Wednesday, April 24, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

General Science MCQs for WBCS, SSC, RAIL, State PSC, UPSC P9

Physics - 09

41. The magnetic length of a bar magnet means
(A) It's width
(B) Its total length
(C) The distance of a pole from the center
(D) The distance between its two poles.

Correct Answer: [D] The distance between its two poles..
42. A shaving brush is dipped in water. When taken out the hairs of the brush are seen to be drawn together due to
(A) the elasticity of the hairs of the brush.
(B) the temperature difference between air and water.
(C) the surface tension of water.
(D) the viscosity of water.

Correct Answer: [C] the surface tension of water..
43. The viscosity of a liquid
(A) Independent of temperature.
(B) Decreases with increase in pressure.
(C) Increases with increase in temperature.
(D) Decreases with increase in temperature.

Correct Answer: [D] Decreases with increase in temperature..
44. How many times will the equivalent resistance of n identical conductors be changed if their parallel arrangement is changed into a series one
(A) n
(B) n2
(C) n3
(D) n4

Correct Answer: [B] n2.
45. The relative humidity inside a room is 50% while the temperature is 30°C. If the temperature becomes 40°C, then the relative humidity
(A) Will remain unchanged
(B) Will decrease
(C) Will increase
(D) Will increase or decrease depending upon the size of the room.

Correct Answer: [B] Will decrease.


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