Thursday, February 27, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

quiz for class 10 science For UPSC | SSC | Rail | RRB | State PSC P26


Physics - 26

126. The temperature of two bodies being equal means
(A) Their heat capacities are the same
(B) Their specific heats are the same
(C) Their heat contents are the same
(D) When they are brought in contact there will be no exchange of heat

Correct Answer: [D] When they are brought in contact there will be no exchange of heat.
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127. 75% of a radioactive element decays in 6 hours. It's half-life period is
(A) 1/6 hours
(B) 3 hours
(C) 2 hours
(D) 4 hours

Correct Answer: [B] 3 hours.
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128. RADAR is based on the principle that
(A) Sound waves are reflected by an object
(B) Sound waves are a transverse wave
(C) Radio waves are reflected by objects
(D) Sound waves can travel in the air

Correct Answer: [C] Radio waves are reflected by objects.
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129. A magnifying glass or a simple microscope produces a
(A) Magnified virtual image.
(B) Diminished virtual image.
(C) Magnified real image.
(D) Virtual image near the eye, having the same size as the object

Correct Answer: [A] Magnified virtual image..
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130. 10 gm. of ice at 0°C is mixed with 10 gm. of water at 0°C. The temperature of the mixture will be
(A) 10°C
(B) 0°C
(C) 1°C
(D) 5°C

Correct Answer: [B] 0°C.
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