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..
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.


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