Science MCQs (Physics):
Physics MCQs – Set 13
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Science MCQs (Physics) – Set 13
Level: Very High + Numerical + Assertion–Reason (Exam Focused)
Useful for SSC, Railway, NDA, HP SET, State PCS
Physics MCQs – Set 13 (20 Questions with Explanation)
1. Assertion (A): A body can have acceleration even when its speed is constant.
Reason (R): Acceleration depends on change in velocity, not speed alone.
A. Both A and R are true, and R is correct explanation
B. Both true, but R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
📘 Explanation: In circular motion, speed constant but velocity direction changes.
2. The dimensional formula of impulse is same as that of:
A. Force
B. Energy
C. Momentum
D. Power
✅ Answer: C
📘 Explanation:
Impulse = F·t = change in momentum.
3. A stone is thrown vertically upward. At the highest point:
A. Kinetic energy is maximum
B. Acceleration is zero
C. Velocity is zero
D. Momentum is maximum
✅ Answer: C
📘 Explanation: Acceleration due to gravity still acts downward.
4. If the length of a wire is doubled and radius is halved, new resistance is:
A. R
B. 2R
C. 4R
D. 8R
✅ Answer: D
📘 Explanation:
R ∝ L/r² → (2)/(½)² = 8R.
5. Assertion (A): No work is done by centripetal force.
Reason (R): Centripetal force is always perpendicular to velocity.
A. Both A and R true, R correct explanation
B. Both true, but R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
📘 Explanation: Work = F·v → zero when perpendicular.
6. The unit of magnetic field is:
A. Weber
B. Tesla
C. Henry
D. Ampere
✅ Answer: B
📘 Explanation: Magnetic field unit = Tesla.
7. When temperature of a conductor increases, its resistance:
A. Decreases
B. Increases
C. Remains same
D. Becomes zero
✅ Answer: B
📘 Explanation: Thermal agitation increases opposition.
8. The escape velocity of a planet depends on:
A. Mass of body
B. Shape of planet
C. Mass and radius of planet
D. Atmospheric pressure
✅ Answer: C
📘 Explanation: vₑ = √(2GM/R).
9. Which phenomenon explains rainbow formation?
A. Reflection only
B. Refraction only
C. Dispersion and total internal reflection
D. Scattering
✅ Answer: C
📘 Explanation: Multiple optical effects.
10. The unit of power is:
A. Joule
B. Newton
C. Watt
D. Ampere
✅ Answer: C
📘 Explanation: Power = work/time.
11. Assertion (A): Sound cannot travel in vacuum.
Reason (R): Sound waves are mechanical waves.
A. Both true, R correct explanation
B. Both true, R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
📘 Explanation: Mechanical waves need medium.
12. The refractive index of glass is highest for:
A. Red
B. Yellow
C. Blue
D. Violet
✅ Answer: D
📘 Explanation: Higher frequency → more bending.
13. Which law gives direction of induced current?
A. Fleming’s left-hand rule
B. Fleming’s right-hand rule
C. Faraday’s law
D. Lenz’s law
✅ Answer: D
📘 Explanation: Lenz’s law gives direction.
14. A transformer cannot work on:
A. AC supply
B. DC supply
C. High voltage
D. Low voltage
✅ Answer: B
📘 Explanation: No changing flux in DC.
15. The SI unit of pressure is:
A. Bar
B. Pascal
C. Atmosphere
D. mmHg
✅ Answer: B
📘 Explanation: SI unit = Pascal.
16. The loudness of sound depends on:
A. Frequency
B. Wavelength
C. Amplitude
D. Velocity
✅ Answer: C
📘 Explanation: Loudness ∝ amplitude.
17. Assertion (A): Total energy of an isolated system remains constant.
Reason (R): Energy can neither be created nor destroyed.
A. Both true, R correct explanation
B. Both true, R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
📘 Explanation: Law of conservation of energy.
18. The phenomenon responsible for mirage is:
A. Reflection
B. Refraction
C. Diffraction
D. Total internal reflection
✅ Answer: D
📘 Explanation: Caused by hot air layers.
19. The time period of a simple pendulum depends on:
A. Mass of bob
B. Amplitude
C. Length of string
D. Shape of bob
✅ Answer: C
📘 Explanation: T = 2π√(L/g).
20. Which effect confirms particle nature of light?
A. Interference
B. Diffraction
C. Polarization
D. Photoelectric effect
✅ Answer: D
📘 Explanation: Photon concept.
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