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 43 of 65
Question #841
The heat required to convert 1 g of water at 100°C to steam at 100°C is (latent heat 540 cal/g)
A. 1000 cal
B. 540 cal
C. 80 cal
D. 100 cal
Discuss
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Correct Answer: Option B

Explanation:
Latent heat of vaporisation, 540 cal/g.
This question belongs to: Science Physics
Question #842
Sound waves of frequency 20 kHz are called
A. Supersonic
B. Audible
C. Infrasonic
D. Ultrasonic
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Correct Answer: Option D

Explanation:
Above 20 kHz is ultrasonic.
This question belongs to: Science Physics
Question #843
The loudness of sound is measured in
A. Meter
B. Hertz
C. Watt
D. Decibel
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Correct Answer: Option D

Explanation:
Decibel (dB) measures intensity level.
This question belongs to: Science Physics
Question #844
The angle of incidence is equal to angle of reflection is the law of
A. Diffraction
B. Reflection
C. Refraction
D. Dispersion
Discuss
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Correct Answer: Option B

Explanation:
Law of reflection.
This question belongs to: Science Physics
Question #845
A lens has power +1 D. Its focal length in cm is
A. 100 cm
B. 1 cm
C. 10 cm
D. 0.1 cm
Discuss
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Correct Answer: Option A

Explanation:
f = 1/P = 1 m = 100 cm.
This question belongs to: Science Physics
Question #846
The defect of vision in which the lens becomes opaque is called
A. Cataract
B. Astigmatism
C. Hypermetropia
D. Myopia
Discuss
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Correct Answer: Option A

Explanation:
Cataract: clouding of lens, treated by surgery.
This question belongs to: Science Physics
Question #847
A current of 0.5 A flows through a 100 Ω resistor. Voltage across it is
A. 0.005 V
B. 200 V
C. 5 V
D. 50 V
Discuss
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Correct Answer: Option D

Explanation:
V = IR = 0.5×100 = 50 V.
This question belongs to: Science Physics
Question #848
The resistance of a conductor is inversely proportional to its
A. Area of cross-section
B. Length
C. Resistivity
D. Temperature
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Correct Answer: Option A

Explanation:
R ∝ 1/A.
This question belongs to: Science Physics
Question #849
A electric iron of 500 W is used for 2 hours. Energy consumed in kWh is
A. 1 kWh
B. 0.5 kWh
C. 250 kWh
D. 1000 kWh
Discuss
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Correct Answer: Option A

Explanation:
0.5 kW × 2 h = 1 kWh.
This question belongs to: Science Physics
Question #850
A step-down transformer has turns ratio 10:1. Input voltage 220 V, output voltage is
A. 110 V
B. 22 V
C. 440 V
D. 2200 V
Discuss
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Correct Answer: Option B

Explanation:
Vs/Vp = Ns/Np = 1/10 => Vs = 220/10 = 22 V.
This question belongs to: Science Physics
Question #851
The half-life of a substance is 2 years. After 6 years, what fraction of original substance remains?
A. 1/2
B. 1/4
C. 1/16
D. 1/8
Discuss
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Correct Answer: Option D

Explanation:
3 half-lives => 1/8.
This question belongs to: Science Physics
Question #852
The particle with highest ionising power is
A. Neutron
B. Alpha
C. Beta
D. Gamma
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Correct Answer: Option B

Explanation:
Alpha particles heavy, slow, high ionisation.
This question belongs to: Science Physics
Question #853
The energy source of the Sun is
A. Nuclear fission
B. Chemical reaction
C. Gravitational collapse
D. Nuclear fusion
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Correct Answer: Option D

Explanation:
Hydrogen fusion to helium releases energy.
This question belongs to: Science Physics
Question #854
A simple pendulum is taken to moon. Its time period
A. Becomes zero
B. Decreases
C. Remains same
D. Increases
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Correct Answer: Option D

Explanation:
T ∝ 1/√g, g_moon < g_earth, so T increases.
This question belongs to: Science Physics
Question #855
The distance between two consecutive compressions in a longitudinal wave is called
A. Time period
B. Wavelength
C. Frequency
D. Amplitude
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Correct Answer: Option B

Explanation:
Wavelength.
This question belongs to: Science Physics
Question #856
The instrument used to measure atmospheric humidity is
A. Hydrometer
B. Hygrometer
C. Barometer
D. Manometer
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Correct Answer: Option B

Explanation:
Hygrometer measures humidity.
This question belongs to: Science Physics
Question #857
A voltmeter is always connected in
A. Parallel
B. Across the ammeter
C. Either series or parallel
D. Series
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Correct Answer: Option A

Explanation:
Voltmeter measures potential difference, must be parallel.
This question belongs to: Science Physics
Question #858
The process of evaporation causes
A. Cooling
B. Boiling
C. Heating
D. No temperature change
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Correct Answer: Option A

Explanation:
Evaporation absorbs latent heat from surroundings, cooling effect.
This question belongs to: Science Physics
Question #859
Which gas is filled in an electric bulb?
A. Oxygen
B. Argon or nitrogen
C. Hydrogen
D. Carbon dioxide
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Correct Answer: Option B

Explanation:
Inert gases like argon, nitrogen prevent filament oxidation.
This question belongs to: Science Physics
Question #860
The scientist who invented the telephone was
A. Edison
B. Bell
C. Marconi
D. Tesla
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Correct Answer: Option B

Explanation:
Alexander Graham Bell patented telephone in 1876.
This question belongs to: Science Physics

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