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
(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.
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
(A) A brass shield
(B) An iron shield
(C) A glass shield
(D) A rubber shield
Correct Answer: [B] An iron shield.
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
(A) Ultraviolet rays
(B) Infra-red rays
(C) X-rays
(D) γ-rays (Gamma Rays
Correct Answer: [D] γ-rays (Gamma Rays.
144. Magnetism at the center of a bar magnet is
(A) Zero
(B) Maximum
(C) Minimum
(D) Minimum or maximum
(A) Zero
(B) Maximum
(C) Minimum
(D) Minimum or maximum
Correct Answer: [A] Zero.
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
(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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