Science MCQs (Physics):
Physics MCQs – Set 15
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Science MCQs (Physics) – Set 15
Level: Extreme + Numerical + Conceptual + Exam Traps
Highly useful for SSC CGL, Railway JE, NDA, HP SET, State PCS
Physics MCQs – Set 15 (20 Questions with Explanation)
1. A particle is projected vertically upward with velocity u. The maximum height reached is:
A. u²/g
B. u²/2g
C. u/g
D. 2u²/g
✅ Answer: B
📘 Explanation:
From v² = u² − 2gh, at top v = 0 → h = u²/2g.
2. The SI unit of angular velocity is:
A. m/s
B. rad/s
C. rad
D. s⁻¹
✅ Answer: B
📘 Explanation:
Angular velocity = angle/time.
3. If the length of a conductor is doubled and area is halved, its resistance becomes:
A. 2R
B. 4R
C. 6R
D. 8R
✅ Answer: D
📘 Explanation:
R ∝ L/A → (2)/(½) = 4 ❌
But area halved → A/2, length doubled → 2L
R' = ρ(2L)/(A/2) = 4R
➡️ Correct Answer: B. 4R
4. The work done by gravitational force on a freely falling body is:
A. Positive
B. Negative
C. Zero
D. Maximum
✅ Answer: A
📘 Explanation:
Force and displacement are in same direction.
5. Assertion (A): Kinetic energy depends on square of velocity.
Reason (R): KE = ½mv².
A. Both true, R correct explanation
B. Both true, R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
6. The dimensional formula of power is:
A. [MLT⁻¹]
B. [ML²T⁻³]
C. [ML²T⁻²]
D. [MT⁻²]
✅ Answer: B
📘 Explanation:
Power = work/time.
7. A body moving with constant velocity has:
A. Zero acceleration
B. Constant force
C. Increasing momentum
D. Variable speed
✅ Answer: A
8. The focal length of a convex lens is:
A. Negative
B. Zero
C. Positive
D. Infinite
✅ Answer: C
9. Which quantity remains conserved in all types of collisions?
A. Kinetic energy
B. Mechanical energy
C. Velocity
D. Momentum
✅ Answer: D
10. The SI unit of electric charge is:
A. Volt
B. Ampere
C. Coulomb
D. Ohm
✅ Answer: C
11. Assertion (A): Sound travels faster in solids than in gases.
Reason (R): Elasticity is higher in solids.
A. Both true, R correct explanation
B. Both true, R not explanation
C. A true, R false
D. A false, R true
✅ Answer: A
12. The refractive index of glass is maximum for:
A. Red
B. Yellow
C. Green
D. Violet
✅ Answer: D
13. Which law explains conservation of energy?
A. Newton’s law
B. Joule’s law
C. Law of thermodynamics
D. First law of thermodynamics
✅ Answer: D
14. A transformer works on the principle of:
A. Self induction
B. Mutual induction
C. Electromagnetic induction
D. Electrostatics
✅ Answer: B
15. The unit of magnetic flux density is:
A. Weber
B. Tesla
C. Henry
D. Ampere
✅ Answer: B
16. Which electromagnetic wave is used in radar?
A. Infrared
B. Ultraviolet
C. Microwaves
D. Gamma rays
✅ Answer: C
17. The efficiency of a Carnot engine depends on:
A. Working substance
B. Pressure
C. Temperature of source and sink
D. Volume
✅ Answer: C
18. A concave mirror produces a virtual image when the object is:
A. Beyond C
B. At C
C. Between F and C
D. Between F and P
✅ Answer: D
19. The pitch of sound depends upon:
A. Amplitude
B. Frequency
C. Velocity
D. Wavelength
✅ Answer: B
20. Which phenomenon proves particle nature of light?
A. Interference
B. Diffraction
C. Polarization
D. Photoelectric effect
✅ Answer: D
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