Science MCQs (Physics):
Physics MCQs – Set 1
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Science MCQs (Physics) with answers and clear explanations. These are useful for SSC, Railway, State exams, HP SET, TET, and other competitive exams.
Physics MCQs – Set 1 (20 Questions with Explanation)
1. What is the SI unit of force?
A. Joule
B. Pascal
C. Newton
D. Watt
✅ Answer: C. Newton
📘 Explanation: Force = mass × acceleration. Its SI unit is Newton (N).
2. Which law explains action and reaction?
A. First law of motion
B. Second law of motion
C. Third law of motion
D. Law of gravitation
✅ Answer: C. Third law of motion
📘 Explanation: Newton’s third law states: For every action, there is an equal and opposite reaction.
3. What is the speed of light in vacuum?
A. 3 × 10⁶ m/s
B. 3 × 10⁸ m/s
C. 3 × 10⁵ m/s
D. 3 × 10⁴ m/s
✅ Answer: B. 3 × 10⁸ m/s
📘 Explanation: Light travels fastest in vacuum at 3 × 10⁸ m/s.
4. Which instrument is used to measure electric current?
A. Voltmeter
B. Ammeter
C. Galvanometer
D. Ohmmeter
✅ Answer: B. Ammeter
📘 Explanation: An ammeter measures electric current in amperes.
5. What is the unit of electric resistance?
A. Ampere
B. Volt
C. Ohm
D. Watt
✅ Answer: C. Ohm
📘 Explanation: Resistance is measured in Ohms (Ω).
6. Sound cannot travel through:
A. Air
B. Water
C. Vacuum
D. Solid
✅ Answer: C. Vacuum
📘 Explanation: Sound needs a medium; it cannot travel in vacuum.
7. Which mirror is used as a rear-view mirror?
A. Concave mirror
B. Plane mirror
C. Convex mirror
D. Cylindrical mirror
✅ Answer: C. Convex mirror
📘 Explanation: Convex mirrors provide a wider field of view.
8. What is the unit of frequency?
A. Joule
B. Hertz
C. Watt
D. Newton
✅ Answer: B. Hertz
📘 Explanation: Frequency is measured in Hertz (Hz).
9. Which colour has the highest wavelength?
A. Violet
B. Blue
C. Green
D. Red
✅ Answer: D. Red
📘 Explanation: Red light has the longest wavelength.
10. What type of energy is stored in a stretched spring?
A. Kinetic energy
B. Heat energy
C. Potential energy
D. Electrical energy
✅ Answer: C. Potential energy
📘 Explanation: A stretched or compressed spring stores potential energy.
11. Which device converts electrical energy into mechanical energy?
A. Generator
B. Electric motor
C. Battery
D. Transformer
✅ Answer: B. Electric motor
📘 Explanation: An electric motor converts electrical energy into mechanical energy.
12. What is the unit of power?
A. Joule
B. Volt
C. Ampere
D. Watt
✅ Answer: D. Watt
📘 Explanation: Power = work/time, measured in Watt (W).
13. Which phenomenon explains the bending of light?
A. Reflection
B. Refraction
C. Diffusion
D. Dispersion
✅ Answer: B. Refraction
📘 Explanation: Bending of light when it changes medium is called refraction.
14. The rate of change of velocity is called:
A. Speed
B. Momentum
C. Acceleration
D. Force
✅ Answer: C. Acceleration
📘 Explanation: Acceleration = change in velocity / time.
15. Which gas is filled in electric bulbs?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Carbon dioxide
✅ Answer: B. Nitrogen
📘 Explanation: Nitrogen or inert gases are used to increase bulb life.
16. What is the SI unit of pressure?
A. Newton
B. Pascal
C. Joule
D. Bar
✅ Answer: B. Pascal
📘 Explanation: Pressure = force/area, SI unit is Pascal (Pa).
17. Which metal is the best conductor of electricity?
A. Copper
B. Aluminium
C. Iron
D. Silver
✅ Answer: D. Silver
📘 Explanation: Silver has the lowest resistance, hence best conductor.
18. What type of lens is used in a microscope?
A. Concave lens
B. Convex lens
C. Plane lens
D. Cylindrical lens
✅ Answer: B. Convex lens
📘 Explanation: A convex lens magnifies small objects.
19. Which law relates voltage, current, and resistance?
A. Newton’s law
B. Ohm’s law
C. Faraday’s law
D. Coulomb’s law
✅ Answer: B. Ohm’s law
📘 Explanation: Ohm’s law: V = IR.
20. What causes tides in the oceans?
A. Wind
B. Earth’s rotation
C. Moon’s gravity
D. Sun’s heat
✅ Answer: C. Moon’s gravity
📘 Explanation: Tides are mainly caused by the gravitational pull of the Moon.
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