Science MCQs (Physics):
Physics MCQs – Set 8
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Science MCQs (Physics) – Set 8
Level: Ultra-Numerical + Graph/Concept Trap (Top Exam Level)
Best for SSC CGL, Railway JE, HP SET, NDA, State PCS
Physics MCQs – Set 8 (20 Questions with Explanation)
1. A body moves with constant acceleration. The graph between velocity and time will be:
A. Horizontal line
B. Straight line
C. Parabola
D. Hyperbola
✅ Answer: B
📘 Explanation: Constant acceleration gives a straight-line v–t graph.
2. A body of mass 4 kg has momentum 20 kg·m/s. Its velocity is:
A. 2 m/s
B. 4 m/s
C. 5 m/s
D. 10 m/s
✅ Answer: C
📘 Explanation:
v = p/m = 20/4 = 5 m/s
3. If the time period of a wave is 0.01 s, its frequency is:
A. 10 Hz
B. 50 Hz
C. 100 Hz
D. 1000 Hz
✅ Answer: C
📘 Explanation:
f = 1/T = 1/0.01 = 100 Hz
4. A body falls freely from rest. Distance covered in 2nd second is:
(g = 10 m/s²)
A. 5 m
B. 10 m
C. 15 m
D. 20 m
✅ Answer: C
📘 Explanation:
Distance in nth second = g/2 (2n−1)
= 10/2 × 3 = 15 m
5. Which quantity is equal to the area under velocity–time graph?
A. Acceleration
B. Speed
C. Distance
D. Force
✅ Answer: C
📘 Explanation: Area under v–t graph gives distance.
6. Two resistors of 6 Ω and 3 Ω are connected in series. Equivalent resistance is:
A. 2 Ω
B. 3 Ω
C. 6 Ω
D. 9 Ω
✅ Answer: D
📘 Explanation:
Series resistance = 6 + 3 = 9 Ω
7. Power consumed by a device drawing 2 A current at 220 V is:
A. 110 W
B. 220 W
C. 440 W
D. 880 W
✅ Answer: C
📘 Explanation:
P = VI = 220 × 2 = 440 W
8. The unit of impulse is:
A. N
B. N·s
C. J
D. kg·m²/s²
✅ Answer: B
📘 Explanation:
Impulse = Force × Time = change in momentum.
9. Which mirror is used in solar cooker?
A. Plane mirror
B. Convex mirror
C. Concave mirror
D. Cylindrical mirror
✅ Answer: C
📘 Explanation:
Concave mirror concentrates sunlight at focus.
10. A wire is stretched to double its length. New resistance becomes:
A. Half
B. Same
C. Double
D. Four times
✅ Answer: D
📘 Explanation:
R ∝ L² (when volume constant).
11. The pitch of sound depends on:
A. Amplitude
B. Velocity
C. Frequency
D. Wavelength
✅ Answer: C
📘 Explanation:
Higher frequency → higher pitch.
12. Which energy transformation occurs in an electric fan?
A. Electrical → Heat
B. Electrical → Mechanical
C. Mechanical → Electrical
D. Chemical → Mechanical
✅ Answer: B
📘 Explanation:
Electric fan converts electrical energy to mechanical energy.
13. A convex lens has focal length 50 cm. Its power is:
A. +1 D
B. +2 D
C. +0.5 D
D. −2 D
✅ Answer: C
📘 Explanation:
P = 1/f (in m) = 1/0.5 = +2 D ❌
Correct f = 50 cm = 0.5 m → P = +2 D
➡️ Correct Answer: B. +2 D
14. Which law explains buoyancy?
A. Pascal’s law
B. Archimedes’ principle
C. Bernoulli’s theorem
D. Newton’s law
✅ Answer: B
📘 Explanation:
Buoyant force explained by Archimedes’ principle.
15. The escape velocity of Earth is approximately:
A. 7.9 km/s
B. 9.8 km/s
C. 11.2 km/s
D. 15 km/s
✅ Answer: C
📘 Explanation:
Escape velocity ≈ 11.2 km/s.
16. Which device measures electric potential difference?
A. Ammeter
B. Voltmeter
C. Galvanometer
D. Rheostat
✅ Answer: B
📘 Explanation:
Voltmeter measures voltage.
17. The speed of sound increases with:
A. Decrease in temperature
B. Increase in temperature
C. Increase in pressure
D. Decrease in humidity
✅ Answer: B
📘 Explanation:
Sound travels faster at higher temperature.
18. Which electromagnetic wave has the longest wavelength?
A. X-rays
B. Gamma rays
C. Infrared
D. Radio waves
✅ Answer: D
📘 Explanation:
Radio waves have the longest wavelength.
19. The phenomenon of splitting of white light is called:
A. Reflection
B. Refraction
C. Diffraction
D. Dispersion
✅ Answer: D
📘 Explanation:
White light splits due to dispersion.
20. The SI unit of Young’s modulus is:
A. Newton
B. Joule
C. Pascal
D. Watt
✅ Answer: C
📘 Explanation:
Young’s modulus = stress/strain → unit Pascal (Pa).
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