Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

Chemistry MCQs For WBCS Prelims P10

Chemistry - 10

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] Magnetizing a needle.


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