Science MCQs (Physics):
Physics MCQs – Set 6
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Science MCQs (Physics) – Set 6
🚀 Level: Ultra-Hard / Numerical + Concept-Trap (Highest Exam Level)
Best for SSC (CGL), Railway (JE), HP SET, NDA, State PCS
Physics MCQs – Set 6 (20 Questions with Explanation)
1. A particle starts from rest and moves with constant acceleration. Its velocity after covering distance s is proportional to:
A. s
B. √s
C. s²
D. 1/s
✅ Answer: B
📘 Explanation:
From v² = u² + 2as, with u = 0 → v ∝ √s.
2. The dimensional formula of electric charge is:
A. [AT]
B. [A/T]
C. [MLT⁻²]
D. [M⁻¹L³T⁻²]
✅ Answer: A
📘 Explanation: Charge = Current × Time.
3. If the earth suddenly stops rotating, weight of a body at equator will:
A. Become zero
B. Increase
C. Decrease
D. Remain same
✅ Answer: B
📘 Explanation: Centrifugal force disappears, effective weight increases.
4. Two resistances R and 2R are connected in parallel. Equivalent resistance is:
A. 3R
B. 2R
C. 2R/3
D. R/3
✅ Answer: C
📘 Explanation:
1/Req = 1/R + 1/2R = 3/2R → Req = 2R/3.
5. A body moves in a straight line with velocity proportional to time. The motion is:
A. Uniform
B. Non-uniform
C. Uniformly accelerated
D. Retarded
✅ Answer: C
📘 Explanation: v ∝ t implies constant acceleration.
6. Which quantity remains constant in a transverse wave?
A. Particle velocity
B. Particle acceleration
C. Frequency
D. Amplitude
✅ Answer: C
📘 Explanation: Frequency is determined by the source.
7. A body of mass m is lifted to height h. If height is doubled, potential energy becomes:
A. Half
B. Same
C. Double
D. Four times
✅ Answer: C
📘 Explanation: PE = mgh → proportional to height.
8. Which electromagnetic wave has maximum penetrating power?
A. X-rays
B. Ultraviolet
C. Infrared
D. Gamma rays
✅ Answer: D
📘 Explanation: Gamma rays have highest energy and penetration.
9. The time period of a satellite near Earth’s surface depends on:
A. Mass of satellite
B. Radius of Earth
C. Height of satellite
D. Shape of satellite
✅ Answer: B
📘 Explanation: Near surface, orbit radius ≈ Earth’s radius.
10. A body floats in water with 25% of its volume above the surface. Relative density of the body is:
A. 0.25
B. 0.50
C. 0.75
D. 1.25
✅ Answer: C
📘 Explanation:
Fraction submerged = 75% → RD = 0.75.
11. Which graph represents constant power?
A. Force–velocity
B. Velocity–time
C. Force–distance
D. Power–time
✅ Answer: A
📘 Explanation: Power = Force × Velocity = constant → inverse relation.
12. A capacitor stores energy in the form of:
A. Electric current
B. Magnetic field
C. Electric field
D. Heat
✅ Answer: C
📘 Explanation: Energy stored in electric field between plates.
13. In an AC circuit, if frequency increases, inductive reactance:
A. Decreases
B. Increases
C. Becomes zero
D. Remains constant
✅ Answer: B
📘 Explanation: XL = 2πfL.
14. The radius of gyration is minimum when mass is:
A. At axis
B. At maximum distance
C. Uniformly distributed
D. Concentrated near axis
✅ Answer: D
📘 Explanation: Less distance from axis → smaller radius of gyration.
15. The speed of light in a medium depends on:
A. Frequency
B. Wavelength
C. Refractive index
D. Intensity
✅ Answer: C
📘 Explanation: v = c/n.
16. A transformer is most efficient when losses are:
A. Maximum
B. Minimum
C. Zero
D. Independent of load
✅ Answer: B
📘 Explanation: Lower losses → higher efficiency.
17. Which quantity is conserved in all types of collisions?
A. Kinetic energy
B. Mechanical energy
C. Momentum
D. Potential energy
✅ Answer: C
📘 Explanation: Momentum is always conserved.
18. The boiling point of a liquid decreases when:
A. Pressure increases
B. Pressure decreases
C. Temperature increases
D. Density increases
✅ Answer: B
📘 Explanation: Lower pressure → lower boiling point.
19. Which optical instrument uses total internal reflection?
A. Microscope
B. Telescope
C. Periscope
D. Optical fibre
✅ Answer: D
📘 Explanation: Optical fibres work on total internal reflection.
20. The unit of self-inductance is:
A. Tesla
B. Weber
C. Henry
D. Farad
✅ Answer: C
📘 Explanation: Inductance is measured in Henry (H).
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