Wednesday, April 24, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

PSC Online Preparations of General Science (Physics) P15


Physics - 15

71. If the density of air is 1.30 g/lit., what is the volume occupied by 7.8 g of air?
(A) 6.5 lit.
(B) 10.10 lit.
(C) 10 lit.
(D) 6 lit

Correct Answer: [D] 6 lit.
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72. Which of the following metals is the best conductor of heat and electricity
(A) Silver
(B) Potassium
(C) Sodium
(D) Copper

Correct Answer: [A] Silver.
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73. The kinetic energy of molecules is highest in
(A) Liquids
(B) Solutions
(C) Gases
(D) Solids

Correct Answer: [C] Gases.
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74. When loaded and empty trucks of identical specifications, are moving with the same velocity, more force is required to stop the loaded truck. Which of the following Laws is proved by this action?
(A) Newton's third law of motion
(B) Gravitational law
(C) Newton's first law of motion
(D) Newton's second law of motion

Correct Answer: [D] Newton's second law of motion.
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75. Which one of the following is the weakest force?
(A) Gravitational force
(B) Electrostatic force
(C) Nuclear force
(D) Electromagnetic force

Correct Answer: [A] Gravitational force.
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