RRB Assistant Loco Pilot - Mechanics: motion, force, work and energy One Line Questions & Answers

1. The formula for gravitational potential energy near the Earth's surface is: — mgh

2. A machine does 1000 J of work in 5 seconds. Its power is: — 200 W

3. If a force of 10 N acts on a body and displaces it by 5 m in the direction of the force, the work done is: — 50 J

4. If work is done in 10 seconds and power is 50 W, the work done is: — 500 J

5. Momentum is the product of mass and: — Velocity

6. In uniform circular motion, the acceleration is directed: — Towards the center

7. Centripetal force is a force that acts: — Towards the center of circular motion

8. The principle of conservation of energy states that energy: — Can neither be created nor destroyed

9. The force required to keep an object moving in a circular path is called: — Centripetal force

10. Acceleration is the rate of change of: — Velocity

11. Which law relates force, mass, and acceleration? — Second Law

12. The change in momentum of an object is equal to the: — Impulse

13. Which of the following is a non-contact force? — Gravitational force

14. If the speed of a body doubles, its kinetic energy becomes: — Four times

15. If mass is kept constant, doubling the acceleration will: — Double the force

16. When a ball is thrown upwards, its potential energy increases as it goes higher, while its kinetic energy: — Decreases

17. When a conservative force does positive work, the potential energy of the system: — Decreases

18. Newton's third law of motion states that for every action, there is an equal and: — Opposite reaction

19. What is the SI unit of force? — Newton

20. What is the SI unit of power? — Watt

21. Which of the following is a unit of power? — Joule/second

22. What is the SI unit of distance? — Meter

23. Impulse is equal to the change in: — Momentum

24. Which quantity is conserved in an isolated system according to the law of conservation of momentum? — Momentum

25. What is the SI unit of acceleration? — m/s^2

26. Which of the following is a vector quantity? — Velocity

27. The formula for kinetic energy is: — 1/2 mv^2

28. Newton's first law of motion is also known as the law of: — Inertia

29. What is the term for the tendency of an object to resist changes in its state of motion? — Inertia

30. Potential energy is the energy possessed by a body due to its: — Position or Configuration

31. Friction is a force that opposes: — Motion

32. What is the SI unit of work? — Joule

33. What is the unit of impulse? — Newton-second

34. What is the SI unit of momentum? — Kilogram-meter per second

35. A body at rest will remain at rest unless acted upon by an external force. This is: — Newton's First Law

36. Kinetic energy is the energy possessed by a body due to its: — Motion

37. The work done by a force perpendicular to the displacement is: — Zero

38. The work done by the centripetal force on an object in uniform circular motion is: — Zero

39. Which type of friction is generally the strongest? — Static friction

40. Which quantity represents the rate of change of velocity? — Acceleration

41. Which of the following is a scalar quantity? — Speed

42. Force is defined as the product of mass and: — Acceleration

43. Work done is defined as the product of force and: — Displacement in the direction of force

44. What is the SI unit of energy? — Joule

45. Power is the rate of doing: — Work

46. If a force is applied for a very short duration, the product of force and time is called: — Impulse

47. The product of force and velocity is related to: — Power

48. A body is in equilibrium if the net force acting on it is: — Zero

49. A body moving with constant velocity has a net force of: — Zero

Mechanics: motion, force, work and energy - One Line Questions