Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

General Science (Chemistry) Previous Years Question of WBCS Prelims P4


Chemistry - 04

16. Radioactive decay of uranium produces
(A) Lead
(B) Tin
(C) Arsenic
(D) Bismuth.

Correct Answer: [A] Lead.
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17. Washing soda is the common name for
(A) Sodium bicarbonate
(B) Sodium hydroxide
(C) Sodium carbonate
(D) Calcium carbonate.

Correct Answer: [C] Sodium carbonate.
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18. In the process of vulcanization which two of the following are heated together?
(A) Rubber and Steel
(B) Rubber and Lead
(C) Rubber and Sulphur
(D) Latex and Sulphur.

Correct Answer: [D] Latex and Sulphur..
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19. When a liquid is heated from 20°C to 60°C, its density
(A) Decreases
(B) Is lost
(C) Remains the same
(D) Increases.

Correct Answer: [A] Decreases.
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20. Equal volumes of different gases at any definite temperature and pressure have
(A) equal density
(B) equal number of molecules
(C) equal weights
(D) equal masses.

Correct Answer: [B] equal number of molecules.
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