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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Total Questions

Practice Questions

Page 24 of 65
Question #461
A lens of power +5 D has focal length
A. 0.2 m
B. 0.5 m
C. 2 m
D. 5 m
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Correct Answer: Option A

Explanation:
f = 1/P = 1/5 = 0.2 m = 20 cm. Positive power convex lens. Dioptre = 1/m. Standard formula.
This question belongs to: Science Physics
Question #462
The energy possessed by a body due to its position or configuration is called
A. Thermal energy
B. Kinetic energy
C. Potential energy
D. Nuclear energy
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Correct Answer: Option C

Explanation:
Potential energy: gravitational (mgh), elastic (Β½kxΒ²). Kinetic energy due to motion. Total mechanical energy sum conserved in conservative forces.
This question belongs to: Science Physics
Question #463
Which of the following is an ohmic conductor?
A. Copper wire
B. Diode
C. Electrolyte
D. Transistor
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Correct Answer: Option A

Explanation:
Copper wire obeys Ohm's law (V ∝ I) at constant temperature. Diode, transistor are non-ohmic (non-linear). Electrolytes can be non-linear. Metals are ohmic.
This question belongs to: Science Physics
Question #464
The rate of change of momentum is equal to
A. Work
B. Impulse
C. Power
D. Force
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Correct Answer: Option D

Explanation:
F = dp/dt (Newton's second law original form). Impulse is Ξ”p. Work FΒ·s. Power dW/dt.
This question belongs to: Science Physics
Question #465
A fuse wire is made of an alloy of tin and lead because it has
A. Low melting point and high resistance
B. Low melting point and low resistance
C. High melting point and high resistance
D. High melting point and low resistance
Discuss
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Correct Answer: Option A

Explanation:
Fuse needs low melting point to melt at overload, high resistance to generate more heat (IΒ²R). Tin-lead alloy suitable. Copper high melting point, not fuse material.
This question belongs to: Science Physics
Question #466
The image formed by a concave lens is always
A. Virtual, erect, diminished
B. Real, inverted, diminished
C. Real, erect, magnified
D. Virtual, inverted, magnified
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Correct Answer: Option A

Explanation:
Concave lens diverges light, always forms virtual, erect, diminished image on same side as object. Used in spectacles for myopia.
This question belongs to: Science Physics
Question #467
An electric heater of resistance 10 Ξ© draws current 5 A. Power consumed is
A. 50 W
B. 250 W
C. 500 W
D. 2 W
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Correct Answer: Option B

Explanation:
P = IΒ²R = 5Β² Γ— 10 = 25 Γ— 10 = 250 W. Also P = VI, but V not given. Can find V = IR = 50 V, then P = 50Γ—5 = 250 W.
This question belongs to: Science Physics
Question #468
The process by which heat from the Sun reaches Earth is
A. Convection
B. Evaporation
C. Conduction
D. Radiation
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Correct Answer: Option D

Explanation:
Space is vacuum, only radiation can travel without medium. Sun emits electromagnetic radiation (infrared, visible, UV). Earth's atmosphere absorbs some.
This question belongs to: Science Physics
Question #469
The unit of electric potential is
A. Coulomb
B. Ohm
C. Volt
D. Ampere
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Correct Answer: Option C

Explanation:
Volt = J/C. Named after Alessandro Volta. Potential difference drives current. 1 V = 1 J of work per coulomb charge moved.
This question belongs to: Science Physics
Question #470
The frequency of AC mains in India is
A. 50 Hz
B. 100 Hz
C. 0 Hz
D. 60 Hz
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Correct Answer: Option A

Explanation:
Indian grid frequency 50 Hz, voltage 230 V. In USA 60 Hz. Most Asian/European countries 50 Hz. Transformers designed accordingly.
This question belongs to: Science Physics
Question #471
The part of human eye that controls amount of light entering is
A. Retina
B. Cornea
C. Lens
D. Iris
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Correct Answer: Option D

Explanation:
Iris adjusts pupil size. In bright light pupil constricts, dim light dilates. Retina forms image. Cornea and lens focus. Eye is like camera.
This question belongs to: Science Physics
Question #472
A stone tied to a string is whirled in a circle. The work done by tension in string is
A. Positive
B. Negative
C. Variable
D. Zero
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Correct Answer: Option D

Explanation:
Tension is towards centre, displacement is tangential (velocity). Force perpendicular to displacement, cos90Β°=0, work zero. Centripetal force does no work, doesn't change speed.
This question belongs to: Science Physics
Question #473
The material used for making solar cells is
A. Iron
B. Aluminium
C. Silicon
D. Copper
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Correct Answer: Option C

Explanation:
Silicon semiconductor, abundant, efficient for photovoltaic cells. Also gallium arsenide. Solar cells convert light to electricity. Renewable energy technology.
This question belongs to: Science Physics
Question #474
A 5 kg object is moving with 2 m/s. Its momentum is
A. 10 kg m/s
B. 2.5 kg m/s
C. 0.4 kg m/s
D. 7 kg m/s
Discuss
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Correct Answer: Option A

Explanation:
p = m v = 5 Γ— 2 = 10 kg m/s. Direction same as velocity. Momentum vector. Unit kgΒ·m/s.
This question belongs to: Science Physics
Question #475
The device that protects electrical circuits from overload is
A. Switch
B. Fuse
C. Resistor
D. Capacitor
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Correct Answer: Option B

Explanation:
Fuse melts and breaks circuit when current exceeds rating. MCB (Miniature Circuit Breaker) does same but resettable. Switch only turns on/off. Resistor limits current but doesn't break.
This question belongs to: Science Physics
Question #476
The frequency of a wave is 1000 Hz. Its time period is
A. 1 s
B. 1000 s
C. 0.001 s
D. 0.01 s
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Correct Answer: Option C

Explanation:
T = 1/f = 1/1000 = 0.001 s = 1 ms. Millisecond. For higher frequency, period shorter.
This question belongs to: Science Physics
Question #477
A metal spoon placed in a hot cup of tea gets hot due to
A. Conduction
B. Convection
C. Radiation
D. Evaporation
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Correct Answer: Option A

Explanation:
Heat travels through spoon from hot end to cold end by conduction (molecular vibration and free electrons). Handle gets hot. Metal good conductor.
This question belongs to: Science Physics
Question #478
The main component of natural gas used for cooking is
A. Butane
B. Propane
C. Methane
D. Ethane
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Correct Answer: Option C

Explanation:
Methane (CHβ‚„) is primary component. LPG is mainly propane and butane. CNG is compressed methane. This relates to everyday physics and chemistry.
This question belongs to: Science Physics
Question #479
The device used to convert solar energy into electrical energy is
A. Solar cell
B. Wind turbine
C. Battery
D. Solar heater
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Correct Answer: Option A

Explanation:
Photovoltaic cell (solar cell) directly converts sunlight to electricity. Solar heater uses sun to heat water, not electricity. Wind turbine converts wind energy. Battery stores chemical energy.
This question belongs to: Science Physics
Question #480
When a body is taken to a height equal to radius of Earth from surface, its weight becomes
A. Half
B. Same
C. Double
D. One-fourth
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Correct Answer: Option D

Explanation:
g' = g (R/(R+h))Β². If h=R, g' = g (R/2R)Β² = g/4. Weight = mg' = mg/4, one-fourth. Above surface, g decreases with square of distance from centre.
This question belongs to: Science Physics

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