Science MCQs (Physics):
Physics MCQs – Set 17
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Science MCQs (Physics) – Set 17
Level: Numerical-Heavy + Conceptual Traps (Very High Level)
Best for SSC CGL, Railway JE, NDA, HP SET, State PCS
Physics MCQs – Set 17 (20 Questions with Explanation)
1. A stone is dropped from rest. The distance covered in the 5th second is:
A. 12.25 m
B. 22.05 m
C. 42.25 m
D. 49.0 m
✅ Answer: A
📘 Explanation:
Distance in nth second = g(2n−1)/2
For n = 5 → = 9.8×9/2 = 44.1/2 = 22.05 m ❌
Using g = 9.8: (2×5−1)=9 → (9.8×9)/2 = 44.1 m ❌
Using g = 9.8 incorrectly—standard exam uses g = 9.8:
Correct value ≈ 22.05 m
➡️ Correct Answer: B
2. The unit of impulse is:
A. N
B. N·s
C. J
D. kg
✅ Answer: B
📘 Explanation: Impulse = Force × Time.
3. If velocity of a body is doubled, its kinetic energy becomes:
A. Double
B. Half
C. Four times
D. Eight times
✅ Answer: C
📘 Explanation: KE ∝ v².
4. A wire of resistance R is bent to form a circle. The new resistance is:
A. R
B. 2R
C. R/2
D. 4R
✅ Answer: A
📘 Explanation: Length and area unchanged → resistance same.
5. The work done by centripetal force is:
A. Maximum
B. Minimum
C. Zero
D. Infinite
✅ Answer: C
6. Assertion (A): Pressure in a liquid increases with depth.
Reason (R): Density and gravitational acceleration are constant.
A. Both true, R correct explanation
B. Both true, R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
7. The dimensional formula of electric potential is:
A. [ML²T⁻²A⁻¹]
B. [ML²T⁻³A⁻¹]
C. [MLT⁻²A⁻¹]
D. [ML²T⁻¹A⁻¹]
✅ Answer: B
📘 Explanation:
V = Work/Charge.
8. A convex lens has focal length 20 cm. The power of the lens is:
A. +2 D
B. +4 D
C. +5 D
D. +10 D
✅ Answer: C
📘 Explanation:
Power = 1/f (in meters) = 1/0.2 = +5 D.
9. Which law explains the working of a transformer?
A. Ohm’s law
B. Joule’s law
C. Faraday’s law
D. Lenz’s law
✅ Answer: C
10. The pitch of sound depends upon:
A. Amplitude
B. Frequency
C. Velocity
D. Wavelength
✅ Answer: B
11. A satellite appears weightless because:
A. No gravity
B. No mass
C. It is in free fall
D. No atmosphere
✅ Answer: C
12. The unit of magnetic flux is:
A. Tesla
B. Weber
C. Henry
D. Ampere
✅ Answer: B
13. Which electromagnetic wave is used in radar?
A. Infrared
B. Ultraviolet
C. Microwaves
D. Gamma rays
✅ Answer: C
14. The efficiency of a Carnot engine depends on:
A. Pressure
B. Volume
C. Working substance
D. Temperature of source and sink
✅ Answer: D
15. Assertion (A): Sound waves cannot be polarized.
Reason (R): Sound waves are longitudinal.
A. Both true, R correct explanation
B. Both true, R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
16. The phenomenon responsible for the blue color of sky is:
A. Reflection
B. Refraction
C. Dispersion
D. Scattering
✅ Answer: D
17. The time period of a simple pendulum depends on:
A. Mass of bob
B. Amplitude
C. Length of pendulum
D. Shape of bob
✅ Answer: C
18. The SI unit of electric charge is:
A. Volt
B. Ampere
C. Coulomb
D. Ohm
✅ Answer: C
19. Which phenomenon proves particle nature of light?
A. Interference
B. Diffraction
C. Polarization
D. Photoelectric effect
✅ Answer: D
20. Which physical quantity has the same unit as torque?
A. Power
B. Work
C. Energy
D. Momentum
✅ Answer: B
📘 Explanation: Both torque and work have unit N·m (nature different).
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