Physics MCQs

Question #881

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A 60 W bulb operates at 120 V. Its resistance is

A. 480 Ω

B. 240 Ω

C. 120 Ω

D. 60 Ω

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Correct Answer: Option B

Explanation:
R = V²/P = 14400/60 = 240 Ω.

This question belongs to: Science Physics

Question #882

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The unit of magnetic flux is

A. Weber

B. Farad

C. Henry

D. Tesla

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Correct Answer: Option A

Explanation:
Weber (Wb) = T m².

This question belongs to: Science Physics

Question #883

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The principle of AC generator is

A. Self induction

B. Thermoelectric effect

C. Electromagnetic induction

D. Mutual induction

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Correct Answer: Option C

Explanation:
Changing flux induces emf.

This question belongs to: Science Physics

Question #884

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The wave property that determines pitch is

A. Amplitude

B. Frequency

C. Wavelength

D. Speed

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Correct Answer: Option B

Explanation:
Pitch related to frequency.

This question belongs to: Science Physics

Question #885

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An echo is an example of

A. Diffraction of sound

B. Interference of sound

C. Reflection of sound

D. Refraction of sound

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Correct Answer: Option C

Explanation:
Echo is reflected sound.

This question belongs to: Science Physics

Question #886

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The near point of a normal human eye is

A. 50 cm

B. Infinity

C. 25 cm

D. 100 cm

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Correct Answer: Option C

Explanation:
25 cm for young adult with normal vision.

This question belongs to: Science Physics

Question #887

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The energy dissipated as heat in a resistor is given by

A. V²t/R

B. VIt

C. I²Rt

D. All of the above

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Correct Answer: Option D

Explanation:
All expressions equivalent (Joule's law).

This question belongs to: Science Physics

Question #888

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Nichrome wire is used in electric heaters because it has

A. Low density

B. High resistivity and high melting point

C. Low melting point

D. Low resistivity

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Correct Answer: Option B

Explanation:
High resistivity for heat, high melting point to withstand temperature.

This question belongs to: Science Physics

Question #889

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The weight of a body is zero when it is

A. At centre of Earth

B. At poles

C. In orbit

D. On moon

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Correct Answer: Option A

Explanation:
g=0 at centre, so weight zero.

This question belongs to: Science Physics

Question #890

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The frequency of alternating current in households in India is

A. 50 Hz

B. 60 Hz

C. 100 Hz

D. 0 Hz

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Correct Answer: Option A

Explanation:
50 Hz, 230 V.

This question belongs to: Science Physics

Question #891

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The scientist who proposed the electromagnetic theory of light was

A. Newton

B. Maxwell

C. Huygens

D. Einstein

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Correct Answer: Option B

Explanation:
Maxwell's equations predicted EM waves, light is EM.

This question belongs to: Science Physics

Question #892

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The device that converts light energy into electrical energy is

A. Photodiode

B. LED

C. Laser

D. Solar cell

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Correct Answer: Option D

Explanation:
Solar cell (photovoltaic cell) generates electricity from light.

This question belongs to: Science Physics

Question #893

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The range of audible frequency is

A. 1 Hz - 100 Hz

B. 0 - 20 Hz

C. 20 Hz - 20000 Hz

D. 20 kHz - 200 kHz

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Correct Answer: Option C

Explanation:
20 Hz to 20 kHz.

This question belongs to: Science Physics

Question #894

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A car moving at 36 km/h is brought to rest in 2 s. Deceleration is

A. 18 m/s²

B. 5 m/s²

C. 10 m/s²

D. 2.5 m/s²

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Correct Answer: Option B

Explanation:
36 km/h = 10 m/s. a = (0-10)/2 = -5 m/s², magnitude 5 m/s².

This question belongs to: Science Physics

Question #895

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A force of 12 N gives an object acceleration 4 m/s². Mass of object is

A. 8 kg

B. 3 kg

C. 0.33 kg

D. 48 kg

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Correct Answer: Option B

Explanation:
m = F/a = 12/4 = 3 kg.

This question belongs to: Science Physics

Question #896

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The gravitational force between two bodies does not depend on

A. Their masses

B. Distance between them

C. Presence of other bodies

D. Universal constant G

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Correct Answer: Option C

Explanation:
Gravitational force independent of intervening medium and other bodies (principle of superposition).

This question belongs to: Science Physics

Question #897

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The SI unit of momentum is

A. N s

B. kg m/s

C. N/m

D. J s

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Correct Answer: Option B

Explanation:
kg m/s, same as impulse unit N s.

This question belongs to: Science Physics

Question #898

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A 2 kg object has potential energy 196 J at a height (g=9.8) of

A. 98 m

B. 20 m

C. 10 m

D. 196 m

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Correct Answer: Option C

Explanation:
h = PE/(mg) = 196/(2×9.8) = 196/19.6 = 10 m.

This question belongs to: Science Physics

Question #899

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The direction of magnetic field around a straight current-carrying wire is given by

A. Right hand thumb rule

B. Ohm's law

C. Fleming's right hand rule

D. Fleming's left hand rule

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Correct Answer: Option A

Explanation:
Right hand thumb rule: thumb current, fingers curl gives field direction.

This question belongs to: Science Physics

Question #900

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A fuse is rated 5 A. Maximum power at 250 V that can be drawn is

A. 250 W

B. 5000 W

C. 1250 W

D. 50 W

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Correct Answer: Option C

Explanation:
P = V I = 250×5 = 1250 W.

This question belongs to: Science Physics

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