Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

WBCS Practice Set on General Science (Chemistry) P9


Chemistry - 09

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.

Correct Answer: [D] Dry ice..
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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.
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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.
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44. Aluminium powder mixed with linseed oil is used as
(A) Insecticide
(B) Explosive
(C) Paint
(D) Fertilizer.

Correct Answer: [C] Paint.
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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.
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