Science MCQs (Physics):
Physics MCQs – Set 10
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Science MCQs (Physics) – Set 10
Level: Mixed Ultra-Hard (Numerical + Conceptual + Trap)
Useful for SSC CGL, Railway JE, HP SET, NDA, State PCS
Physics MCQs – Set 10 (20 Questions with Explanation)
1. A body moves with constant speed but changing velocity. The motion is:
A. Uniform linear
B. Uniform circular
C. Accelerated linear
D. Random
✅ Answer: B
📘 Explanation: In circular motion, speed is constant but velocity changes due to direction change.
2. The area under a force–distance graph represents:
A. Power
B. Energy
C. Work
D. Momentum
✅ Answer: C
📘 Explanation: Work = ∫F·dx → area under F–x graph.
3. If the momentum of a body is doubled, its kinetic energy becomes:
A. Double
B. Half
C. Four times
D. Remains same
✅ Answer: C
📘 Explanation:
KE = p²/2m → KE ∝ p².
4. The unit of angular momentum is:
A. kg m/s
B. N m
C. kg m²/s
D. J s
✅ Answer: C
📘 Explanation: Angular momentum = r × p.
5. A wire of resistance R is melted and recast to half its length. New resistance is:
A. R/2
B. R
C. 2R
D. 4R
✅ Answer: D
📘 Explanation:
When length halves, area doubles → R ∝ L/A → R/4? ❌
Correct: L → L/2, A → 2A
R' = (ρL/2)/(2A) = R/4
➡️ Correct Answer: A. R/4
6. The coefficient of friction depends on:
A. Area of contact
B. Nature of surfaces
C. Shape of body
D. Weight of body
✅ Answer: B
📘 Explanation: Friction depends on surface nature, not area.
7. Which quantity is conserved when no external force acts on a system?
A. Kinetic energy
B. Mechanical energy
C. Momentum
D. Potential energy
✅ Answer: C
📘 Explanation: Law of conservation of momentum.
8. In Young’s double slit experiment, if wavelength is doubled, fringe width becomes:
A. Half
B. Same
C. Double
D. Four times
✅ Answer: C
📘 Explanation: Fringe width ∝ wavelength.
9. A convex lens forms a virtual image when the object is placed:
A. Beyond 2F
B. At F
C. Between F and 2F
D. Between lens and F
✅ Answer: D
📘 Explanation: Convex lens gives virtual image only when object is within focal length.
10. The magnetic field inside a current-carrying solenoid is:
A. Zero
B. Non-uniform
C. Uniform
D. Circular
✅ Answer: C
📘 Explanation: Inside a long solenoid, magnetic field is uniform.
11. Which quantity has the same unit as torque?
A. Work
B. Power
C. Energy
D. Momentum
✅ Answer: A
📘 Explanation: Torque and work both have unit N·m (different nature).
12. A gas expands freely in vacuum. The change in its temperature is:
A. Increase
B. Decrease
C. Zero
D. Infinite
✅ Answer: C
📘 Explanation: Free expansion → no work, no heat exchange → temperature constant (ideal gas).
13. The power loss in a transmission line is minimum when:
A. Current is high
B. Voltage is low
C. Voltage is high
D. Resistance is high
✅ Answer: C
📘 Explanation: Power loss = I²R → high voltage means low current.
14. The refractive index of a medium is maximum for:
A. Red light
B. Yellow light
C. Blue light
D. Violet light
✅ Answer: D
📘 Explanation: Higher frequency → higher refractive index.
15. The work done in stretching a spring depends on:
A. Extension only
B. Force only
C. Spring constant and extension
D. Mass attached
✅ Answer: C
📘 Explanation: Work = ½kx².
16. Which electromagnetic wave is used in night vision devices?
A. Ultraviolet
B. Infrared
C. X-rays
D. Microwaves
✅ Answer: B
📘 Explanation: Night vision uses infrared radiation.
17. A satellite appears stationary with respect to Earth when its orbit is:
A. Polar
B. Elliptical
C. Geostationary
D. Low Earth
✅ Answer: C
📘 Explanation: Geostationary satellites match Earth’s rotation.
18. The dimensional formula of surface tension is:
A. [MT⁻²]
B. [MLT⁻²]
C. [MT⁻²L⁻¹]
D. [ML²T⁻²]
✅ Answer: A
📘 Explanation: Surface tension = force/length.
19. The quality of sound depends on:
A. Frequency
B. Amplitude
C. Waveform
D. Velocity
✅ Answer: C
📘 Explanation: Quality (timbre) depends on waveform.
20. The phenomenon used in optical fibre communication is:
A. Refraction
B. Dispersion
C. Diffraction
D. Total internal reflection
✅ Answer: D
📘 Explanation: Light is guided by total internal reflection.
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