Thursday, February 27, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

hs Physics mcq questions For UPSC | SSC | Rail | RRB | State PSC P32


Physics - 32

156. Which of the following is not a conservative force?
(A) Electrostatic force.
(B) Magnetostatic force.
(C) Gravitational force.
(D) Frictional force

Correct Answer: [D] Frictional force.
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157. The reverberation of sound in a half is due to continued
(A) diffraction
(B) absorption
(C) reflection
(D) interference

Correct Answer: [D] interference.
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158. Glass is best described as
(A) A eutectic mixture
(B) A supercooled solution
(C) A gel
(D) An alloy

Correct Answer: [B] A supercooled solution.
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159. Glass is best described as
(A) A eutectic mixture
(B) A supercooled solution
(C) A gel
(D) An alloy

Correct Answer: [B] A supercooled solution.
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160. Glass is best described as
(A) A eutectic mixture
(B) A supercooled solution
(C) A gel
(D) An alloy

Correct Answer: [B] A supercooled solution.
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WBCS Polity and Constitution MCQs Prelims and Mains

general Physics test questions and answers For UPSC | SSC | Rail | RRB | State PSC P31


Physics - 31

151. The Earth's magnetic field
(A) is centered exactly at the Earth's center.
(B) originates in a permanently magnetized iron core.
(C) never change
(D) has reversed itself many times

Correct Answer: [D] has reversed itself many times.
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152. Graphite is used in a nuclear reactor
(A) For lining inside the reactor as an insulator.
(B) For reducing the velocity of the neutron.
(C) As a lubricant.
(D) As a fuel

Correct Answer: [B] For reducing the velocity of the neutron..
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153. Which of the following is a good nuclear fuel?
(A) Neptunium 239
(B) Thorium 236
(C) Uranium 238
(D) Plutonium 239

Correct Answer: [D] Plutonium 239.
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154. A radioactive isotope has a half-life period of 3 days. After how many days I gm of it will change to 0.125 gm?
(A) 6 days
(B) 12 day
(C) 24 days
(D) 9 days

Correct Answer: [D] 9 days.
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155. Which of the following waves is used for telecommunication?
(A) Microwaves
(B) X-rays
(C) Infrared rays
(D) Ultraviolet rays

Correct Answer: [A] Microwaves.
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WBCS Polity and Constitution MCQs Prelims and Mains

Physics questions quizlet For UPSC | SSC | Rail | RRB | State PSC P30


Physics - 30

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

Correct Answer: [D] Interference.
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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.
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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.
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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.
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150. Astronomy means the study of the
(A) Sky
(B) Sun
(C) Moon
(D) Stars

Correct Answer: [D] Stars.
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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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WBCS Polity and Constitution MCQs Prelims and Mains

Physics questions and answers For UPSC | SSC | Rail | RRB | State PSC P28


Physics - 28

136. The closest distance at which a normal person can see an object clearly is
(A) 80 cm.
(B) 25 cm.
(C) 10 cm.
(D) 50 cm

Correct Answer: [B] 25 cm..
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137. Solar energy is produced by the process of
(A) Explosion
(B) Contraction
(C) Fusion
(D) Fission

Correct Answer: [C] Fusion.
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138. The screen of the cinema hall is always white and rough. Because light rays of all colors falling on the screen suffer
(A) refraction
(B) scattering
(C) total absorption
(D) total reflection

Correct Answer: [B] scattering.
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139. With an increase in temperature the resistance of a pure semiconductor
(A) increases
(B) decreases
(C) first increases and then decreases
(D) remains the same

Correct Answer: [B] decreases.
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140. The motion of which particle through a metallic wire is called electric current?
(A) Neutron
(B) Photon
(C) Electron
(D) Positron

Correct Answer: [C] Electron.
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