CBSE Class 9 Science Chapter 9 “Force and Laws of Motion” Multiple Choice Questions with Answers
Force and Laws of Motion MCQ – Here is a compilation of Free MCQs of Class 9 Science Book Chapter 9 Force and Laws of Motion with Answers. Students can practice free MCQs as have been added by CBSE in the new Exam pattern. At the end of Multiple- Choice Questions, the answer key also has been provided for your reference.
Q.1. Match the following.
| Column I | Column Il |
| a. SI unit of force | P. g cm/s |
| b. CGS unit of impulse | Q. cm/s2 |
| c. SI unit of change in momentum | R. kg m/s2 |
| d. CGS unit of acceleration | S. kg m/s |
(a) a-R, b-P, c-S, d-Q
(b) a-Q, b-R, c-P, d-S
(c) a-S, b-R, c-P, d-Q
(d) a-R, b-Q, c-S, d-P
Q.2. Newton’s second law of motion is ________.
(a) F = mv
(b) F = p2 – p1 t2 – t1
(c) F = v2 – v1 t2 – t1
(d) F = s2 – s1 t2 – t1
Q.3. Force is the rate of change of _______.
(a) momentum
(b) velocity
(c) displacement
(d) acceleration
Directions for Question no. 4 and 5: Answer the questions based on the situation explained.
An object of mass 100 g moving with a velocity of 10 m/s comes to rest in 0.3 second.
Q.4. The magnitude of the impulse on the object is ____.
(a) 0 N s
(b) 107 dyne s
(c) 1 N s
(d) 10 N s
Q.5. The average force acted on the object is ______.
(a) 0.1 N
(b) 0.003 N
(c) 3.3 N
(d) 3 N
Q.6. In SI system, the gravitational unit of force is ________.
(a) kg m s-2
(b) kgf
(c) m/s
(d) metre
Q.7. Identify the force which cannot act without any physical contact.
(a) frictional force
(b) gravitational force
(c) electrostatic force
(d) magnetic force
Q.8. The frictional force that is dependent on the area of surfaces in contact is __________friction.
(a) static
(b) rolling
(c) sliding
(d) kinetic
Q.9. Which one of the following is not a vector quantity?
(a) Speed
(b) Momentum
(c) Impulse
(d) Force
Q.10. Which of the following objects has greater inertia? (consider that all these objects are of the same size)
(a) a thermocol ball
(b) a plastic ball
(c) a paper ball
(d) a solid iron ball
Q.11. 1 kgf is equal to _________.
(a) 9.8 N
(b) 980 dynes
(c) 9800 kg m s-2
(d) 105 dynes
Q.12. Which of the following statements is true about force?
(a) It cannot be seen.
(b) It can move a stationary body.
(c) It can change the shape of a body.
(d) All of the above
Q.13. A body of mass 3 kg moves with a velocity of 500 cm/s, the momentum of the body is _______.
(a) 150 kg m/s
(b) 15 x 109 kg m/s
(c) 15 x 10-9 kg m/s
(d) 15 kg m/s
Q.14. If the velocity-time graph representing the motion of a body is parallel to time-axis, then the net force acting on the body is _____.
(a) 10 N
(b) 100 N
(c) 1 N
(d) None of these
Q.15. Linear momentum of an object is 250 g cm/s. If the velocity of the object is 5 m/s, then the mass of the object is _____.
(a) 5 Kg
(b) 0.5 g
(c) 5 mg
(d) 0.5 mg
Answer Key for Class 9 Science Chapter 9 Force and Laws of Motion MCQs
| Q. | Ans | Q. | Ans |
| 1 | (a) | 9 | (a) |
| 2 | (b) | 10 | (d) |
| 3 | (a) | 11 | (a) |
| 4 | (d) | 12 | (d) |
| 5 | (c) | 13 | (b) |
| 6 | (b) | 14 | (c) |
| 7 | (a) | 15 | (b) |
| 8 | (b) |
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