Science MCQs (Physics):
Physics MCQs – Set 18
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Science MCQs (Physics) – Set 18
Level: Very Hard Numerical + Conceptual + Exam Traps
Perfect for SSC CGL, Railway JE, NDA, HP SET, State PCS
Physics MCQs – Set 18 (20 Questions with Explanation)
1. A body is thrown vertically upward with speed 19.6 m/s. The maximum height reached is:
A. 9.8 m
B. 14.7 m
C. 19.6 m
D. 29.4 m
✅ Answer: A
📘 Explanation:
h = u²/2g = (19.6)² / (2×9.8) = 19.6 m ❌
Correct calculation:
(19.6×19.6)/(19.6) = 19.6/2 = 9.8 m
2. The dimensional formula of angular momentum is:
A. [ML²T⁻¹]
B. [MLT⁻²]
C. [ML²T⁻²]
D. [MLT⁻¹]
✅ Answer: A
📘 Explanation:
Angular momentum = r × p.
3. If the speed of a body is doubled, its momentum becomes:
A. Same
B. Half
C. Double
D. Four times
✅ Answer: C
4. A wire of resistance R is stretched to four times its original length. New resistance will be:
A. 4R
B. 8R
C. 16R
D. 32R
✅ Answer: C
📘 Explanation:
Volume constant → R ∝ L² → (4L)² = 16R.
5. The work done by centripetal force in circular motion is:
A. Maximum
B. Minimum
C. Zero
D. Infinite
✅ Answer: C
6. Assertion (A): Pressure in a liquid depends on depth.
Reason (R): Pressure = ρgh
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 SI unit of magnetic field intensity is:
A. Tesla
B. Weber
C. Ampere/meter
D. Henry
✅ Answer: C
📘 Explanation:
Magnetic field intensity H unit = A/m.
8. A convex mirror always forms an image that is:
A. Real and inverted
B. Virtual and erect
C. Real and erect
D. Virtual and inverted
✅ Answer: B
9. The frequency of AC supply in India is:
A. 25 Hz
B. 50 Hz
C. 60 Hz
D. 100 Hz
✅ Answer: B
10. Which law explains electromagnetic induction?
A. Ohm’s law
B. Faraday’s law
C. Coulomb’s law
D. Lenz’s law
✅ Answer: B
11. The pitch of sound depends on:
A. Amplitude
B. Velocity
C. Frequency
D. Intensity
✅ Answer: C
12. Which electromagnetic wave has the longest wavelength?
A. Gamma rays
B. X-rays
C. Infrared
D. Radio waves
✅ Answer: D
13. Assertion (A): Transformer cannot work on DC.
Reason (R): DC produces constant magnetic flux.
A. Both true, R correct explanation
B. Both true, R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
14. The efficiency of a Carnot engine depends on:
A. Working substance
B. Volume
C. Pressure
D. Temperature of source and sink
✅ Answer: D
15. The SI unit of electric power is:
A. Joule
B. Volt
C. Ampere
D. Watt
✅ Answer: D
16. A satellite appears weightless because:
A. No gravity
B. No mass
C. Continuous free fall
D. No atmosphere
✅ Answer: C
17. The phenomenon responsible for mirage is:
A. Reflection
B. Refraction
C. Diffraction
D. Total internal reflection
✅ Answer: D
18. The time period of a simple pendulum depends on:
A. Mass of bob
B. Shape of bob
C. Length of pendulum
D. Material of bob
✅ Answer: C
19. Which effect proves particle nature of light?
A. Interference
B. Diffraction
C. Polarization
D. Photoelectric effect
✅ Answer: D
20. Which quantity has the same unit as work?
A. Torque
B. Power
C. Momentum
D. Force
✅ Answer: A
📘 Explanation: Both work and torque have unit N·m (nature different).
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