Physics MCQs

Question #701

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The weight of a body on moon is 1/6 of its weight on Earth. If a person weighs 60 kg on Earth, mass on moon is

A. 360 kg

B. 10 kg

C. 60 kg

D. 6 kg

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Correct Answer: Option C

Explanation:
Mass is constant, weight changes. 60 kg mass, weight 588 N on Earth, 98 N on moon.

This question belongs to: Science Physics

Question #702

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Escape velocity from a planet depends on

A. Mass of escaping body

B. Density of atmosphere

C. Radius of planet only

D. Mass and radius of planet

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Correct Answer: Option D

Explanation:
v_esc = √(2GM/R), depends on planet's mass and radius, not body's mass.

This question belongs to: Science Physics

Question #703

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A satellite in a circular orbit of radius R has period T. For radius 4R, period is

A. 8T

B. 4T

C. T/2

D. 2T

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Correct Answer: Option A

Explanation:
Kepler's 3rd law: T² ∝ R³ => T' = T (4)^(3/2) = T×8 = 8T.

This question belongs to: Science Physics

Question #704

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Atmospheric pressure at sea level is 1.013×10⁵ Pa. Equivalent height of mercury column (density 13600 kg/m³, g=9.8) is

A. 7.6 m

B. 0.76 cm

C. 13.6 m

D. 0.76 m

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Correct Answer: Option D

Explanation:
P = ρgh => h = P/(ρg) = 1.013×10⁵/(13600×9.8) ≈ 0.76 m = 76 cm.

This question belongs to: Science Physics

Question #705

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Which principle explains the working of hydraulic brakes?

A. Pascal

B. Archimedes

C. Bernoulli

D. Newton

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Correct Answer: Option A

Explanation:
Pascal's law: pressure applied enclosed fluid transmits undiminished. Hydraulic brakes, lift.

This question belongs to: Science Physics

Question #706

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A body of volume 100 cm³ and density 0.8 g/cm³ floats in water. Volume submerged is

A. 50 cm³

B. 80 cm³

C. 20 cm³

D. 100 cm³

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Correct Answer: Option B

Explanation:
Weight = buoyancy => ρ_obj V_total g = ρ_water V_sub g => 0.8×100 = 1×V_sub => V_sub = 80 cm³.

This question belongs to: Science Physics

Question #707

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A ship entering a river from sea will

A. Sink a little

B. Rise a little

C. Sink completely

D. Remain same

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Correct Answer: Option A

Explanation:
Seawater density > river water. To displace same weight, ship sinks deeper in less dense river water.

This question belongs to: Science Physics

Question #708

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The instrument to measure pressure difference is

A. Barometer

B. Manometer

C. Hydrometer

D. Aneroid barometer

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Correct Answer: Option B

Explanation:
Manometer measures pressure difference, often U-tube. Barometer measures atmospheric pressure.

This question belongs to: Science Physics

Question #709

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Heat required to convert 1 g of ice at 0°C to water at 0°C is (latent heat 80 cal/g)

A. 540 cal

B. 80 cal

C. 1 cal

D. 100 cal

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Correct Answer: Option B

Explanation:
Latent heat of fusion of ice = 80 cal/g. So 1 g needs 80 cal. No temperature change.

This question belongs to: Science Physics

Question #710

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Specific heat capacity of water is 1 cal/g°C. Heat required to raise temperature of 200 g water from 25°C to 35°C is

A. 2000 cal

B. 1000 cal

C. 200 cal

D. 5000 cal

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Correct Answer: Option A

Explanation:
Q = m c ΔT = 200 × 1 × 10 = 2000 cal.

This question belongs to: Science Physics

Question #711

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A gap is left between railway tracks to allow for

A. Weight of train

B. Expansion in summer

C. Vibration

D. Contraction in summer

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Correct Answer: Option B

Explanation:
Thermal expansion. Rails expand in summer heat, gap prevents buckling. Linear expansion ΔL = α L ΔT.

This question belongs to: Science Physics

Question #712

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Mercury is used in thermometers because it

A. Has low boiling point

B. Wets glass

C. Has uniform expansion and is opaque

D. Is transparent

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Correct Answer: Option C

Explanation:
Mercury has uniform thermal expansion, visible, high boiling point (357°C). Does not wet glass.

This question belongs to: Science Physics

Question #713

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Land breeze blows at night because

A. Land is hot

B. Earth rotation

C. Sea cools faster than land

D. Land cools faster than sea

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Correct Answer: Option D

Explanation:
At night land cools quickly, high pressure over land, low over sea, wind from land to sea. Sea breeze opposite.

This question belongs to: Science Physics

Question #714

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The frequency of a sound wave is 500 Hz and wavelength 0.68 m. Speed is

A. 680 m/s

B. 340 m/s

C. 34 m/s

D. 170 m/s

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Correct Answer: Option B

Explanation:
v = f λ = 500 × 0.68 = 340 m/s, typical speed of sound in air.

This question belongs to: Science Physics

Question #715

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A sound wave has time period 0.01 s. Its frequency is

A. 1000 Hz

B. 0.1 Hz

C. 100 Hz

D. 10 Hz

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Correct Answer: Option C

Explanation:
f = 1/T = 1/0.01 = 100 Hz.

This question belongs to: Science Physics

Question #716

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An ultrasound wave has frequency 2 MHz. Time period is

A. 0.5 ms

B. 2 μs

C. 0.5 μs

D. 2 ms

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Correct Answer: Option C

Explanation:
T = 1/(2×10⁶) = 0.5×10⁻⁶ s = 0.5 μs.

This question belongs to: Science Physics

Question #717

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The minimum distance to hear an echo (persistence of hearing 0.1 s, speed 340 m/s) is

A. 17 m

B. 34 m

C. 68 m

D. 10 m

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Correct Answer: Option A

Explanation:
d = (v×t)/2 = (340×0.1)/2 = 17 m.

This question belongs to: Science Physics

Question #718

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The characteristic of sound that distinguishes between two sounds of same pitch and loudness is

A. Frequency

B. Quality

C. Wavelength

D. Intensity

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Correct Answer: Option B

Explanation:
Timbre or quality depends on waveform/harmonics. Different instruments same note sound different.

This question belongs to: Science Physics

Question #719

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An object is placed at 2F of a convex lens. Image formed is

A. Virtual, erect, magnified

B. Virtual, inverted, same size

C. Real, inverted, diminished

D. Real, inverted, same size

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Correct Answer: Option D

Explanation:
At 2F, image also at 2F, real inverted same size. Used in photocopiers.

This question belongs to: Science Physics

Question #720

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The human eye forms image on

A. Iris

B. Cornea

C. Pupil

D. Retina

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Correct Answer: Option D

Explanation:
Retina contains rods and cones. Cornea and lens focus, iris controls light.

This question belongs to: Science Physics

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