[1] This substance is commonly known as alcohol and is also used in medicines such as tincture iodine, cough syrups, and many tonics. This is -
A.
Propanol
B.
Butane
C.
Ethanol
D.
Methanol
Ans:
Ethanol
Explanation :
Ethanol is commonly called alcohol and is the active ingredient of all alcoholic drinks. Also, it is a good solvent and is used in medicines such as tincture iodine, cough syrups, and many tonics.
[2] Enzymes are -
A.
Steroids
B.
Carbohydrates
C.
Proteins
D.
Lipids
Ans:
Proteins
Explanation :
Enzymes are protein molecules in cells which work as catalysts. Most enzymes are proteins, although a few are catalytic RNA molecules; the latter are called ribozymes.
[3] Sulphuric acid is –
A.
monobasic
B.
dibasic
C.
tribasic
D.
tetrabasic
Ans:
dibasic
Explanation :
An example of a dibasic acid is sulphuric acid H2SO4. Dibasic acids yield two free hydrogen ions in solution for each molecule of acid ionized.
[4] Which of the following metals can deposit copper from copper sulphate solution?
A.
platinum
B.
Mercury
C.
Iron
D.
Gold
Ans:
Iron
Explanation :
The iron displaces copper from its salt, to make iron sulfate solution and deposit a thin coating of metallic copper on the surface of the metal. In general, any metal higher than copper in the "electromotive series" will displace copper from copper sulfate solution.
[5] When Arsenic atoms are added Germanium lattice, it becomes a/an -
A.
Insulator
B.
Superconductor
C.
Intrinsic semiconductor
D.
Extrinsic semiconductor
Ans:
Extrinsic semiconductor
Explanation :
When a peritavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with thegermanium atoms, leaving 1 electron relatively free in the crystal structure. Pure germanium may be converted into an N-type semiconductor by "doping" it with any donor impurity having 5 valence electrons in its outer shell. Semiconductors which are doped in this manner - either with N- or P-type impurities - are referred to as EXTRINSIC semiconductors.
[6] Hydrogen bomb is based upon the principle of .
A.
Nuclear fission
B.
Nuclear fusion
C.
Controller nuclear reaction
D.
None of these
Ans:
Nuclear fusion
Explanation :
The hydrogen bomb eventually relies upon atomic fusion (adding to the atomic nucleus) to release energy. Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[7] In an acid base reaction which product is produced along with a salt?
A.
Hydrogen gas
B.
Oxygen gas
C.
Carbon dioxide
D.
Water
Ans:
Water
Explanation :
When an acid and a base are placed together, they read to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
[8] The element present in the largest amount in rocks and minerals is -
A.
carbon
B.
silicon
C.
hydrogen
D.
aluminium
Ans:
silicon
Explanation :
Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates.
[9] Washing soda is -
A.
sodium sulphite
B.
sodium bicarbonate
C.
sodiun carbonate
D.
sodium biosulphite
Ans:
sodiun carbonate
Explanation :
Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
[10] An element that does not occur in nature but can be produced artificially is –
A.
thorium
B.
radium
C.
plutonium
D.
uranium
Ans:
plutonium
Explanation :
0
[11] Chloroform can be used as –
A.
Analgesic
B.
Anaesthetic
C.
Antimalarial
D.
Antibiotic
Ans:
Anaesthetic
Explanation :
Chloroform can be used as Anaesthetic. Chloroform (CHCl3) on heating with silver powder undergoes dehalogenation to form Ethyne.
[12] Gas released during Bhopal tragedy was –
A.
Sodium isothiocyanate
B.
Potassium isothiocyanate
C.
Ethyl isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides. As a highly toxic and irritating material, it is extremely hazardous to human health. It was the principal toxin involved in the Bhopal disaster, which killed nearly 8,000 people initially and approximately 20,000 to 30,000 people in total.
[13] When water itself combines chemically with some element or mineral it is called –
A.
Carbonation
B.
Desilication
C.
Hydration
D.
Oxidation
Ans:
Hydration
Explanation :
When water combines chemically with other elements, the process is called hydration. In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (-OH) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runs in a strong acidic, aqueous solution. Hydration leaves the non-water component intact.
[14] The electronic configuration of an atom having atomic number `20' is –
A.
2, 8, 10
B.
2, 6, 8, 4
C.
2, 8, 8, 2
D.
2, 10, 8
Ans:
2, 8, 8, 2
Explanation :
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
[15] Which chemical is used to ripen mangoes artificially?
A.
Sulphur Dioxide
B.
Nitrous Oxide
C.
Calcium Carbide
D.
Phosphorous
Ans:
Calcium Carbide
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
Ethanol is commonly called alcohol and is the active ingredient of all alcoholic drinks. Also, it is a good solvent and is used in medicines such as tincture iodine, cough syrups, and many tonics.
[2] Enzymes are -
A.
Steroids
B.
Carbohydrates
C.
Proteins
D.
Lipids
Ans:
Proteins
Explanation :
Enzymes are protein molecules in cells which work as catalysts. Most enzymes are proteins, although a few are catalytic RNA molecules; the latter are called ribozymes.
[3] Sulphuric acid is –
A.
monobasic
B.
dibasic
C.
tribasic
D.
tetrabasic
Ans:
dibasic
Explanation :
An example of a dibasic acid is sulphuric acid H2SO4. Dibasic acids yield two free hydrogen ions in solution for each molecule of acid ionized.
[4] Which of the following metals can deposit copper from copper sulphate solution?
A.
platinum
B.
Mercury
C.
Iron
D.
Gold
Ans:
Iron
Explanation :
The iron displaces copper from its salt, to make iron sulfate solution and deposit a thin coating of metallic copper on the surface of the metal. In general, any metal higher than copper in the "electromotive series" will displace copper from copper sulfate solution.
[5] When Arsenic atoms are added Germanium lattice, it becomes a/an -
A.
Insulator
B.
Superconductor
C.
Intrinsic semiconductor
D.
Extrinsic semiconductor
Ans:
Extrinsic semiconductor
Explanation :
When a peritavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with thegermanium atoms, leaving 1 electron relatively free in the crystal structure. Pure germanium may be converted into an N-type semiconductor by "doping" it with any donor impurity having 5 valence electrons in its outer shell. Semiconductors which are doped in this manner - either with N- or P-type impurities - are referred to as EXTRINSIC semiconductors.
[6] Hydrogen bomb is based upon the principle of .
A.
Nuclear fission
B.
Nuclear fusion
C.
Controller nuclear reaction
D.
None of these
Ans:
Nuclear fusion
Explanation :
The hydrogen bomb eventually relies upon atomic fusion (adding to the atomic nucleus) to release energy. Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[7] In an acid base reaction which product is produced along with a salt?
A.
Hydrogen gas
B.
Oxygen gas
C.
Carbon dioxide
D.
Water
Ans:
Water
Explanation :
When an acid and a base are placed together, they read to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
[8] The element present in the largest amount in rocks and minerals is -
A.
carbon
B.
silicon
C.
hydrogen
D.
aluminium
Ans:
silicon
Explanation :
Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates.
[9] Washing soda is -
A.
sodium sulphite
B.
sodium bicarbonate
C.
sodiun carbonate
D.
sodium biosulphite
Ans:
sodiun carbonate
Explanation :
Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
[10] An element that does not occur in nature but can be produced artificially is –
A.
thorium
B.
radium
C.
plutonium
D.
uranium
Ans:
plutonium
Explanation :
0
[11] Chloroform can be used as –
A.
Analgesic
B.
Anaesthetic
C.
Antimalarial
D.
Antibiotic
Ans:
Anaesthetic
Explanation :
Chloroform can be used as Anaesthetic. Chloroform (CHCl3) on heating with silver powder undergoes dehalogenation to form Ethyne.
[12] Gas released during Bhopal tragedy was –
A.
Sodium isothiocyanate
B.
Potassium isothiocyanate
C.
Ethyl isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides. As a highly toxic and irritating material, it is extremely hazardous to human health. It was the principal toxin involved in the Bhopal disaster, which killed nearly 8,000 people initially and approximately 20,000 to 30,000 people in total.
[13] When water itself combines chemically with some element or mineral it is called –
A.
Carbonation
B.
Desilication
C.
Hydration
D.
Oxidation
Ans:
Hydration
Explanation :
When water combines chemically with other elements, the process is called hydration. In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (-OH) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runs in a strong acidic, aqueous solution. Hydration leaves the non-water component intact.
[14] The electronic configuration of an atom having atomic number `20' is –
A.
2, 8, 10
B.
2, 6, 8, 4
C.
2, 8, 8, 2
D.
2, 10, 8
Ans:
2, 8, 8, 2
Explanation :
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
[15] Which chemical is used to ripen mangoes artificially?
A.
Sulphur Dioxide
B.
Nitrous Oxide
C.
Calcium Carbide
D.
Phosphorous
Ans:
Calcium Carbide
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
An example of a dibasic acid is sulphuric acid H2SO4. Dibasic acids yield two free hydrogen ions in solution for each molecule of acid ionized.
[4] Which of the following metals can deposit copper from copper sulphate solution?
A.
platinum
B.
Mercury
C.
Iron
D.
Gold
Ans:
Iron
Explanation :
The iron displaces copper from its salt, to make iron sulfate solution and deposit a thin coating of metallic copper on the surface of the metal. In general, any metal higher than copper in the "electromotive series" will displace copper from copper sulfate solution.
[5] When Arsenic atoms are added Germanium lattice, it becomes a/an -
A.
Insulator
B.
Superconductor
C.
Intrinsic semiconductor
D.
Extrinsic semiconductor
Ans:
Extrinsic semiconductor
Explanation :
When a peritavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with thegermanium atoms, leaving 1 electron relatively free in the crystal structure. Pure germanium may be converted into an N-type semiconductor by "doping" it with any donor impurity having 5 valence electrons in its outer shell. Semiconductors which are doped in this manner - either with N- or P-type impurities - are referred to as EXTRINSIC semiconductors.
[6] Hydrogen bomb is based upon the principle of .
A.
Nuclear fission
B.
Nuclear fusion
C.
Controller nuclear reaction
D.
None of these
Ans:
Nuclear fusion
Explanation :
The hydrogen bomb eventually relies upon atomic fusion (adding to the atomic nucleus) to release energy. Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[7] In an acid base reaction which product is produced along with a salt?
A.
Hydrogen gas
B.
Oxygen gas
C.
Carbon dioxide
D.
Water
Ans:
Water
Explanation :
When an acid and a base are placed together, they read to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
[8] The element present in the largest amount in rocks and minerals is -
A.
carbon
B.
silicon
C.
hydrogen
D.
aluminium
Ans:
silicon
Explanation :
Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates.
[9] Washing soda is -
A.
sodium sulphite
B.
sodium bicarbonate
C.
sodiun carbonate
D.
sodium biosulphite
Ans:
sodiun carbonate
Explanation :
Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
[10] An element that does not occur in nature but can be produced artificially is –
A.
thorium
B.
radium
C.
plutonium
D.
uranium
Ans:
plutonium
Explanation :
0
[11] Chloroform can be used as –
A.
Analgesic
B.
Anaesthetic
C.
Antimalarial
D.
Antibiotic
Ans:
Anaesthetic
Explanation :
Chloroform can be used as Anaesthetic. Chloroform (CHCl3) on heating with silver powder undergoes dehalogenation to form Ethyne.
[12] Gas released during Bhopal tragedy was –
A.
Sodium isothiocyanate
B.
Potassium isothiocyanate
C.
Ethyl isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides. As a highly toxic and irritating material, it is extremely hazardous to human health. It was the principal toxin involved in the Bhopal disaster, which killed nearly 8,000 people initially and approximately 20,000 to 30,000 people in total.
[13] When water itself combines chemically with some element or mineral it is called –
A.
Carbonation
B.
Desilication
C.
Hydration
D.
Oxidation
Ans:
Hydration
Explanation :
When water combines chemically with other elements, the process is called hydration. In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (-OH) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runs in a strong acidic, aqueous solution. Hydration leaves the non-water component intact.
[14] The electronic configuration of an atom having atomic number `20' is –
A.
2, 8, 10
B.
2, 6, 8, 4
C.
2, 8, 8, 2
D.
2, 10, 8
Ans:
2, 8, 8, 2
Explanation :
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
[15] Which chemical is used to ripen mangoes artificially?
A.
Sulphur Dioxide
B.
Nitrous Oxide
C.
Calcium Carbide
D.
Phosphorous
Ans:
Calcium Carbide
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
When a peritavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with thegermanium atoms, leaving 1 electron relatively free in the crystal structure. Pure germanium may be converted into an N-type semiconductor by "doping" it with any donor impurity having 5 valence electrons in its outer shell. Semiconductors which are doped in this manner - either with N- or P-type impurities - are referred to as EXTRINSIC semiconductors.
[6] Hydrogen bomb is based upon the principle of .
A.
Nuclear fission
B.
Nuclear fusion
C.
Controller nuclear reaction
D.
None of these
Ans:
Nuclear fusion
Explanation :
The hydrogen bomb eventually relies upon atomic fusion (adding to the atomic nucleus) to release energy. Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[7] In an acid base reaction which product is produced along with a salt?
A.
Hydrogen gas
B.
Oxygen gas
C.
Carbon dioxide
D.
Water
Ans:
Water
Explanation :
When an acid and a base are placed together, they read to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
[8] The element present in the largest amount in rocks and minerals is -
A.
carbon
B.
silicon
C.
hydrogen
D.
aluminium
Ans:
silicon
Explanation :
Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates.
[9] Washing soda is -
A.
sodium sulphite
B.
sodium bicarbonate
C.
sodiun carbonate
D.
sodium biosulphite
Ans:
sodiun carbonate
Explanation :
Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
[10] An element that does not occur in nature but can be produced artificially is –
A.
thorium
B.
radium
C.
plutonium
D.
uranium
Ans:
plutonium
Explanation :
0
[11] Chloroform can be used as –
A.
Analgesic
B.
Anaesthetic
C.
Antimalarial
D.
Antibiotic
Ans:
Anaesthetic
Explanation :
Chloroform can be used as Anaesthetic. Chloroform (CHCl3) on heating with silver powder undergoes dehalogenation to form Ethyne.
[12] Gas released during Bhopal tragedy was –
A.
Sodium isothiocyanate
B.
Potassium isothiocyanate
C.
Ethyl isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides. As a highly toxic and irritating material, it is extremely hazardous to human health. It was the principal toxin involved in the Bhopal disaster, which killed nearly 8,000 people initially and approximately 20,000 to 30,000 people in total.
[13] When water itself combines chemically with some element or mineral it is called –
A.
Carbonation
B.
Desilication
C.
Hydration
D.
Oxidation
Ans:
Hydration
Explanation :
When water combines chemically with other elements, the process is called hydration. In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (-OH) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runs in a strong acidic, aqueous solution. Hydration leaves the non-water component intact.
[14] The electronic configuration of an atom having atomic number `20' is –
A.
2, 8, 10
B.
2, 6, 8, 4
C.
2, 8, 8, 2
D.
2, 10, 8
Ans:
2, 8, 8, 2
Explanation :
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
[15] Which chemical is used to ripen mangoes artificially?
A.
Sulphur Dioxide
B.
Nitrous Oxide
C.
Calcium Carbide
D.
Phosphorous
Ans:
Calcium Carbide
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
When an acid and a base are placed together, they read to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
[8] The element present in the largest amount in rocks and minerals is -
A.
carbon
B.
silicon
C.
hydrogen
D.
aluminium
Ans:
silicon
Explanation :
Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates.
[9] Washing soda is -
A.
sodium sulphite
B.
sodium bicarbonate
C.
sodiun carbonate
D.
sodium biosulphite
Ans:
sodiun carbonate
Explanation :
Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
[10] An element that does not occur in nature but can be produced artificially is –
A.
thorium
B.
radium
C.
plutonium
D.
uranium
Ans:
plutonium
Explanation :
0
[11] Chloroform can be used as –
A.
Analgesic
B.
Anaesthetic
C.
Antimalarial
D.
Antibiotic
Ans:
Anaesthetic
Explanation :
Chloroform can be used as Anaesthetic. Chloroform (CHCl3) on heating with silver powder undergoes dehalogenation to form Ethyne.
[12] Gas released during Bhopal tragedy was –
A.
Sodium isothiocyanate
B.
Potassium isothiocyanate
C.
Ethyl isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides. As a highly toxic and irritating material, it is extremely hazardous to human health. It was the principal toxin involved in the Bhopal disaster, which killed nearly 8,000 people initially and approximately 20,000 to 30,000 people in total.
[13] When water itself combines chemically with some element or mineral it is called –
A.
Carbonation
B.
Desilication
C.
Hydration
D.
Oxidation
Ans:
Hydration
Explanation :
When water combines chemically with other elements, the process is called hydration. In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (-OH) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runs in a strong acidic, aqueous solution. Hydration leaves the non-water component intact.
[14] The electronic configuration of an atom having atomic number `20' is –
A.
2, 8, 10
B.
2, 6, 8, 4
C.
2, 8, 8, 2
D.
2, 10, 8
Ans:
2, 8, 8, 2
Explanation :
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
[15] Which chemical is used to ripen mangoes artificially?
A.
Sulphur Dioxide
B.
Nitrous Oxide
C.
Calcium Carbide
D.
Phosphorous
Ans:
Calcium Carbide
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
[10] An element that does not occur in nature but can be produced artificially is –
A.
thorium
B.
radium
C.
plutonium
D.
uranium
Ans:
plutonium
Explanation :
0
[11] Chloroform can be used as –
A.
Analgesic
B.
Anaesthetic
C.
Antimalarial
D.
Antibiotic
Ans:
Anaesthetic
Explanation :
Chloroform can be used as Anaesthetic. Chloroform (CHCl3) on heating with silver powder undergoes dehalogenation to form Ethyne.
[12] Gas released during Bhopal tragedy was –
A.
Sodium isothiocyanate
B.
Potassium isothiocyanate
C.
Ethyl isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides. As a highly toxic and irritating material, it is extremely hazardous to human health. It was the principal toxin involved in the Bhopal disaster, which killed nearly 8,000 people initially and approximately 20,000 to 30,000 people in total.
[13] When water itself combines chemically with some element or mineral it is called –
A.
Carbonation
B.
Desilication
C.
Hydration
D.
Oxidation
Ans:
Hydration
Explanation :
When water combines chemically with other elements, the process is called hydration. In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (-OH) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runs in a strong acidic, aqueous solution. Hydration leaves the non-water component intact.
[14] The electronic configuration of an atom having atomic number `20' is –
A.
2, 8, 10
B.
2, 6, 8, 4
C.
2, 8, 8, 2
D.
2, 10, 8
Ans:
2, 8, 8, 2
Explanation :
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
[15] Which chemical is used to ripen mangoes artificially?
A.
Sulphur Dioxide
B.
Nitrous Oxide
C.
Calcium Carbide
D.
Phosphorous
Ans:
Calcium Carbide
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
Chloroform can be used as Anaesthetic. Chloroform (CHCl3) on heating with silver powder undergoes dehalogenation to form Ethyne.
[12] Gas released during Bhopal tragedy was –
A.
Sodium isothiocyanate
B.
Potassium isothiocyanate
C.
Ethyl isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides. As a highly toxic and irritating material, it is extremely hazardous to human health. It was the principal toxin involved in the Bhopal disaster, which killed nearly 8,000 people initially and approximately 20,000 to 30,000 people in total.
[13] When water itself combines chemically with some element or mineral it is called –
A.
Carbonation
B.
Desilication
C.
Hydration
D.
Oxidation
Ans:
Hydration
Explanation :
When water combines chemically with other elements, the process is called hydration. In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (-OH) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runs in a strong acidic, aqueous solution. Hydration leaves the non-water component intact.
[14] The electronic configuration of an atom having atomic number `20' is –
A.
2, 8, 10
B.
2, 6, 8, 4
C.
2, 8, 8, 2
D.
2, 10, 8
Ans:
2, 8, 8, 2
Explanation :
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
[15] Which chemical is used to ripen mangoes artificially?
A.
Sulphur Dioxide
B.
Nitrous Oxide
C.
Calcium Carbide
D.
Phosphorous
Ans:
Calcium Carbide
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
When water combines chemically with other elements, the process is called hydration. In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (-OH) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runs in a strong acidic, aqueous solution. Hydration leaves the non-water component intact.
[14] The electronic configuration of an atom having atomic number `20' is –
A.
2, 8, 10
B.
2, 6, 8, 4
C.
2, 8, 8, 2
D.
2, 10, 8
Ans:
2, 8, 8, 2
Explanation :
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
[15] Which chemical is used to ripen mangoes artificially?
A.
Sulphur Dioxide
B.
Nitrous Oxide
C.
Calcium Carbide
D.
Phosphorous
Ans:
Calcium Carbide
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
[16] 'Monazite' is an ore of -
A.
Sodium
B.
Titaniurm
C.
Thorium
D.
Zirconium
Ans:
Thorium
Explanation :
Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.
[17] The luster of a metal is due to -
A.
high polishing
B.
high density
C.
chemical inertness
D.
presence of free electrons
Ans:
presence of free electrons
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
[18] The depletion of Ozone layer is mainly due to –
A.
Volcanic eruptions
B.
Aviation fuels
C.
Radioactive rays
D.
Chlorofluorocarbons
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. Chloroiluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane.
[19] Glass is soluble in -
A.
H2SO4
B.
HCIO4
C.
HNO3
D.
HF
Ans:
HF
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.
[20] Acid rain is caused by -
A.
SO2 and particulates
B.
NO2 and particulates
C.
CO2 and CFCs
D.
SO2 and NO2
Ans:
SO2 and NO2
Explanation :
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
[21] What happens in a reduction reaction?
A.
addition of Oxygen
B.
addition of Nitrogen
C.
addition of Hydrogen
D.
None of the above
Ans:
addition of Hydrogen
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
In terms of Oxygen transfer, oxidation is gain of oxygen; reduction is loss of oxygen. However, in terms of hydrogen transfer, oxidation is loss of hydrogen, reduction is gain of hydrogen.
[22] The energy released at the end of digestion is in the form of:
A.
electric energy
B.
Kinetic energy
C.
thermal energy
D.
chemical energy
Ans:
chemical energy
Explanation :
Digestion of food involves both physical and chemical processes. During digestion the chemical energy in for released while the molecules of food are broken down into smaller pieces.
[23] The fuel in atomic pile is -
A.
carbon
B.
sodium
C.
petroleum
D.
uranium
Ans:
uranium
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
[24] The gas used for artificial ripening of green fruit is -
A.
Acetylene
B.
Ethylene
C.
Ethane
D.
Carbon dioxide
Ans:
Ethylene
Explanation :
Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening.
[25] A mixture of water and alcohol can be separated by –
A.
Filtration
B.
Evaporation
C.
Decantation
D.
Distillation
Ans:
Distillation
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.
Explanation :
A mixture of water and alcohol is separated by the process of distillation. At 780C, alcohol starts to vaporize. The vapours are condensed in the condenser and alcohol is collected in the receiver.