[1] Who developed Hydrogen Bomb?
A.
Wernher Von Braun
B.
J. Robert Oppen Heimer
C.
Edward Teller
D.
Samuel Cohen
Ans:
Edward Teller
Explanation :
Portions of the development and history of the hydrogen bomb remain classified. But it is public knowledge that its chief architect was Dr. Edward Teller. The first H bomb (or thermonuclear bomb / fusion bomb) detonated was on November 1, 1952 in Enewetak in the Marshall Islands. The hydrogen bomb is also called the Teller-Ulam design, after Edward Teller and Stanislaw Ulam who helped in the project too.
[2] The fundamental particles present in the nucleus of an atom are -
A.
Electron, proton
B.
Proton, neutron
C.
Neutron, electron
D.
Neutron, positron
Ans:
Proton, neutron
Explanation :
The nucleus is the very dense region consisting of protons and neutrons at the center of an atom. It was discovered in 1911, as a result of Ernest Rutherford's interpretation of the famous 1909 Rutherford experiment performed by Hans Geiger and Ernest. Marsden, under dip direction of Rutherford. The proton—neutron model of nucleus was proposed by Dmity Ivanenko in 1932. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the orbiting electrons.
[3] Bleaching action of moist sulphur dioxide is because of its –
A.
basic property
B.
acidic property
C.
oxidising property
D.
reducing property
Ans:
oxidising property
Explanation :
In moist conditions, sulphur dioxide is a bleaching agent. In the reducing action of SO2, oxygen is removed from coloured dye. Sulphur dioxide is used to bleach wool and silk. Salts of sulphur dioxide are also used in bleaching. Calcium hydrogen sulphite Ca(HSO3)2 is used to whiten wood pulp in the manufacturing of paper.
[4] The long range potential of nuclear energy in India depends on its reserves of –
A.
thorium
B.
uranium
C.
plutonium
D.
radium
Ans:
uranium
Explanation :
India's domestic uranium reserves are small and the country is dependent on uranium imports to fuel its nuclear power industry. Since early 1990s, Russia has been a major supplier of nuclear fuel-to India.
[5] Which of the following gases will effuse out of football bladder most wieldy?
A.
He
B.
H2
C.
N2
D.
O2
Ans:
H2
Explanation :
Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H1) is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Naturally occurring atomic hydrogen is rare on Earth because hydrogen readily forms covalent compounds with most elements and is present in the-water molecule and in most organic compounds.
[6] Silk fibre chemically is –
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Cellulose
Ans:
Protein
Explanation :
Silk is a natural protein fibre, some forms of which can be woven into textiles. The protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyxmorireared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colours.
[7] Milk tastes sour when it is left in open for some time. This happens due to the formation of –
A.
Lactic acid
B.
Citric acid
C.
Acetic acid
D.
Carbonic acid
Ans:
Lactic acid
Explanation :
Milk contains a sugar called lactose, a disaccharide (compound sugar) made by the glycosidic bonding between glucose and glactose (monosaccharides). When milk is heated to a temperature of 30-40 degrees centigrade and a small amount of old curd added to it, the lactobacillus in that curd sample gets activated and multiplies. These convert the lactose into lactic acid, which imparts the sour taste to curd.
[8] The polymerization of which of the Following is used in manufacturing of polythene in industry?
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a rather stable molecule that polymerizes only upon contact with catalysts. The conversion is highly exothermic, that is the process releases a lot of heat. Coordination polymerization is the most pervasive technology, which means that metal chlorides or metal oxides are used.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Which of the following is a natural polymer?
A.
Bakelite
B.
Nylon
C.
Polythene
D.
Starch
Ans:
Starch
Explanation :
Cotton, starch, cellulose and rubber are some of the naturally occurring polymers. Starch is a condensation polymer made up of hundreds of glucose monomers, which split out water molecules as they chemically combine.
[11] Who proposed first atomic theory?
A.
E. Rutherford
B.
De Broglie
C.
John Dalton
D.
D. I. Mendeleev
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[12] Which one of the following has the highest fuel value?
A.
Hydrogen
B.
Charcoal
C.
Natural gas
D.
Gasoline
Ans:
Hydrogen
Explanation :
Hydrogen has the highest calorific value of (141,790 KJ/kg ) thus have highest fuel value. Calorific value of charcoal, natural gas and gasoline are (29,600; 43,000; 47,300 kJ/ kg) respectively.
[13] The major constituent of air is –
A.
nitrogen
B.
carbon dioxide
C.
oxygen
D.
hydrogen
Ans:
nitrogen
Explanation :
Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
[14] Cream gets separated out of milk when it is churned. This is due to–
A.
gravitational force
B.
centripetal force
C.
centrifugal force
D.
frictional force
Ans:
centrifugal force
Explanation :
During the churning of buttermilk, many particles of curd undergo rotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre.
[15] Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
A.
Calcium Carbonate
B.
Barium Carbonate
C.
Calcium Hydrogen Carbonate
D.
Calcium Oxide
Ans:
Calcium Carbonate
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Portions of the development and history of the hydrogen bomb remain classified. But it is public knowledge that its chief architect was Dr. Edward Teller. The first H bomb (or thermonuclear bomb / fusion bomb) detonated was on November 1, 1952 in Enewetak in the Marshall Islands. The hydrogen bomb is also called the Teller-Ulam design, after Edward Teller and Stanislaw Ulam who helped in the project too.
[2] The fundamental particles present in the nucleus of an atom are -
A.
Electron, proton
B.
Proton, neutron
C.
Neutron, electron
D.
Neutron, positron
Ans:
Proton, neutron
Explanation :
The nucleus is the very dense region consisting of protons and neutrons at the center of an atom. It was discovered in 1911, as a result of Ernest Rutherford's interpretation of the famous 1909 Rutherford experiment performed by Hans Geiger and Ernest. Marsden, under dip direction of Rutherford. The proton—neutron model of nucleus was proposed by Dmity Ivanenko in 1932. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the orbiting electrons.
[3] Bleaching action of moist sulphur dioxide is because of its –
A.
basic property
B.
acidic property
C.
oxidising property
D.
reducing property
Ans:
oxidising property
Explanation :
In moist conditions, sulphur dioxide is a bleaching agent. In the reducing action of SO2, oxygen is removed from coloured dye. Sulphur dioxide is used to bleach wool and silk. Salts of sulphur dioxide are also used in bleaching. Calcium hydrogen sulphite Ca(HSO3)2 is used to whiten wood pulp in the manufacturing of paper.
[4] The long range potential of nuclear energy in India depends on its reserves of –
A.
thorium
B.
uranium
C.
plutonium
D.
radium
Ans:
uranium
Explanation :
India's domestic uranium reserves are small and the country is dependent on uranium imports to fuel its nuclear power industry. Since early 1990s, Russia has been a major supplier of nuclear fuel-to India.
[5] Which of the following gases will effuse out of football bladder most wieldy?
A.
He
B.
H2
C.
N2
D.
O2
Ans:
H2
Explanation :
Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H1) is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Naturally occurring atomic hydrogen is rare on Earth because hydrogen readily forms covalent compounds with most elements and is present in the-water molecule and in most organic compounds.
[6] Silk fibre chemically is –
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Cellulose
Ans:
Protein
Explanation :
Silk is a natural protein fibre, some forms of which can be woven into textiles. The protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyxmorireared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colours.
[7] Milk tastes sour when it is left in open for some time. This happens due to the formation of –
A.
Lactic acid
B.
Citric acid
C.
Acetic acid
D.
Carbonic acid
Ans:
Lactic acid
Explanation :
Milk contains a sugar called lactose, a disaccharide (compound sugar) made by the glycosidic bonding between glucose and glactose (monosaccharides). When milk is heated to a temperature of 30-40 degrees centigrade and a small amount of old curd added to it, the lactobacillus in that curd sample gets activated and multiplies. These convert the lactose into lactic acid, which imparts the sour taste to curd.
[8] The polymerization of which of the Following is used in manufacturing of polythene in industry?
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a rather stable molecule that polymerizes only upon contact with catalysts. The conversion is highly exothermic, that is the process releases a lot of heat. Coordination polymerization is the most pervasive technology, which means that metal chlorides or metal oxides are used.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Which of the following is a natural polymer?
A.
Bakelite
B.
Nylon
C.
Polythene
D.
Starch
Ans:
Starch
Explanation :
Cotton, starch, cellulose and rubber are some of the naturally occurring polymers. Starch is a condensation polymer made up of hundreds of glucose monomers, which split out water molecules as they chemically combine.
[11] Who proposed first atomic theory?
A.
E. Rutherford
B.
De Broglie
C.
John Dalton
D.
D. I. Mendeleev
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[12] Which one of the following has the highest fuel value?
A.
Hydrogen
B.
Charcoal
C.
Natural gas
D.
Gasoline
Ans:
Hydrogen
Explanation :
Hydrogen has the highest calorific value of (141,790 KJ/kg ) thus have highest fuel value. Calorific value of charcoal, natural gas and gasoline are (29,600; 43,000; 47,300 kJ/ kg) respectively.
[13] The major constituent of air is –
A.
nitrogen
B.
carbon dioxide
C.
oxygen
D.
hydrogen
Ans:
nitrogen
Explanation :
Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
[14] Cream gets separated out of milk when it is churned. This is due to–
A.
gravitational force
B.
centripetal force
C.
centrifugal force
D.
frictional force
Ans:
centrifugal force
Explanation :
During the churning of buttermilk, many particles of curd undergo rotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre.
[15] Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
A.
Calcium Carbonate
B.
Barium Carbonate
C.
Calcium Hydrogen Carbonate
D.
Calcium Oxide
Ans:
Calcium Carbonate
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
In moist conditions, sulphur dioxide is a bleaching agent. In the reducing action of SO2, oxygen is removed from coloured dye. Sulphur dioxide is used to bleach wool and silk. Salts of sulphur dioxide are also used in bleaching. Calcium hydrogen sulphite Ca(HSO3)2 is used to whiten wood pulp in the manufacturing of paper.
[4] The long range potential of nuclear energy in India depends on its reserves of –
A.
thorium
B.
uranium
C.
plutonium
D.
radium
Ans:
uranium
Explanation :
India's domestic uranium reserves are small and the country is dependent on uranium imports to fuel its nuclear power industry. Since early 1990s, Russia has been a major supplier of nuclear fuel-to India.
[5] Which of the following gases will effuse out of football bladder most wieldy?
A.
He
B.
H2
C.
N2
D.
O2
Ans:
H2
Explanation :
Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H1) is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Naturally occurring atomic hydrogen is rare on Earth because hydrogen readily forms covalent compounds with most elements and is present in the-water molecule and in most organic compounds.
[6] Silk fibre chemically is –
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Cellulose
Ans:
Protein
Explanation :
Silk is a natural protein fibre, some forms of which can be woven into textiles. The protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyxmorireared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colours.
[7] Milk tastes sour when it is left in open for some time. This happens due to the formation of –
A.
Lactic acid
B.
Citric acid
C.
Acetic acid
D.
Carbonic acid
Ans:
Lactic acid
Explanation :
Milk contains a sugar called lactose, a disaccharide (compound sugar) made by the glycosidic bonding between glucose and glactose (monosaccharides). When milk is heated to a temperature of 30-40 degrees centigrade and a small amount of old curd added to it, the lactobacillus in that curd sample gets activated and multiplies. These convert the lactose into lactic acid, which imparts the sour taste to curd.
[8] The polymerization of which of the Following is used in manufacturing of polythene in industry?
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a rather stable molecule that polymerizes only upon contact with catalysts. The conversion is highly exothermic, that is the process releases a lot of heat. Coordination polymerization is the most pervasive technology, which means that metal chlorides or metal oxides are used.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Which of the following is a natural polymer?
A.
Bakelite
B.
Nylon
C.
Polythene
D.
Starch
Ans:
Starch
Explanation :
Cotton, starch, cellulose and rubber are some of the naturally occurring polymers. Starch is a condensation polymer made up of hundreds of glucose monomers, which split out water molecules as they chemically combine.
[11] Who proposed first atomic theory?
A.
E. Rutherford
B.
De Broglie
C.
John Dalton
D.
D. I. Mendeleev
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[12] Which one of the following has the highest fuel value?
A.
Hydrogen
B.
Charcoal
C.
Natural gas
D.
Gasoline
Ans:
Hydrogen
Explanation :
Hydrogen has the highest calorific value of (141,790 KJ/kg ) thus have highest fuel value. Calorific value of charcoal, natural gas and gasoline are (29,600; 43,000; 47,300 kJ/ kg) respectively.
[13] The major constituent of air is –
A.
nitrogen
B.
carbon dioxide
C.
oxygen
D.
hydrogen
Ans:
nitrogen
Explanation :
Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
[14] Cream gets separated out of milk when it is churned. This is due to–
A.
gravitational force
B.
centripetal force
C.
centrifugal force
D.
frictional force
Ans:
centrifugal force
Explanation :
During the churning of buttermilk, many particles of curd undergo rotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre.
[15] Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
A.
Calcium Carbonate
B.
Barium Carbonate
C.
Calcium Hydrogen Carbonate
D.
Calcium Oxide
Ans:
Calcium Carbonate
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H1) is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Naturally occurring atomic hydrogen is rare on Earth because hydrogen readily forms covalent compounds with most elements and is present in the-water molecule and in most organic compounds.
[6] Silk fibre chemically is –
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Cellulose
Ans:
Protein
Explanation :
Silk is a natural protein fibre, some forms of which can be woven into textiles. The protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyxmorireared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colours.
[7] Milk tastes sour when it is left in open for some time. This happens due to the formation of –
A.
Lactic acid
B.
Citric acid
C.
Acetic acid
D.
Carbonic acid
Ans:
Lactic acid
Explanation :
Milk contains a sugar called lactose, a disaccharide (compound sugar) made by the glycosidic bonding between glucose and glactose (monosaccharides). When milk is heated to a temperature of 30-40 degrees centigrade and a small amount of old curd added to it, the lactobacillus in that curd sample gets activated and multiplies. These convert the lactose into lactic acid, which imparts the sour taste to curd.
[8] The polymerization of which of the Following is used in manufacturing of polythene in industry?
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a rather stable molecule that polymerizes only upon contact with catalysts. The conversion is highly exothermic, that is the process releases a lot of heat. Coordination polymerization is the most pervasive technology, which means that metal chlorides or metal oxides are used.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Which of the following is a natural polymer?
A.
Bakelite
B.
Nylon
C.
Polythene
D.
Starch
Ans:
Starch
Explanation :
Cotton, starch, cellulose and rubber are some of the naturally occurring polymers. Starch is a condensation polymer made up of hundreds of glucose monomers, which split out water molecules as they chemically combine.
[11] Who proposed first atomic theory?
A.
E. Rutherford
B.
De Broglie
C.
John Dalton
D.
D. I. Mendeleev
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[12] Which one of the following has the highest fuel value?
A.
Hydrogen
B.
Charcoal
C.
Natural gas
D.
Gasoline
Ans:
Hydrogen
Explanation :
Hydrogen has the highest calorific value of (141,790 KJ/kg ) thus have highest fuel value. Calorific value of charcoal, natural gas and gasoline are (29,600; 43,000; 47,300 kJ/ kg) respectively.
[13] The major constituent of air is –
A.
nitrogen
B.
carbon dioxide
C.
oxygen
D.
hydrogen
Ans:
nitrogen
Explanation :
Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
[14] Cream gets separated out of milk when it is churned. This is due to–
A.
gravitational force
B.
centripetal force
C.
centrifugal force
D.
frictional force
Ans:
centrifugal force
Explanation :
During the churning of buttermilk, many particles of curd undergo rotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre.
[15] Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
A.
Calcium Carbonate
B.
Barium Carbonate
C.
Calcium Hydrogen Carbonate
D.
Calcium Oxide
Ans:
Calcium Carbonate
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Milk contains a sugar called lactose, a disaccharide (compound sugar) made by the glycosidic bonding between glucose and glactose (monosaccharides). When milk is heated to a temperature of 30-40 degrees centigrade and a small amount of old curd added to it, the lactobacillus in that curd sample gets activated and multiplies. These convert the lactose into lactic acid, which imparts the sour taste to curd.
[8] The polymerization of which of the Following is used in manufacturing of polythene in industry?
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a rather stable molecule that polymerizes only upon contact with catalysts. The conversion is highly exothermic, that is the process releases a lot of heat. Coordination polymerization is the most pervasive technology, which means that metal chlorides or metal oxides are used.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Which of the following is a natural polymer?
A.
Bakelite
B.
Nylon
C.
Polythene
D.
Starch
Ans:
Starch
Explanation :
Cotton, starch, cellulose and rubber are some of the naturally occurring polymers. Starch is a condensation polymer made up of hundreds of glucose monomers, which split out water molecules as they chemically combine.
[11] Who proposed first atomic theory?
A.
E. Rutherford
B.
De Broglie
C.
John Dalton
D.
D. I. Mendeleev
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[12] Which one of the following has the highest fuel value?
A.
Hydrogen
B.
Charcoal
C.
Natural gas
D.
Gasoline
Ans:
Hydrogen
Explanation :
Hydrogen has the highest calorific value of (141,790 KJ/kg ) thus have highest fuel value. Calorific value of charcoal, natural gas and gasoline are (29,600; 43,000; 47,300 kJ/ kg) respectively.
[13] The major constituent of air is –
A.
nitrogen
B.
carbon dioxide
C.
oxygen
D.
hydrogen
Ans:
nitrogen
Explanation :
Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
[14] Cream gets separated out of milk when it is churned. This is due to–
A.
gravitational force
B.
centripetal force
C.
centrifugal force
D.
frictional force
Ans:
centrifugal force
Explanation :
During the churning of buttermilk, many particles of curd undergo rotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre.
[15] Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
A.
Calcium Carbonate
B.
Barium Carbonate
C.
Calcium Hydrogen Carbonate
D.
Calcium Oxide
Ans:
Calcium Carbonate
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Which of the following is a natural polymer?
A.
Bakelite
B.
Nylon
C.
Polythene
D.
Starch
Ans:
Starch
Explanation :
Cotton, starch, cellulose and rubber are some of the naturally occurring polymers. Starch is a condensation polymer made up of hundreds of glucose monomers, which split out water molecules as they chemically combine.
[11] Who proposed first atomic theory?
A.
E. Rutherford
B.
De Broglie
C.
John Dalton
D.
D. I. Mendeleev
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[12] Which one of the following has the highest fuel value?
A.
Hydrogen
B.
Charcoal
C.
Natural gas
D.
Gasoline
Ans:
Hydrogen
Explanation :
Hydrogen has the highest calorific value of (141,790 KJ/kg ) thus have highest fuel value. Calorific value of charcoal, natural gas and gasoline are (29,600; 43,000; 47,300 kJ/ kg) respectively.
[13] The major constituent of air is –
A.
nitrogen
B.
carbon dioxide
C.
oxygen
D.
hydrogen
Ans:
nitrogen
Explanation :
Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
[14] Cream gets separated out of milk when it is churned. This is due to–
A.
gravitational force
B.
centripetal force
C.
centrifugal force
D.
frictional force
Ans:
centrifugal force
Explanation :
During the churning of buttermilk, many particles of curd undergo rotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre.
[15] Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
A.
Calcium Carbonate
B.
Barium Carbonate
C.
Calcium Hydrogen Carbonate
D.
Calcium Oxide
Ans:
Calcium Carbonate
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[12] Which one of the following has the highest fuel value?
A.
Hydrogen
B.
Charcoal
C.
Natural gas
D.
Gasoline
Ans:
Hydrogen
Explanation :
Hydrogen has the highest calorific value of (141,790 KJ/kg ) thus have highest fuel value. Calorific value of charcoal, natural gas and gasoline are (29,600; 43,000; 47,300 kJ/ kg) respectively.
[13] The major constituent of air is –
A.
nitrogen
B.
carbon dioxide
C.
oxygen
D.
hydrogen
Ans:
nitrogen
Explanation :
Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
[14] Cream gets separated out of milk when it is churned. This is due to–
A.
gravitational force
B.
centripetal force
C.
centrifugal force
D.
frictional force
Ans:
centrifugal force
Explanation :
During the churning of buttermilk, many particles of curd undergo rotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre.
[15] Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
A.
Calcium Carbonate
B.
Barium Carbonate
C.
Calcium Hydrogen Carbonate
D.
Calcium Oxide
Ans:
Calcium Carbonate
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
[14] Cream gets separated out of milk when it is churned. This is due to–
A.
gravitational force
B.
centripetal force
C.
centrifugal force
D.
frictional force
Ans:
centrifugal force
Explanation :
During the churning of buttermilk, many particles of curd undergo rotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre.
[15] Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
A.
Calcium Carbonate
B.
Barium Carbonate
C.
Calcium Hydrogen Carbonate
D.
Calcium Oxide
Ans:
Calcium Carbonate
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate.
[16] German silver is an alloy of -
A.
copper, nickel and silver
B.
silver, copper and aluminium
C.
zinc, copper and nickel
D.
silver, zinc and copper
Ans:
zinc, copper and nickel
Explanation :
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
[17] One of the constituents of tear gas is -
A.
Ethane
B.
Ethanol
C.
Ether
D.
Chloropicrin
Ans:
Chloropicrin
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin.
[18] An atomic clock is based on transitions in -
A.
Sodium
B.
Caesium
C.
Magnesium
D.
Aluminium
Ans:
Caesium
Explanation :
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
[19] The temperature of oxyacetylene flame is around –
A.
2800°C
B.
3200°C
C.
4000°C
D.
1500°C
Ans:
3200°C
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.
[20] What product is formed when electricity is passed through an aqueous solution of sodium chloride?
A.
Sodium and water
B.
Sodium oxide
C.
Sodium and chlorine
D.
Sodium hydroxide
Ans:
Sodium hydroxide
Explanation :
When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product.
[21] The atmospheric gas that is mainly responsible for Green House effect –
A.
Ozone
B.
Nitrogen
C.
Oxygen
D.
Carbondioxide
Ans:
Carbondioxide
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
[22] Tar roads get damaged if there is –
A.
stagnation of water on road
B.
heavy traffic
C.
no maintenance
D.
no sloping
Ans:
stagnation of water on road
Explanation :
Overflow of water or water stagnation damage tar roads. Water which penetrates the surface can get into the base course to cause trouble, and at the same time start oxidizing the binder inside the pavement.
[23] The drug 'Marijuana' is a –
A.
sedative
B.
mental stimulant
C.
hallucinating substance
D.
tranquillizer
Ans:
sedative
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
Cannabis, also known as marijuana is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Cannabis indica is known for sedative effects and preferred night time as medical cannabis.
[24] Chemically 'Quick Silver’ is known as –
A.
Mercury
B.
Silver
C.
Gold
D.
Copper
Ans:
Mercury
Explanation :
Quicksilver is an alternative name for the element mercury. A heavy, silvery d-block element, mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
[25] Extensively used nitrogenous fertilizer is –
A.
Ammonium nitrate
B.
Urea
C.
Ammonium sulphate
D.
Nitro-lime
Ans:
Urea
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.