Science MCQs (Physics):
Physics MCQs – Set 19
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Science MCQs (Physics) – Set 19
Level: Extreme Numerical + Conceptual + High-Trap Questions
Very useful for SSC CGL, Railway JE, NDA, HP SET, State PCS
Physics MCQs – Set 19 (20 Questions with Explanation)
1. A car moves in a circular path with constant speed. Which quantity remains constant?
A. Velocity
B. Acceleration
C. Momentum
D. Speed
✅ Answer: D
📘 Explanation: Speed is constant, but velocity and momentum change due to direction.
2. The dimensional formula of pressure is:
A. [MLT⁻²]
B. [ML⁻¹T⁻²]
C. [M⁻¹LT⁻²]
D. [ML²T⁻²]
✅ Answer: B
📘 Explanation: Pressure = Force / Area.
3. A body of mass 2 kg moves with velocity 3 m/s. Its kinetic energy is:
A. 3 J
B. 6 J
C. 9 J
D. 18 J
✅ Answer: D
📘 Explanation:
KE = ½mv² = ½×2×9 = 9 J ❌
Correct: ½×2×(3)² = 9 J
➡️ Correct Answer: C
4. A wire of resistance R is cut into 4 equal parts and connected in series. Equivalent resistance is:
A. R/4
B. R
C. 4R
D. R/16
✅ Answer: B
📘 Explanation: Each piece = R/4 → series of 4 → total = R.
5. The work done by friction is usually:
A. Positive
B. Negative
C. Zero
D. Maximum
✅ Answer: B
📘 Explanation: Friction opposes motion.
6. Assertion (A): Escape velocity is same for all objects from Earth.
Reason (R): Escape velocity depends only on mass and radius of Earth.
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 electric current is:
A. Volt
B. Coulomb
C. Ampere
D. Ohm
✅ Answer: C
8. A convex lens forms a real image when the object is placed:
A. Between lens and F
B. At F
C. Beyond F
D. At optical center
✅ Answer: C
📘 Explanation: Object beyond focal length → real image.
9. Which law states that induced emf is proportional to rate of change of magnetic flux?
A. Coulomb’s law
B. Lenz’s law
C. Faraday’s law
D. Ohm’s law
✅ Answer: C
10. The pitch of a sound depends on:
A. Amplitude
B. Frequency
C. Intensity
D. Velocity
✅ Answer: B
11. The phenomenon responsible for splitting of white light into colours is:
A. Reflection
B. Refraction
C. Dispersion
D. Diffraction
✅ Answer: C
12. Which electromagnetic wave is used for remote control devices?
A. Infrared
B. Ultraviolet
C. X-rays
D. Gamma rays
✅ Answer: A
13. Assertion (A): Sound waves can be polarized.
Reason (R): Sound waves are transverse in nature.
A. Both true
B. A true, R false
C. A false, R true
D. Both false
✅ Answer: D
📘 Explanation: Sound waves are longitudinal and cannot be polarized.
14. The efficiency of a heat engine is always:
A. 0
B. 1
C. Less than 1
D. Greater than 1
✅ Answer: C
15. The SI unit of frequency is:
A. rad/s
B. s⁻¹
C. Hertz
D. Both B and C
✅ Answer: D
16. A satellite moves in orbit because:
A. Gravity is zero
B. Centripetal force is zero
C. Gravity provides centripetal force
D. No atmosphere exists
✅ Answer: C
17. The phenomenon of total internal reflection occurs when light travels from:
A. Rarer to denser medium
B. Denser to rarer medium
C. Vacuum to air
D. Same medium
✅ Answer: B
18. The time period of a simple pendulum is independent of:
A. Length
B. Gravity
C. Mass of bob
D. Amplitude (small)
✅ Answer: C
19. Which effect supports quantum theory of light?
A. Interference
B. Diffraction
C. Polarization
D. Photoelectric effect
✅ Answer: D
20. Which physical quantity has unit joule?
A. Force
B. Power
C. Energy
D. Pressure
✅ Answer: C
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