Thursday, February 27, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

Physics questions and answers For UPSC | SSC | Rail | RRB | State PSC | neet P29


Physics - 29

141. The primary colors of light are.
(A) Yellow, Blue, Red, Grey.
(B) None of the above.
(C) Red, Green, Blue, Yellow.
(D) Red, Blue, Green

Correct Answer: [D] Red, Blue, Green.
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142. Instruments can be shielded from the effects of external magnetic fields by surrounding them with
(A) A brass shield
(B) An iron shield
(C) A glass shield
(D) A rubber shield

Correct Answer: [B] An iron shield.
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143. The electromagnetic radiation that is emitted during radio-active disintegration is
(A) Ultraviolet rays
(B) Infra-red rays
(C) X-rays
(D) γ-rays (Gamma Rays

Correct Answer: [D] γ-rays (Gamma Rays.
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144. Magnetism at the center of a bar magnet is
(A) Zero
(B) Maximum
(C) Minimum
(D) Minimum or maximum

Correct Answer: [A] Zero.
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145. The resistance of a 200V - 100W bulb is
(A) 2
(B) 400
(C) 400 when it is not glowing.
(D) 400 only when it is connected to 200-volt mains

Correct Answer: [D] 400 only when it is connected to 200-volt mains.
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