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 41 of 65
Question #801
A piece of ice of density 0.9 g/cm³ floats in water. Fraction of volume above water is
A. 0.1
B. 0.9
C. 0.2
D. 0.5
Discuss
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Correct Answer: Option A

Explanation:
Submerged fraction = ρ_ice/ρ_water = 0.9, above = 0.1 (10%).
This question belongs to: Science Physics
Question #802
Heat is a form of
A. Temperature
B. Energy
C. Pressure
D. Power
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Correct Answer: Option B

Explanation:
Heat is energy transferred due to temperature difference.
This question belongs to: Science Physics
Question #803
The boiling point of water on absolute scale (Kelvin) is
A. 273 K
B. 212 K
C. 100 K
D. 373 K
Discuss
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Correct Answer: Option D

Explanation:
100°C = 373.15 K ≈ 373 K.
This question belongs to: Science Physics
Question #804
The amount of heat required to raise temperature of 1 g water by 1°C is
A. Both B and C
B. 4.2 J
C. 1 cal
D. 1 J
Discuss
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Correct Answer: Option A

Explanation:
1 cal = 4.186 J ≈ 4.2 J. So both are correct. However option D covers both. I'll set D as correct.
This question belongs to: Science Physics
Question #805
The speed of sound is maximum in
A. Air at 20°C
B. Water
C. Iron
D. Air at 0°C
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Correct Answer: Option C

Explanation:
Sound travels fastest in solids. Iron ~5000 m/s.
This question belongs to: Science Physics
Question #806
A SONAR signal sent from a ship returns after 2 s. If speed of sound in water is 1500 m/s, depth of sea is
A. 750 m
B. 1500 m
C. 3000 m
D. 375 m
Discuss
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Correct Answer: Option B

Explanation:
d = v t/2 = 1500×2/2 = 1500 m.
This question belongs to: Science Physics
Question #807
A vibrating tuning fork produces sound waves. These waves are
A. Longitudinal
B. Transverse
C. Electromagnetic
D. Stationary
Discuss
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Correct Answer: Option A

Explanation:
Sound in air is longitudinal.
This question belongs to: Science Physics
Question #808
A convex lens of focal length 20 cm is used as a magnifying glass. For maximum magnification, object should be placed at
A. Infinity
B. Just inside the focal point
C. 20 cm
D. At 2F
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Correct Answer: Option B

Explanation:
As simple microscope, object near F (just inside) gives virtual, magnified image.
This question belongs to: Science Physics
Question #809
The focal length of a concave mirror is 10 cm. Object placed at 20 cm gives image distance
A. 5 cm
B. Infinity
C. 10 cm
D. 20 cm
Discuss
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Correct Answer: Option D

Explanation:
u = -20, f = -10. Mirror formula: 1/f = 1/v + 1/u => 1/(-10) = 1/v + 1/(-20) => -1/10 = 1/v - 1/20 => 1/v = -1/10 + 1/20 = -1/20 => v = -20 cm, image at C.
This question belongs to: Science Physics
Question #810
The colour of an object is due to
A. Emission of that colour
B. Transmission of that colour
C. Reflection of that colour
D. Absorption of all colours
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Correct Answer: Option C

Explanation:
Object reflects that colour and absorbs others.
This question belongs to: Science Physics
Question #811
The voltage of domestic AC supply in India is
A. 230 V, 50 Hz
B. 110 V, 60 Hz
C. 240 V, 60 Hz
D. 220 V, 50 Hz
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Correct Answer: Option A

Explanation:
Standard in India: 230 V, 50 Hz (often 220-240).
This question belongs to: Science Physics
Question #812
A fuse wire is connected in which wire of the circuit?
A. Any wire
B. Phase (live)
C. Earth
D. Neutral
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Correct Answer: Option B

Explanation:
Fuse must be in live wire so that appliance is isolated when fuse blows.
This question belongs to: Science Physics
Question #813
An electron enters a magnetic field parallel to the field lines. Force is
A. Maximum
B. Half of maximum
C. Depends on speed
D. Zero
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Correct Answer: Option D

Explanation:
F = qvB sinθ, θ=0 => sin0=0, zero force.
This question belongs to: Science Physics
Question #814
The essential difference between AC and DC is
A. Direction of current
B. Voltage level
C. Magnitude only
D. Resistance
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Correct Answer: Option A

Explanation:
AC changes direction periodically, DC unidirectional.
This question belongs to: Science Physics
Question #815
In a step-up transformer, the primary coil has
A. Fewer turns and thinner wire
B. More turns and thinner wire
C. Fewer turns and thicker wire
D. More turns and thicker wire
Discuss
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Correct Answer: Option C

Explanation:
Step-up: Ns > Np. Primary fewer turns, thicker wire because current higher on primary side (for step-up, Vp < Vs, Ip > Is).
This question belongs to: Science Physics
Question #816
Radioactivity is a phenomenon associated with
A. Chemical reactions
B. Electron transitions
C. Molecular vibrations
D. Nuclear instability
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Correct Answer: Option D

Explanation:
Unstable nuclei emit radiation to become stable.
This question belongs to: Science Physics
Question #817
The isotope of hydrogen with 2 neutrons is
A. Deuterium
B. Tritium
C. Protium
D. Helium-3
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Correct Answer: Option B

Explanation:
Protium 0 neutrons, Deuterium 1, Tritium 2.
This question belongs to: Science Physics
Question #818
The process of splitting a heavy nucleus into lighter nuclei is
A. Fusion
B. Radioactive decay
C. Fission
D. Transmutation
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Correct Answer: Option C

Explanation:
Fission, e.g., U-235 splitting.
This question belongs to: Science Physics
Question #819
The time period of a seconds pendulum is
A. 4 s
B. 2 s
C. 1 s
D. 0.5 s
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Correct Answer: Option B

Explanation:
Seconds pendulum has period 2 s (1 s each swing).
This question belongs to: Science Physics
Question #820
The waves used in radar are
A. Radio waves
B. Sound waves
C. Microwaves
D. Ultrasound
Discuss
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Correct Answer: Option C

Explanation:
RADAR (Radio Detection and Ranging) uses microwaves, a type of radio wave but usually specific microwave band. Often answer is microwaves. But radio waves also correct. I'll specify microwave as typical answer. Could be radio. Better: microwave. Many exams say microwaves. I'll stick with B.
This question belongs to: Science Physics

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