MCQs For Class 9 Science

Q1. Which of the following is the SI unit of Force?

Q2. If the resultant of all forces acting on a body is zero, the forces are called:

Q3. The tendency of an undisturbed object to stay at rest or to keep moving with the same velocity is called:

Q4. Inertia of an object depends on its:

Q5. Which of the following has more inertia?

Q6. Newton’s First Law of motion is also known as:

Q7. When a passenger in a moving bus leans forward when the bus stops suddenly, it is due to:

Q8. A passenger in a bus falls backward when the bus starts suddenly. This is due to:

Q9. Momentum is the product of:

Q10. The SI unit of Momentum is:

Q11. The rate of change of momentum of an object is proportional to the:

Q12. Newton’s Second Law of motion gives us a measure of:

Q13. The formula for Force (F) is:

Q14. What is the acceleration produced by a force of 12 N exerted on an object of mass 3 kg?

Q15. Newton’s Third Law of motion states that:

Q16. Action and reaction forces act on:

Q17. A goalkeeper in a game of football pulls his hands backwards after catching the ball. This enables him to:

Q18. The recoil of a gun after firing a bullet is an example of:

Q19. A rocket works on the principle of conservation of:

Q20. When we stop pedalling a bicycle, it slows down because of:

Q21. The mass of a body is 2 kg and its velocity is 10 m/s. Its momentum is:

Q22. An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a frictionless horizontal table. The force required to keep the object moving with the same velocity is:

Q23. Which of the following is a vector quantity?

Q24. If the force acting on a body is doubled and the mass is kept constant, the acceleration will:

Q25. To accelerate an object of mass 2 kg at 5 m/s² and an object of mass 4 kg at 2 m/s², which requires a greater force?

Q26. A fielder pulls his hands back while catching a ball to increase the:

Q27. The law that defines Force is:

Q28. The law that gives the quantitative expression of force is:

Q29. 1 Newton is equal to:

Q30. In a collision between a heavy truck and a small car, the force experienced by the car as compared to the truck is:

Q31. Which of the following illustrates Newton's Third Law?

Q32. When we shake the branch of a tree, leaves fall off. This is an example of:

Q33. Momentum of an object at rest is:

Q34. The total momentum of two objects before collision is ________ the total momentum after collision, provided no external force acts.

Q35. A bullet of mass 20g is fired from a gun of mass 2kg. If the bullet moves forward, the gun:

Q36. Balanced forces can change the ________ of an object.

Q37. Unbalanced forces can change the ________ of an object.

Q38. Why do we fall sideways when a car takes a sharp turn at high speed?

Q39. If the mass of an object is doubled, its inertia:

Q40. The effect of an impulse force depends on:

Q41. A goalkeeper pulls his hands backward while catching a fast-moving ball. This is to:

Q42. While walking, we push the ground:

Q43. The seat belts in cars are provided to prevent injury due to:

Q44. A force of 5 N acts on a body of mass 10 kg. The acceleration is:

Q45. When a carpet is beaten with a stick, dust comes out. This is due to:

Q46. The total momentum of a system remains ________ in the absence of an external force.

Q47. If a body is moving with constant velocity, the net force acting on it is:

Q48. Galileo’s experiments on motion of objects on an inclined plane formed the basis for:

Q49. Action and Reaction forces:

Q50. The SI unit of mass is: