Science MCQs (Physics):
Physics MCQs – Set 14
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Science MCQs (Physics) – Set 14
Level: Ultra-Hard + Numerical + Conceptual Traps
Perfect for SSC CGL, Railway JE, NDA, HP SET, State PCS
Physics MCQs – Set 14 (20 Questions with Explanation)
1. A particle moves with uniform speed in a circular path. The acceleration is:
A. Zero
B. Constant in magnitude and direction
C. Constant in magnitude but changing in direction
D. Changing in both magnitude and direction
✅ Answer: C
📘 Explanation: Centripetal acceleration has constant magnitude but changing direction.
2. The unit of impulse is equal to the unit of:
A. Force
B. Work
C. Momentum
D. Energy
✅ Answer: C
📘 Explanation: Impulse = change in momentum.
3. A wire of resistance R is cut into 3 equal parts and connected in parallel. Equivalent resistance is:
A. R/3
B. R/9
C. R/27
D. 3R
✅ Answer: C
📘 Explanation: Each part has R/3 resistance.
Parallel of 3 equal resistances → Req = (R/3)/3 = R/9 ❌
But since length becomes 1/3 → resistance becomes R/3 each.
Parallel of 3 → Req = (R/3)/3 = R/9
➡️ Correct Answer: B. R/9
4. The work done in stretching a spring is proportional to:
A. Extension
B. Square of extension
C. Cube of extension
D. Inverse of extension
✅ Answer: B
📘 Explanation: W = ½kx².
5. Assertion (A): Escape velocity of a body depends on its mass.
Reason (R): Heavier bodies require more force to escape gravity.
A. Both A and R true
B. A true, R false
C. A false, R true
D. Both false
✅ Answer: C
📘 Explanation: Escape velocity is independent of mass of body.
6. The SI unit of electric power is:
A. Joule
B. Watt
C. Volt
D. Ampere
✅ Answer: B
📘 Explanation: Power = energy/time.
7. The refractive index of a medium is maximum for:
A. Red light
B. Yellow light
C. Green light
D. Violet light
✅ Answer: D
📘 Explanation: Shorter wavelength → higher refractive index.
8. A body is in equilibrium when:
A. Net force is maximum
B. Net torque is maximum
C. Net force and net torque are zero
D. Acceleration is maximum
✅ Answer: C
📘 Explanation: Equilibrium requires both translational and rotational balance.
9. Which device converts AC into DC?
A. Transformer
B. Rectifier
C. Generator
D. Motor
✅ Answer: B
📘 Explanation: Rectifier converts AC to DC.
10. The pitch of sound depends on:
A. Amplitude
B. Velocity
C. Frequency
D. Wavelength
✅ Answer: C
📘 Explanation: Pitch is determined by frequency.
11. A concave mirror forms a virtual image when the object is placed:
A. Beyond C
B. At C
C. Between F and C
D. Between P and F
✅ Answer: D
📘 Explanation: Object within focal length gives virtual image.
12. 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.
13. Assertion (A): Transformer works only on AC supply.
Reason (R): Changing current produces changing 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
📘 Explanation: AC causes changing flux necessary for induction.
14. The phenomenon responsible for blue colour of sky is:
A. Reflection
B. Dispersion
C. Refraction
D. Scattering
✅ Answer: D
📘 Explanation: Rayleigh scattering.
15. A satellite orbiting Earth appears weightless because:
A. Gravity is zero
B. Atmospheric pressure is zero
C. It is in free fall
D. It moves with constant velocity
✅ Answer: C
📘 Explanation: Continuous free fall.
16. Which electromagnetic wave has minimum wavelength?
A. X-rays
B. Gamma rays
C. Ultraviolet
D. Infrared
✅ Answer: B
📘 Explanation: Gamma rays have shortest wavelength.
17. The heating effect of current is given by:
A. VIt
B. I²Rt
C. V²Rt
D. IR²t
✅ Answer: B
📘 Explanation: Joule’s law of heating.
18. The unit of magnetic flux is:
A. Tesla
B. Henry
C. Weber
D. Ampere
✅ Answer: C
📘 Explanation: Magnetic flux unit = Weber.
19. The efficiency of a Carnot engine depends on:
A. Nature of gas
B. Pressure
C. Temperature of source and sink
D. Volume
✅ Answer: C
📘 Explanation: η = 1 − T₂/T₁.
20. Which phenomenon confirms wave nature of light?
A. Photoelectric effect
B. Compton effect
C. Interference
D. Emission
✅ Answer: C
📘 Explanation: Interference is wave property.
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