MCQ Questions | Class 9 Science Chapter 9 | Force and Laws of Motion with Answers

MCQ | Force and Laws of Motion Class 9 | Part-2

Check the below NCERT MCQ Questions for Class 9 Science Chapter 9 Force and Laws of Motion with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Force and Laws of Motion Class 9 Science MCQs Questions with Answers to help students understand the concept very well.

Objective Question | NCERT Science Class 9

NCERT Solutions Class 9 Science
Book:	National Council of Educational Research and Training (NCERT)
Board:	Central Board of Secondary Education (CBSE)
Class:	9th
Subject:	Science
Chapter:	9 ( Part-2 )
Chapters Name:	Force and Laws of Motion
Medium:	English

Ncert Solutions for Class 9 Science | Objective Type Questions

You can refer to NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Force and Laws of Motion | Class 9 Science | NCERT Solutions

Q1.	1-kg object is lying on the ground. An unbalanced force of magnitude 1 N is applied to the object. Which of these options explains the motion of the object as a result of the acting force?
	A. The object will accelerate in the direction of the applied force.
	B. The object will accelerate in a direction perpendicular to the applied force.
	C. The object will decelerate in the direction of the applied force.
	D. The object will remain at rest

Ans: The object will accelerate in the direction of the applied force.

Q2.	When a 12 N force acts on 3 kg mass for a second, the change in velocity is (in m/s)
	A.36
	B.4
	C.2
	D.18

Ans: 4

Q3.	A passenger in a moving train tosses a coin which falls behind him. It means that the motion of the train is
	A. accelerated
	B. uniform
	C. retarded
	D. along circular tracks

Ans: accelerated

Q4.	Force is defined as
	A. change in momentum
	B. rate of change of momentum
	C. the quantity that opposes inertia
	D. the quantity that keeps the velocity constant

Ans: rate of change of momentum

Q5.	A force is defined as a
	A. Fall
	B. Pull
	C. Push or Pull
	D. Push

Ans: Push or Pull

Q6.	What is the momentum of a body of mass 2m and velocity v/2?
	A. mv/4
	B. mv
	C. 2mv
	D. mv/2

Ans: mv

Q7.	Two equal masses m each moving in the opposite direction with the same speed v collide and stick to each other. The velocity of the combined mass is
	A. v
	B. 2v
	C. v/2
	D. zero

Ans: zero

Q8.	According to third law of motion, Action and reactions are happened at —–.
	A.Same time
	B.At different time
	C.Action happened first and then reaction.
	D.Reaction happened first and then action.

Ans: Same time

Q9.	Atrain of 10 wagon moves with constant velocity of 40 m/s for 3 minutes. The mass of each wagon is 10000 kg. Calculate net force on each wagon.
	A.500 N
	B.1000 N
	C.0 N
	D.Insufficient data to calculate force.

Ans: 0 N

Q10.	A wooden block of mass 20 kg accelerate at the rate of 4 m/s². Calculate applied force on the block.
	A.20 N
	B.40 N
	C.70 N
	D.80 N

Ans: 80 N

Q11.	In high jump competition the athlete is made to fall on a cushioned bed to:
	A. To decrease his momentum fast.
	B. Make him stop quickly.
	C. Increase the time to stop.
	D. Make him sleep comfortably.

Ans: Increase the time to stop.

Q12.	Momentum of a body of mass 0.5 kg moving with a speed of 10 m/s is
	A. 2.5 kg.m/s
	B. 5 kg.m/s
	C. 0.5 kg.m/s
	D. 50 kg.m/s

Ans: 5 kg.m/s

Q13.	An object of mass of 2 kg is sliding with a velocity of 4 ms^-1 on a frictional horizontal surface. The retarding force necessary to stop the object in 1 second is
	A. 2 N
	B. 4 N
	C. 8 N
	D. 0 N

Ans: 8 N

Q14.	The acceleration of an object is
	A. inversely proportional to its mass
	B. directly proportional to the applied force
	C. resisted by inertia
	D. all of the above

Ans: all of the above

Q15.	Which of the following has the largest momentum?
	A. A cat running down the street
	B. A pickup truck travelling down the highway.
	C. A large truck parked in a parking lot.
	D. A car parked in a parking lot.

Ans: A pickup truck travelling down the highway.

Q16.	According to Newton’s third law of motion, action and reaction
	A. always act on the same body
	B. always act on different bodies in opposite direction
	C. have same magnitudes and direction
	D. act on either body at normal to each other

Ans: always act on different bodies in opposite direction

Q17.	Which one of the following statements is not correct for an object moving along a straight path in an accelerated motion?
	A. Its speed keeps changing
	B. Its velocity always changes
	C. It always goes away from earth
	D. A force is always acting on it

Ans: It always goes away from earth

Q18.	Change in momentum when a car weighing 700kg changes its speed from 100m/s to 200 m/s is:
	A. 14000 kg.m/s
	B. 10500000 kg.m/s
	C. 21000000 kg.m/s
	D. 70000 kg.m/s

Ans: 70000 kg.m/s

Q19.	When balanced forces act on a body, the body:
	A. Must remain in its state of rest
	B. Must continue moving with uniform velocity, if already in motion
	C. Must experience some acceleration
	D. Both (A) and (B)

Ans: Both (A) and (B)

Q20.	If an object moves with a uniform velocity we can conclude that
	A. there is no force acting on the body
	B. no unbalanced force acts on it
	C. an unbalanced force acts on the body
	D. it has uniform acceleration

Ans: no unbalanced force acts on it

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