Science MCQs (Physics):
Physics MCQs – Set 2
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Science MCQs (Physics) – Set 2 with 20 questions and clear explanations.
Level: Moderate to Hard (SSC, Railway, State Exams, HP SET, TET)
Physics MCQs – Set 2 (20 Questions with Explanation)
1. The SI unit of work is:
A. Watt
B. Newton
C. Joule
D. Pascal
✅ Answer: C. Joule
📘 Explanation: Work = Force × Distance, unit is Joule (J).
2. Which quantity remains constant in uniform circular motion?
A. Velocity
B. Acceleration
C. Speed
D. Direction
✅ Answer: C. Speed
📘 Explanation: Speed is constant but direction changes continuously.
3. What type of energy does a moving object possess?
A. Potential energy
B. Kinetic energy
C. Heat energy
D. Chemical energy
✅ Answer: B. Kinetic energy
📘 Explanation: Energy due to motion is called kinetic energy.
4. The unit of electric charge is:
A. Ampere
B. Coulomb
C. Volt
D. Ohm
✅ Answer: B. Coulomb
📘 Explanation: Electric charge is measured in Coulomb (C).
5. Which mirror can form a real and inverted image?
A. Plane mirror
B. Convex mirror
C. Concave mirror
D. None
✅ Answer: C. Concave mirror
📘 Explanation: A concave mirror forms real, inverted images.
6. What is the frequency of a wave with time period 0.02 s?
A. 20 Hz
B. 50 Hz
C. 100 Hz
D. 200 Hz
✅ Answer: B. 50 Hz
📘 Explanation: Frequency = 1 / Time period = 1 / 0.02 = 50 Hz.
7. Which law states that current is directly proportional to voltage?
A. Newton’s law
B. Faraday’s law
C. Ohm’s law
D. Coulomb’s law
✅ Answer: C. Ohm’s law
📘 Explanation: Ohm’s law: V ∝ I.
8. The unit of magnetic field is:
A. Tesla
B. Weber
C. Gauss
D. Henry
✅ Answer: A. Tesla
📘 Explanation: Magnetic field strength is measured in Tesla (T).
9. Which colour deviates the most in a prism?
A. Red
B. Green
C. Yellow
D. Violet
✅ Answer: D. Violet
📘 Explanation: Violet has the shortest wavelength, so it deviates the most.
10. What is the main function of a fuse?
A. Increase current
B. Decrease voltage
C. Prevent short circuit
D. Store energy
✅ Answer: C. Prevent short circuit
📘 Explanation: Fuse melts when current exceeds safe limit.
11. Which energy transformation occurs in a solar cell?
A. Electrical → Heat
B. Light → Electrical
C. Chemical → Electrical
D. Heat → Mechanical
✅ Answer: B. Light → Electrical
📘 Explanation: Solar cells convert sunlight into electrical energy.
12. The pressure exerted by a liquid depends on:
A. Shape of container
B. Density of liquid
C. Volume of liquid
D. Colour of liquid
✅ Answer: B. Density of liquid
📘 Explanation: Pressure = ρgh, depends on density and depth.
13. Which instrument measures atmospheric pressure?
A. Manometer
B. Barometer
C. Hygrometer
D. Thermometer
✅ Answer: B. Barometer
📘 Explanation: Atmospheric pressure is measured by a barometer.
14. Which type of lens is used to correct myopia?
A. Convex lens
B. Concave lens
C. Cylindrical lens
D. Plane lens
✅ Answer: B. Concave lens
📘 Explanation: Myopia (near-sightedness) is corrected using concave lens.
15. What happens to resistance when temperature increases in a conductor?
A. Decreases
B. Becomes zero
C. Increases
D. Remains constant
✅ Answer: C. Increases
📘 Explanation: Resistance of conductors increases with temperature.
16. Which wave does not require a medium?
A. Sound wave
B. Water wave
C. Light wave
D. Seismic wave
✅ Answer: C. Light wave
📘 Explanation: Light waves are electromagnetic waves.
17. The unit of momentum is:
A. kg m/s
B. N/m
C. J/s
D. kg/m²
✅ Answer: A. kg m/s
📘 Explanation: Momentum = mass × velocity.
18. Which phenomenon causes rainbow formation?
A. Reflection only
B. Refraction only
C. Dispersion
D. Total internal reflection
✅ Answer: C. Dispersion
📘 Explanation: Sunlight splits into colours due to dispersion.
19. The acceleration due to gravity on Earth is approximately:
A. 8.9 m/s²
B. 9.8 m/s²
C. 10.8 m/s²
D. 7.8 m/s²
✅ Answer: B. 9.8 m/s²
📘 Explanation: Standard gravitational acceleration is 9.8 m/s².
20. Which device increases voltage in AC circuits?
A. Generator
B. Electric motor
C. Transformer
D. Battery
✅ Answer: C. Transformer
📘 Explanation: A step-up transformer increases voltage.
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