Physics MCQs

Question #781

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The maximum displacement of a particle from mean position in SHM is called

A. Amplitude

B. Time period

C. Wavelength

D. Frequency

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Correct Answer: Option A

Explanation:
Amplitude is max displacement.

This question belongs to: Science Physics

Question #782

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The principle of a pressure cooker is

A. Increase in pressure lowers boiling point

B. No effect on boiling point

C. Decrease in pressure raises boiling point

D. Increase in pressure raises boiling point

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Correct Answer: Option D

Explanation:
Higher pressure inside, boiling point >100°C, food cooks faster.

This question belongs to: Science Physics

Question #783

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The part of the electromagnetic spectrum used in remote controls is

A. Ultraviolet

B. Infrared

C. Radio wave

D. Microwave

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Correct Answer: Option B

Explanation:
TV remote uses IR. Not microwave (microwave oven).

This question belongs to: Science Physics

Question #784

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The scientist who gave the theory of relativity is

A. Newton

B. Planck

C. Einstein

D. Maxwell

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Correct Answer: Option C

Explanation:
Albert Einstein: special (1905) and general relativity (1915).

This question belongs to: Science Physics

Question #785

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Archimedes' principle is used in

A. Hydrometer

B. Barometer

C. Seismograph

D. Thermometer

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Correct Answer: Option A

Explanation:
Hydrometer floats based on density, uses buoyancy principle.

This question belongs to: Science Physics

Question #786

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The color of sky is blue due to

A. Dispersion

B. Refraction

C. Scattering

D. Reflection

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Correct Answer: Option C

Explanation:
Rayleigh scattering of sunlight by air molecules, blue scattered most.

This question belongs to: Science Physics

Question #787

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The terminal potential difference of a cell is less than its emf due to

A. External resistance

B. Overcharging

C. Low temperature

D. Internal resistance

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Correct Answer: Option D

Explanation:
V = E - Ir, drop across internal resistance.

This question belongs to: Science Physics

Question #788

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A 12 V battery with internal resistance 0.5 Ω delivers current 2 A. Terminal voltage is

A. 11 V

B. 10 V

C. 12 V

D. 13 V

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Correct Answer: Option A

Explanation:
V = E - Ir = 12 - 2×0.5 = 11 V.

This question belongs to: Science Physics

Question #789

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One micron is equal to

A. 10⁻⁹ m

B. 10⁻⁶ m

C. 10⁻¹⁰ m

D. 10⁻³ m

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Correct Answer: Option B

Explanation:
Micron or micrometer = 10⁻⁶ m.

This question belongs to: Science Physics

Question #790

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The mass of an electron is approximately

A. 9.11 × 10⁻²⁷ kg

B. 1.67 × 10⁻³¹ kg

C. 1.67 × 10⁻²⁷ kg

D. 9.11 × 10⁻³¹ kg

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Correct Answer: Option D

Explanation:
Electron mass 9.11×10⁻³¹ kg, proton ~1.67×10⁻²⁷ kg.

This question belongs to: Science Physics

Question #791

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A car accelerates from rest at 4 m/s² for 5 s, then moves at constant velocity for 5 s. Total distance is

A. 150 m

B. 100 m

C. 200 m

D. 50 m

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Correct Answer: Option A

Explanation:
Phase 1: s1 = ½×4×25 = 50 m, v=20 m/s. Phase 2: s2 = 20×5 = 100 m. Total 150 m.

This question belongs to: Science Physics

Question #792

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A body starts from rest and moves with uniform acceleration. The ratio of distances covered in 1st, 2nd, and 3rd seconds is

A. 1:3:5

B. 1:1:1

C. 1:2:3

D. 1:4:9

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Correct Answer: Option A

Explanation:
s_nth = u + a/2 (2n-1). u=0, so distances proportional to (2n-1): 1,3,5.

This question belongs to: Science Physics

Question #793

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A stone is dropped from a tower reaches ground in 4 s. Height of tower (g=10) is

A. 40 m

B. 20 m

C. 160 m

D. 80 m

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Correct Answer: Option D

Explanation:
h = ½ g t² = ½×10×16 = 80 m.

This question belongs to: Science Physics

Question #794

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The slope of a distance-time graph for a body at rest is

A. Infinity

B. Positive

C. Zero

D. Negative

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Correct Answer: Option C

Explanation:
Horizontal line, slope zero.

This question belongs to: Science Physics

Question #795

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A body moves along a straight line with v = 2t + 3. Acceleration after 2 s is

A. 3 m/s²

B. 7 m/s²

C. 2 m/s²

D. 5 m/s²

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Correct Answer: Option C

Explanation:
a = dv/dt = 2, constant.

This question belongs to: Science Physics

Question #796

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The weight of a body at Earth's centre is

A. Same as surface

B. Maximum

C. Zero

D. Half of surface

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Correct Answer: Option C

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

This question belongs to: Science Physics

Question #797

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Two bodies of masses m and 2m are dropped from a height. Neglecting air resistance, which hits first?

A. Both same

B. 2m

C. Depends on height

D. m

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Correct Answer: Option A

Explanation:
Acceleration g same for all masses in vacuum.

This question belongs to: Science Physics

Question #798

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Escape velocity of a body from Earth is 11.2 km/s. For a planet with mass 9 times Earth and radius same, escape velocity is

A. 33.6 km/s

B. 11.2 km/s

C. 3.73 km/s

D. 22.4 km/s

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Correct Answer: Option A

Explanation:
v_esc ∝ √M. M'=9M => v'=3×11.2=33.6 km/s.

This question belongs to: Science Physics

Question #799

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A hydraulic lift has area ratio of output to input piston 10:1. Force applied 50 N on input piston lifts weight of

A. 500 N

B. 50 N

C. 5 N

D. 5000 N

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Correct Answer: Option A

Explanation:
F1/A1 = F2/A2 => F2 = (A2/A1) F1 = 10×50 = 500 N.

This question belongs to: Science Physics

Question #800

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The density of a substance is 8 g/cm³. In SI, it is

A. 8000 kg/m³

B. 8 kg/m³

C. 800 kg/m³

D. 80 kg/m³

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Correct Answer: Option A

Explanation:
1 g/cm³ = 1000 kg/m³, so 8 g/cm³ = 8000 kg/m³.

This question belongs to: Science Physics

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