Thursday, February 27, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

Physics mcq For UPSC | SSC | Rail | RRB | State PSC P22


Physics - 22

106. A small quantity of water is placed in a small cavity made in a block ice 0°C. What will happen to the water?
(A) The temperature of the water will decrease to 0°C but it will not freeze.
(B) The water will freeze to ice if the block of ice is large compared to the mass of water.
(C) The water will freeze to the ice at 0°C.
(D) There will be no change in the temperature of the water

Correct Answer: [A] The temperature of the water will decrease to 0°C but it will not freeze..
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107. Of the following which is different from the others?
(A) X-rays
(B) Thermal electrons
(C) Cathode rays
(D) Photoelectrons

Correct Answer: [A] X-rays.
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108. If a red light is used to illuminate a green leaf and a red flower, it will appear as
(A) Black leaf and red flower
(B) Black leaf and black flower
(C) Green leaf and red flower
(D) Red leaf and red flower

Correct Answer: [A] Black leaf and red flower.
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109. The specific resistance of a conductor depends on its
(A) Temperature
(B) The shape of the cross-section
(C) Length
(D) Width

Correct Answer: [A] Temperature.
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110. The material used for safety from nuclear radiation is
(A) Iron
(B) Lead
(C) Copper
(D) Platinum

Correct Answer: [B] Lead.
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