Science MCQs (Physics):
Physics MCQs – Set 3
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Science MCQs (Physics) – Set 3
Level: Hard / Competitive (Numerical + Conceptual)
Useful for SSC, Railway, HP SET, TET, Police, NDA
Physics MCQs – Set 3 (20 Questions with Explanation)
1. A body moves with constant speed in a circular path. What is the nature of acceleration?
A. Zero
B. Constant in magnitude but changing in direction
C. Constant in direction but changing in magnitude
D. Zero at every point
✅ Answer: B
📘 Explanation: In circular motion, centripetal acceleration has constant magnitude but direction changes continuously.
2. If the velocity of an object is doubled, its kinetic energy becomes:
A. Double
B. Half
C. Four times
D. Eight times
✅ Answer: C
📘 Explanation: Kinetic energy ∝ v², so doubling velocity makes KE four times.
3. Which of the following is a scalar quantity?
A. Velocity
B. Acceleration
C. Force
D. Speed
✅ Answer: D
📘 Explanation: Speed has magnitude only; others are vectors.
4. The dimensional formula of pressure is:
A. [MLT⁻²]
B. [ML⁻¹T⁻²]
C. [M⁻¹LT⁻²]
D. [ML²T⁻²]
✅ Answer: B
📘 Explanation: Pressure = Force/Area = [MLT⁻²]/[L²] = [ML⁻¹T⁻²].
5. The time period of a simple pendulum depends on:
A. Mass of bob
B. Amplitude
C. Length of string
D. Shape of bob
✅ Answer: C
📘 Explanation: Time period T = 2π√(l/g).
6. Which phenomenon proves the wave nature of light?
A. Reflection
B. Refraction
C. Interference
D. Photoelectric effect
✅ Answer: C
📘 Explanation: Interference is a wave phenomenon.
7. Unit of electric potential difference is:
A. Joule
B. Coulomb
C. Volt
D. Ampere
✅ Answer: C
📘 Explanation: Potential difference is measured in volts.
8. The power of a lens is measured in:
A. Meter
B. Dioptre
C. Joule
D. Watt
✅ Answer: B
📘 Explanation: Power of lens P = 1/f (in meters), unit = dioptre.
9. Which law gives the direction of induced current?
A. Ohm’s law
B. Fleming’s left-hand rule
C. Fleming’s right-hand rule
D. Lenz’s law
✅ Answer: D
📘 Explanation: Lenz’s law gives direction of induced current.
10. A transformer works on the principle of:
A. Electrostatics
B. Electromagnetic induction
C. Thermal effect
D. Chemical effect
✅ Answer: B
📘 Explanation: Transformers operate on electromagnetic induction.
11. The SI unit of magnetic flux is:
A. Tesla
B. Weber
C. Henry
D. Gauss
✅ Answer: B
📘 Explanation: Magnetic flux is measured in Weber (Wb).
12. What happens to resistance when length of wire is doubled?
A. Becomes half
B. Becomes double
C. Becomes four times
D. Remains same
✅ Answer: B
📘 Explanation: Resistance ∝ length.
13. The frequency of AC supply in India is:
A. 40 Hz
B. 50 Hz
C. 60 Hz
D. 100 Hz
✅ Answer: B
📘 Explanation: Standard AC frequency in India is 50 Hz.
14. Which mirror always forms a virtual, erect image?
A. Plane mirror
B. Concave mirror
C. Convex mirror
D. Both A and C
✅ Answer: D
📘 Explanation: Plane and convex mirrors form virtual, erect images.
15. Sound waves are:
A. Transverse
B. Longitudinal
C. Electromagnetic
D. Stationary
✅ Answer: B
📘 Explanation: Sound waves in air are longitudinal.
16. Escape velocity of Earth depends on:
A. Mass of body
B. Shape of Earth
C. Radius of Earth
D. Mass and radius of Earth
✅ Answer: D
📘 Explanation: Escape velocity depends on Earth’s mass and radius.
17. Which material is used for making permanent magnets?
A. Soft iron
B. Steel
C. Copper
D. Aluminium
✅ Answer: B
📘 Explanation: Steel retains magnetism, used for permanent magnets.
18. The energy of a photon depends on:
A. Amplitude
B. Speed of light
C. Frequency
D. Medium
✅ Answer: C
📘 Explanation: E = hν, depends on frequency.
19. The boiling point of water increases with:
A. Decrease in pressure
B. Increase in pressure
C. Decrease in temperature
D. Constant pressure
✅ Answer: B
📘 Explanation: Higher pressure raises boiling point.
20. Which physical quantity has no unit?
A. Force
B. Pressure
C. Relative density
D. Energy
✅ Answer: C
📘 Explanation: Relative density is a ratio, so unitless.
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