Physics MCQs – Units, Motion & Newton’s Laws

1. The SI unit of length is:

A) Centimetre
B) Metre
C) Kilometre
D) Foot

✅ Answer: B) Metre

2. The SI unit of mass is:

A) Gram
B) Kilogram
C) Pound
D) Quintal

✅ Answer: B) Kilogram

3. Which of the following is NOT an SI base unit?

A) Metre
B) Second
C) Newton
D) Mole

✅ Answer: C) Newton

4. The SI unit of electric current is:

A) Volt
B) Watt
C) Ampere
D) Coulomb

✅ Answer: C) Ampere

5. The SI unit of temperature is:

A) Celsius
B) Fahrenheit
C) Kelvin
D) Rankine

✅ Answer: C) Kelvin

6. The SI unit of luminous intensity is:

A) Candela
B) Lumen
C) Lux
D) Watt

✅ Answer: A) Candela

7. The SI unit of amount of substance is:

A) Gram
B) Mole
C) Kilogram
D) Atom

✅ Answer: B) Mole

8. Plane angle is measured in:

A) Steradian
B) Degree
C) Radian
D) Minute

✅ Answer: C) Radian

9. Solid angle is measured in:

A) Degree
B) Steradian
C) Radian
D) Arc

✅ Answer: B) Steradian

10. Which of the following is a scalar quantity?

A) Velocity
B) Displacement
C) Force
D) Mass

✅ Answer: D) Mass

11. Which one is a vector quantity?

A) Speed
B) Distance
C) Velocity
D) Volume

✅ Answer: C) Velocity

12. Which quantity has magnitude only?

A) Vector
B) Scalar
C) Force
D) Momentum

✅ Answer: B) Scalar

13. Distance is always:

A) Positive
B) Negative
C) Zero
D) Positive or Negative

✅ Answer: A) Positive

14. Displacement can be:

A) Positive only
B) Negative only
C) Positive, Negative or Zero
D) Never Zero

✅ Answer: C) Positive, Negative or Zero

15. Distance is a:

A) Vector
B) Scalar
C) Tensor
D) None

✅ Answer: B) Scalar

16. SI unit of speed is:

A) km/hr
B) m/s
C) cm/s
D) m/hr

✅ Answer: B) m/s

17. Speed is defined as:

A) Distance × Time
B) Distance / Time
C) Time / Distance
D) Velocity × Time

✅ Answer: B) Distance / Time

18. Velocity is:

A) Distance/Time
B) Displacement/Time
C) Mass/Time
D) Force/Area

✅ Answer: B) Displacement/Time

19. Average speed is:

A) Total displacement / Total time
B) Total distance / Total time
C) Velocity × Time
D) Distance × Time

✅ Answer: B) Total distance / Total time

20. SI unit of acceleration is:

A) m/s
B) m/s²
C) km/hr²
D) cm/s

✅ Answer: B) m/s²

21. Acceleration is:

A) Rate of change of force
B) Rate of change of velocity
C) Rate of change of distance
D) Rate of change of momentum

✅ Answer: B) Rate of change of velocity

22. Negative acceleration is called:

A) Momentum
B) Retardation
C) Inertia
D) Force

✅ Answer: B) Retardation

23. If the position of an object changes with time, it is said to be:

A) At Rest
B) In Motion
C) Balanced
D) Static

✅ Answer: B) In Motion

24. Projectile motion follows:

A) Straight Line
B) Circle
C) Ellipse
D) Parabola

✅ Answer: D) Parabola

25. Maximum range of a projectile is obtained at:

A) 30°
B) 45°
C) 60°
D) 90°

✅ Answer: B) 45°

26. Two bodies dropped from the same height reach the ground:

A) At different times
B) Same time
C) Depends on mass
D) Depends on shape

✅ Answer: B) Same time

27. A freely falling body moves due to:

A) Magnetism
B) Gravity
C) Electricity
D) Pressure

✅ Answer: B) Gravity

28. Motion along a circular path is called:

A) Projectile Motion
B) Circular Motion
C) Oscillatory Motion
D) Rectilinear Motion

✅ Answer: B) Circular Motion

29. Uniform circular motion has:

A) Zero acceleration
B) Constant acceleration
C) Variable speed
D) No velocity

✅ Answer: B) Constant acceleration (centripetal acceleration)

30. Angular velocity is:

A) Angular displacement / Time
B) Distance / Time
C) Velocity / Time
D) Force / Time

✅ Answer: A) Angular displacement / Time

31. Newton’s First Law is also called:

A) Law of Gravitation
B) Law of Inertia
C) Law of Acceleration
D) Law of Momentum

✅ Answer: B) Law of Inertia

32. Inertia is the property by which a body:

A) Changes motion
B) Opposes change in motion
C) Stops automatically
D) Accelerates itself

✅ Answer: B) Opposes change in motion

33. Passengers bend backward when a bus starts suddenly due to:

A) Gravity
B) Friction
C) Inertia
D) Pressure

✅ Answer: C) Inertia

34. Dust particles are removed by beating a carpet because of:

A) Gravity
B) Inertia
C) Force
D) Pressure

✅ Answer: B) Inertia

35. Force is equal to:

A) m × v
B) m × a
C) v/t
D) Distance × Time

✅ Answer: B) m × a

36. SI unit of force is:

A) Joule
B) Newton
C) Pascal
D) Watt

✅ Answer: B) Newton

37. Newton’s Second Law gives the:

A) Definition of inertia
B) Magnitude of force
C) Definition of velocity
D) Definition of speed

✅ Answer: B) Magnitude of force

38. Newton’s Third Law states:

A) F = ma
B) Every action has an equal and opposite reaction
C) Bodies remain at rest
D) Momentum is conserved

✅ Answer: B) Every action has an equal and opposite reaction

39. Action and reaction act:

A) On the same body
B) On different bodies
C) In the same direction
D) At different times

✅ Answer: B) On different bodies

40. Which prefix represents 10³?

A) Mega
B) Kilo
C) Giga
D) Milli

✅ Answer: B) Kilo

41. Mega means:

A) 10⁹
B) 10⁶
C) 10³
D) 10¹²

✅ Answer: B) 10⁶

42. Milli means:

A) 10⁻²
B) 10⁻³
C) 10⁻⁶
D) 10⁻⁹

✅ Answer: B) 10⁻³

43. Micro (μ) represents:

A) 10⁻³
B) 10⁻⁶
C) 10⁻⁹
D) 10⁻¹²

✅ Answer: B) 10⁻⁶

44. Nano represents:

A) 10⁻⁶
B) 10⁻⁹
C) 10⁻¹²
D) 10⁻³

✅ Answer: B) 10⁻⁹

45. Giga means:

A) 10⁶
B) 10⁹
C) 10¹²
D) 10³

✅ Answer: B) 10⁹

46. Tera means:

A) 10⁶
B) 10⁹
C) 10¹²
D) 10¹⁵

✅ Answer: C) 10¹²

47. Which quantity is always positive?

A) Displacement
B) Velocity
C) Distance
D) Acceleration

✅ Answer: C) Distance

48. Velocity is a:

A) Scalar
B) Vector
C) Tensor
D) Constant

✅ Answer: B) Vector

49. Speed is a:

A) Vector
B) Scalar
C) Tensor
D) None

✅ Answer: B) Scalar

50. Which law defines force?

A) Newton’s First Law
B) Newton’s Second Law
C) Newton’s Third Law
D) Universal Gravitation

✅ Answer: A) Newton’s First Law

Important One-Liner Revision

✅ SI Unit of Force → Newton (N)
✅ SI Unit of Speed → m/s
✅ SI Unit of Acceleration → m/s²
✅ SI Unit of Velocity → m/s
✅ SI Unit of Mass → kg
✅ SI Unit of Length → m
✅ SI Unit of Time → s
✅ SI Unit of Temperature → K
✅ Scalar Examples → Mass, Speed, Distance, Volume
✅ Vector Examples → Velocity, Displacement, Force, Acceleration
✅ Maximum Projectile Range → 45°
✅ Projectile Path → Parabola
✅ Force Formula → F = ma
✅ Newton’s 1st Law → Law of Inertia
✅ Newton’s 2nd Law → Rate of change of momentum
✅ Newton’s 3rd Law → Every action has an equal and opposite reaction
✅ Kilo = 10³
✅ Mega = 10⁶
✅ Giga = 10⁹
✅ Tera = 10¹²
✅ Milli = 10⁻³
✅ Micro = 10⁻⁶
✅ Nano = 10⁻⁹

Post Views: 2

Physics MCQs – Units, Motion & Newton’s Laws

1. The SI unit of length is:

2. The SI unit of mass is:

3. Which of the following is NOT an SI base unit?

4. The SI unit of electric current is:

5. The SI unit of temperature is:

6. The SI unit of luminous intensity is:

7. The SI unit of amount of substance is:

8. Plane angle is measured in:

9. Solid angle is measured in:

10. Which of the following is a scalar quantity?

11. Which one is a vector quantity?

12. Which quantity has magnitude only?

13. Distance is always:

14. Displacement can be:

15. Distance is a:

16. SI unit of speed is:

17. Speed is defined as:

18. Velocity is:

19. Average speed is:

20. SI unit of acceleration is:

21. Acceleration is:

22. Negative acceleration is called:

23. If the position of an object changes with time, it is said to be:

24. Projectile motion follows:

25. Maximum range of a projectile is obtained at:

26. Two bodies dropped from the same height reach the ground:

27. A freely falling body moves due to:

28. Motion along a circular path is called:

29. Uniform circular motion has:

30. Angular velocity is:

31. Newton’s First Law is also called:

32. Inertia is the property by which a body:

33. Passengers bend backward when a bus starts suddenly due to:

34. Dust particles are removed by beating a carpet because of:

35. Force is equal to:

36. SI unit of force is:

37. Newton’s Second Law gives the:

38. Newton’s Third Law states:

39. Action and reaction act:

40. Which prefix represents 10³?

41. Mega means:

42. Milli means:

43. Micro (μ) represents:

44. Nano represents:

45. Giga means:

46. Tera means:

47. Which quantity is always positive?

48. Velocity is a:

49. Speed is a:

50. Which law defines force?

Important One-Liner Revision

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