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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Page 38 of 65
Question #741
Which appliance works on the principle of electromagnetic induction?
A. Fuse
B. Electric heater
C. Induction cooker
D. Incandescent bulb
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Correct Answer: Option C

Explanation:
Induction cooker induces eddy currents in pan. Heater uses Joule heating.
This question belongs to: Science Physics
Question #742
LED works on the principle of
A. Photoelectric effect
B. Electroluminescence
C. Thermionic emission
D. Field emission
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Correct Answer: Option B

Explanation:
Recombination of electrons and holes emits light in forward-biased p-n junction.
This question belongs to: Science Physics
Question #743
Which scientist discovered the laws of planetary motion?
A. Newton
B. Copernicus
C. Galileo
D. Kepler
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Correct Answer: Option D

Explanation:
Kepler's laws of planetary motion. Newton explained them via gravitation.
This question belongs to: Science Physics
Question #744
C.V. Raman discovered
A. Compton effect
B. Photoelectric effect
C. Zeeman effect
D. Raman effect
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Correct Answer: Option D

Explanation:
Raman effect: inelastic scattering of light, 1928, Nobel 1930.
This question belongs to: Science Physics
Question #745
A 50 kg person climbs 30 steps each 15 cm high in 10 s. Power (g=10) is
A. 225 W
B. 300 W
C. 150 W
D. 2250 W
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Correct Answer: Option A

Explanation:
Height = 30×0.15=4.5 m. Work = 50×10×4.5=2250 J. Power=2250/10=225 W.
This question belongs to: Science Physics
Question #746
Momentum is conserved in
A. Only inelastic collisions
B. All collisions
C. Only elastic collisions
D. No collisions
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Correct Answer: Option B

Explanation:
Momentum conserved in all collisions if no external force. KE conserved only in elastic.
This question belongs to: Science Physics
Question #747
A car of mass 1000 kg moves with velocity 20 m/s. Kinetic energy is
A. 20 kJ
B. 10 kJ
C. 400 kJ
D. 200 kJ
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Correct Answer: Option D

Explanation:
KE = ½×1000×400 = 200,000 J = 200 kJ.
This question belongs to: Science Physics
Question #748
Work done against gravity in lifting a 5 kg mass through 2 m (g=10) is
A. 10 J
B. 25 J
C. 50 J
D. 100 J
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Correct Answer: Option D

Explanation:
W = mgh = 5×10×2 = 100 J.
This question belongs to: Science Physics
Question #749
A body is dropped from a height of 20 m. Its velocity on reaching ground (g=10) is
A. 20 m/s
B. 40 m/s
C. 14.14 m/s
D. 10 m/s
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Correct Answer: Option A

Explanation:
v² = 2gh = 2×10×20=400, v=20 m/s.
This question belongs to: Science Physics
Question #750
The rate of change of displacement is
A. Speed
B. Momentum
C. Acceleration
D. Velocity
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Correct Answer: Option D

Explanation:
Velocity = d(displacement)/dt. Speed is rate of change of distance.
This question belongs to: Science Physics
Question #751
A force F gives an acceleration a to mass m. If mass doubled and force halved, acceleration becomes
A. a/4
B. a/2
C. 2a
D. a
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Correct Answer: Option A

Explanation:
a' = (F/2)/(2m) = F/(4m) = a/4.
This question belongs to: Science Physics
Question #752
The unit of impulse is
A. N/m
B. N s
C. J s
D. N m
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Correct Answer: Option B

Explanation:
Impulse = F×Δt, unit N s, same as momentum kg m/s.
This question belongs to: Science Physics
Question #753
A ball of mass 0.5 kg moving at 4 m/s strikes a wall and rebounds at same speed. Impulse imparted is
A. 8 N s
B. 4 N s
C. 2 N s
D. 0 N s
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Correct Answer: Option B

Explanation:
Δp = m(v - (-u)) = 0.5(4 - (-4)) = 0.5×8 = 4 N s.
This question belongs to: Science Physics
Question #754
The centre of mass of a two-particle system lies on the line joining them, closer to
A. Heavier particle
B. Midpoint always
C. Lighter particle
D. Depends on velocity
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Correct Answer: Option A

Explanation:
r_cm = (m1 r1 + m2 r2)/(m1+m2). Closer to heavier mass.
This question belongs to: Science Physics
Question #755
Which of the following is NOT a unit of pressure?
A. Bar
B. Torr
C. Watt
D. Pascal
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Correct Answer: Option C

Explanation:
Watt is power. Others are pressure units.
This question belongs to: Science Physics
Question #756
Water boils at a lower temperature at high altitudes because
A. Low density of air
B. Low temperature
C. High humidity
D. Low atmospheric pressure
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Correct Answer: Option D

Explanation:
Lower pressure reduces boiling point. Pressure cooker increases boiling point by raising pressure.
This question belongs to: Science Physics
Question #757
The process of heat transfer without any medium is
A. Radiation
B. Conduction
C. Convection
D. Evaporation
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Correct Answer: Option A

Explanation:
Radiation by electromagnetic waves can travel through vacuum.
This question belongs to: Science Physics
Question #758
A bimetallic strip is used in
A. Thermostat
B. Thermometer
C. Hydrometer
D. Barometer
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Correct Answer: Option A

Explanation:
Thermostat uses differential expansion to make/break circuit.
This question belongs to: Science Physics
Question #759
The freezing point of mercury is -39°C. It cannot be used in thermometers for temperatures below this because
A. It expands
B. It becomes transparent
C. It freezes
D. It evaporates
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Correct Answer: Option C

Explanation:
Below freezing point, mercury solidifies and doesn't work. Alcohol thermometers used for low temps.
This question belongs to: Science Physics
Question #760
Sound waves cannot travel through
A. Steel
B. Water
C. Air
D. Vacuum
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Correct Answer: Option D

Explanation:
Sound requires material medium. Vacuum has no particles.
This question belongs to: Science Physics

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