Physics MCQs

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Physics MCQs

Practice the latest Physics MCQs with answers and detailed explanations. This section includes chapter-wise multiple-choice questions covering mechanics, motion, force, work and energy, heat, light, electricity, magnetism, modern physics, waves, optics, and other important topics. These exam-oriented MCQs are ideal for Class 9ā€“12, NEET, JEE, CUET, SSC, Banking, Railway, JKSSB, Defence, Police, and other competitive exams.

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Practice Questions

Page 64 of 65
Question #1261
The odometer in a vehicle measures
A. Fuel consumption
B. Engine RPM
C. Speed
D. Distance travelled
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Correct Answer: Option D

Explanation:
Odometer records cumulative distance. Speedometer shows instantaneous speed.
This question belongs to: Science Physics
Question #1262
The device used to convert mechanical energy into electrical energy is
A. Rectifier
B. Motor
C. Transformer
D. Generator
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Correct Answer: Option D

Explanation:
Generator works on electromagnetic induction.
This question belongs to: Science Physics
Question #1263
A device that converts light energy into electrical energy is
A. Laser
B. Solar cell
C. LED
D. Photodiode
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Correct Answer: Option B

Explanation:
Solar cell (photovoltaic cell) generates electricity from sunlight.
This question belongs to: Science Physics
Question #1264
The part of the eye that controls the amount of light entering is
A. Lens
B. Iris
C. Retina
D. Cornea
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Correct Answer: Option B

Explanation:
Iris adjusts pupil size.
This question belongs to: Science Physics
Question #1265
The gas used in refrigerators is
A. Nitrogen
B. Carbon dioxide
C. Freon
D. Oxygen
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Correct Answer: Option C

Explanation:
Freon (CFC) was used as refrigerant; now HFCs used. Freon is common answer in exams.
This question belongs to: Science Physics
Question #1266
The scientist who discovered electromagnetic induction was
A. Volta
B. Ampere
C. Oersted
D. Faraday
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Correct Answer: Option D

Explanation:
Michael Faraday.
This question belongs to: Science Physics
Question #1267
The law of inertia was given by
A. Kepler
B. Copernicus
C. Galileo
D. Newton
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Correct Answer: Option C

Explanation:
Galileo first stated the concept; Newton formalized as first law.
This question belongs to: Science Physics
Question #1268
The scientist who discovered X-rays is
A. Rutherford
B. Becquerel
C. Roentgen
D. Curie
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Correct Answer: Option C

Explanation:
Wilhelm Roentgen discovered X-rays in 1895, won first Nobel in Physics.
This question belongs to: Science Physics
Question #1269
Who is known as the father of nuclear physics?
A. Bohr
B. Rutherford
C. Einstein
D. Thomson
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Correct Answer: Option B

Explanation:
Ernest Rutherford first identified nucleus, classified alpha/beta rays, transmuted elements.
This question belongs to: Science Physics
Question #1270
C.V. Raman discovered the Raman effect in which year?
A. 1905
B. 1928
C. 1930
D. 1913
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Correct Answer: Option B

Explanation:
Raman effect discovered in 1928, Nobel in 1930.
This question belongs to: Science Physics
Question #1271
One astronomical unit (AU) is the
A. Distance between Earth and Moon
B. Radius of Earth
C. Distance travelled by light in one year
D. Distance between Earth and Sun
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Correct Answer: Option D

Explanation:
1 AU ā‰ˆ 1.5 Ɨ 10āø km, average Earth-Sun distance.
This question belongs to: Science Physics
Question #1272
The prefix 'pico' represents
A. 10ā»ā¶
B. 10ā»ā¹
C. 10ā»Ā¹Ā²
D. 10ā»Ā¹āµ
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Correct Answer: Option C

Explanation:
pico = 10ā»Ā¹Ā². Femto = 10ā»Ā¹āµ.
This question belongs to: Science Physics
Question #1273
The uncertainty principle was proposed by
A. Schrƶdinger
B. Heisenberg
C. Planck
D. Bohr
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Correct Answer: Option B

Explanation:
Heisenberg's uncertainty principle: Ī”xĀ·Ī”p ā‰„ h/4Ļ€.
This question belongs to: Science Physics
Question #1274
A radioactive substance decays to 1/16th of its original mass in 20 days. Half-life is
A. 10 days
B. 5 days
C. 2 days
D. 4 days
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Correct Answer: Option B

Explanation:
(1/2)^n = 1/16 => n=4 half-lives in 20 days => half-life = 5 days.
This question belongs to: Science Physics
Question #1275
The moderator used in a nuclear reactor serves to
A. Generate neutrons
B. Cool the reactor
C. Slow down neutrons
D. Absorb neutrons
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Correct Answer: Option C

Explanation:
Moderator slows fast neutrons to thermal energies.
This question belongs to: Science Physics
Question #1276
The process of evaporation results in
A. Boiling
B. Heating
C. No temperature change
D. Cooling
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Correct Answer: Option D

Explanation:
Evaporation absorbs latent heat from surroundings, causing cooling.
This question belongs to: Science Physics
Question #1277
A piece of ice is floating in a glass of water. When ice melts, water level
A. Remains same
B. First falls then rises
C. Falls
D. Rises
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Correct Answer: Option A

Explanation:
Ice displaces water equal to its weight; when melted, occupies exactly that volume. Level unchanged.
This question belongs to: Science Physics
Question #1278
A force of 10 N acts on a body of mass 2 kg for 1 s. Change in momentum is
A. 10 kg m/s
B. 5 kg m/s
C. 20 kg m/s
D. 2 kg m/s
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Correct Answer: Option A

Explanation:
Impulse = F t = 10 N s = change in momentum.
This question belongs to: Science Physics
Question #1279
The unit of power, watt, is equivalent to
A. N/s
B. J s
C. N m
D. J/s
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Correct Answer: Option D

Explanation:
Watt = joule per second.
This question belongs to: Science Physics
Question #1280
A ball is thrown vertically upward with velocity 49 m/s. Maximum height (g=9.8) is
A. 245 m
B. 122.5 m
C. 490 m
D. 98 m
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Correct Answer: Option B

Explanation:
H = uĀ²/(2g) = 2401/(19.6) = 122.5 m.
This question belongs to: Science Physics

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