[1] Which of the following is the lightest metal?
A.
Mercury
B.
Silver
C.
Lithium
D.
Lead
Ans:
Lithium
Explanation :
The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.
[2] Fuse wire is made of an alloy of .
A.
Lead and Copper
B.
Tin and Copper
C.
Tin and Lead
D.
Copper and Silver
Ans:
Tin and Lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[3] Bleaching action of chlorine is by -
A.
Decomposition
B.
hydrolysis
C.
reduction
D.
oxidation
Ans:
oxidation
Explanation :
Chlorine bleaches by the process of oxidation. It needs moisture for its bleaching action. Chlorine reacts with water to form hydrochloric and hypochlorous acids.
[4] The nuclear particle having no mass and no charge, but only spin is -
A.
proton
B.
neutrino
C.
meson
D.
electron
Ans:
neutrino
Explanation :
Neutrinos do not carry electric charge, and have mass quite small, though non-zero. Their mass is tiny even by the standards of subatomic particles. They are electrically neutral, weakly interacting elementary subatomic particles with half-integer spin.
[5] In a period from Li to F, ionisation potential –
A.
cannot be predicted
B.
increases
C.
decreases
D.
remains same
Ans:
cannot be predicted
Explanation :
Ionization energy increases along a period with increase in atomic number. However, in the periodic table, going from left to right, while the IQnization Potential of Li is 5.4 eV, that of Be: 9.3 eV, B: 8.3 eV, C: 11.3 eV, N: 14.6 eV, 0: 13.6 eV, and F: 17.0 eV.
[6] A nibble is equal to –
A.
32
B.
4
C.
8
D.
16
Ans:
4
Explanation :
In computing, a nibble is a four-bit aggregation, or half an octet. A nibble contains 4 bits.
[7] The non-metal found in the liquid state is –
A.
bromine
B.
nitrogen
C.
fluorine
D.
chlorine
Ans:
bromine
Explanation :
Bromine belongs to the halogen group. It is the only non-metal element that is in a liquid form at room temperature. At room temperature it is a reddish brown fuming liquid with an unpleasant chlorine like smell.
[8] Which of the following metals does NOT react with oxygen even at a high temperature?
A.
Aluminium
B.
Silver
C.
Lead
D.
line
Ans:
Silver
Explanation :
Silver and gold do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series.
[9] Acetic acid is know as -
A.
Caustic soda
B.
Spirit
C.
Baking soda
D.
Vinegar
Ans:
Vinegar
Explanation :
Acetic acid (CH3COOH) also called ethanoic acid, the most important of the carboxylic acids. Vinegar is roughly 3-9% acetic acid by volume making acetic acid the main component of vinegar apart from water.
[10] Which of the following gas is used in cigarette lighters?
A.
Butane
B.
Propane
C.
Methane
D.
Ethane
Ans:
Butane
Explanation :
Butane, a highly flammable, colorless, easily liquefied gas used in gas-type lighters and butane torches. Naphtha, a volatile flammable liquid hydrocarbon mixture used in wick-type lighters and burners.
[11] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Heavy water
D.
Hydrogen peroxide
Ans:
Heavy water
Explanation :
Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium- 238
[12] The chemical name of baking soda is -
A.
Sodium carbonate
B.
Sodium bicarbonate
C.
Sodium chloride
D.
Sodium nitrate
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'.
[13] Chemical name of common salt is –
A.
Sodium Chloride
B.
Sodium Bicarbonate
C.
Sodium
D.
Sodium Oxide
Ans:
Sodium Chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative.
[14] Nitrogen in water is commonly found in the form of -
A.
Nitrous oxide
B.
Nitrate
C.
Nitric oxide
D.
Nitrite
Ans:
Nitrate
Explanation :
Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).
[15] Chemical name of Gammaxane is -
A.
Toluene
B.
Chloro benzene
C.
Aniline
D.
Benzene hexachloride
Ans:
Benzene hexachloride
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.
[2] Fuse wire is made of an alloy of .
A.
Lead and Copper
B.
Tin and Copper
C.
Tin and Lead
D.
Copper and Silver
Ans:
Tin and Lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[3] Bleaching action of chlorine is by -
A.
Decomposition
B.
hydrolysis
C.
reduction
D.
oxidation
Ans:
oxidation
Explanation :
Chlorine bleaches by the process of oxidation. It needs moisture for its bleaching action. Chlorine reacts with water to form hydrochloric and hypochlorous acids.
[4] The nuclear particle having no mass and no charge, but only spin is -
A.
proton
B.
neutrino
C.
meson
D.
electron
Ans:
neutrino
Explanation :
Neutrinos do not carry electric charge, and have mass quite small, though non-zero. Their mass is tiny even by the standards of subatomic particles. They are electrically neutral, weakly interacting elementary subatomic particles with half-integer spin.
[5] In a period from Li to F, ionisation potential –
A.
cannot be predicted
B.
increases
C.
decreases
D.
remains same
Ans:
cannot be predicted
Explanation :
Ionization energy increases along a period with increase in atomic number. However, in the periodic table, going from left to right, while the IQnization Potential of Li is 5.4 eV, that of Be: 9.3 eV, B: 8.3 eV, C: 11.3 eV, N: 14.6 eV, 0: 13.6 eV, and F: 17.0 eV.
[6] A nibble is equal to –
A.
32
B.
4
C.
8
D.
16
Ans:
4
Explanation :
In computing, a nibble is a four-bit aggregation, or half an octet. A nibble contains 4 bits.
[7] The non-metal found in the liquid state is –
A.
bromine
B.
nitrogen
C.
fluorine
D.
chlorine
Ans:
bromine
Explanation :
Bromine belongs to the halogen group. It is the only non-metal element that is in a liquid form at room temperature. At room temperature it is a reddish brown fuming liquid with an unpleasant chlorine like smell.
[8] Which of the following metals does NOT react with oxygen even at a high temperature?
A.
Aluminium
B.
Silver
C.
Lead
D.
line
Ans:
Silver
Explanation :
Silver and gold do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series.
[9] Acetic acid is know as -
A.
Caustic soda
B.
Spirit
C.
Baking soda
D.
Vinegar
Ans:
Vinegar
Explanation :
Acetic acid (CH3COOH) also called ethanoic acid, the most important of the carboxylic acids. Vinegar is roughly 3-9% acetic acid by volume making acetic acid the main component of vinegar apart from water.
[10] Which of the following gas is used in cigarette lighters?
A.
Butane
B.
Propane
C.
Methane
D.
Ethane
Ans:
Butane
Explanation :
Butane, a highly flammable, colorless, easily liquefied gas used in gas-type lighters and butane torches. Naphtha, a volatile flammable liquid hydrocarbon mixture used in wick-type lighters and burners.
[11] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Heavy water
D.
Hydrogen peroxide
Ans:
Heavy water
Explanation :
Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium- 238
[12] The chemical name of baking soda is -
A.
Sodium carbonate
B.
Sodium bicarbonate
C.
Sodium chloride
D.
Sodium nitrate
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'.
[13] Chemical name of common salt is –
A.
Sodium Chloride
B.
Sodium Bicarbonate
C.
Sodium
D.
Sodium Oxide
Ans:
Sodium Chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative.
[14] Nitrogen in water is commonly found in the form of -
A.
Nitrous oxide
B.
Nitrate
C.
Nitric oxide
D.
Nitrite
Ans:
Nitrate
Explanation :
Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).
[15] Chemical name of Gammaxane is -
A.
Toluene
B.
Chloro benzene
C.
Aniline
D.
Benzene hexachloride
Ans:
Benzene hexachloride
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Chlorine bleaches by the process of oxidation. It needs moisture for its bleaching action. Chlorine reacts with water to form hydrochloric and hypochlorous acids.
[4] The nuclear particle having no mass and no charge, but only spin is -
A.
proton
B.
neutrino
C.
meson
D.
electron
Ans:
neutrino
Explanation :
Neutrinos do not carry electric charge, and have mass quite small, though non-zero. Their mass is tiny even by the standards of subatomic particles. They are electrically neutral, weakly interacting elementary subatomic particles with half-integer spin.
[5] In a period from Li to F, ionisation potential –
A.
cannot be predicted
B.
increases
C.
decreases
D.
remains same
Ans:
cannot be predicted
Explanation :
Ionization energy increases along a period with increase in atomic number. However, in the periodic table, going from left to right, while the IQnization Potential of Li is 5.4 eV, that of Be: 9.3 eV, B: 8.3 eV, C: 11.3 eV, N: 14.6 eV, 0: 13.6 eV, and F: 17.0 eV.
[6] A nibble is equal to –
A.
32
B.
4
C.
8
D.
16
Ans:
4
Explanation :
In computing, a nibble is a four-bit aggregation, or half an octet. A nibble contains 4 bits.
[7] The non-metal found in the liquid state is –
A.
bromine
B.
nitrogen
C.
fluorine
D.
chlorine
Ans:
bromine
Explanation :
Bromine belongs to the halogen group. It is the only non-metal element that is in a liquid form at room temperature. At room temperature it is a reddish brown fuming liquid with an unpleasant chlorine like smell.
[8] Which of the following metals does NOT react with oxygen even at a high temperature?
A.
Aluminium
B.
Silver
C.
Lead
D.
line
Ans:
Silver
Explanation :
Silver and gold do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series.
[9] Acetic acid is know as -
A.
Caustic soda
B.
Spirit
C.
Baking soda
D.
Vinegar
Ans:
Vinegar
Explanation :
Acetic acid (CH3COOH) also called ethanoic acid, the most important of the carboxylic acids. Vinegar is roughly 3-9% acetic acid by volume making acetic acid the main component of vinegar apart from water.
[10] Which of the following gas is used in cigarette lighters?
A.
Butane
B.
Propane
C.
Methane
D.
Ethane
Ans:
Butane
Explanation :
Butane, a highly flammable, colorless, easily liquefied gas used in gas-type lighters and butane torches. Naphtha, a volatile flammable liquid hydrocarbon mixture used in wick-type lighters and burners.
[11] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Heavy water
D.
Hydrogen peroxide
Ans:
Heavy water
Explanation :
Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium- 238
[12] The chemical name of baking soda is -
A.
Sodium carbonate
B.
Sodium bicarbonate
C.
Sodium chloride
D.
Sodium nitrate
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'.
[13] Chemical name of common salt is –
A.
Sodium Chloride
B.
Sodium Bicarbonate
C.
Sodium
D.
Sodium Oxide
Ans:
Sodium Chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative.
[14] Nitrogen in water is commonly found in the form of -
A.
Nitrous oxide
B.
Nitrate
C.
Nitric oxide
D.
Nitrite
Ans:
Nitrate
Explanation :
Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).
[15] Chemical name of Gammaxane is -
A.
Toluene
B.
Chloro benzene
C.
Aniline
D.
Benzene hexachloride
Ans:
Benzene hexachloride
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Ionization energy increases along a period with increase in atomic number. However, in the periodic table, going from left to right, while the IQnization Potential of Li is 5.4 eV, that of Be: 9.3 eV, B: 8.3 eV, C: 11.3 eV, N: 14.6 eV, 0: 13.6 eV, and F: 17.0 eV.
[6] A nibble is equal to –
A.
32
B.
4
C.
8
D.
16
Ans:
4
Explanation :
In computing, a nibble is a four-bit aggregation, or half an octet. A nibble contains 4 bits.
[7] The non-metal found in the liquid state is –
A.
bromine
B.
nitrogen
C.
fluorine
D.
chlorine
Ans:
bromine
Explanation :
Bromine belongs to the halogen group. It is the only non-metal element that is in a liquid form at room temperature. At room temperature it is a reddish brown fuming liquid with an unpleasant chlorine like smell.
[8] Which of the following metals does NOT react with oxygen even at a high temperature?
A.
Aluminium
B.
Silver
C.
Lead
D.
line
Ans:
Silver
Explanation :
Silver and gold do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series.
[9] Acetic acid is know as -
A.
Caustic soda
B.
Spirit
C.
Baking soda
D.
Vinegar
Ans:
Vinegar
Explanation :
Acetic acid (CH3COOH) also called ethanoic acid, the most important of the carboxylic acids. Vinegar is roughly 3-9% acetic acid by volume making acetic acid the main component of vinegar apart from water.
[10] Which of the following gas is used in cigarette lighters?
A.
Butane
B.
Propane
C.
Methane
D.
Ethane
Ans:
Butane
Explanation :
Butane, a highly flammable, colorless, easily liquefied gas used in gas-type lighters and butane torches. Naphtha, a volatile flammable liquid hydrocarbon mixture used in wick-type lighters and burners.
[11] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Heavy water
D.
Hydrogen peroxide
Ans:
Heavy water
Explanation :
Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium- 238
[12] The chemical name of baking soda is -
A.
Sodium carbonate
B.
Sodium bicarbonate
C.
Sodium chloride
D.
Sodium nitrate
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'.
[13] Chemical name of common salt is –
A.
Sodium Chloride
B.
Sodium Bicarbonate
C.
Sodium
D.
Sodium Oxide
Ans:
Sodium Chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative.
[14] Nitrogen in water is commonly found in the form of -
A.
Nitrous oxide
B.
Nitrate
C.
Nitric oxide
D.
Nitrite
Ans:
Nitrate
Explanation :
Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).
[15] Chemical name of Gammaxane is -
A.
Toluene
B.
Chloro benzene
C.
Aniline
D.
Benzene hexachloride
Ans:
Benzene hexachloride
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Bromine belongs to the halogen group. It is the only non-metal element that is in a liquid form at room temperature. At room temperature it is a reddish brown fuming liquid with an unpleasant chlorine like smell.
[8] Which of the following metals does NOT react with oxygen even at a high temperature?
A.
Aluminium
B.
Silver
C.
Lead
D.
line
Ans:
Silver
Explanation :
Silver and gold do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series.
[9] Acetic acid is know as -
A.
Caustic soda
B.
Spirit
C.
Baking soda
D.
Vinegar
Ans:
Vinegar
Explanation :
Acetic acid (CH3COOH) also called ethanoic acid, the most important of the carboxylic acids. Vinegar is roughly 3-9% acetic acid by volume making acetic acid the main component of vinegar apart from water.
[10] Which of the following gas is used in cigarette lighters?
A.
Butane
B.
Propane
C.
Methane
D.
Ethane
Ans:
Butane
Explanation :
Butane, a highly flammable, colorless, easily liquefied gas used in gas-type lighters and butane torches. Naphtha, a volatile flammable liquid hydrocarbon mixture used in wick-type lighters and burners.
[11] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Heavy water
D.
Hydrogen peroxide
Ans:
Heavy water
Explanation :
Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium- 238
[12] The chemical name of baking soda is -
A.
Sodium carbonate
B.
Sodium bicarbonate
C.
Sodium chloride
D.
Sodium nitrate
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'.
[13] Chemical name of common salt is –
A.
Sodium Chloride
B.
Sodium Bicarbonate
C.
Sodium
D.
Sodium Oxide
Ans:
Sodium Chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative.
[14] Nitrogen in water is commonly found in the form of -
A.
Nitrous oxide
B.
Nitrate
C.
Nitric oxide
D.
Nitrite
Ans:
Nitrate
Explanation :
Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).
[15] Chemical name of Gammaxane is -
A.
Toluene
B.
Chloro benzene
C.
Aniline
D.
Benzene hexachloride
Ans:
Benzene hexachloride
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Acetic acid (CH3COOH) also called ethanoic acid, the most important of the carboxylic acids. Vinegar is roughly 3-9% acetic acid by volume making acetic acid the main component of vinegar apart from water.
[10] Which of the following gas is used in cigarette lighters?
A.
Butane
B.
Propane
C.
Methane
D.
Ethane
Ans:
Butane
Explanation :
Butane, a highly flammable, colorless, easily liquefied gas used in gas-type lighters and butane torches. Naphtha, a volatile flammable liquid hydrocarbon mixture used in wick-type lighters and burners.
[11] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Heavy water
D.
Hydrogen peroxide
Ans:
Heavy water
Explanation :
Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium- 238
[12] The chemical name of baking soda is -
A.
Sodium carbonate
B.
Sodium bicarbonate
C.
Sodium chloride
D.
Sodium nitrate
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'.
[13] Chemical name of common salt is –
A.
Sodium Chloride
B.
Sodium Bicarbonate
C.
Sodium
D.
Sodium Oxide
Ans:
Sodium Chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative.
[14] Nitrogen in water is commonly found in the form of -
A.
Nitrous oxide
B.
Nitrate
C.
Nitric oxide
D.
Nitrite
Ans:
Nitrate
Explanation :
Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).
[15] Chemical name of Gammaxane is -
A.
Toluene
B.
Chloro benzene
C.
Aniline
D.
Benzene hexachloride
Ans:
Benzene hexachloride
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium- 238
[12] The chemical name of baking soda is -
A.
Sodium carbonate
B.
Sodium bicarbonate
C.
Sodium chloride
D.
Sodium nitrate
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'.
[13] Chemical name of common salt is –
A.
Sodium Chloride
B.
Sodium Bicarbonate
C.
Sodium
D.
Sodium Oxide
Ans:
Sodium Chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative.
[14] Nitrogen in water is commonly found in the form of -
A.
Nitrous oxide
B.
Nitrate
C.
Nitric oxide
D.
Nitrite
Ans:
Nitrate
Explanation :
Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).
[15] Chemical name of Gammaxane is -
A.
Toluene
B.
Chloro benzene
C.
Aniline
D.
Benzene hexachloride
Ans:
Benzene hexachloride
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative.
[14] Nitrogen in water is commonly found in the form of -
A.
Nitrous oxide
B.
Nitrate
C.
Nitric oxide
D.
Nitrite
Ans:
Nitrate
Explanation :
Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).
[15] Chemical name of Gammaxane is -
A.
Toluene
B.
Chloro benzene
C.
Aniline
D.
Benzene hexachloride
Ans:
Benzene hexachloride
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene.
[16] The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
A.
Acetic acid
B.
Formic acid
C.
Carbonic acid
D.
Sulphuric acid
Ans:
Sulphuric acid
Explanation :
Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide.
[17] Which one of the following is not coal variety?
A.
Lignite
B.
Bituminous
C.
Dolomite
D.
Peat
Ans:
Dolomite
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical com- position of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium.
[18] Which of the following is the strongest base in aqueous solution?
A.
Diethylamine
B.
Triethylamine
C.
Ammonia
D.
Ethylamine
Ans:
Diethylamine
Explanation :
Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia.
[19] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
A.
Xenon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
[20] Which of the following substance’s smell is similar to Ethanoic acid?
A.
Tomatojuice
B.
Kerosene
C.
Vinegar
D.
Lemon
Ans:
Vinegar
Explanation :
Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
[21] A powerful eye irritant present in smog is –
A.
nitric oxide
B.
sulphur dioxide
C.
peroxyacetyl nitrate
D.
carbon dioxide
Ans:
peroxyacetyl nitrate
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.
[22] The most important ore of lead is –
A.
Galena
B.
Magnetite
C.
Pyrolusite
D.
Siderite
Ans:
Galena
Explanation :
Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
[23] The gas used to dilute oxygen for breathing by deep sea divers is-
A.
Neon
B.
Argon
C.
Nitrogen
D.
Helium
Ans:
Helium
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired).
[24] The chemical substance present in bones and teeth is -
A.
Calcium phosphate
B.
Calcium chloride
C.
Calcium sulphate
D.
Calcium borate
Ans:
Calcium phosphate
Explanation :
Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral. (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.
[25] Maximum permissible concentration of copper in drinking water in mg/L is -
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
Explanation :
In the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.