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 9ā€“12, NEET, JEE, CUET, SSC, Banking, Railway, JKSSB, Defence, Police, and other competitive exams.

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Page 25 of 65
Question #481
The velocity of sound is maximum in
A. Air
B. Water
C. Vacuum
D. Steel
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Correct Answer: Option D

Explanation:
Speed of sound: solids > liquids > gases. In steel ~5000 m/s, water ~1500 m/s, air ~340 m/s. Vacuum no propagation. Speed depends on density and elasticity.
This question belongs to: Science Physics
Question #482
Which of the following is a good insulator?
A. Rubber
B. Copper
C. Silver
D. Graphite
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Correct Answer: Option A

Explanation:
Rubber has no free electrons, high resistivity. Silver best conductor. Copper widely used conductor. Graphite conducts (non-metal). Insulators: glass, plastic, wood.
This question belongs to: Science Physics
Question #483
The weight of a body is maximum at
A. Centre of Earth
B. Poles
C. Equator
D. Same everywhere
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Correct Answer: Option B

Explanation:
g_pole > g_equator due to less centrifugal effect and Earth's oblateness. At centre g=0, weightless. So weight max at poles.
This question belongs to: Science Physics
Question #484
The formula for kinetic energy is
A. ma
B. mv
C. mgh
D. Ā½mvĀ²
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Correct Answer: Option D

Explanation:
Kinetic energy due to motion. Potential mgh. Momentum mv. Force ma. Work-energy theorem: W = Ī”K. Units Joules.
This question belongs to: Science Physics
Question #485
A convex mirror is used as a rear-view mirror because it
A. Gives real image
B. Inverts image
C. Gives wider field of view
D. Magnifies image
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Correct Answer: Option C

Explanation:
Convex mirror diverges rays, gives erect, diminished, virtual image with wider field. Concave would magnify but narrow field. Plane gives normal view. Safety advantage.
This question belongs to: Science Physics
Question #486
The SI unit of electric current is
A. Ohm
B. Coulomb
C. Ampere
D. Volt
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Correct Answer: Option C

Explanation:
Ampere (A) is base unit, defined via force between conductors. 1 A = 1 C/s. Coulomb is charge. Volt potential. Ohm resistance.
This question belongs to: Science Physics
Question #487
The process of a solid changing directly into gas is
A. Condensation
B. Evaporation
C. Sublimation
D. Melting
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Correct Answer: Option C

Explanation:
Sublimation: solid ā†’ gas. Example: dry ice (COā‚‚), camphor. Deposition is reverse (gas ā†’ solid). Melting solid ā†’ liquid, evaporation liquid ā†’ gas.
This question belongs to: Science Physics
Question #488
Which of the following is a non-contact force?
A. Friction
B. Normal force
C. Muscular force
D. Electrostatic force
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Correct Answer: Option D

Explanation:
Electrostatic force acts between charges at a distance without contact. Gravity, magnetic force also non-contact. Friction and normal require contact.
This question belongs to: Science Physics
Question #489
A transformer steps up 220 V to 2200 V. The turn ratio (secondary to primary) is
A. 1:10
B. 1:1
C. 10:1
D. 220:1
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Correct Answer: Option C

Explanation:
For ideal transformer, V_s/V_p = N_s/N_p. So N_s/N_p = 2200/220 = 10. So secondary turns 10 times primary. Ratio 10:1. Step-up increases voltage.
This question belongs to: Science Physics
Question #490
The nucleus of an atom contains
A. Electrons and neutrons
B. Electrons and protons
C. Protons and neutrons
D. Only neutrons
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Correct Answer: Option C

Explanation:
Protons (positive), neutrons (neutral). Electrons orbit outside. Hydrogen nucleus only proton. Heavy elements have more neutrons.
This question belongs to: Science Physics
Question #491
An object is placed between pole and focus of a concave mirror. The image is
A. Virtual, erect, enlarged
B. Virtual, inverted, diminished
C. Real, erect, enlarged
D. Real, inverted, enlarged
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Correct Answer: Option A

Explanation:
Object between P and F of concave mirror gives virtual, erect, magnified image behind mirror. Used in shaving mirror, dentist mirror. Ray diagram shows diverging rays appearing to come from behind.
This question belongs to: Science Physics
Question #492
The energy equivalent of 1 g mass is
A. 9Ɨ10Ā¹ā° J
B. 9Ɨ10Ā¹ā¶ J
C. 9Ɨ10Ā¹Ā³ J
D. 3Ɨ10āø J
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Correct Answer: Option C

Explanation:
E = mcĀ² = 0.001 kg Ɨ (3Ɨ10āø)Ā² = 0.001 Ɨ 9Ɨ10Ā¹ā¶ = 9Ɨ10Ā¹Ā³ J. Enormous energy. 1 g mass if fully converted gives this. Atomic bomb converts small fraction.
This question belongs to: Science Physics
Question #493
The unit of pressure in SI is
A. Pascal
B. Torr
C. Bar
D. Atmosphere
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Correct Answer: Option A

Explanation:
Pascal = N/mĀ². Named after Blaise Pascal. Bar = 10āµ Pa, atmosphere = 101325 Pa, torr = 133.3 Pa. SI unit is Pascal.
This question belongs to: Science Physics
Question #494
Which of the following colours of light has minimum wavelength?
A. Blue
B. Red
C. Green
D. Violet
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Correct Answer: Option D

Explanation:
Violet ~400 nm, shortest in visible. Red ~700 nm, longest. Order VIBGYOR. Shorter wavelength higher frequency, more energy. Ultraviolet beyond violet.
This question belongs to: Science Physics
Question #495
The resistance of a conducting wire is directly proportional to its
A. Cross-sectional area
B. Diameter
C. Volume
D. Length
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Correct Answer: Option D

Explanation:
R āˆ L, inversely proportional to A. Longer wire more resistance. Thicker wire less resistance. R = ĻL/A. Resistivity Ļ constant for material.
This question belongs to: Science Physics
Question #496
The temperature of a body is 86Ā°F. What is it in Celsius?
A. 40Ā°C
B. 25Ā°C
C. 30Ā°C
D. 20Ā°C
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Correct Answer: Option C

Explanation:
C = (F-32) Ɨ 5/9 = (86-32)Ɨ5/9 = 54Ɨ5/9 = 30Ā°C. Common conversion. 86Ā°F warm day. 32Ā°F = 0Ā°C.
This question belongs to: Science Physics
Question #497
Which of the following is an example of a third class lever?
A. Seesaw
B. Crowbar
C. Fishing rod
D. Scissors
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Correct Answer: Option C

Explanation:
In third class lever, effort between fulcrum and load. Fishing rod, tweezers, forearm. Scissors first class, crowbar first/second, seesaw first. Mechanical advantage
This question belongs to: Science Physics
Question #498
The half-life of a radioactive substance is 5 years. The fraction disintegrated after 15 years is
A. 7/8
B. 1/3
C. 1/2
D. 1/8
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Correct Answer: Option A

Explanation:
After 3 half-lives, remaining = (1/2)Ā³ = 1/8, so disintegrated = 1 - 1/8 = 7/8. Fraction disintegrated = 7/8. Option A remaining. So B.
This question belongs to: Science Physics
Question #499
The distance traveled by an object is directly obtained from
A. Acceleration-time graph
B. Displacement-time graph slope
C. Speed-time graph slope
D. Velocity-time graph area
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Correct Answer: Option D

Explanation:
Area under v-t graph gives displacement (distance if velocity doesn't change sign). Slope of x-t gives velocity. Slope of v-t gives acceleration. Area a-t gives change in velocity.
This question belongs to: Science Physics
Question #500
A person of mass 60 kg stands on a weighing scale in an elevator accelerating upward at 2 m/sĀ² (g=10). The reading is
A. 60 kg
B. 48 kg
C. 72 kg
D. 120 kg
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Correct Answer: Option C

Explanation:
Apparent weight = m(g+a) = 60Ɨ(10+2) = 720 N, which corresponds to 72 kg mass on scale (if scale calibrated in kg under g=10). Reading 72 kg. Downward acceleration would reduce.
This question belongs to: Science Physics

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