Laws of Motion Class-9 Exe-3A MCQs Concise Physics ICSE Selina Solutions Ch-3. In this article you would learn to solve MCQS on contact and non contact force. Visit official Website CISCE for detail information about ICSE Board Class-9.
Laws of Motion Class-9 Exe-3A MCQs Concise Physics ICSE Selina Solutions Ch-3
| Board | ICSE |
| Class | 9 |
| Subject | Physics |
| Writer / Publication | Concise Selina Publishers |
| Chapter-3 | Laws of Motion |
| Exe – 3A | Contact and Non-contact Forces |
| Topics | Solution of Exe-3(A) MCQs Type |
| Academic Session | 2025-2026 |
Laws of Motion Class-9 Exe-3A MCQs Concise Physics ICSE Selina Solutions Ch-3
Page 64 (Choose the correct answer from the options given below).
Que-1: A force can change :
(a) the size or shape of a body
(b) the state of rest or of motion of a body
(c) the dimensions of a body
(d) All of the above
Ans: (d) All of the above
Hint- Force when applied on a body can produce the following two main effects :
It can change the state of rest or of motion of the body.
It can change the size or shape of the body i.e., it can change the dimensions of the body.
Que-2: Which of the following is a contract force ?
(a) electrostatic force
(b) gravitational force
(c) frictional force
(d) magnetic force
Ans: (c) frictional force
Que-3: The non-contact force is ;
(a) force of reaction
(b) force due to gravity
(c) tension in string
(d) force of the friction
Ans: (b) force due to gravity
Hint- The forces experienced by bodies even without being physically in touch, are called non-contact forces. Hence, out of the given options, force due to gravity is a non-contact force.
Que-4: A ball placed on a table starts rolling down when the table is tilted. This is an example of :
(a) contact force
(b) non-contact force
(c) both (a) and (b)
(d) none of these
Ans: (d) non-contact force
Hint- The force on a body due to earth’s attraction is called the force of gravity or the weight of the body and it is a non-contact force.
Que-5: When a comb is rubbed on dry hair, it gets charged. This is an example of :
(a) Gravitational force
(b) normal reaction force
(c) magnetic force
(d) electrostatic force
Ans: (d) electrostatic force
Que-6: The nature of gravitational force is always :
(a) repulsive
(b) attractive
(c) depends on the bodies involved
(d) None of the above
Ans: (b) attractive
Hint- In the universe each particle attracts the other particle due to its mass. This force of attraction between them is called gravitational force.
Que-7: The magnitude of a non-contact force between two bodies …………… with an increase in their separation and …………… with a decrease in their separation.
(a) increases, decreases
(b) decreases, increases
(c) increases, increases
(d) decreases, decreases
Ans: (b) decreases, increases
Hint- The magnitude of non-contact force between two bodies depends on the distance of separation between them. It decreases with the increase in separation and increases as the separation decreases.
Que-8: On doubling the separation between two bodies the magnitude of the non-contact force between them becomes :
(a) one-eighth
(b) one-half
(c) one-fourth
(d) remains the same
Ans: (c) one-fourth
Hint- Magnitude of non-contact force varies inversely as the square of distance of separation i.e., on doubling the separation, the force becomes one-fourth.
Que-9: A spring balance works on the principle of :
(a) gravitational force
(b) magnetic force
(c) restoring elastic force
(d) frictional force
Ans: (c) restoring elastic force
Hint- In a spring balance, a spring is fixed at one end with a hook attached to an object at the other end. When the spring is stretched, the spring exerts a force F opposite to the direction of displacement of its free end, the magnitude of this force is directly proportional to the magnitude of displacement. This force is restoring force.
Que-10: A horizontal spring with two object A and B attached to its ends are shown in the figure below. If the spring is compressed, it …………… each object and if it is stretched, it …………… each object.
(a) pushes, pulls
(b) pulls, pushes
(c) pushes, pushes
(d) pulls, pulls
Ans: (a) pushes, pulls
Hint- As the spring has the tendency to regain its original form or shape due to restoring force, therefore, if the spring is compressed, it pushes away each object and if it is stretched, it pulls in each object.
— : End of Laws of Motion Class-9 Exe-3A MCQs Concise Physics ICSE Selina Solutions Ch-3 :–
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