Science MCQs (Physics):
Physics MCQs – Set 7
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Science MCQs (Physics) – Set 7
Level: Numerical-Heavy + Concept-Trap (Very High Level)
Perfect for SSC CGL, Railway JE, HP SET, NDA, State PCS
Physics MCQs – Set 7 (20 Questions with Explanation)
1. A car starts from rest and attains a speed of 20 m/s in 10 s. Its acceleration is:
A. 1 m/s²
B. 2 m/s²
C. 4 m/s²
D. 0.5 m/s²
✅ Answer: B
📘 Explanation:
a = (v − u)/t = (20 − 0)/10 = 2 m/s²
2. A body of mass 2 kg moves with velocity 5 m/s. Its kinetic energy is:
A. 10 J
B. 25 J
C. 50 J
D. 100 J
✅ Answer: C
📘 Explanation:
KE = ½mv² = ½ × 2 × 25 = 25 J ❌ (check)
Correct calculation: ½×2×(5)² = 25 J
➡️ Correct Answer: B. 25 J
3. A force of 10 N acts on a body of mass 2 kg. Acceleration produced is:
A. 2 m/s²
B. 5 m/s²
C. 10 m/s²
D. 20 m/s²
✅ Answer: B
📘 Explanation:
a = F/m = 10/2 = 5 m/s²
4. If a wave has frequency 100 Hz and wavelength 2 m, its speed is:
A. 50 m/s
B. 100 m/s
C. 200 m/s
D. 500 m/s
✅ Answer: C
📘 Explanation:
v = fλ = 100 × 2 = 200 m/s
5. A body thrown upward with velocity 20 m/s. Time taken to reach maximum height (g = 10 m/s²):
A. 1 s
B. 2 s
C. 3 s
D. 4 s
✅ Answer: B
📘 Explanation:
t = u/g = 20/10 = 2 s
6. A resistor of 10 Ω is connected to a 5 V battery. Current flowing is:
A. 0.2 A
B. 0.5 A
C. 1 A
D. 2 A
✅ Answer: A
📘 Explanation:
I = V/R = 5/10 = 0.5 A ❌
➡️ Correct Answer: B. 0.5 A
7. The work done when a force of 5 N moves a body by 4 m in the direction of force is:
A. 9 J
B. 20 J
C. 25 J
D. 40 J
✅ Answer: B
📘 Explanation:
Work = F × s = 5 × 4 = 20 J
8. Power of a machine doing 200 J work in 10 s is:
A. 10 W
B. 15 W
C. 20 W
D. 25 W
✅ Answer: C
📘 Explanation:
Power = Work/Time = 200/10 = 20 W
9. A stone tied to a string is rotated in a circular path. The force acting is:
A. Gravitational
B. Centrifugal
C. Centripetal
D. Magnetic
✅ Answer: C
📘 Explanation:
Centripetal force keeps the stone in circular motion.
10. If resistance of a wire is doubled, the current becomes:
(Voltage constant)
A. Double
B. Half
C. Four times
D. Zero
✅ Answer: B
📘 Explanation:
I = V/R → doubling R halves current.
11. A body covers equal distances in equal intervals of time. Motion is:
A. Accelerated
B. Uniform
C. Retarded
D. Circular
✅ Answer: B
📘 Explanation:
Equal distances in equal time → uniform motion.
12. The potential energy of a body of mass 2 kg at height 5 m (g = 10 m/s²) is:
A. 50 J
B. 100 J
C. 150 J
D. 200 J
✅ Answer: B
📘 Explanation:
PE = mgh = 2 × 10 × 5 = 100 J
13. Frequency of AC in India is:
A. 25 Hz
B. 40 Hz
C. 50 Hz
D. 60 Hz
✅ Answer: C
📘 Explanation:
Standard AC frequency in India is 50 Hz.
14. The device used to increase AC voltage is:
A. Generator
B. Motor
C. Transformer
D. Rectifier
✅ Answer: C
📘 Explanation:
A step-up transformer increases voltage.
15. The unit of momentum is:
A. kg m/s
B. N/m
C. J/s
D. kg/m²
✅ Answer: A
📘 Explanation:
Momentum = mass × velocity.
16. The colour of light with highest frequency is:
A. Red
B. Green
C. Blue
D. Violet
✅ Answer: D
📘 Explanation:
Violet has the highest frequency.
17. The SI unit of magnetic flux is:
A. Tesla
B. Weber
C. Henry
D. Gauss
✅ Answer: B
📘 Explanation:
Magnetic flux is measured in Weber.
18. Which mirror always forms a virtual image?
A. Concave
B. Convex
C. Plane
D. Both B and C
✅ Answer: D
📘 Explanation:
Plane and convex mirrors form virtual images.
19. A transformer works on:
A. Electrostatic induction
B. Electromagnetic induction
C. Chemical reaction
D. Thermal effect
✅ Answer: B
📘 Explanation:
Transformer works on electromagnetic induction.
20. Sound waves in air are:
A. Transverse
B. Longitudinal
C. Electromagnetic
D. Stationary
✅ Answer: B
📘 Explanation:
Sound waves in air are longitudinal.
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