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 9–12, NEET, JEE, CUET, SSC, Banking, Railway, JKSSB, Defence, Police, and other competitive exams.

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Practice Questions

Page 47 of 65
Question #921
Which of the following is not a source of renewable energy?
A. Natural gas
B. Wind
C. Tides
D. Sun
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Correct Answer: Option A

Explanation:
Natural gas is fossil fuel, non-renewable.
This question belongs to: Science Physics
Question #922
The SI unit of charge is
A. Coulomb
B. Volt
C. Ohm
D. Ampere
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Correct Answer: Option A

Explanation:
Coulomb (C).
This question belongs to: Science Physics
Question #923
The process of adding impurity to a semiconductor is called
A. Sintering
B. Doping
C. Purification
D. Annealing
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Correct Answer: Option B

Explanation:
Doping increases conductivity.
This question belongs to: Science Physics
Question #924
A conductor has resistance 4 Ω at 0°C and temperature coefficient α. At what temperature will resistance be 6 Ω? (α=0.004 /°C)
A. 150°C
B. 125°C
C. 100°C
D. 75°C
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Correct Answer: Option B

Explanation:
R_t = R₀(1+α t). 6 = 4(1+0.004 t) => 1.5 = 1+0.004t => 0.5=0.004t => t=125°C.
This question belongs to: Science Physics
Question #925
The force between two charges in vacuum is F. If a medium of dielectric constant 4 is introduced, force becomes
A. F/4
B. 4F
C. 2F
D. F/2
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Correct Answer: Option A

Explanation:
F_medium = F_vacuum / K.
This question belongs to: Science Physics
Question #926
A magnetic field cannot
A. Exert force on a charge
B. Accelerate a charge
C. Change kinetic energy of a charge
D. Change momentum of a charge
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Correct Answer: Option C

Explanation:
Magnetic force perpendicular to velocity, work zero, KE constant.
This question belongs to: Science Physics
Question #927
The device used to increase or decrease AC voltage is
A. Rectifier
B. Motor
C. Transformer
D. Generator
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Correct Answer: Option C

Explanation:
Transformer changes AC voltage.
This question belongs to: Science Physics
Question #928
The mass number of an element is sum of
A. Protons and electrons
B. Protons and neutrons
C. Protons only
D. Neutrons and electrons
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Correct Answer: Option B

Explanation:
Mass number A = Z + N.
This question belongs to: Science Physics
Question #929
The time period of a simple pendulum on Earth is T. If taken to a planet where g is 4 times, new period is
A. T/4
B. 2T
C. T/2
D. T
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Correct Answer: Option C

Explanation:
T ∝ 1/√g, g'=4g => T' = T/√4 = T/2.
This question belongs to: Science Physics
Question #930
A tuning fork of frequency 256 Hz is sounded. In 1 second, number of compressions produced is
A. 128
B. 1
C. 512
D. 256
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Correct Answer: Option D

Explanation:
Each cycle produces one compression. 256 cycles, 256 compressions.
This question belongs to: Science Physics
Question #931
The unit of luminous flux is
A. Lux
B. Candela
C. Watt
D. Lumen
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Correct Answer: Option D

Explanation:
Lumen (lm).
This question belongs to: Science Physics
Question #932
An object of mass 10 kg is moving with velocity 5 m/s. Its kinetic energy is
A. 125 J
B. 25 J
C. 250 J
D. 500 J
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Correct Answer: Option A

Explanation:
K = ½ × 10 × 25 = 125 J.
This question belongs to: Science Physics
Question #933
The boiling point of water decreases at high altitudes because
A. Wind speed high
B. Temperature is low
C. Humidity is low
D. Pressure is low
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Correct Answer: Option D

Explanation:
Low atmospheric pressure reduces boiling point.
This question belongs to: Science Physics
Question #934
The force that binds nucleons in a nucleus is
A. Gravitational
B. Weak nuclear force
C. Electrostatic
D. Strong nuclear force
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Correct Answer: Option D

Explanation:
Strong nuclear force, short range, attractive.
This question belongs to: Science Physics
Question #935
The instrument used to measure electric current is
A. Ammeter
B. Galvanometer
C. Voltmeter
D. Ohmmeter
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Correct Answer: Option A

Explanation:
Ammeter measures current in series.
This question belongs to: Science Physics
Question #936
The unit of resistivity is
A. Ohm per metre
B. Henry
C. Siemens
D. Ohm metre
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Correct Answer: Option D

Explanation:
ρ = R A / L, unit Ω m.
This question belongs to: Science Physics
Question #937
Which of the following is a semiconductor?
A. Copper
B. Silver
C. Iron
D. Silicon
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Correct Answer: Option D

Explanation:
Silicon and germanium are semiconductors.
This question belongs to: Science Physics
Question #938
The greenhouse effect is mainly due to increase in
A. Carbon dioxide
B. Argon
C. Oxygen
D. Nitrogen
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Correct Answer: Option A

Explanation:
CO2, methane trap heat.
This question belongs to: Science Physics
Question #939
The sound produced by a bat is
A. Infrasonic
B. Ultrasonic
C. Audible
D. Subsonic
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Correct Answer: Option B

Explanation:
Bats use ultrasound for echolocation.
This question belongs to: Science Physics
Question #940
The scientist who gave the law of inertia was
A. Copernicus
B. Newton
C. Galileo
D. Kepler
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Correct Answer: Option C

Explanation:
Galileo first proposed concept of inertia. Newton formalized.
This question belongs to: Science Physics

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