Science MCQs (Physics):
Physics MCQs – Set 9
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Science MCQs (Physics) – Set 9
Level: Assertion–Reason + Concept-Trap (High Level)
Very useful for SSC, Railway, HP SET, NDA, State PCS
Physics MCQs – Set 9 (20 Questions with Explanation)
Directions (Assertion–Reason):
Choose the correct option:
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false but R is true
1.
Assertion (A): A body moving in a circular path has acceleration.
Reason (R): The direction of velocity changes continuously.
✅ Answer: A
📘 Explanation: Change in direction causes centripetal acceleration.
2.
Assertion (A): The weight of an astronaut is zero in a satellite.
Reason (R): There is no gravitational force in space.
✅ Answer: C
📘 Explanation: Gravity exists; weightlessness is due to free fall.
3.
Assertion (A): The resistance of a conductor increases with temperature.
Reason (R): Collision of electrons with atoms increases.
✅ Answer: A
📘 Explanation: More collisions increase resistance.
4.
Assertion (A): Sound cannot travel in vacuum.
Reason (R): Sound waves require a material medium.
✅ Answer: A
📘 Explanation: Sound is a mechanical wave.
5.
Assertion (A): Convex mirrors are used as rear-view mirrors.
Reason (R): They form virtual, erect images and have a wide field of view.
✅ Answer: A
📘 Explanation: Wide field of view helps drivers.
6.
Assertion (A): The time period of a simple pendulum is independent of mass.
Reason (R): Time period depends on length and gravity.
✅ Answer: A
📘 Explanation: T = 2π√(l/g).
7.
Assertion (A): A transformer cannot work on DC supply.
Reason (R): DC does not produce changing magnetic flux.
✅ Answer: A
📘 Explanation: Changing flux is required for induction.
8.
Assertion (A): The boiling point of water increases at high altitude.
Reason (R): Atmospheric pressure decreases with altitude.
✅ Answer: D
📘 Explanation: Lower pressure lowers boiling point.
9.
Assertion (A): Light waves can travel through vacuum.
Reason (R): Light is an electromagnetic wave.
✅ Answer: A
📘 Explanation: EM waves do not need a medium.
10.
Assertion (A): The pitch of sound depends on frequency.
Reason (R): Frequency determines the number of vibrations per second.
✅ Answer: A
📘 Explanation: Higher frequency → higher pitch.
11.
Assertion (A): Work done by centripetal force is zero.
Reason (R): Centripetal force is perpendicular to velocity.
✅ Answer: A
📘 Explanation: No work if force ⟂ displacement.
12.
Assertion (A): The speed of sound is greater in solids than in gases.
Reason (R): Particles are closely packed in solids.
✅ Answer: A
📘 Explanation: Elasticity is higher in solids.
13.
Assertion (A): Electric power is the rate of doing work.
Reason (R): Power = Energy/Time.
✅ Answer: A
📘 Explanation: Definition of power.
14.
Assertion (A): In series connection, current remains same in all resistors.
Reason (R): Only one path is available for current.
✅ Answer: A
📘 Explanation: Series circuit has single path.
15.
Assertion (A): The refractive index of a medium depends on wavelength.
Reason (R): Speed of light in medium varies with wavelength.
✅ Answer: A
📘 Explanation: n = c/v, v varies with wavelength.
16.
Assertion (A): The kinetic energy of a body can never be negative.
Reason (R): Kinetic energy depends on square of velocity.
✅ Answer: A
📘 Explanation: v² is always positive.
17.
Assertion (A): Gamma rays have maximum penetrating power.
Reason (R): They have highest frequency and energy.
✅ Answer: A
📘 Explanation: Higher energy → higher penetration.
18.
Assertion (A): The escape velocity of Earth is independent of mass of body.
Reason (R): Escape velocity depends only on Earth’s mass and radius.
✅ Answer: A
📘 Explanation: Mass of escaping body cancels out.
19.
Assertion (A): Heat flows from hot body to cold body.
Reason (R): Due to temperature difference.
✅ Answer: A
📘 Explanation: Basic law of heat transfer.
20.
Assertion (A): A hydrometer floats higher in salt water than in fresh water.
Reason (R): Density of salt water is higher.
✅ Answer: A
📘 Explanation: Higher density gives more buoyant force.
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