[1] Which among the following is used in making liquors, medicines and as a fuel in aircrafts?
A.
Propyl alcohol
B.
Dimethyl alcohol
C.
Ethyl alcohol
D.
Methyl alcohol
Ans:
Ethyl alcohol
Explanation :
Ethyl alcohol (C2H5), also known as ethanol, is a member of a class of organic compounds that are given the general name alcohols.
[2] The nuclear particles which are assumed to hold the nucleons together are -
A.
positrons
B.
neutrons
C.
electrons
D.
mesons
Ans:
mesons
Explanation :
The nuclear particles which are assumed to hold the nucleons together are mesons.
[3] Milk of magnesia is a suspension of –
A.
magnesium sulphate
B.
magnesium carbonate
C.
magnesium hydroxide
D.
magnesium Chloride
Ans:
magnesium hydroxide
Explanation :
Magnesium hydroxide is an inorganic compound with the chemical formula Mg(OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite. Magnesium hydroxide is a common component of antacids and laxatives; it interferes with the absorption of folic acid and iron. Magnesium hydroxide has low solubility in water, with a Ksp of 1.5×10–11; however all of the magnesium hydroxide that does dissolve dissociates.
[4] Which of the following cannot be beaten into Sheets?
A.
Gold
B.
Silver
C.
Potassium
D.
Aluminium
Ans:
Potassium
Explanation :
The property of metals by which they can be beaten into thin sheets is called malleability. Most metals are malleable. Gold, aluminium and silver are the best malleable metals and can be hammered into very fine sheets or foils.
[5] Minamata disease is a nervous disorder caused by eating fish, polluted with .
A.
Iron
B.
Lead
C.
Mercury
D.
Nickel
Ans:
Mercury
Explanation :
Minamata disease is a neurological syndrome caused by severe mercury poisoning Symptoms include ataxia numbness in the hands and feet, general muscle weakness narrowing of the field of vision and damage to hearing and speech.
[6] Which of the following is used to denature ethanol?
A.
Methyl alcohol
B.
Propyl alcohol
C.
Phenol
D.
Methane
Ans:
Methyl alcohol
Explanation :
Denatured alcohol is ethanol that has additives to make it undrinkable (poisonous), to discourage recreational consumption. Different additives are used to make it difficult. to use distillation or other simple processes to reverse the denaturation. Methanol is commonly used both because its boiling point is close to that of ethanol and because it is toxic.
[7] The charcoal used to decolorize brown sugar solution is -
A.
Wood charcoal
B.
Coconut charcoal
C.
Animal charcoal
D.
Sugar charcoal
Ans:
Animal charcoal
Explanation :
A special characteristic of animal charcoal is its power to remove substances from solution. A brown solution of raw sugar is decolourized when boiled with animal charcoal. Other substances that are similarly removed from solution are indigo, litmus, iodine, the colouring-matter of red wine, the brown matter of peaty water or sewage, astringent principles, and certain basic salts, etc.
[8] Which one of the following is used as a sowing agent in the preparation of soft drinks?
A.
Phosphoric acid
B.
Phosphorus acid
C.
Salicylic acid
D.
Boric acid
Ans:
Phosphoric acid
Explanation :
Phosphoric acid was the foundation of the soft-drink industry, long before Coca-Cola's popularity. Phosphoric acid is deliberately added to soft drinks to give them a sharper flavor. It also slows the growth of molds and bacteria, which would otherwise multiply.
[9] The coating of a thin layer of zinc on steel or iron objects is known as –
A.
Hot dipping
B.
Tinning
C.
Galvanising
D.
Electroplating
Ans:
Galvanising
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. Although galvanization can be done with electrochemical and electro-deposition processes, the most common method in current use is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc.
[10] Which of the following produces highest amount of energy upon oxidation?
A.
Protein
B.
Fat
C.
Glucose
D.
An alkane
Ans:
Fat
Explanation :
Fats consist of a wide group of compounds that are generally soluble in organic solvents and generally insoluble in water. Chemically, fats are triglycerides, triesters of glycerol and any of several fatty acids. Fats may be either solid or liquid at room temperature, depending on their structure and composition. Although the words "oils", "fats", and "lipids" are all used to refer to fats, "oils" is usually used to refer to fats that are liquids at normal room temperature, while "fats" is usually used to refer to fats that are solids at normal room temperature.
[11] Which of the following substance is highly plastic?
A.
Quartz
B.
Mica
C.
Granite
D.
Clay
Ans:
Clay
Explanation :
Clays exhibit plasticity when mixed with water in certain proportions. When dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes occur. These reactions, among other changes, cause the clay to be converted into a ceramic material. Because of these properties, clay is used for making pottery items, both utilitarian and decorative. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain.
[12] The National Chemical Laboratory (India) is located in –
A.
Mumbai
B.
Bangaluru
C.
Hyderabad
D.
Pune
Ans:
Pune
Explanation :
NCL, India is a research, development and consulting organization with a focus on chemistry and chemical engineering. It has a successful record of research partnership with industry and is located in pune. NCL belongs to the family of Council of Scientific and Industrial Research (CSIR), the largest chain of public funded research organization in world. NCL's human resources comprise of over 1000 people of whom 350 are scientist, 110 are technical staff with advanced degrees in science, technology or engineering.
[13] The major constituent of gobar gas is –
A.
Carbon dioxide
B.
Methane
C.
Butane
D.
Isobutane
Ans:
Methane
Explanation :
lobar Gas (Methane) is generated by the decomposition of organic cow dung. It consists of 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. The composition of biogas varies depending upon the origin of the anaerobic digestion process. Landfill gas typically has methane concentrations around 50%.
[14] The residue left after extracting juice from sugar beet and sugarcane is called –
A.
molasses
B.
bagasse
C.
whey
D.
biomass
Ans:
bagasse
Explanation :
Bagasse is the fibrous matter that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is currently used as a biofuel and in the manufacture of pulp and paper products and building materials. Agave bagasse is a similar material that consists of the, tissue of the blue agave after extraction of the sap. For each 10 tonnes of sugarcane crushed, a sugar factory produces nearly 3 tonnes of wet bagasse. Since bagasse is a by-product of the cane sugar industry, the quantity of production in each country is in line with the quantity of sugarcane produced.
[15] Indane gas is a mixture of which gases?
A.
butane and hydrogen
B.
butane and propane
C.
butane and oxygen
D.
methane and oxygen
Ans:
butane and propane
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Ethyl alcohol (C2H5), also known as ethanol, is a member of a class of organic compounds that are given the general name alcohols.
[2] The nuclear particles which are assumed to hold the nucleons together are -
A.
positrons
B.
neutrons
C.
electrons
D.
mesons
Ans:
mesons
Explanation :
The nuclear particles which are assumed to hold the nucleons together are mesons.
[3] Milk of magnesia is a suspension of –
A.
magnesium sulphate
B.
magnesium carbonate
C.
magnesium hydroxide
D.
magnesium Chloride
Ans:
magnesium hydroxide
Explanation :
Magnesium hydroxide is an inorganic compound with the chemical formula Mg(OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite. Magnesium hydroxide is a common component of antacids and laxatives; it interferes with the absorption of folic acid and iron. Magnesium hydroxide has low solubility in water, with a Ksp of 1.5×10–11; however all of the magnesium hydroxide that does dissolve dissociates.
[4] Which of the following cannot be beaten into Sheets?
A.
Gold
B.
Silver
C.
Potassium
D.
Aluminium
Ans:
Potassium
Explanation :
The property of metals by which they can be beaten into thin sheets is called malleability. Most metals are malleable. Gold, aluminium and silver are the best malleable metals and can be hammered into very fine sheets or foils.
[5] Minamata disease is a nervous disorder caused by eating fish, polluted with .
A.
Iron
B.
Lead
C.
Mercury
D.
Nickel
Ans:
Mercury
Explanation :
Minamata disease is a neurological syndrome caused by severe mercury poisoning Symptoms include ataxia numbness in the hands and feet, general muscle weakness narrowing of the field of vision and damage to hearing and speech.
[6] Which of the following is used to denature ethanol?
A.
Methyl alcohol
B.
Propyl alcohol
C.
Phenol
D.
Methane
Ans:
Methyl alcohol
Explanation :
Denatured alcohol is ethanol that has additives to make it undrinkable (poisonous), to discourage recreational consumption. Different additives are used to make it difficult. to use distillation or other simple processes to reverse the denaturation. Methanol is commonly used both because its boiling point is close to that of ethanol and because it is toxic.
[7] The charcoal used to decolorize brown sugar solution is -
A.
Wood charcoal
B.
Coconut charcoal
C.
Animal charcoal
D.
Sugar charcoal
Ans:
Animal charcoal
Explanation :
A special characteristic of animal charcoal is its power to remove substances from solution. A brown solution of raw sugar is decolourized when boiled with animal charcoal. Other substances that are similarly removed from solution are indigo, litmus, iodine, the colouring-matter of red wine, the brown matter of peaty water or sewage, astringent principles, and certain basic salts, etc.
[8] Which one of the following is used as a sowing agent in the preparation of soft drinks?
A.
Phosphoric acid
B.
Phosphorus acid
C.
Salicylic acid
D.
Boric acid
Ans:
Phosphoric acid
Explanation :
Phosphoric acid was the foundation of the soft-drink industry, long before Coca-Cola's popularity. Phosphoric acid is deliberately added to soft drinks to give them a sharper flavor. It also slows the growth of molds and bacteria, which would otherwise multiply.
[9] The coating of a thin layer of zinc on steel or iron objects is known as –
A.
Hot dipping
B.
Tinning
C.
Galvanising
D.
Electroplating
Ans:
Galvanising
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. Although galvanization can be done with electrochemical and electro-deposition processes, the most common method in current use is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc.
[10] Which of the following produces highest amount of energy upon oxidation?
A.
Protein
B.
Fat
C.
Glucose
D.
An alkane
Ans:
Fat
Explanation :
Fats consist of a wide group of compounds that are generally soluble in organic solvents and generally insoluble in water. Chemically, fats are triglycerides, triesters of glycerol and any of several fatty acids. Fats may be either solid or liquid at room temperature, depending on their structure and composition. Although the words "oils", "fats", and "lipids" are all used to refer to fats, "oils" is usually used to refer to fats that are liquids at normal room temperature, while "fats" is usually used to refer to fats that are solids at normal room temperature.
[11] Which of the following substance is highly plastic?
A.
Quartz
B.
Mica
C.
Granite
D.
Clay
Ans:
Clay
Explanation :
Clays exhibit plasticity when mixed with water in certain proportions. When dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes occur. These reactions, among other changes, cause the clay to be converted into a ceramic material. Because of these properties, clay is used for making pottery items, both utilitarian and decorative. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain.
[12] The National Chemical Laboratory (India) is located in –
A.
Mumbai
B.
Bangaluru
C.
Hyderabad
D.
Pune
Ans:
Pune
Explanation :
NCL, India is a research, development and consulting organization with a focus on chemistry and chemical engineering. It has a successful record of research partnership with industry and is located in pune. NCL belongs to the family of Council of Scientific and Industrial Research (CSIR), the largest chain of public funded research organization in world. NCL's human resources comprise of over 1000 people of whom 350 are scientist, 110 are technical staff with advanced degrees in science, technology or engineering.
[13] The major constituent of gobar gas is –
A.
Carbon dioxide
B.
Methane
C.
Butane
D.
Isobutane
Ans:
Methane
Explanation :
lobar Gas (Methane) is generated by the decomposition of organic cow dung. It consists of 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. The composition of biogas varies depending upon the origin of the anaerobic digestion process. Landfill gas typically has methane concentrations around 50%.
[14] The residue left after extracting juice from sugar beet and sugarcane is called –
A.
molasses
B.
bagasse
C.
whey
D.
biomass
Ans:
bagasse
Explanation :
Bagasse is the fibrous matter that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is currently used as a biofuel and in the manufacture of pulp and paper products and building materials. Agave bagasse is a similar material that consists of the, tissue of the blue agave after extraction of the sap. For each 10 tonnes of sugarcane crushed, a sugar factory produces nearly 3 tonnes of wet bagasse. Since bagasse is a by-product of the cane sugar industry, the quantity of production in each country is in line with the quantity of sugarcane produced.
[15] Indane gas is a mixture of which gases?
A.
butane and hydrogen
B.
butane and propane
C.
butane and oxygen
D.
methane and oxygen
Ans:
butane and propane
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Magnesium hydroxide is an inorganic compound with the chemical formula Mg(OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite. Magnesium hydroxide is a common component of antacids and laxatives; it interferes with the absorption of folic acid and iron. Magnesium hydroxide has low solubility in water, with a Ksp of 1.5×10–11; however all of the magnesium hydroxide that does dissolve dissociates.
[4] Which of the following cannot be beaten into Sheets?
A.
Gold
B.
Silver
C.
Potassium
D.
Aluminium
Ans:
Potassium
Explanation :
The property of metals by which they can be beaten into thin sheets is called malleability. Most metals are malleable. Gold, aluminium and silver are the best malleable metals and can be hammered into very fine sheets or foils.
[5] Minamata disease is a nervous disorder caused by eating fish, polluted with .
A.
Iron
B.
Lead
C.
Mercury
D.
Nickel
Ans:
Mercury
Explanation :
Minamata disease is a neurological syndrome caused by severe mercury poisoning Symptoms include ataxia numbness in the hands and feet, general muscle weakness narrowing of the field of vision and damage to hearing and speech.
[6] Which of the following is used to denature ethanol?
A.
Methyl alcohol
B.
Propyl alcohol
C.
Phenol
D.
Methane
Ans:
Methyl alcohol
Explanation :
Denatured alcohol is ethanol that has additives to make it undrinkable (poisonous), to discourage recreational consumption. Different additives are used to make it difficult. to use distillation or other simple processes to reverse the denaturation. Methanol is commonly used both because its boiling point is close to that of ethanol and because it is toxic.
[7] The charcoal used to decolorize brown sugar solution is -
A.
Wood charcoal
B.
Coconut charcoal
C.
Animal charcoal
D.
Sugar charcoal
Ans:
Animal charcoal
Explanation :
A special characteristic of animal charcoal is its power to remove substances from solution. A brown solution of raw sugar is decolourized when boiled with animal charcoal. Other substances that are similarly removed from solution are indigo, litmus, iodine, the colouring-matter of red wine, the brown matter of peaty water or sewage, astringent principles, and certain basic salts, etc.
[8] Which one of the following is used as a sowing agent in the preparation of soft drinks?
A.
Phosphoric acid
B.
Phosphorus acid
C.
Salicylic acid
D.
Boric acid
Ans:
Phosphoric acid
Explanation :
Phosphoric acid was the foundation of the soft-drink industry, long before Coca-Cola's popularity. Phosphoric acid is deliberately added to soft drinks to give them a sharper flavor. It also slows the growth of molds and bacteria, which would otherwise multiply.
[9] The coating of a thin layer of zinc on steel or iron objects is known as –
A.
Hot dipping
B.
Tinning
C.
Galvanising
D.
Electroplating
Ans:
Galvanising
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. Although galvanization can be done with electrochemical and electro-deposition processes, the most common method in current use is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc.
[10] Which of the following produces highest amount of energy upon oxidation?
A.
Protein
B.
Fat
C.
Glucose
D.
An alkane
Ans:
Fat
Explanation :
Fats consist of a wide group of compounds that are generally soluble in organic solvents and generally insoluble in water. Chemically, fats are triglycerides, triesters of glycerol and any of several fatty acids. Fats may be either solid or liquid at room temperature, depending on their structure and composition. Although the words "oils", "fats", and "lipids" are all used to refer to fats, "oils" is usually used to refer to fats that are liquids at normal room temperature, while "fats" is usually used to refer to fats that are solids at normal room temperature.
[11] Which of the following substance is highly plastic?
A.
Quartz
B.
Mica
C.
Granite
D.
Clay
Ans:
Clay
Explanation :
Clays exhibit plasticity when mixed with water in certain proportions. When dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes occur. These reactions, among other changes, cause the clay to be converted into a ceramic material. Because of these properties, clay is used for making pottery items, both utilitarian and decorative. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain.
[12] The National Chemical Laboratory (India) is located in –
A.
Mumbai
B.
Bangaluru
C.
Hyderabad
D.
Pune
Ans:
Pune
Explanation :
NCL, India is a research, development and consulting organization with a focus on chemistry and chemical engineering. It has a successful record of research partnership with industry and is located in pune. NCL belongs to the family of Council of Scientific and Industrial Research (CSIR), the largest chain of public funded research organization in world. NCL's human resources comprise of over 1000 people of whom 350 are scientist, 110 are technical staff with advanced degrees in science, technology or engineering.
[13] The major constituent of gobar gas is –
A.
Carbon dioxide
B.
Methane
C.
Butane
D.
Isobutane
Ans:
Methane
Explanation :
lobar Gas (Methane) is generated by the decomposition of organic cow dung. It consists of 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. The composition of biogas varies depending upon the origin of the anaerobic digestion process. Landfill gas typically has methane concentrations around 50%.
[14] The residue left after extracting juice from sugar beet and sugarcane is called –
A.
molasses
B.
bagasse
C.
whey
D.
biomass
Ans:
bagasse
Explanation :
Bagasse is the fibrous matter that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is currently used as a biofuel and in the manufacture of pulp and paper products and building materials. Agave bagasse is a similar material that consists of the, tissue of the blue agave after extraction of the sap. For each 10 tonnes of sugarcane crushed, a sugar factory produces nearly 3 tonnes of wet bagasse. Since bagasse is a by-product of the cane sugar industry, the quantity of production in each country is in line with the quantity of sugarcane produced.
[15] Indane gas is a mixture of which gases?
A.
butane and hydrogen
B.
butane and propane
C.
butane and oxygen
D.
methane and oxygen
Ans:
butane and propane
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Minamata disease is a neurological syndrome caused by severe mercury poisoning Symptoms include ataxia numbness in the hands and feet, general muscle weakness narrowing of the field of vision and damage to hearing and speech.
[6] Which of the following is used to denature ethanol?
A.
Methyl alcohol
B.
Propyl alcohol
C.
Phenol
D.
Methane
Ans:
Methyl alcohol
Explanation :
Denatured alcohol is ethanol that has additives to make it undrinkable (poisonous), to discourage recreational consumption. Different additives are used to make it difficult. to use distillation or other simple processes to reverse the denaturation. Methanol is commonly used both because its boiling point is close to that of ethanol and because it is toxic.
[7] The charcoal used to decolorize brown sugar solution is -
A.
Wood charcoal
B.
Coconut charcoal
C.
Animal charcoal
D.
Sugar charcoal
Ans:
Animal charcoal
Explanation :
A special characteristic of animal charcoal is its power to remove substances from solution. A brown solution of raw sugar is decolourized when boiled with animal charcoal. Other substances that are similarly removed from solution are indigo, litmus, iodine, the colouring-matter of red wine, the brown matter of peaty water or sewage, astringent principles, and certain basic salts, etc.
[8] Which one of the following is used as a sowing agent in the preparation of soft drinks?
A.
Phosphoric acid
B.
Phosphorus acid
C.
Salicylic acid
D.
Boric acid
Ans:
Phosphoric acid
Explanation :
Phosphoric acid was the foundation of the soft-drink industry, long before Coca-Cola's popularity. Phosphoric acid is deliberately added to soft drinks to give them a sharper flavor. It also slows the growth of molds and bacteria, which would otherwise multiply.
[9] The coating of a thin layer of zinc on steel or iron objects is known as –
A.
Hot dipping
B.
Tinning
C.
Galvanising
D.
Electroplating
Ans:
Galvanising
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. Although galvanization can be done with electrochemical and electro-deposition processes, the most common method in current use is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc.
[10] Which of the following produces highest amount of energy upon oxidation?
A.
Protein
B.
Fat
C.
Glucose
D.
An alkane
Ans:
Fat
Explanation :
Fats consist of a wide group of compounds that are generally soluble in organic solvents and generally insoluble in water. Chemically, fats are triglycerides, triesters of glycerol and any of several fatty acids. Fats may be either solid or liquid at room temperature, depending on their structure and composition. Although the words "oils", "fats", and "lipids" are all used to refer to fats, "oils" is usually used to refer to fats that are liquids at normal room temperature, while "fats" is usually used to refer to fats that are solids at normal room temperature.
[11] Which of the following substance is highly plastic?
A.
Quartz
B.
Mica
C.
Granite
D.
Clay
Ans:
Clay
Explanation :
Clays exhibit plasticity when mixed with water in certain proportions. When dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes occur. These reactions, among other changes, cause the clay to be converted into a ceramic material. Because of these properties, clay is used for making pottery items, both utilitarian and decorative. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain.
[12] The National Chemical Laboratory (India) is located in –
A.
Mumbai
B.
Bangaluru
C.
Hyderabad
D.
Pune
Ans:
Pune
Explanation :
NCL, India is a research, development and consulting organization with a focus on chemistry and chemical engineering. It has a successful record of research partnership with industry and is located in pune. NCL belongs to the family of Council of Scientific and Industrial Research (CSIR), the largest chain of public funded research organization in world. NCL's human resources comprise of over 1000 people of whom 350 are scientist, 110 are technical staff with advanced degrees in science, technology or engineering.
[13] The major constituent of gobar gas is –
A.
Carbon dioxide
B.
Methane
C.
Butane
D.
Isobutane
Ans:
Methane
Explanation :
lobar Gas (Methane) is generated by the decomposition of organic cow dung. It consists of 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. The composition of biogas varies depending upon the origin of the anaerobic digestion process. Landfill gas typically has methane concentrations around 50%.
[14] The residue left after extracting juice from sugar beet and sugarcane is called –
A.
molasses
B.
bagasse
C.
whey
D.
biomass
Ans:
bagasse
Explanation :
Bagasse is the fibrous matter that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is currently used as a biofuel and in the manufacture of pulp and paper products and building materials. Agave bagasse is a similar material that consists of the, tissue of the blue agave after extraction of the sap. For each 10 tonnes of sugarcane crushed, a sugar factory produces nearly 3 tonnes of wet bagasse. Since bagasse is a by-product of the cane sugar industry, the quantity of production in each country is in line with the quantity of sugarcane produced.
[15] Indane gas is a mixture of which gases?
A.
butane and hydrogen
B.
butane and propane
C.
butane and oxygen
D.
methane and oxygen
Ans:
butane and propane
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
A special characteristic of animal charcoal is its power to remove substances from solution. A brown solution of raw sugar is decolourized when boiled with animal charcoal. Other substances that are similarly removed from solution are indigo, litmus, iodine, the colouring-matter of red wine, the brown matter of peaty water or sewage, astringent principles, and certain basic salts, etc.
[8] Which one of the following is used as a sowing agent in the preparation of soft drinks?
A.
Phosphoric acid
B.
Phosphorus acid
C.
Salicylic acid
D.
Boric acid
Ans:
Phosphoric acid
Explanation :
Phosphoric acid was the foundation of the soft-drink industry, long before Coca-Cola's popularity. Phosphoric acid is deliberately added to soft drinks to give them a sharper flavor. It also slows the growth of molds and bacteria, which would otherwise multiply.
[9] The coating of a thin layer of zinc on steel or iron objects is known as –
A.
Hot dipping
B.
Tinning
C.
Galvanising
D.
Electroplating
Ans:
Galvanising
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. Although galvanization can be done with electrochemical and electro-deposition processes, the most common method in current use is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc.
[10] Which of the following produces highest amount of energy upon oxidation?
A.
Protein
B.
Fat
C.
Glucose
D.
An alkane
Ans:
Fat
Explanation :
Fats consist of a wide group of compounds that are generally soluble in organic solvents and generally insoluble in water. Chemically, fats are triglycerides, triesters of glycerol and any of several fatty acids. Fats may be either solid or liquid at room temperature, depending on their structure and composition. Although the words "oils", "fats", and "lipids" are all used to refer to fats, "oils" is usually used to refer to fats that are liquids at normal room temperature, while "fats" is usually used to refer to fats that are solids at normal room temperature.
[11] Which of the following substance is highly plastic?
A.
Quartz
B.
Mica
C.
Granite
D.
Clay
Ans:
Clay
Explanation :
Clays exhibit plasticity when mixed with water in certain proportions. When dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes occur. These reactions, among other changes, cause the clay to be converted into a ceramic material. Because of these properties, clay is used for making pottery items, both utilitarian and decorative. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain.
[12] The National Chemical Laboratory (India) is located in –
A.
Mumbai
B.
Bangaluru
C.
Hyderabad
D.
Pune
Ans:
Pune
Explanation :
NCL, India is a research, development and consulting organization with a focus on chemistry and chemical engineering. It has a successful record of research partnership with industry and is located in pune. NCL belongs to the family of Council of Scientific and Industrial Research (CSIR), the largest chain of public funded research organization in world. NCL's human resources comprise of over 1000 people of whom 350 are scientist, 110 are technical staff with advanced degrees in science, technology or engineering.
[13] The major constituent of gobar gas is –
A.
Carbon dioxide
B.
Methane
C.
Butane
D.
Isobutane
Ans:
Methane
Explanation :
lobar Gas (Methane) is generated by the decomposition of organic cow dung. It consists of 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. The composition of biogas varies depending upon the origin of the anaerobic digestion process. Landfill gas typically has methane concentrations around 50%.
[14] The residue left after extracting juice from sugar beet and sugarcane is called –
A.
molasses
B.
bagasse
C.
whey
D.
biomass
Ans:
bagasse
Explanation :
Bagasse is the fibrous matter that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is currently used as a biofuel and in the manufacture of pulp and paper products and building materials. Agave bagasse is a similar material that consists of the, tissue of the blue agave after extraction of the sap. For each 10 tonnes of sugarcane crushed, a sugar factory produces nearly 3 tonnes of wet bagasse. Since bagasse is a by-product of the cane sugar industry, the quantity of production in each country is in line with the quantity of sugarcane produced.
[15] Indane gas is a mixture of which gases?
A.
butane and hydrogen
B.
butane and propane
C.
butane and oxygen
D.
methane and oxygen
Ans:
butane and propane
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. Although galvanization can be done with electrochemical and electro-deposition processes, the most common method in current use is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc.
[10] Which of the following produces highest amount of energy upon oxidation?
A.
Protein
B.
Fat
C.
Glucose
D.
An alkane
Ans:
Fat
Explanation :
Fats consist of a wide group of compounds that are generally soluble in organic solvents and generally insoluble in water. Chemically, fats are triglycerides, triesters of glycerol and any of several fatty acids. Fats may be either solid or liquid at room temperature, depending on their structure and composition. Although the words "oils", "fats", and "lipids" are all used to refer to fats, "oils" is usually used to refer to fats that are liquids at normal room temperature, while "fats" is usually used to refer to fats that are solids at normal room temperature.
[11] Which of the following substance is highly plastic?
A.
Quartz
B.
Mica
C.
Granite
D.
Clay
Ans:
Clay
Explanation :
Clays exhibit plasticity when mixed with water in certain proportions. When dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes occur. These reactions, among other changes, cause the clay to be converted into a ceramic material. Because of these properties, clay is used for making pottery items, both utilitarian and decorative. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain.
[12] The National Chemical Laboratory (India) is located in –
A.
Mumbai
B.
Bangaluru
C.
Hyderabad
D.
Pune
Ans:
Pune
Explanation :
NCL, India is a research, development and consulting organization with a focus on chemistry and chemical engineering. It has a successful record of research partnership with industry and is located in pune. NCL belongs to the family of Council of Scientific and Industrial Research (CSIR), the largest chain of public funded research organization in world. NCL's human resources comprise of over 1000 people of whom 350 are scientist, 110 are technical staff with advanced degrees in science, technology or engineering.
[13] The major constituent of gobar gas is –
A.
Carbon dioxide
B.
Methane
C.
Butane
D.
Isobutane
Ans:
Methane
Explanation :
lobar Gas (Methane) is generated by the decomposition of organic cow dung. It consists of 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. The composition of biogas varies depending upon the origin of the anaerobic digestion process. Landfill gas typically has methane concentrations around 50%.
[14] The residue left after extracting juice from sugar beet and sugarcane is called –
A.
molasses
B.
bagasse
C.
whey
D.
biomass
Ans:
bagasse
Explanation :
Bagasse is the fibrous matter that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is currently used as a biofuel and in the manufacture of pulp and paper products and building materials. Agave bagasse is a similar material that consists of the, tissue of the blue agave after extraction of the sap. For each 10 tonnes of sugarcane crushed, a sugar factory produces nearly 3 tonnes of wet bagasse. Since bagasse is a by-product of the cane sugar industry, the quantity of production in each country is in line with the quantity of sugarcane produced.
[15] Indane gas is a mixture of which gases?
A.
butane and hydrogen
B.
butane and propane
C.
butane and oxygen
D.
methane and oxygen
Ans:
butane and propane
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Clays exhibit plasticity when mixed with water in certain proportions. When dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes occur. These reactions, among other changes, cause the clay to be converted into a ceramic material. Because of these properties, clay is used for making pottery items, both utilitarian and decorative. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain.
[12] The National Chemical Laboratory (India) is located in –
A.
Mumbai
B.
Bangaluru
C.
Hyderabad
D.
Pune
Ans:
Pune
Explanation :
NCL, India is a research, development and consulting organization with a focus on chemistry and chemical engineering. It has a successful record of research partnership with industry and is located in pune. NCL belongs to the family of Council of Scientific and Industrial Research (CSIR), the largest chain of public funded research organization in world. NCL's human resources comprise of over 1000 people of whom 350 are scientist, 110 are technical staff with advanced degrees in science, technology or engineering.
[13] The major constituent of gobar gas is –
A.
Carbon dioxide
B.
Methane
C.
Butane
D.
Isobutane
Ans:
Methane
Explanation :
lobar Gas (Methane) is generated by the decomposition of organic cow dung. It consists of 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. The composition of biogas varies depending upon the origin of the anaerobic digestion process. Landfill gas typically has methane concentrations around 50%.
[14] The residue left after extracting juice from sugar beet and sugarcane is called –
A.
molasses
B.
bagasse
C.
whey
D.
biomass
Ans:
bagasse
Explanation :
Bagasse is the fibrous matter that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is currently used as a biofuel and in the manufacture of pulp and paper products and building materials. Agave bagasse is a similar material that consists of the, tissue of the blue agave after extraction of the sap. For each 10 tonnes of sugarcane crushed, a sugar factory produces nearly 3 tonnes of wet bagasse. Since bagasse is a by-product of the cane sugar industry, the quantity of production in each country is in line with the quantity of sugarcane produced.
[15] Indane gas is a mixture of which gases?
A.
butane and hydrogen
B.
butane and propane
C.
butane and oxygen
D.
methane and oxygen
Ans:
butane and propane
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
lobar Gas (Methane) is generated by the decomposition of organic cow dung. It consists of 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. The composition of biogas varies depending upon the origin of the anaerobic digestion process. Landfill gas typically has methane concentrations around 50%.
[14] The residue left after extracting juice from sugar beet and sugarcane is called –
A.
molasses
B.
bagasse
C.
whey
D.
biomass
Ans:
bagasse
Explanation :
Bagasse is the fibrous matter that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is currently used as a biofuel and in the manufacture of pulp and paper products and building materials. Agave bagasse is a similar material that consists of the, tissue of the blue agave after extraction of the sap. For each 10 tonnes of sugarcane crushed, a sugar factory produces nearly 3 tonnes of wet bagasse. Since bagasse is a by-product of the cane sugar industry, the quantity of production in each country is in line with the quantity of sugarcane produced.
[15] Indane gas is a mixture of which gases?
A.
butane and hydrogen
B.
butane and propane
C.
butane and oxygen
D.
methane and oxygen
Ans:
butane and propane
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Indane Gas is a liquefied petroleum gas (LPG), main constituents of these gases are; propane, butane, propylene, butylene, and isobutane. LPG is a highly flammable mixture of these hydrocarbon gases which is widely used as a fuel in household cooking applications and also used as a fuel in some automobiles.
[16] Who among the following discovered electron?
A.
J.J Thomson
B.
Max Born
C.
Antoine Lavoisier
D.
Mendeleef
Ans:
J.J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
[17] Nuclear fission is caused by the impact of -
A.
Proton
B.
Electron
C.
Neutron
D.
None of these
Ans:
Neutron
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Nuclear fission in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
[18] Acid rain is due to air pollution by -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Methane
D.
Nitrous oxide and Sulfur dioxide
Ans:
Nitrous oxide and Sulfur dioxide
Explanation :
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and Nitrous oxide (N2O).
[19] Milk is a natural –
A.
Solution
B.
Emulsion
C.
Mixture
D.
Suspension
Ans:
Emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both the dispersed and the continuous phase are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
[20] A polymeric substance used to make parachute is –
A.
Rayon
B.
Viscose
C.
Cotton
D.
Terylene
Ans:
Viscose
Explanation :
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.
[21] The metallic Constituents of hard water are –
A.
Magnesium, calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
[22] The pH of human blood is between –
A.
6.5-7
B.
7.5-8
C.
8-9
D.
4.5-5
Ans:
7.5-8
Explanation :
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood pH is regulated to stay within the narrow range of 7.5 to 8. Blood that has a pH below 7.5 is too acidic, whereas blood pH above 7.5 is too alkaline.
[23] Which of the following is used as a lubricant in heavy machines?
A.
Bauxite
B.
Sulphur
C.
Phosphorus
D.
Graphite
Ans:
Graphite
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
Graphite is used as a lubricant in heavy machines. it is made of carbon atoms arranged in sheets of hexagonal units - looks a lot like chicken-wire. Another sheet forms on top of this and so on. There is no proper connection (in ideal graphite) between the sheets, so they are able to slide freely over each other without breaking any bonds.
[24] What is the element that is in the highest percentage in the composition of the earth?
A.
Silicon
B.
Oxygen
C.
Magnesium
D.
Iron
Ans:
Oxygen
Explanation :
Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system smaller than the four gas giants, Jupiter, Saturn, Uranus and Neptune, but larger than the three other rocky planets, Mercury, Mars and Venus. Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.
[25] Formation of ozone hole is maximum over –
A.
Africa
B.
India
C.
Antarctica
D.
Europe
Ans:
Antarctica
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.
Explanation :
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone. Most ozone is formed in the stratosphere over the equation and spread by winds around the globe. Icy particles in polar stratospheric clouds catalyze the release of chlorine (from CFC) which destroys ozone. The thinning of ozone is maximum because winter there is exceptionally cold.