TRB BT Assistant - Newton’s Laws of Motion and Applications Online Test (MCQ Quiz)

1. According to Newton's First Law of Motion, an object in motion will continue in motion with constant velocity unless acted upon by an external force. What is another name for this law?

A) Law of Acceleration B) Law of Inertia C) Law of Action-Reaction D) Law of Momentum

2. Which of Newton's Laws of Motion describes the relationship between force, mass, and acceleration?

A) First Law B) Second Law C) Third Law D) Law of Gravitation

3. Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. Which of the following is an example of this law?

A) A car accelerating forward B) A book resting on a table C) A rocket expelling gas downwards to move upwards D) A ball rolling down a hill

4. What is the mathematical formula that represents Newton's Second Law of Motion?

A) F = m/a B) F = a/m C) F = ma D) F = m + a

5. Inertia is the tendency of an object to resist changes in its state of motion. Which quantity is a measure of inertia?

A) Velocity B) Acceleration C) Momentum D) Mass

6. If you push a box with a force of 10 N and it moves with an acceleration of 2 m/s², what is the mass of the box?

A) 2 kg B) 5 kg C) 10 kg D) 20 kg

7. When a bus suddenly stops, passengers tend to move forward. This is an illustration of:

A) Newton's Second Law B) Newton's Third Law C) Newton's First Law D) The principle of buoyancy

8. What is the unit of force in the SI system?

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

9. If the net force acting on an object is zero, what can be said about its acceleration?

A) It is accelerating at its maximum rate. B) It is accelerating at a constant rate. C) It is not accelerating. D) It is accelerating in the opposite direction of the net force.

10. A person is standing on a skateboard and pushes off a wall. The wall exerts a force on the person and skateboard, causing them to move away from the wall. This is an example of:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Conservation of energy

11. What is the momentum of a 5 kg object moving at a velocity of 10 m/s?

A) 0.5 kg m/s B) 5 kg m/s C) 50 kg m/s D) 500 kg m/s

12. According to Newton's Second Law, if the mass of an object is kept constant, its acceleration is directly proportional to the applied force. What happens to acceleration if the force is doubled?

A) It is halved. B) It remains the same. C) It is doubled. D) It becomes zero.

13. Which of the following scenarios best demonstrates the concept of inertia?

A) A heavy object is harder to push than a light object. B) A moving object slows down due to friction. C) A projectile follows a parabolic path. D) When a car turns sharply, passengers feel pushed outwards.

14. What is the change in momentum of an object when a constant force acts on it for a specific time interval?

A) It is equal to the force. B) It is equal to the product of force and time (Impulse). C) It is equal to the mass times velocity. D) It is equal to the acceleration.

15. When you jump upwards, you push down on the Earth. The Earth pushes back up on you with an equal and opposite force, allowing you to jump. This is an application of:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Conservation of momentum

16. If a force of 20 N is applied to a 4 kg object, what is its acceleration?

A) 0.2 m/s² B) 5 m/s² C) 16 m/s² D) 80 m/s²

17. A balanced force is applied to an object. What is the resulting acceleration?

A) Maximum acceleration B) Constant acceleration C) Zero acceleration D) Negative acceleration

18. What happens to the momentum of a system if no external forces act on it?

A) Momentum increases. B) Momentum decreases. C) Momentum remains constant (conserved). D) Momentum becomes zero.

19. A cannon fires a ball. The cannon recoils backward as the ball moves forward. This is a demonstration of:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Conservation of energy

20. If the mass of an object is doubled while the applied force remains constant, what happens to its acceleration according to Newton's Second Law?

A) Acceleration doubles. B) Acceleration is halved. C) Acceleration remains the same. D) Acceleration becomes zero.

21. Which law explains why it is harder to push a heavy box than a light box across a floor?

A) Newton's First Law (Inertia) B) Newton's Second Law (F=ma) C) Newton's Third Law (Action-Reaction) D) Law of Conservation of Momentum

22. What is the term for the rate of change of momentum of an object?

A) Velocity B) Acceleration C) Force D) Impulse

23. A spacecraft in outer space, far from any gravitational sources, continues to move at a constant velocity even when its engines are off. This is due to:

A) Newton's Second Law B) Newton's Third Law C) Newton's First Law D) The absence of friction

24. Two objects of equal mass are pushed with forces F1 and F2, respectively. If F1 > F2, which object will have a greater acceleration?

A) The object pushed with F1 B) The object pushed with F2 C) Both will have equal acceleration. D) Cannot be determined without knowing the mass.

25. What is the magnitude of the force exerted by the Earth on a 1 kg object at its surface (approximately)?

A) 1 N B) 9.8 N C) 10 N D) 100 N

26. When a bird flies, it pushes air downwards. The air, in turn, pushes the bird upwards. This is an example of:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Aerodynamics

27. A car is moving at a constant speed in a straight line. What can be said about the net force acting on the car?

A) The net force is equal to the engine's driving force. B) The net force is zero. C) The net force is acting in the direction of motion. D) The net force is acting opposite to the direction of motion.

28. What is the impulse experienced by an object if a force of 50 N acts on it for 0.1 seconds?

A) 0.02 Ns B) 0.2 Ns C) 5 Ns D) 50 Ns

29. A sprinter accelerates from rest. Which of Newton's laws is primarily demonstrated when the sprinter pushes backward on the track to move forward?

A) First Law B) Second Law C) Third Law D) Law of Universal Gravitation

30. If a 10 kg object has a momentum of 50 kg m/s, what is its velocity?

A) 0.2 m/s B) 5 m/s C) 50 m/s D) 500 m/s

31. Which of the following situations best illustrates the effect of unbalanced forces?

A) A book lying motionless on a table. B) A car moving at a constant velocity. C) A ball being kicked and changing its direction and speed. D) A satellite in a stable orbit.

32. When a force is applied to an object, it causes a change in its state of motion. This change is described by:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) The principle of superposition

33. What is the SI unit of mass?

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

34. A person sitting in a car experiences a forward jerk when the car starts moving. This is an example of:

A) Newton's Second Law B) Newton's Third Law C) Newton's First Law D) Inertial frame of reference

35. If two forces of equal magnitude but opposite directions act on an object, what is the net force?

A) Equal to one of the forces B) Twice the magnitude of one force C) Zero D) Undetermined

36. What quantity is conserved in collisions when no external forces are present?

A) Kinetic energy B) Momentum C) Potential energy D) Total energy

37. A boat moves forward in water. The boat pushes water backward. This is an application of:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Archimedes' Principle

38. Consider two objects, A and B, where mass of A is greater than mass of B. If the same force is applied to both, which object will experience greater acceleration?

A) Object A B) Object B C) Both will experience equal acceleration D) Cannot be determined

39. What is the force required to accelerate a 100 kg object at 5 m/s²?

A) 20 N B) 50 N C) 500 N D) 200 N

40. A rocket works on the principle of:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Newton's Law of Gravitation

41. If an object is moving with constant velocity, its acceleration is:

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

42. What is the unit of momentum?

A) kg m/s B) N s C) kg m/s² D) N

43. When you walk, you push the ground backward. The ground pushes you forward, enabling you to move. This exemplifies:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Friction

44. If the mass of an object is 10 kg and its velocity changes from 5 m/s to 15 m/s in 2 seconds, what is the average force acting on it?

A) 25 N B) 50 N C) 75 N D) 100 N

45. An object at rest will remain at rest, and an object in motion will continue in motion with constant velocity, unless acted upon by a net external force. This statement is:

A) True, and it's Newton's Second Law. B) True, and it's Newton's First Law. C) False, acceleration is always present. D) True, but it's Newton's Third Law.

46. What is the product of mass and velocity called?

A) Force B) Acceleration C) Momentum D) Impulse

47. A hammer strikes a nail. The hammer exerts a force on the nail, and the nail exerts an equal and opposite force on the hammer. This is an example of:

A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Conservation of energy

48. If the net force on an object is doubled, its acceleration is:

A) Halved B) Doubled C) Tripled D) Unchanged

49. An object's tendency to resist changes in its state of motion is called:

A) Momentum B) Inertia C) Velocity D) Acceleration

50. What is the SI unit of acceleration?

A) m/s B) m/s² C) N D) kg m/s

Newton’s Laws of Motion and Applications - Online Test

Test Results