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.
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.
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..
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.
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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