Wednesday, April 24, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

PSC Online Preparations of General Science (Physics) P15



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.

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.

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

144. Magnetism at the center of a bar magnet is
(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.

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




146. Production of beats is a result of the phenomenon of
(A) Reflection
(B) Superposition
(C) Resonance
(D) Interference.

Correct Answer: [D] Interference.

147. The viewfinder of a motor car is a
(A) Convex mirror
(B) Convex lens
(C) Plane mirror
(D) Concave mirror.

Correct Answer: [A] Convex mirror.

148. Which of the rays is most dangerous?
(A) Gamma-ray
(B) X-ray
(C) Alpha ray
(D) Beta ray.

Correct Answer: [A] Gamma-ray.

149. The reaction that occurs in nuclear reactors is
(A) Nuclear fission
(B) Nuclear isomerization
(C) Nuclear fusion
(D) Spallation.

Correct Answer: [A] Nuclear fission.

150. Astronomy means the study of the
(A) Sky
(B) Sun
(C) Moon
(D) Stars.

Correct Answer: [D] Stars.



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