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Class 9 Science Chapter 9 Force And Laws Of Motion Quiz 2 (60 MCQs)

Quiz Instructions

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1. A force must be physically touching an object in order to act on it.
2. When a sailor jumps in the forward direction from a small boat the boat moves backwards. Here reaction force is
3. Keeping applied force constant, if you increase the mass on an object, its acceleration
4. What factors does the inertia of body depends?
5. What is the total momentum of the bullet and the gun before firing?
6. Assertion (A)-When we keep an object on a table, the object exerts a force downwards and the table needs to exert an equal force upwards Reason (R)-For every action there is equal and opposite reaction.
7. The forces are said to be balanced, if net force is .....
8. An object of mass 2 kg is sliding with a constant velocity of 4 m s$^{-1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
9. Can momentum be lost or destroyed?
10. Forces that are equal in size but in opposite directions are called ..... forces.
11. According to the third law of motion, action and reaction.
12. A student pushes a box to right with a force of 10N while a young boy pushes the box to the left with a force of 8N. What is the sum of all forces on the box?
13. An object of mass 100kg is accelerated uniformly from a velocity of 4 m/s to 8 m/s in 2 seconds. Calculate the initial and final momentum of the object
14. One newton is equal to
15. What law is best described by inertia?
16. Which type of force is used when you open a door?
17. According to Newton's Laws, for every action there is an .....
18. What is Newton's First Law?
19. A water tanker filled up to 2/3 of its height is moving with a uniform speed. On a sudden application of brakes, the water in the tank would
20. How much force acts on a body whose momentum is constant?
21. Which of the following is not an illustration of Newton's third law?
22. Which of these is evidence that an unbalanced force is acting on an object?
23. A baseball is thrown a distance of 50 meters. What is the speed if it takes 2 seconds to cover that distance?
24. If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration?
25. If a 10 kilogram object accelerates suddenly at 15 m/s$^{2}$, how much force was applied to the object?
26. Inertia can be of
27. A train passes over a 400 m long bridge. If the speed of the train is 30 m/s and the train takes 20 s to cross the bridge, then tell me the length of the train (your gift for correctly answering this question is a chocolate).
28. 20 N is the .....
29. A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is .....
30. Which force produces a change in motion?
31. An object continues to stay in motion unless ..... is applied.
32. When a cannon fires a cannonball we observe Newton's third law. Which force is the reaction force?
33. When a bird flies, its wings push air downward. As a result the air pushes back upward on the bird. Which law of motion most applies to the way the wings of a bird beat?
34. A mass is doubled and the net force is kept constant. The acceleration of the body .....
35. The tendency of a body to continue in its state of rest or of uniform motion, even on the application of external force is known as
36. Recoiling of gun is an example of ..... law of motion.
37. During a collision ..... is always constant
38. Newton's second law states .....
39. ASSERTION(A)-The wings of a bird push air downwards and the air must be pushing the birds upwards.Reason(R)-For every action there is an equal reaction in the same direction
40. A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.
41. Motion's first equation is.
42. The tendency of an object to resist a change in its motion
43. A bullet of mass 10 gm is fired with an initial velocity of 20 m/s from a rifle of mass 4 kg. Calculate the initial recoil velocity of the rifle?
44. What can a force do?
45. A man is standing on a boat in still water. If he walks towards the shore, then the boat will AWAY FROM SHPORE it is example of
46. A truck and a car moving with the same velocity collide with a wall. Which of the following statements is true?
47. A particle of mass 0.2 kg is kept at rest.A force of 2 N acts on it for 2 second.Find the distance moved by the particle in (i) these 2 second and (ii) next 2 seconds if the same force is continued to be applied.
48. In a rocket, a large volume of gases produced by the combustion of fuel is allowed to escape through its tail nozzle in the downward direction with the tremendous speed and makes the rocket to move upward.Which principle is followed in this take off of the rocket?
49. Two astronauts are playing catch in space. The first astronaut throws the ball; and
50. How much net force is required to accelerate a 1000 kg car at 4.00 m/s$^{2}$?
51. A fielder pulls his hands backwards after catching the cricket ball. This enables the fielder to:
52. Two equal forces acting in opposite directions on an object
53. The first law of motion is also known as
54. Friction and gravity are both examples of a force.
55. A gun mass 6kg and bullet mass 4g and bullet moving with 8m/s find recoil velocity of gun
56. External forces are
57. A force of 100 N acts on a ball moving on a surface. The force of friction that must act between the surface of the ball and the surface so that the ball keeps on moving with constant velocity over the surface must be
58. Find the momentum of a 3.0 kg mass when it is stopped.
59. What is the formula for force?
60. An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a friction less horizontal table. The force required to keep the object moving with the same velocity is
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