Looking for authentic SEBA Class 9 Science Chapter 9 (Force and Laws of Motion) MCQ solutions for the 2026–27 academic year? Access complete multiple-choice questions on inertia, Newton’s three laws of motion, momentum, and unit conversions with correct options and clear explanations to score top marks in your exams.
Mcq
1. Force is defined as a:
(a) Push
(b) Pull
(c) Hit
(d) All of these
Answer: (d)
2. Which of the following is NOT an effect of force?
(a) Changes speed
(b) Changes direction
(c) Changes shape
(d) Changes time
Answer: (d)
3. A force can change:
(a) Speed
(b) Direction
(c) Shape
(d) All of these
Answer: (d)
4. If two equal and opposite forces act on an object, the forces are:
(a) Balanced
(b) Unbalanced
(c) Irregular
(d) Variable
Answer: (a)
5. Balanced forces cause:
(a) Motion
(b) No change in motion
(c) Only acceleration
(d) Only deceleration
Answer: (b)
6. Unbalanced force causes:
(a) No effect
(b) Random movement
(c) Change in motion
(d) No acceleration
Answer: (c)
7. When two people pull a rope with unequal force, the rope moves toward:
(a) Weaker person
(b) Stronger person
(c) Middle point
(d) It does not move
Answer: (b)
8. Friction always acts:
(a) In the direction of motion
(b) Opposite to motion
(c) Upwards
(d) Downwards
Answer: (b)
9. A box on the floor moves only when:
(a) Friction > applied force
(b) Applied force > friction
(c) Friction = applied force
(d) No force applied
Answer: (b)
10. A bicycle stops after pedaling stops due to:
(a) Gravity
(b) Air pressure
(c) Friction
(d) Balanced force
Answer: (c)
11. A marble rolling down a slope:
(a) Slows down
(b) Speeds up
(c) Stops immediately
(d) Moves at constant speed
Answer: (b)
12. A marble rolling up a slope:
(a) Speeds up
(b) Slows down
(c) Moves forever
(d) Falls down
Answer: (b)
13. Galileo concluded that a marble on a frictionless horizontal surface would move:
(a) For a short time
(b) For a long time
(c) Forever
(d) In circles
Answer: (c)
14. Real-life objects stop because of:
(a) Inertia
(b) Force
(c) Friction
(d) Momentum
Answer: (c)
15. To reduce friction for a marble, we use:
(a) Rough surface
(b) Sticky surface
(c) Smooth surface
(d) Heavy marble
Answer: (c)
16. Galileo’s experiments proved that:
(a) Force is needed to keep motion
(b) No force is needed to keep uniform motion
(c) Motion always needs energy
(d) Gravity is not a force
Answer: (b)
17. The marble reaches the same height on the other slope because of:
(a) Velocity
(b) Momentum
(c) Inertia
(d) Gravity
Answer: (c)
18. Newton’s First Law is also called:
(a) Law of Friction
(b) Law of Gravity
(c) Law of Inertia
(d) Law of Mass
Answer: (c)
19. Inertia means:
(a) Change of motion
(b) Resistance to change in motion
(c) Increase in speed
(d) Decrease in speed
Answer: (b)
20. A passenger falls forward in a braking bus due to:
(a) Gravity
(b) Inertia of motion
(c) Inertia of rest
(d) Both
Answer: (b)
Class 9 Science Chapter 9 Objective Questions
21. A passenger falls backward when bus starts suddenly due to:
(a) Inertia of rest
(b) Inertia of motion
(c) Friction
(d) Momentum
Answer: (a)
22. Inertia depends on:
(a) Volume
(b) Temperature
(c) Mass
(d) Colour
Answer: (c)
23. More mass means:
(a) Less inertia
(b) More inertia
(c) No inertia
(d) Negative inertia
Answer: (b)
24. A stone is harder to move than a rubber ball because it has:
(a) Less mass
(b) More mass
(c) Low friction
(d) High friction
Answer: (b)
25. A train has high inertia because of its:
(a) Speed
(b) Weight
(c) Mass
(d) Wheels
Answer: (c)
26. Mass is the measure of:
(a) Speed
(b) Force
(c) Momentum
(d) Inertia
Answer: (d)
27. Which has more inertia?
(a) 1-rupee coin
(b) 5-rupee coin
Answer: (b)
28. Which object will continue moving unless stopped by an unbalanced force?
(a) Football on grass
(b) Car on road
(c) Object on frictionless surface
(d) Stone on rough surface
Answer: (c)
29. Momentum is defined as:
(a) Mass × acceleration
(b) Mass × velocity
(c) Force × distance
(d) Velocity × area
Answer: (b)
30. SI unit of momentum:
(a) kg m/s
(b) m/s
(c) N
(d) kg
Answer: (a)
SEBA Class 9 Science Chapter 9 Multiple Choice Questions
31. Momentum has:
(a) Only direction
(b) Only magnitude
(c) Both magnitude & direction
(d) No direction
Answer: (c)
32. A heavier ball with same velocity has:
(a) Less momentum
(b) More momentum
(c) No momentum
(d) Equal momentum
Answer: (b)
33. A fast-moving small bullet has large momentum because of its:
(a) Small mass
(b) High velocity
(c) Shape
(d) Weight
Answer: (b)
34. Rate of change of momentum gives:
(a) Mass
(b) Velocity
(c) Force
(d) Acceleration
Answer: (c)
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35. Mathematical form of second law:
(a) F = mv
(b) F = ma
(c) F = m + a
(d) F = m − a
Answer: (b)
36. 1 newton is force needed to give:
(a) 1 kg, 2 m/s²
(b) 2 kg, 1 m/s²
(c) 1 kg, 1 m/s²
(d) 0.5 kg, 1 m/s²
Answer: (c)
37. A fielder pulls hands backward while catching to:
(a) Increase force
(b) Reduce time
(c) Increase stopping time
(d) Stop momentum
Answer: (c)
38. Increasing stopping time:
(a) Increases force
(b) Reduces force
(c) Has no effect
(d) Makes ball faster
Answer: (b)
39. Landing on sand is safer because sand:
(a) Is soft
(b) Increases stopping time
(c) Reduces time
(d) Increases acceleration
Answer: (b)
40. A karate player breaks a slab by:
(a) Decreasing time of impact
(b) Increasing mass
(c) Reducing momentum
(d) Reducing force
Answer: (a)
Force and Laws of Motion Class 9 SEBA MCQ Notes
41. If F = 0, then acceleration =
(a) 1
(b) 0
(c) Maximum
(d) Negative
Answer: (b)
42. From Second Law, First Law emerges when:
(a) F = ma
(b) F = 0
(c) a = 1
(d) m = 0
Answer: (b)
43. Newton’s Third Law states:
(a) F = ma
(b) Action = reaction
(c) Force changes motion
(d) Every object has inertia
Answer: (b)
44. Action and reaction forces act on:
(a) Same body
(b) Different bodies
(c) Frictionless bodies
(d) Only heavy bodies
Answer: (b)
45. Action and reaction are:
(a) Equal and same direction
(b) Equal and opposite
(c) Unequal and opposite
(d) Unequal and same direction
Answer: (b)
46. Kicking a football is an example of:
(a) First Law
(b) Second Law
(c) Third Law
(d) Inertia
Answer: (c)
47. When a gun is fired, it recoils due to:
(a) Friction
(b) Gravity
(c) Action–reaction pair
(d) Low mass
Answer: (c)
48. Bullet has more acceleration than gun because:
(a) More mass
(b) Less mass
(c) More friction
(d) More force
Answer: (b)
49. Walking is possible because we:
(a) Push the ground backward
(b) Pull the ground forward
(c) Reduce friction
(d) Increase mass
Answer: (a)
50. Ground pushes us forward with:
(a) Inertia
(b) Friction
(c) Reaction force
(d) Momentum
Answer: (c)
Class 9 Science Chapter 9 MCQ Question Answer SEBA 2026-27
51. A sailor jumping from a boat makes it move backward due to:
(a) Gravity
(b) Action–reaction
(c) First Law
(d) Momentum only
Answer: (b)
52. In a spring balance experiment, both balances show:
(a) Different readings
(b) Equal readings
(c) Zero reading
(d) No reading
Answer: (b)
53. If A pushes B, then B pushes A with:
(a) Less force
(b) More force
(c) Equal force
(d) No force
Answer: (c)
54. Action–reaction forces occur:
(a) One after another
(b) At different times
(c) Simultaneously
(d) Randomly
Answer: (c)
55. Third law forces:
(a) Cancel each other
(b) Act on same object
(c) Act on different objects
(d) Stop motion
Answer: (c)
56. In the carom coin activity, the bottom coin moves out quickly when hit sharply because:
(a) The upper coins push it out
(b) Only the bottom coin has inertia
(c) The hit removes friction completely
(d) The upper coins tend to remain at rest due to inertia
Answer: (d)
57. In the carom coin activity, after the bottom coin is removed, the remaining coins fall vertically because:
(a) Gravity acts only on the upper coins
(b) Their inertia keeps them at rest
(c) They lose balance and fall straight down
(d) The striker pulls them down
Answer: (b)
58. In the “coin and card on tumbler” activity, the coin falls into the glass because:
(a) Air pushes the coin down
(b) The coin has inertia and remains at rest
(c) The card pulls the coin down
(d) The coin becomes lighter when card moves
Answer: (b)
59. The card must be flicked sharply in the coin–card–tumbler activity because:
(a) Slow motion reduces friction
(b) Slow motion increases inertia
(c) Fast motion prevents the coin from moving with the card
(d) Fast motion increases gravity
Answer: (c)
60. When a person turns quickly with a tray of water, the water spills because:
(a) Water has low density
(b) Water has inertia and continues moving in its original direction
(c) The tray becomes lighter
(d) Gravitational force becomes weak
Answer: (b)
SEBA Class 9 Science Chapter 9 MCQ Solutions
61. Which property of water causes it to spill when the tray is turned suddenly?
(a) Elasticity
(b) Fluidity
(c) Inertia
(d) Viscosity
Answer: (c)
62. When two children throw a sandbag while standing on carts, each child experiences a backward push because of:
(a) Gravity
(b) Newton’s third law of motion
(c) Reduced friction on wheels
(d) The weight of the bag
Answer: (b)
63. When the child throws a sandbag forward while standing on a cart:
(a) The cart moves forward
(b) The cart moves backward
(c) The cart stops moving
(d) The cart becomes heavier
Answer: (b)
64. What happens to the cart of a child who catches the sandbag thrown towards them?
(a) It moves backward
(b) It moves forward
(c) It remains stationary
(d) It jumps up due to force
Answer: (a)
(Cart moves in the direction of the bag’s motion.)
65. The white line on cartwheels in the sandbag activity helps to observe:
(a) Speed of cart
(b) Weight of cart
(c) Shape of wheels
(d) Colour changes
Answer: (a)
🔬 Updated MCQ Guide Notice: This page features a full collection of SEBA Class 9 Science Chapter 9 (Force and Laws of Motion) Multiple Choice Questions (MCQs) with accurate options and step-by-step explanations, fully updated for the 2026–27 academic session in accordance with the latest revised Assam Board (SEBA) textbook.
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