Students of class 9 Science should refer to MCQ Questions Class 9 Science Force And Laws Of Motion with answers provided here which is an important chapter in Class 9 Science NCERT textbook. These Multiple Choice Questions have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 9 Science. The following MCQs can help you to practice and get better marks in the upcoming class 9 Science examination

Question. Inertia depends upon –
(A) acceleration of the body
(B) velocity of the body
(C) shape of the body
(D) mass of the body

Question. Which of the following has largest inertia?
(A) A pin
(B) An ink pot
(C) Your physics book
(D) Your body

Question. Newton’s second law of motion-
(A) defines force
(B) defines inertia
(C) gives measure of force
(D) none of these

Questions. Newton’s second law of motion is –
(A) qualitative
(B) quantitative
(C) both qualitative and quantitative
(D) neither qualitative nor quantitative

Questions. Forces of action and reaction are:
(A) equal and in same direction
(B) equal and in opposite direction
(C) unequal and in same direction
(D) unequal and opposite.

Questions. Forces of action and reaction –
(A) one after the other on same body
(B) simultaneously on same body
(C) one after the other on different bodies
(D) simultaneously on different bodies

Questions. If the action and reaction were to act on the same body-
(A) the resultant would be zero
(B) the body would not move at all
(C) both A and B are correct
(D) neither A nor B is correct

Questions. Consider two spring balances hooked as shown in the figure. We pull them in opposite directions. If the reading shown by A is 1.5 N, the reading shown by B will be – A B
(A) 1.5 N
(B) 2.5 N
(C) 3.0 N
(D) zero

Questions. A Diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 ms–1. The accelerating force on the rocket is:
(A) 20 dyne
(B) 20 Newton
(C) 20 kg wt.
(D) sufficient data not given

Questions. The forces of action and reaction have …………….. magnitude but ……………. direction-
(A) same, same
(B) same, opposite
(C) opposite, same
(D) opposite, opposite

Question. A body of mass 20 kg moves with an acceleration of 2ms–2. The rate of change of momentum in S.I. unit is –
(A) 40
(B) 10
(C) 4
(D) 1

Question. 9.8 N is equal to-
(A) 1 kgf
(B) 1 kgwt
(C) A and B both
(D) Neither A nor B

Question. Newton’s first law of motion is –
(A) qualitative
(B) quantitative
(C) both qualitative and quantitative
(D) neither qualitative nor quantitative

Question. When a bus starts suddenly the passengers standing on it, lean backwards in the bus. This is an example of –
(A) Newton’s first law
(B) Newton’s second law
(C) Newton’s third law
(D) none of Newton’s law

Question. If A and B are two objects with masses 10 kg and 30 kg respectively then :
(A) A has more inertia than B
(B) B has more inertia than A
(C) A and B have the same inertia
(D) none of the two have inertia

Question. An iron ball and aluminium ball has same mass:
(A) inertia of iron is greater than aluminium
(B) both the ball have same inertia
(C) inertia of iron is less than that of Aluminium
(D) none of these

Question. A bullet of mass 0.01 kg is fired from a gun weighing 5.0 kg. If the initial speed of the bullet is 250 m/s, calculate the speed with which the gun recoils-
(A) – 0.50 m/s
(B) – 0.25 m/s
(C) + 0.05 m/s
(D) + 0.25 m/s

Question. A man is standing on a boat in still water. If he walks towards the shore the boat will –
(A) move away from the shore
(B) remain stationary
(C) move towards the shore
(D) sink

Question. A bullet in motion hits and gets embedded in a solid resting on a frictionless table. What is conserved ?
(A) Momentum and K.E.
(B) Momentum alone
(C) K.E. alone
(D) None of these

Question. Choose correct statement-
(A) Action and reaction forces act on same object.
(B) Action and reaction forces act on different objects.
(C) A and B both are possible.
(D) Neither A nor B is correct.

Question. Gram weight is a unit of-
(A) mass
(B) weight
(C) A and B both
(D) neither A nor B

Question. A body of mass 5 kg undergoes a change in speed from 20 m/s to 0.20 m/s. The momentum-
(A) increases by 99 kgm/s
(B) decreases by 99 kgm/s
(C) increases by 101 kgm/s
(D) decreases by 101 kgm/s

Question. Newton used, ‘quantity of motion’ for-
(A) momentum
(B) force
(C) acceleration due to gravity
(D) none of these

Question. When a bus starts suddenly the passengers standing on it, lean backwards in the bus. This is an example of –
(A) Newton’s first law
(B) Newton’s second law
(C) Newton’s third law
(D) none of Newton’s law

Question. Momentum measures amount of ………… in a body-
(A) inertia
(B) motion
(C) velocity
(D) acceleration

Question. Force measures rate of change of ……….. a body
(A) mass
(B) inertia
(C) velocity
(D) momentum

Question. Inertia of rest is the property by virtue of which the body is unable to change by itself:
(A) the state of rest only
(B) the state of uniform linear motion
(C) the direction of motion only
(D) the steady state of rest

Question. A body of mass M strikes against wall with a velocity v and rebounds with the same velocity. Its change in momentum is –
(A) zero(B) Mv(C) –Mv
(B) Mv
(C) –Mv
(D) –2 Mv

Question. First law of motion defines-
(A) inertia
(B) force
(C) both inertia and force
(D) neither inertia nor force

Question. If a moving ball A collides with another moving ball B, then
(A) momentum of A = momentum of B
(B) (momentum A + momentum of B) before collision = (momentum A + momentum of B) after collision
(C) neither A nor B
(D) A or B both are possible

We hope the above multiple choice questions for Class 9 Science for Chapter 9 Force And Laws Of Motion provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Force And Laws Of Motion is an important chapter in Class 9 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 9 commerce students. Please go though these and let us know if you have any feedback in the comments section.