41. Artificial rain is caused by spraying small pellets of which of the following over clouds?
(A) NaOH
(B) NH4Cl
(C) Ice
(D) Dry ice
42. The term PVC used in the plastic industry stands for
(A) Poly Vinyl Chloride
(B) Phospho Vanadium Chloride
(C) Phospho Vinyl Chloride
(D) Poly Vinyl Carbonate
43. Which among the following is responsible for the depletion of the Ozone layer?
(A) Chlorofluorocarbon
(B) Mercuric oxide
(C) Carbon monoxide
(D) Carbon dioxide
44. Aluminium powder mixed with linseed oil is used as
(A) Insecticide
(B) Explosive
(C) Paint
(D) Fertilizer
45. The half-life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
(A) 1/8
(B) 1/4
(C) 1/6
(D) 1/3
46. Nuclei of radioactive elements emit
(A) Either protons or neutrons
(B) Neither protons nor neutrons
(C) Neutrons
(D) Protons
47. L.P.G. Cylinders contain inside
(A) Isobutane and Propane
(B) Butane, Isobutane, and Propane
(C) Butane and Isobutane
(D) Butane and Propane
48. Which one of the following is an element?
(A) Graphite
(B) Glass
(C) Table salt
(D) Water
49. At constant temperature, if the pressure decrease, then the volume of a given mass of gas will
(A) Remain constant
(B) May increase or decrease depending on the nature of the gas
(C) Increase
(D) Decrease
50. Which of the following is physical change?
(A) Magnetizing a needle
(B) Rusting of iron
(C) Radioactive decay
(D) Photosynthesis
(A) NaOH
(B) NH4Cl
(C) Ice
(D) Dry ice
Correct Answer: [D] Dry ice.
42. The term PVC used in the plastic industry stands for
(A) Poly Vinyl Chloride
(B) Phospho Vanadium Chloride
(C) Phospho Vinyl Chloride
(D) Poly Vinyl Carbonate
Correct Answer: [A] Poly Vinyl Chloride.
43. Which among the following is responsible for the depletion of the Ozone layer?
(A) Chlorofluorocarbon
(B) Mercuric oxide
(C) Carbon monoxide
(D) Carbon dioxide
Correct Answer: [A] Chlorofluorocarbon.
44. Aluminium powder mixed with linseed oil is used as
(A) Insecticide
(B) Explosive
(C) Paint
(D) Fertilizer
Correct Answer: [C] Paint.
45. The half-life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
(A) 1/8
(B) 1/4
(C) 1/6
(D) 1/3
Correct Answer: [A] 1/8.
46. Nuclei of radioactive elements emit
(A) Either protons or neutrons
(B) Neither protons nor neutrons
(C) Neutrons
(D) Protons
Correct Answer: [B] Neither protons nor neutrons.
47. L.P.G. Cylinders contain inside
(A) Isobutane and Propane
(B) Butane, Isobutane, and Propane
(C) Butane and Isobutane
(D) Butane and Propane
Correct Answer: [B] Butane, Isobutane, and Propane.
48. Which one of the following is an element?
(A) Graphite
(B) Glass
(C) Table salt
(D) Water
Correct Answer: [A] Graphite.
49. At constant temperature, if the pressure decrease, then the volume of a given mass of gas will
(A) Remain constant
(B) May increase or decrease depending on the nature of the gas
(C) Increase
(D) Decrease
Correct Answer: [C] Increase.
50. Which of the following is physical change?
(A) Magnetizing a needle
(B) Rusting of iron
(C) Radioactive decay
(D) Photosynthesis
Correct Answer: [A] Magnetising a needle.
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