Science MCQs (Physics):
Physics MCQs – Set 12
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Science MCQs (Physics) – Set 12
Level: Ultra-Tricky + Numerical + Conceptual (Exam Oriented)
Best for SSC, Railway, NDA, HP SET, State PCS
Physics MCQs – Set 12 (20 Questions with Explanation)
1. If acceleration due to gravity on a planet is double that of Earth, the time period of a simple pendulum will be:
A. √2 times
B. 1/√2 times
C. 2 times
D. 1/2 times
✅ Answer: B
📘 Explanation:
T = 2π√(L/g) → T ∝ 1/√g.
2. The SI unit of coefficient of viscosity is:
A. Pascal
B. Pascal-second
C. N/m²
D. kg/m
✅ Answer: B
📘 Explanation:
Viscosity unit = Pa·s.
3. The escape velocity of Earth is independent of:
A. Mass of Earth
B. Radius of Earth
C. Mass of body
D. Gravitational constant
✅ Answer: C
📘 Explanation:
vₑ = √(2GM/R).
4. A wire is stretched to double its length. Its resistance becomes:
A. 2R
B. 4R
C. 6R
D. 8R
✅ Answer: B
📘 Explanation:
Volume constant → R ∝ L² → (2L)² = 4R.
5. The work done by centripetal force is:
A. Maximum
B. Minimum
C. Zero
D. Infinite
✅ Answer: C
📘 Explanation:
Centripetal force ⟂ velocity → no work done.
6. Which law explains the working of a rocket?
A. Newton’s First Law
B. Newton’s Second Law
C. Newton’s Third Law
D. Law of Gravitation
✅ Answer: C
📘 Explanation:
Action–reaction principle.
7. The dimensional formula of magnetic flux is:
A. [ML²T⁻²A⁻¹]
B. [ML²T⁻²]
C. [MLT⁻²A⁻¹]
D. [ML²T⁻¹A⁻¹]
✅ Answer: A
📘 Explanation:
Φ = B × Area, B = Tesla.
8. If frequency of AC supply is increased, inductive reactance will:
A. Decrease
B. Increase
C. Remain same
D. Become zero
✅ Answer: B
📘 Explanation:
XL = 2πfL.
9. The image formed by a plane mirror is always:
A. Real
B. Inverted
C. Virtual and erect
D. Diminished
✅ Answer: C
📘 Explanation:
Plane mirror forms virtual erect image.
10. Which gas shows maximum deviation from ideal gas behavior?
A. Hydrogen
B. Oxygen
C. Nitrogen
D. Carbon dioxide
✅ Answer: D
📘 Explanation:
Greater intermolecular forces → more deviation.
11. The unit of electric field intensity is:
A. Volt
B. Volt/meter
C. Coulomb
D. Ampere
✅ Answer: B
📘 Explanation:
E = V/d.
12. The phenomenon used to explain mirage is:
A. Reflection
B. Diffraction
C. Dispersion
D. Total internal reflection
✅ Answer: D
📘 Explanation:
Hot air layers cause TIR.
13. A body floats in water with 25% of its volume above the surface. Density of body is:
A. 0.25ρ
B. 0.50ρ
C. 0.75ρ
D. ρ
✅ Answer: C
📘 Explanation:
Submerged volume = 75% → density = 0.75ρ.
14. The focal length of a concave lens is:
A. Positive
B. Negative
C. Zero
D. Infinite
✅ Answer: B
📘 Explanation:
Concave lens always has negative focal length.
15. The energy of a photon is directly proportional to its:
A. Velocity
B. Wavelength
C. Frequency
D. Amplitude
✅ Answer: C
📘 Explanation:
E = hν.
16. The efficiency of a Carnot engine depends on:
A. Working substance
B. Size of engine
C. Temperatures of source and sink
D. Pressure only
✅ Answer: C
📘 Explanation:
η = 1 − T₂/T₁.
17. Which electromagnetic wave has highest penetrating power?
A. X-rays
B. Ultraviolet
C. Infrared
D. Gamma rays
✅ Answer: D
📘 Explanation:
Gamma rays have highest energy.
18. The unit of capacitance is:
A. Ohm
B. Farad
C. Henry
D. Tesla
✅ Answer: B
📘 Explanation:
Capacitance unit = Farad.
19. A body moving with constant velocity has:
A. Zero acceleration
B. Increasing momentum
C. Decreasing energy
D. Variable force
✅ Answer: A
📘 Explanation:
Constant velocity → no acceleration.
20. Which phenomenon proves wave nature of light?
A. Photoelectric effect
B. Compton effect
C. Interference
D. Emission
✅ Answer: C
📘 Explanation:
Interference is a wave phenomenon.
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