System, the atmospheres of Venus, Mars, and Titan also contain gases that cause greenhouse effects.
[13] Wax used for making candle is chemically a mixture of –
A.
aliphatic hydrocarbons
B.
aromatic hydrocarbons
C.
cyclic hydrocarbons
D.
aliphatic and aromatic hydrocarbons
Ans:
aliphatic hydrocarbons
Explanation :
An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.
[14] The gas used in the artificial ripening of fruits is –
A.
Acetylene
B.
Methane
C.
Ethane
D.
Butane
Ans:
Acetylene
Explanation :
Ripening is a process in fruits that causes them to become more palatable. In general, a fruit becomes sweeter, less green, and softer as it ripens. Even though the acidity of fruit increases as it ripens, the higher acidity level does not make the fruit seem tarter, which can lead to the misunderstanding that the riper the fruit the sweeter. Ripening agents speed up the ripening process. They allow many fruits to be picked prior to full ripening, which is useful, since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being gassed with ethylene. Calcium carbide is also used for ripening fruit artificially in some countries. Calcium carbide reacts with water to produce acetylene, which acts as an artificial ripening agent. Industrial-grade calcium carbide may contain traces of arsenic and phosphorus which makes it a human health concern. The use of this chemical for this purpose is illegal in most countries.
[15] Ruby and sapphire are oxides of –
A.
copper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
[6] Setting of plaster of Paris involves –
A.
dehydration process
B.
hydration to form other hydrates
C.
oxidation process
D.
reduction process
Ans:
hydration to form other hydrates
Explanation :
The setting of plaster of Paris takes place by hydration due to the formation of a solid crystalline hydrate and hardening of Plaster of Paris is hydration reaction, which is reverse of the dehydration of gypsum. Plaster of Paris quickly sets to a hard mass when made into a thin paste with water. A slight expansion takes place in the process and heat is evolved. This process is exothermic.
[7] The common name for the com-pound having formal NaOH is –
A.
Caustic soda
B.
Caustic potash
C.
Soda ash
D.
Sodium hydroxide
Ans:
Caustic soda
Explanation :
Sodium hydroxide, also known as lye or caustic soda, has the molecular formula NaOH and is a highly caustic metallic base. It is a white solid available in pellets, flakes, granules, and as a 50% saturated solution. It is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.
[8] Energy stored in a coal is -
A.
kinetic energy
B.
potential energy
C.
chemical energy
D.
nuclear energy
Ans:
chemical energy
Explanation :
Chemical energy is stored in coal. Coal is a Hydrocarbon. When coal is burnt its chemical energy comes out in the form of light and heat energy which result in formation of vapors of Carbon Dioxide (CO2) and water (H2O).
[9] Which of the following is the most common element in the Universe?
A.
Nitrogen
B.
Oxygen
C.
Hydrogen
D.
Carbon
Ans:
Hydrogen
Explanation :
The most abundant element in the universe is hydrogen, which makes up about 3/4 of all matter! Helium makes up most of the remaining 25%. Oxygen is the third most abundant element in the universe. All of the other elements are relatively rare.
[10] Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are -
A.
Boron and Cadmium
B.
Boron and Plutonium
C.
Cadmium and Uranium
D.
Uranium and Boron
Ans:
Boron and Cadmium
Explanation :
Since the continued chain reaction of a nuclear fission reactor depends upon at least one neutron from each fission being absorbed by another fissionable nucleus, the reaction can be controlled by using control rods of material which absorbs neutrons. Cadmium and boron are strong neutron absorbers and are the most common materials used in control rods. In the operation of a nuclear reactor, fuel assemblies are put into place and then the control rods are slowly lifted until a chain reaction can just be sustained.
[11] The most commonly used chemicals in the artificial rainmaking or cloud seeding are –
A.
Silver Iodide (AgI)
B.
Sodium Chloride (NaCl)
C.
Dry Ice (Frozen CO2)
D.
All of the above
Ans:
Silver Iodide (AgI)
Explanation :
Cloud seeding, a form of intentional weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports. The most common chemicals used for cloud seeding include silver iodide and dry ice (solid carbon dioxide).
[12] Which of the following is not a greenhouse gas?
A.
Hydrogen
B.
Carbon dioxide
C.
Nitric oxide
D.
Chlorofluorocarbon
Ans:
Hydrogen
Explanation :
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. In the Solar System, the atmospheres of Venus, Mars, and Titan also contain gases that cause greenhouse effects.
[13] Wax used for making candle is chemically a mixture of –
A.
aliphatic hydrocarbons
B.
aromatic hydrocarbons
C.
cyclic hydrocarbons
D.
aliphatic and aromatic hydrocarbons
Ans:
aliphatic hydrocarbons
Explanation :
An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.
[14] The gas used in the artificial ripening of fruits is –
A.
Acetylene
B.
Methane
C.
Ethane
D.
Butane
Ans:
Acetylene
Explanation :
Ripening is a process in fruits that causes them to become more palatable. In general, a fruit becomes sweeter, less green, and softer as it ripens. Even though the acidity of fruit increases as it ripens, the higher acidity level does not make the fruit seem tarter, which can lead to the misunderstanding that the riper the fruit the sweeter. Ripening agents speed up the ripening process. They allow many fruits to be picked prior to full ripening, which is useful, since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being gassed with ethylene. Calcium carbide is also used for ripening fruit artificially in some countries. Calcium carbide reacts with water to produce acetylene, which acts as an artificial ripening agent. Industrial-grade calcium carbide may contain traces of arsenic and phosphorus which makes it a human health concern. The use of this chemical for this purpose is illegal in most countries.
[15] Ruby and sapphire are oxides of –
A.
copper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
Sodium hydroxide, also known as lye or caustic soda, has the molecular formula NaOH and is a highly caustic metallic base. It is a white solid available in pellets, flakes, granules, and as a 50% saturated solution. It is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.
[8] Energy stored in a coal is -
A.
kinetic energy
B.
potential energy
C.
chemical energy
D.
nuclear energy
Ans:
chemical energy
Explanation :
Chemical energy is stored in coal. Coal is a Hydrocarbon. When coal is burnt its chemical energy comes out in the form of light and heat energy which result in formation of vapors of Carbon Dioxide (CO2) and water (H2O).
[9] Which of the following is the most common element in the Universe?
A.
Nitrogen
B.
Oxygen
C.
Hydrogen
D.
Carbon
Ans:
Hydrogen
Explanation :
The most abundant element in the universe is hydrogen, which makes up about 3/4 of all matter! Helium makes up most of the remaining 25%. Oxygen is the third most abundant element in the universe. All of the other elements are relatively rare.
[10] Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are -
A.
Boron and Cadmium
B.
Boron and Plutonium
C.
Cadmium and Uranium
D.
Uranium and Boron
Ans:
Boron and Cadmium
Explanation :
Since the continued chain reaction of a nuclear fission reactor depends upon at least one neutron from each fission being absorbed by another fissionable nucleus, the reaction can be controlled by using control rods of material which absorbs neutrons. Cadmium and boron are strong neutron absorbers and are the most common materials used in control rods. In the operation of a nuclear reactor, fuel assemblies are put into place and then the control rods are slowly lifted until a chain reaction can just be sustained.
[11] The most commonly used chemicals in the artificial rainmaking or cloud seeding are –
A.
Silver Iodide (AgI)
B.
Sodium Chloride (NaCl)
C.
Dry Ice (Frozen CO2)
D.
All of the above
Ans:
Silver Iodide (AgI)
Explanation :
Cloud seeding, a form of intentional weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports. The most common chemicals used for cloud seeding include silver iodide and dry ice (solid carbon dioxide).
[12] Which of the following is not a greenhouse gas?
A.
Hydrogen
B.
Carbon dioxide
C.
Nitric oxide
D.
Chlorofluorocarbon
Ans:
Hydrogen
Explanation :
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. In the Solar System, the atmospheres of Venus, Mars, and Titan also contain gases that cause greenhouse effects.
[13] Wax used for making candle is chemically a mixture of –
A.
aliphatic hydrocarbons
B.
aromatic hydrocarbons
C.
cyclic hydrocarbons
D.
aliphatic and aromatic hydrocarbons
Ans:
aliphatic hydrocarbons
Explanation :
An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.
[14] The gas used in the artificial ripening of fruits is –
A.
Acetylene
B.
Methane
C.
Ethane
D.
Butane
Ans:
Acetylene
Explanation :
Ripening is a process in fruits that causes them to become more palatable. In general, a fruit becomes sweeter, less green, and softer as it ripens. Even though the acidity of fruit increases as it ripens, the higher acidity level does not make the fruit seem tarter, which can lead to the misunderstanding that the riper the fruit the sweeter. Ripening agents speed up the ripening process. They allow many fruits to be picked prior to full ripening, which is useful, since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being gassed with ethylene. Calcium carbide is also used for ripening fruit artificially in some countries. Calcium carbide reacts with water to produce acetylene, which acts as an artificial ripening agent. Industrial-grade calcium carbide may contain traces of arsenic and phosphorus which makes it a human health concern. The use of this chemical for this purpose is illegal in most countries.
[15] Ruby and sapphire are oxides of –
A.
copper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
The most abundant element in the universe is hydrogen, which makes up about 3/4 of all matter! Helium makes up most of the remaining 25%. Oxygen is the third most abundant element in the universe. All of the other elements are relatively rare.
[10] Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are -
A.
Boron and Cadmium
B.
Boron and Plutonium
C.
Cadmium and Uranium
D.
Uranium and Boron
Ans:
Boron and Cadmium
Explanation :
Since the continued chain reaction of a nuclear fission reactor depends upon at least one neutron from each fission being absorbed by another fissionable nucleus, the reaction can be controlled by using control rods of material which absorbs neutrons. Cadmium and boron are strong neutron absorbers and are the most common materials used in control rods. In the operation of a nuclear reactor, fuel assemblies are put into place and then the control rods are slowly lifted until a chain reaction can just be sustained.
[11] The most commonly used chemicals in the artificial rainmaking or cloud seeding are –
A.
Silver Iodide (AgI)
B.
Sodium Chloride (NaCl)
C.
Dry Ice (Frozen CO2)
D.
All of the above
Ans:
Silver Iodide (AgI)
Explanation :
Cloud seeding, a form of intentional weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports. The most common chemicals used for cloud seeding include silver iodide and dry ice (solid carbon dioxide).
[12] Which of the following is not a greenhouse gas?
A.
Hydrogen
B.
Carbon dioxide
C.
Nitric oxide
D.
Chlorofluorocarbon
Ans:
Hydrogen
Explanation :
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. In the Solar System, the atmospheres of Venus, Mars, and Titan also contain gases that cause greenhouse effects.
[13] Wax used for making candle is chemically a mixture of –
A.
aliphatic hydrocarbons
B.
aromatic hydrocarbons
C.
cyclic hydrocarbons
D.
aliphatic and aromatic hydrocarbons
Ans:
aliphatic hydrocarbons
Explanation :
An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.
[14] The gas used in the artificial ripening of fruits is –
A.
Acetylene
B.
Methane
C.
Ethane
D.
Butane
Ans:
Acetylene
Explanation :
Ripening is a process in fruits that causes them to become more palatable. In general, a fruit becomes sweeter, less green, and softer as it ripens. Even though the acidity of fruit increases as it ripens, the higher acidity level does not make the fruit seem tarter, which can lead to the misunderstanding that the riper the fruit the sweeter. Ripening agents speed up the ripening process. They allow many fruits to be picked prior to full ripening, which is useful, since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being gassed with ethylene. Calcium carbide is also used for ripening fruit artificially in some countries. Calcium carbide reacts with water to produce acetylene, which acts as an artificial ripening agent. Industrial-grade calcium carbide may contain traces of arsenic and phosphorus which makes it a human health concern. The use of this chemical for this purpose is illegal in most countries.
[15] Ruby and sapphire are oxides of –
A.
copper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
Cloud seeding, a form of intentional weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports. The most common chemicals used for cloud seeding include silver iodide and dry ice (solid carbon dioxide).
[12] Which of the following is not a greenhouse gas?
A.
Hydrogen
B.
Carbon dioxide
C.
Nitric oxide
D.
Chlorofluorocarbon
Ans:
Hydrogen
Explanation :
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. In the Solar System, the atmospheres of Venus, Mars, and Titan also contain gases that cause greenhouse effects.
[13] Wax used for making candle is chemically a mixture of –
A.
aliphatic hydrocarbons
B.
aromatic hydrocarbons
C.
cyclic hydrocarbons
D.
aliphatic and aromatic hydrocarbons
Ans:
aliphatic hydrocarbons
Explanation :
An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.
[14] The gas used in the artificial ripening of fruits is –
A.
Acetylene
B.
Methane
C.
Ethane
D.
Butane
Ans:
Acetylene
Explanation :
Ripening is a process in fruits that causes them to become more palatable. In general, a fruit becomes sweeter, less green, and softer as it ripens. Even though the acidity of fruit increases as it ripens, the higher acidity level does not make the fruit seem tarter, which can lead to the misunderstanding that the riper the fruit the sweeter. Ripening agents speed up the ripening process. They allow many fruits to be picked prior to full ripening, which is useful, since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being gassed with ethylene. Calcium carbide is also used for ripening fruit artificially in some countries. Calcium carbide reacts with water to produce acetylene, which acts as an artificial ripening agent. Industrial-grade calcium carbide may contain traces of arsenic and phosphorus which makes it a human health concern. The use of this chemical for this purpose is illegal in most countries.
[15] Ruby and sapphire are oxides of –
A.
copper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.
[14] The gas used in the artificial ripening of fruits is –
A.
Acetylene
B.
Methane
C.
Ethane
D.
Butane
Ans:
Acetylene
Explanation :
Ripening is a process in fruits that causes them to become more palatable. In general, a fruit becomes sweeter, less green, and softer as it ripens. Even though the acidity of fruit increases as it ripens, the higher acidity level does not make the fruit seem tarter, which can lead to the misunderstanding that the riper the fruit the sweeter. Ripening agents speed up the ripening process. They allow many fruits to be picked prior to full ripening, which is useful, since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being gassed with ethylene. Calcium carbide is also used for ripening fruit artificially in some countries. Calcium carbide reacts with water to produce acetylene, which acts as an artificial ripening agent. Industrial-grade calcium carbide may contain traces of arsenic and phosphorus which makes it a human health concern. The use of this chemical for this purpose is illegal in most countries.
[15] Ruby and sapphire are oxides of –
A.
copper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.
[16] Preparation of `Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
A.
Hydrolysis
B.
Qxidation
C.
Hydrogenation
D.
Ozonolysis
Ans:
Hydrogenation
Explanation :
The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[17] Smoke is formed due to –
A.
Solid dispersed in gas
B.
Solid dispersed in liquid
C.
gas dispersed in solid
D.
gas dispersed in gas
Ans:
Solid dispersed in gas
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.).
[18] Type metal used in printing press is an alloy of –
A.
lead and copper
B.
lead and antimony
C.
lead and bismuth
D.
lead and zinc
Ans:
lead and antimony
Explanation :
In printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional type founding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy. Cheap, plentifully available as galena and easily workable, lead has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
[19] Sour taste of 'Coca Cola' is due to the presence of –
A.
acetic acid
B.
phosphoric acid
C.
hydrochloric acid
D.
formic acid
Ans:
phosphoric acid
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from citrus, but usually fermented by Aspergillusniger mold from scrap molasses, waste starch hydrolysates and phosphoric acid.
[20] Which of the following is used in making smoke bombs?
A.
Sulphur
B.
Phosphorus
C.
Hydrogen
D.
Carbon
Ans:
Carbon
Explanation :
A smoke bomb is a firework designed to produce smoke upon ignition. Smoke bombs are useful to military units, airsoft games, paintball games, selfdefense and pranks. The smoke bomb was first created in 1848, by the inventor Robert Yale. He developed 17th century Chinese-style fireworks and later modified the formula to produce more smoke for a longer period of time. Coloured smoke devices use a formula that consists of an oxidizer (typically potassium chlorate, KClO3), a fuel (generally sugar), a moderant (such as sodium bicarbonate) to keep the reaction from getting too hot, and a powdered organic dye. The burning of this mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a “smoke” of finely dispersed particles. A smoke ball is a hollow, cherry-sized sphere of brightly coloured clay or cardboard filled with a smoke-generating composition that produces a forceful jet of coloured smoke for 10 to 15 seconds.
[21] German silver is an alloy of –
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
zinc, silver and copper
Ans:
zinc, copper and nickel
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[22] Acids turn blue litmus into which color?
A.
Green
B.
Red
C.
Pink
D.
Colourless
Ans:
Red
Explanation :
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
[23] Haemoglobin is used to transport in humans.
A.
Oxygen
B.
Carbon Dioxide
C.
Both are correct
D.
Both are incorrect
Ans:
Oxygen
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
In human beings, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. This pigment is present in the red blood corpuscles.
[24] Commercial nitric acid is coloured because it contains dissolved –
A.
Oxygen
B.
Nitrous oxide
C.
Nitrogen dioxide
D.
Coloured impurities
Ans:
Nitrogen dioxide
Explanation :
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
[25] Fertiliser having high nitrogen content is –
A.
Urea
B.
Ammonium sulphate
C.
Ammonium nitrate
D.
Calcium citrate
Ans:
Ammonium nitrate
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.
Explanation :
A growth fertilizer will have a high N content and relatively low P and K content. Ammonium nitrate is the highest Nitrogen fertilizer you can buy, and it is potent stuff. It is usually rated as 33-0-0 or 34-0-0. The bag contains 33% or 34% Nitrogen and the other 66% or 67% is inert material. Other formulations of growth fertilizers will contain 5, 6 or even 7 times more Nitrogen than anything else.