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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Question #1201
The percentage error in the measurement of mass is 1% and speed is 2%. Error in kinetic energy is
A. 2%
B. 4%
C. 6%
D. 5%
Discuss
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Correct Answer: Option D

Explanation:
KE = ½mv², ΔKE/KE = Δm/m + 2 Δv/v = 1% + 4% = 5%.
This question belongs to: Science Physics
Question #1202
A body is thrown vertically upward with speed 40 m/s. Distance travelled in last second of ascent (g=10)
A. 20 m
B. 35 m
C. 15 m
D. 5 m
Discuss
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Correct Answer: Option D

Explanation:
Time of ascent = u/g = 4 s. Distance in last second (4th) = ½g(1)²? Actually, during last second of upward journey, velocity becomes zero. Distance = ½g(1)² = 5 m. Formula: s = u - g/2 (2n-1) with n=4? Let's compute: s_nth = u - (g/2)(2n-1). For n=4 (4th second), s = 40 - 5×7 = 40 - 35 = 5 m. Yes.
This question belongs to: Science Physics
Question #1203
A ball is dropped from a height of 5 m on a floor and rebounds to 1.25 m. Coefficient of restitution is
A. 0.25
B. 0.5
C. 1
D. 0.8
Discuss
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Correct Answer: Option B

Explanation:
e = √(h₂/h₁) = √(1.25/5) = √0.25 = 0.5.
This question belongs to: Science Physics
Question #1204
A bullet of mass 10 g moving at 300 m/s penetrates 10 cm into a wooden block. Average resistive force is
A. 9000 N
B. 3000 N
C. 4500 N
D. 1500 N
Discuss
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Correct Answer: Option C

Explanation:
KE lost = ½ m v² = ½×0.01×90000 = 450 J. Work = F×s => 450 = F×0.1 => F = 4500 N.
This question belongs to: Science Physics
Question #1205
A motor pump lifts 200 kg of water per minute to a height of 15 m. Power (g=10) is
A. 2000 W
B. 500 W
C. 1000 W
D. 3000 W
Discuss
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Correct Answer: Option B

Explanation:
Work per minute = mgh = 200×10×15 = 30000 J. Power = 30000/60 = 500 W.
This question belongs to: Science Physics
Question #1206
The kinetic energy of a body is 100 J and momentum 50 kg m/s. Mass is
A. 4 kg
B. 2 kg
C. 12.5 kg
D. 25 kg
Discuss
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Correct Answer: Option C

Explanation:
K = p²/(2m) => 100 = 2500/(2m) => m = 2500/200 = 12.5 kg.
This question belongs to: Science Physics
Question #1207
The centre of mass of a uniform semicircular ring of radius R lies at distance from centre
A. R/2
B. 2R/π
C. R/3
D. R/π
Discuss
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Correct Answer: Option B

Explanation:
For semicircular ring, y_cm = 2R/π from centre.
This question belongs to: Science Physics
Question #1208
A solid sphere and a hollow sphere of same mass and radius are rolled down an incline. Which reaches bottom first?
A. Hollow sphere
B. Both together
C. Depends on material
D. Solid sphere
Discuss
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Correct Answer: Option D

Explanation:
Solid sphere has smaller moment of inertia (2/5 MR²) than hollow (2/3 MR²). Less energy in rotation, more in translation, faster.
This question belongs to: Science Physics
Question #1209
The moment of inertia of a thin rod of mass M and length L about an axis through its centre and perpendicular to length is
A. ML²
B. ML²/3
C. ML²/2
D. ML²/12
Discuss
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Correct Answer: Option D

Explanation:
I_center = ML²/12. About end = ML²/3.
This question belongs to: Science Physics
Question #1210
A flywheel rotates at 120 rpm. Angular velocity in rad/s is
A. 4π
B. 2π
C. 6π
D. π
Discuss
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Correct Answer: Option A

Explanation:
ω = 2π × (rpm/60) = 2π × 120/60 = 4π rad/s.
This question belongs to: Science Physics
Question #1211
The term 'latent heat' was introduced by
A. Kelvin
B. Black
C. Calorie
D. Joule
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Correct Answer: Option B

Explanation:
Joseph Black introduced concept of latent heat and specific heat.
This question belongs to: Science Physics
Question #1212
0°C on Fahrenheit scale is
A. 32°F
B. 212°F
C. 0°F
D. 180°F
Discuss
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Correct Answer: Option A

Explanation:
Freezing point 0°C = 32°F.
This question belongs to: Science Physics
Question #1213
A piece of copper wire has resistance 10 Ω at 0°C. α = 0.004/°C. At 100°C resistance is
A. 8 Ω
B. 14 Ω
C. 12 Ω
D. 10 Ω
Discuss
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Correct Answer: Option B

Explanation:
R_t = R₀(1+α t) = 10(1+0.004×100) = 10(1.4) = 14 Ω.
This question belongs to: Science Physics
Question #1214
In a semiconductor, the temperature coefficient of resistance is
A. Positive
B. Zero
C. Negative
D. Infinite
Discuss
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Correct Answer: Option C

Explanation:
Semiconductors have negative temperature coefficient: resistance decreases with temperature.
This question belongs to: Science Physics
Question #1215
The unit of mutual inductance is
A. Tesla
B. Weber
C. Henry
D. Farad
Discuss
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Correct Answer: Option C

Explanation:
Mutual inductance M = emf/(di/dt), unit Henry.
This question belongs to: Science Physics
Question #1216
A 10 μF capacitor is charged to 100 V. Energy stored is
A. 0.05 J
B. 50 J
C. 5 J
D. 0.5 J
Discuss
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Correct Answer: Option A

Explanation:
E = ½CV² = ½ × 10×10⁻⁶ × 10000 = 0.05 J.
This question belongs to: Science Physics
Question #1217
The relative permeability of a ferromagnetic material is
A. Slightly less than 1
B. Very large
C. Exactly 1
D. Slightly greater than 1
Discuss
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Correct Answer: Option B

Explanation:
Ferromagnetic materials have μ_r >> 1 (hundreds to thousands). Paramagnetic slightly >1, diamagnetic
This question belongs to: Science Physics
Question #1218
The Curie temperature is the temperature above which
A. A magnet loses its magnetism
B. Semiconductor becomes conductor
C. Resistance becomes zero
D. A material becomes superconducting
Discuss
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Correct Answer: Option A

Explanation:
Curie point: ferromagnetic to paramagnetic transition.
This question belongs to: Science Physics
Question #1219
The electromagnetic waves with highest frequency are
A. Gamma rays
B. Radio waves
C. Ultraviolet
D. X-rays
Discuss
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Correct Answer: Option A

Explanation:
Gamma rays >10¹⁹ Hz, highest.
This question belongs to: Science Physics
Question #1220
A wire of length L and resistance R is stretched so that its length becomes 3L. New resistance is
A. R/3
B. 9R
C. 3R
D. R/9
Discuss
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Correct Answer: Option B

Explanation:
Volume constant, R ∝ L², so (3)²=9 times.
This question belongs to: Science Physics

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