[1] Seaweeds are important source of –
A.
fluorine
B.
chlorine
C.
bromine
D.
iodine
Ans:
iodine
Explanation :
Seaweed is a source of iodine, necessary for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant.
[2] The resources which can be used continuously, year-after-year are called –
A.
Biotic
B.
Abiotic
C.
Non-renewable
D.
Renewable
Ans:
Renewable
Explanation :
A renewable resource is a natural resource with the ability to reproduce through biological or natural processes and replenished with the passage of time. Renewable resources are part of our natural environment and form our eco-system.
[3] Match sticks are made of -
A.
Red phosphorus
B.
blue phosphorus
C.
led nitrate
D.
None
Ans:
Red phosphorus
Explanation :
Red phosphorus is used in matches. Ferrophosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel.
[4] Newlands' table, the elements were placed with the halogens -
A.
Mn and As
B.
Fe and Se
C.
Ce and La
D.
Co and Ni
Ans:
Co and Ni
Explanation :
Newlands' Law of Octaves suffered from lot of limitations, In order to fit elements into his table, Newlands ad justed two elements in the same slot, but also put some unlike elements under the same note.
[5] Iron rusts quickly in –
A.
Rain water
B.
Sea water
C.
Distilled water
D.
River water
Ans:
Sea water
Explanation :
Water is the enabler of fast oxidation of iron. So freshwater will also cause rust. However, salt water (sea water) is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water. This effect can be reversed by using a metal (like zinc) which causes the current to be reversed and in effect the zinc corrodes rapidly, protecting the iron.
[6] Aerated water contains –
A.
SO2
B.
NO2
C.
NO2
D.
CO2
Ans:
CO2
Explanation :
Aerated water is, correctly speaking, water to which air is added. So aerated water is any water artificially impregnated with a large amount of has (as carbon dioxide). The term is, however, frequently applied to carbonated water.
[7] In electro-refining, the pure metal is deposited on –
A.
vessel
B.
electrolyte
C.
cathode
D.
anode
Ans:
cathode
Explanation :
In electro-refining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte the anodes are corroded into the solution so that the electroplating process deposits refined pure metal onto the cathodes. Electrolytic refining is used to extract impurities from crude metals.
[8] Natural rubber is a polymer of –
A.
Vinyl acetate
B.
Propene
C.
Isoprene
D.
Styrene
Ans:
Isoprene
Explanation :
Natural rubber consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Isoprene is produced and emitted by many species of trees into the atmosphere (major producers are oaks, poplars, eucalyptus, and some legumes).
[9] Which among the following is used as a catalyst in the production of high octane fuels?
A.
HNO3
B.
H2SO4
C.
HCl
D.
HF
Ans:
H2SO4
Explanation :
Sulfuric acid is used as a catalyst for refining and for producing alkylate, an essential component of high- octane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value.
[10] The effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as -
A.
Antagonism
B.
Independent
C.
Additive
D.
Synergism
Ans:
Antagonism
Explanation :
Synergy is the interaction of multiple elements in a system to produce an effect different from or greater than the sum of their individual effects. On the other hand, antagonism is the combined action of two or more substances to produce an effect less than the sum of their individual effects.
[11] Which metal is the heaviest in periodic table among the following?
A.
Os
B.
Pt
C.
Pb
D.
W
Ans:
Os
Explanation :
The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
[12] The chemical formula of the laughing gas is –
A.
NO
B.
N2O
C.
NO2
D.
N2O3
Ans:
N2O
Explanation :
Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is an oxide of nitrogen.
[13] Radioactive elements emit –
A.
Radiowaves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ radiations
Ans:
α, β and γ radiations
Explanation :
The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays.
[14] Which one out of the following helps in burning?
A.
Oxygen
B.
Carbon monoxide
C.
Nitrogen
D.
Carbon dioxide
Ans:
Oxygen
Explanation :
Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier.
[15] 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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
Seaweed is a source of iodine, necessary for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant.
[2] The resources which can be used continuously, year-after-year are called –
A.
Biotic
B.
Abiotic
C.
Non-renewable
D.
Renewable
Ans:
Renewable
Explanation :
A renewable resource is a natural resource with the ability to reproduce through biological or natural processes and replenished with the passage of time. Renewable resources are part of our natural environment and form our eco-system.
[3] Match sticks are made of -
A.
Red phosphorus
B.
blue phosphorus
C.
led nitrate
D.
None
Ans:
Red phosphorus
Explanation :
Red phosphorus is used in matches. Ferrophosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel.
[4] Newlands' table, the elements were placed with the halogens -
A.
Mn and As
B.
Fe and Se
C.
Ce and La
D.
Co and Ni
Ans:
Co and Ni
Explanation :
Newlands' Law of Octaves suffered from lot of limitations, In order to fit elements into his table, Newlands ad justed two elements in the same slot, but also put some unlike elements under the same note.
[5] Iron rusts quickly in –
A.
Rain water
B.
Sea water
C.
Distilled water
D.
River water
Ans:
Sea water
Explanation :
Water is the enabler of fast oxidation of iron. So freshwater will also cause rust. However, salt water (sea water) is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water. This effect can be reversed by using a metal (like zinc) which causes the current to be reversed and in effect the zinc corrodes rapidly, protecting the iron.
[6] Aerated water contains –
A.
SO2
B.
NO2
C.
NO2
D.
CO2
Ans:
CO2
Explanation :
Aerated water is, correctly speaking, water to which air is added. So aerated water is any water artificially impregnated with a large amount of has (as carbon dioxide). The term is, however, frequently applied to carbonated water.
[7] In electro-refining, the pure metal is deposited on –
A.
vessel
B.
electrolyte
C.
cathode
D.
anode
Ans:
cathode
Explanation :
In electro-refining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte the anodes are corroded into the solution so that the electroplating process deposits refined pure metal onto the cathodes. Electrolytic refining is used to extract impurities from crude metals.
[8] Natural rubber is a polymer of –
A.
Vinyl acetate
B.
Propene
C.
Isoprene
D.
Styrene
Ans:
Isoprene
Explanation :
Natural rubber consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Isoprene is produced and emitted by many species of trees into the atmosphere (major producers are oaks, poplars, eucalyptus, and some legumes).
[9] Which among the following is used as a catalyst in the production of high octane fuels?
A.
HNO3
B.
H2SO4
C.
HCl
D.
HF
Ans:
H2SO4
Explanation :
Sulfuric acid is used as a catalyst for refining and for producing alkylate, an essential component of high- octane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value.
[10] The effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as -
A.
Antagonism
B.
Independent
C.
Additive
D.
Synergism
Ans:
Antagonism
Explanation :
Synergy is the interaction of multiple elements in a system to produce an effect different from or greater than the sum of their individual effects. On the other hand, antagonism is the combined action of two or more substances to produce an effect less than the sum of their individual effects.
[11] Which metal is the heaviest in periodic table among the following?
A.
Os
B.
Pt
C.
Pb
D.
W
Ans:
Os
Explanation :
The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
[12] The chemical formula of the laughing gas is –
A.
NO
B.
N2O
C.
NO2
D.
N2O3
Ans:
N2O
Explanation :
Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is an oxide of nitrogen.
[13] Radioactive elements emit –
A.
Radiowaves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ radiations
Ans:
α, β and γ radiations
Explanation :
The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays.
[14] Which one out of the following helps in burning?
A.
Oxygen
B.
Carbon monoxide
C.
Nitrogen
D.
Carbon dioxide
Ans:
Oxygen
Explanation :
Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier.
[15] 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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
Red phosphorus is used in matches. Ferrophosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel.
[4] Newlands' table, the elements were placed with the halogens -
A.
Mn and As
B.
Fe and Se
C.
Ce and La
D.
Co and Ni
Ans:
Co and Ni
Explanation :
Newlands' Law of Octaves suffered from lot of limitations, In order to fit elements into his table, Newlands ad justed two elements in the same slot, but also put some unlike elements under the same note.
[5] Iron rusts quickly in –
A.
Rain water
B.
Sea water
C.
Distilled water
D.
River water
Ans:
Sea water
Explanation :
Water is the enabler of fast oxidation of iron. So freshwater will also cause rust. However, salt water (sea water) is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water. This effect can be reversed by using a metal (like zinc) which causes the current to be reversed and in effect the zinc corrodes rapidly, protecting the iron.
[6] Aerated water contains –
A.
SO2
B.
NO2
C.
NO2
D.
CO2
Ans:
CO2
Explanation :
Aerated water is, correctly speaking, water to which air is added. So aerated water is any water artificially impregnated with a large amount of has (as carbon dioxide). The term is, however, frequently applied to carbonated water.
[7] In electro-refining, the pure metal is deposited on –
A.
vessel
B.
electrolyte
C.
cathode
D.
anode
Ans:
cathode
Explanation :
In electro-refining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte the anodes are corroded into the solution so that the electroplating process deposits refined pure metal onto the cathodes. Electrolytic refining is used to extract impurities from crude metals.
[8] Natural rubber is a polymer of –
A.
Vinyl acetate
B.
Propene
C.
Isoprene
D.
Styrene
Ans:
Isoprene
Explanation :
Natural rubber consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Isoprene is produced and emitted by many species of trees into the atmosphere (major producers are oaks, poplars, eucalyptus, and some legumes).
[9] Which among the following is used as a catalyst in the production of high octane fuels?
A.
HNO3
B.
H2SO4
C.
HCl
D.
HF
Ans:
H2SO4
Explanation :
Sulfuric acid is used as a catalyst for refining and for producing alkylate, an essential component of high- octane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value.
[10] The effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as -
A.
Antagonism
B.
Independent
C.
Additive
D.
Synergism
Ans:
Antagonism
Explanation :
Synergy is the interaction of multiple elements in a system to produce an effect different from or greater than the sum of their individual effects. On the other hand, antagonism is the combined action of two or more substances to produce an effect less than the sum of their individual effects.
[11] Which metal is the heaviest in periodic table among the following?
A.
Os
B.
Pt
C.
Pb
D.
W
Ans:
Os
Explanation :
The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
[12] The chemical formula of the laughing gas is –
A.
NO
B.
N2O
C.
NO2
D.
N2O3
Ans:
N2O
Explanation :
Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is an oxide of nitrogen.
[13] Radioactive elements emit –
A.
Radiowaves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ radiations
Ans:
α, β and γ radiations
Explanation :
The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays.
[14] Which one out of the following helps in burning?
A.
Oxygen
B.
Carbon monoxide
C.
Nitrogen
D.
Carbon dioxide
Ans:
Oxygen
Explanation :
Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier.
[15] 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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
Water is the enabler of fast oxidation of iron. So freshwater will also cause rust. However, salt water (sea water) is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water. This effect can be reversed by using a metal (like zinc) which causes the current to be reversed and in effect the zinc corrodes rapidly, protecting the iron.
[6] Aerated water contains –
A.
SO2
B.
NO2
C.
NO2
D.
CO2
Ans:
CO2
Explanation :
Aerated water is, correctly speaking, water to which air is added. So aerated water is any water artificially impregnated with a large amount of has (as carbon dioxide). The term is, however, frequently applied to carbonated water.
[7] In electro-refining, the pure metal is deposited on –
A.
vessel
B.
electrolyte
C.
cathode
D.
anode
Ans:
cathode
Explanation :
In electro-refining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte the anodes are corroded into the solution so that the electroplating process deposits refined pure metal onto the cathodes. Electrolytic refining is used to extract impurities from crude metals.
[8] Natural rubber is a polymer of –
A.
Vinyl acetate
B.
Propene
C.
Isoprene
D.
Styrene
Ans:
Isoprene
Explanation :
Natural rubber consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Isoprene is produced and emitted by many species of trees into the atmosphere (major producers are oaks, poplars, eucalyptus, and some legumes).
[9] Which among the following is used as a catalyst in the production of high octane fuels?
A.
HNO3
B.
H2SO4
C.
HCl
D.
HF
Ans:
H2SO4
Explanation :
Sulfuric acid is used as a catalyst for refining and for producing alkylate, an essential component of high- octane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value.
[10] The effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as -
A.
Antagonism
B.
Independent
C.
Additive
D.
Synergism
Ans:
Antagonism
Explanation :
Synergy is the interaction of multiple elements in a system to produce an effect different from or greater than the sum of their individual effects. On the other hand, antagonism is the combined action of two or more substances to produce an effect less than the sum of their individual effects.
[11] Which metal is the heaviest in periodic table among the following?
A.
Os
B.
Pt
C.
Pb
D.
W
Ans:
Os
Explanation :
The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
[12] The chemical formula of the laughing gas is –
A.
NO
B.
N2O
C.
NO2
D.
N2O3
Ans:
N2O
Explanation :
Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is an oxide of nitrogen.
[13] Radioactive elements emit –
A.
Radiowaves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ radiations
Ans:
α, β and γ radiations
Explanation :
The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays.
[14] Which one out of the following helps in burning?
A.
Oxygen
B.
Carbon monoxide
C.
Nitrogen
D.
Carbon dioxide
Ans:
Oxygen
Explanation :
Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier.
[15] 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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
In electro-refining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte the anodes are corroded into the solution so that the electroplating process deposits refined pure metal onto the cathodes. Electrolytic refining is used to extract impurities from crude metals.
[8] Natural rubber is a polymer of –
A.
Vinyl acetate
B.
Propene
C.
Isoprene
D.
Styrene
Ans:
Isoprene
Explanation :
Natural rubber consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Isoprene is produced and emitted by many species of trees into the atmosphere (major producers are oaks, poplars, eucalyptus, and some legumes).
[9] Which among the following is used as a catalyst in the production of high octane fuels?
A.
HNO3
B.
H2SO4
C.
HCl
D.
HF
Ans:
H2SO4
Explanation :
Sulfuric acid is used as a catalyst for refining and for producing alkylate, an essential component of high- octane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value.
[10] The effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as -
A.
Antagonism
B.
Independent
C.
Additive
D.
Synergism
Ans:
Antagonism
Explanation :
Synergy is the interaction of multiple elements in a system to produce an effect different from or greater than the sum of their individual effects. On the other hand, antagonism is the combined action of two or more substances to produce an effect less than the sum of their individual effects.
[11] Which metal is the heaviest in periodic table among the following?
A.
Os
B.
Pt
C.
Pb
D.
W
Ans:
Os
Explanation :
The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
[12] The chemical formula of the laughing gas is –
A.
NO
B.
N2O
C.
NO2
D.
N2O3
Ans:
N2O
Explanation :
Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is an oxide of nitrogen.
[13] Radioactive elements emit –
A.
Radiowaves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ radiations
Ans:
α, β and γ radiations
Explanation :
The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays.
[14] Which one out of the following helps in burning?
A.
Oxygen
B.
Carbon monoxide
C.
Nitrogen
D.
Carbon dioxide
Ans:
Oxygen
Explanation :
Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier.
[15] 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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
Sulfuric acid is used as a catalyst for refining and for producing alkylate, an essential component of high- octane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value.
[10] The effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as -
A.
Antagonism
B.
Independent
C.
Additive
D.
Synergism
Ans:
Antagonism
Explanation :
Synergy is the interaction of multiple elements in a system to produce an effect different from or greater than the sum of their individual effects. On the other hand, antagonism is the combined action of two or more substances to produce an effect less than the sum of their individual effects.
[11] Which metal is the heaviest in periodic table among the following?
A.
Os
B.
Pt
C.
Pb
D.
W
Ans:
Os
Explanation :
The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
[12] The chemical formula of the laughing gas is –
A.
NO
B.
N2O
C.
NO2
D.
N2O3
Ans:
N2O
Explanation :
Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is an oxide of nitrogen.
[13] Radioactive elements emit –
A.
Radiowaves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ radiations
Ans:
α, β and γ radiations
Explanation :
The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays.
[14] Which one out of the following helps in burning?
A.
Oxygen
B.
Carbon monoxide
C.
Nitrogen
D.
Carbon dioxide
Ans:
Oxygen
Explanation :
Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier.
[15] 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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
[12] The chemical formula of the laughing gas is –
A.
NO
B.
N2O
C.
NO2
D.
N2O3
Ans:
N2O
Explanation :
Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is an oxide of nitrogen.
[13] Radioactive elements emit –
A.
Radiowaves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ radiations
Ans:
α, β and γ radiations
Explanation :
The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays.
[14] Which one out of the following helps in burning?
A.
Oxygen
B.
Carbon monoxide
C.
Nitrogen
D.
Carbon dioxide
Ans:
Oxygen
Explanation :
Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier.
[15] 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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays.
[14] Which one out of the following helps in burning?
A.
Oxygen
B.
Carbon monoxide
C.
Nitrogen
D.
Carbon dioxide
Ans:
Oxygen
Explanation :
Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier.
[15] 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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
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.
[16] Which one of the following is a mixture of carbon monoxide and hydrogen?
A.
coal gas
B.
producer gas
C.
water gas
D.
gobar gas
Ans:
water gas
Explanation :
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue).
[17] Which of the following elements has the lowest melting point?
A.
Bromine
B.
Zinc
C.
Calcium
D.
Lead
Ans:
Bromine
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.
[18] 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.
[19] The percentage of carbon in cost iron is :
A.
0.01 to 0.25
B.
0.5 to 1.5
C.
6 to 3
D.
3 to 5
Ans:
3 to 5
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
[20] The compound that has the least value for octane number is –
A.
2-methyl heptane
B.
Iso-octane
C.
2,2-dimethyl hexane
D.
n-heptane
Ans:
n-heptane
Explanation :
Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.
[21] Which of the following is a correct pair according to increasing atomic number from left to right?
A.
Ca, Cl
B.
Be, B
C.
Na, Ne
D.
He, H
Ans:
Be, B
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (B) is 5.
[22] The gas causing acid rain in an industrial area is -
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulphur dioxide
D.
Methane
Ans:
Sulphur dioxide
Explanation :
The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal-fired power stations whereas nitrous oxide is from vehicles and fuel combustion.
[23] Which one of the following has greatest mass?
A.
electron
B.
proton
C.
neutron
D.
hydrogen nucleus
Ans:
neutron
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
Mass of proton is 1.672621777(74) × 10-27 kg. An electron has a mass 9.10938291(40) ×10-31 kg that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10-27 kg. The heaviest of these particles is the neutron.
[24] A colloidal system in which a liquid is dispersed in a liquid is called –
A.
gel
B.
emulsion
C.
sol
D.
precipitate
Ans:
emulsion
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working.
[25] When a lead storage battery is discharged -
A.
SO2 is evolved
B.
Lead sulphate is consumed
C.
Lead is formed
D.
Sulphuric acid is consumed
Ans:
Sulphuric acid is consumed
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.
Explanation :
Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water.