# Class 9 Science Chapter 9 Force and Laws of Motion MCQ Questions with Answer

Force and Laws of Motion Class 9 MCQ is one of the best strategies to prepare for the CBSE Class 9 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more Force and Laws of Motion class 9 MCQ which will help them all through their board test.

## Force and Laws of Motion Class 9 MCQ Questions with Answer

Class 9 Science MCQ with answers are given here to Chapter 9 Force and Laws of Motion. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 9 Science syllabus. By Solving these Class 9 MCQs, you will be able to analyze all of the concepts quickly in the Chapter and get ready for the Class 9 Annual exam.

Learn Force and Laws of Motion Class 9 MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 9 Force and Laws of Motion MCQ with answers given below.

Question 1: The action and reaction forces referred to in the third law
(a) Must act on different objects
(b) Must act on the same objec
(c) May act on different objects
(d) Need not be equal in magnitude but act in the same direction

A

Question 2 : An object will continue to accelerate until the
(a) Resultant force begins to decrease
(b) The velocity changes direction
(c) Resultant force on it is increased continuously
(d) Resultant force on it is zero

D

Question 3: Qualitative definition of Force is given by
(a) Newtons first law of motion
(b) Newtons Second law of motion
(c) Newtons third law of motion
(d) Newtons law of gravitation

A

#### Question 4: The object shown below moves with constant velocity. Two forces are acting on the object. Considering negligible friction , the resultant force will be

(a) 17 N leftwards
(b) 7N rightwards
(c) 3 N leftwards
(d) 10 N leftwards

C

Question 5: In the following example, try to identify the number of times the velocity of ball changes – A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team.
(a) Five times
(b) Three times
(c) Four times
(d) Six times

B

Question 6: There will be a change in the speed or in the direction of motion of a body when it is acted upon by
(a) An Unbalanced force
(b) Balanced Force
(c) Uniform force
(d) Zero Force

A

Question 7 : A hammer of mass 500 g, moving at 50m/s, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. The force of the nail on the hammer is
(a) 3500N
(b) 1000N
(c) 2500N
(d) 500N

C

Question 8: An object of mass 2 kg is sliding with a constant velocity of 4 m/ s on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
(a) 8N
(b) 2N
(c) 32N
(d) 0 N

D

Question 9: Inertia is a measure of
(a) Mass
(b) velocity
(c) Force
(d) acceleration

A

Question 10 : Type of inertia that tends to resist the change in case of an -Athlete often jumps before taking a long jump
(a) Inertia of motion
(b) Inertia of rest
(c) Inertia of direction
(d) Uniformly accelerated motion

A

Question 11: A passenger in a moving train tosses a coin which falls
(a) Behind him
(b) In front of him
(c) Falls outside the train
(d) Will not move

A

Question 12: A bullet of mass 20gm is fired from a gun of mass 8kg with a velocity of 400 m/s, calculate the recoil velocity of gun
(a) -2m/s
(b) 1m/s
(c) 2m/s
(d) -1m/s

D

Question 13 : Rocket works on the principle of conservation of
(a) Energy
(b) Mass
(c) momentum
(d) velocity

C

Question 14. If a bus starts suddenly, the passengers in the bus will tend to fall
(a) In the direction opposite to the direction of motion of bus.
(b) In the same direction as the direction of motion of bus.
(c) Sideways.
(d) None of the above.

A

Question 15 : Formula to find the Force is
(a) F= ma
(b) F= m/a
(c) F= a/m
(d) a=Fm

A

Question 16: Force required in accelerating a 2 kg mass at 5 m/s2 and a 4 kg mass at 2 m/s2
(a) 2kg mass at 5m/s2 is less than 4 kg mass at 2 m/s2
(b) Same in both the cases
(c) 2kg mass at 5m/s2 is greater than 4 kg mass at 2 m/s2
(d) Zero in both the cases

C

Question 17 . A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to:
(a) Exert large force on the ball
(b) Increases the force exerted by the ball on hands
(c) Increase the rate of change of momentum
(d) Decrease the rate of change of momentum

D

Question 18 . 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

D

Question 19.: An object will continue to accelerate until
(a) The resultant force begins to decrease.
(b) The resultant force on it is zero.
(c) The velocity changes direction.
(d) The resultant force on it is increased continuously.

B

Question 20. Which of the following is the unit of linear momentum?
(a)  kg m/s
(b) kg ms
(c) kgms−2
(d) kg

B

Question 21. A plate, a ball and a child all have the same mass. The one having more inertia is the
(a) plate
(b) ball
(c) child
(d) All have equal inertia

D

Question 22. Inertia is a property of a body by virtue of which the body is
(a) Unable to change by itself the state of rest.
(b) Unable to change by itself the state of uniform motion in a straight line.
(c) Unable to change by itself the direction of motion.
(d) Unable to change by itself the state of rest or uniform motion in a straight line.

D

Question 23 . When a force is exerted on an object, it can change its:
(a) State
(b) Position
(c) Shape
(d) All the above

D

Question 24 . Rocket works on the principle of conservation of
(a) velocity
(b) Mass
(c) Linear Momentum
(d) Energy

C

Question 25 . The seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and saved from getting injured. Can you guess the law due to which a person falls in forward direction on the sudden stopping of the car?
(a) Newton’s first law of motion
(b) Newton’s second law of motion
(c) Newton’s third law of motion
(d) Newton’s law of gravitation

A

Question 26 . The S.I. unit of force is
(a) Newton-metre
(b) Newton
(c) Newton per second
(d) Newton per square metre

B

Question 27 . Rate of change of momentum is equal to
(a) Acceleration
(b) Work done
(c) Force
(d) Impulse

C

Question 28 . The action and reaction forces referred to in the third law
(a) Must act on the same object.
(b) May act on different objects.
(c) Must act on different objects.
(d) Need not be equal in magnitude but must have the same direction.

C

Question 29 . 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

B

Question 30. An object of mass 20 kg is moving with a velocity of 10 m/s. Its momentum will be:
(a) 2000 kg.m/s
(b) 20 kg.m/s
(c) 2 kg.m/s
(d) 200 kg.m/s

D

Question 31 . 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

B

Whoever needs to take the CBSE Class 9 Board Exam should look at this MCQ. To the Students who will show up in CBSE Class 9 Science Board Exams, It is suggested to practice more and more questions. Aside from the sample paper you more likely had solved. These Force and Laws of Motion Class 9 MCQ are ready by the subject specialists themselves.

Question 32 . 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

D

Question 33. 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

D

Question 34 . When unbalanced forces act on a body, the body:
(a) Must move with uniform velocity
(b) Must remain at rest
(c) Must experience acceleration
(d) Must move in a curved path

C

Question 35 . A passenger in a moving train tosses a coin which falls behind him. Observing this statement what can you say about the motion of the train?
(a) Accelerated
(b) Retarded
(c) Along circular tracks
(d) Uniform

A

Question 36 . Acceleration acts always in the direction __________
(a) of the displacement
(b) of the initial velocity
(c) of the net force
(d) of the final velocity

C

Question 37 . Which of the following situations involves the Newton’s second law of motion?
(a) A force can stop a lighter vehicle as well as a heavier vehicle which are moving
(b) A force exerted by a lighter vehicle on collision with a heavier vehicle results in both the (vehicles coming to a standstill
(c) A force can accelerate a lighter vehicle more easily than a heavier vehicle which are moving
(d) A force exerted by the escaping air from a balloon in the downward direction makes the balloon to go upwards

C

Question 38 . A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to:
(a) Exert large force on the ball
(b) Increases the force exerted by the ball on hands
(c) Increase the rate of change of momentum
(d) Decrease the rate of change of momentum.

D

Question 39 . Essential characteristic of equilibrium is
(a) K. E equals zero
(b) acceleration equals zero
(c) momentum equals zero
(d) none of the above

B

Question 40 . If a bus starts suddenly, the passengers in the bus will tend to fall

(a) In the direction opposite to the direction of motion of bus.

(b) In the same direction as the direction of motion of bus.

(c) Sideways.

(d) None of the above.

A

Question 41 . An object of mass 6 kg is sliding on horizontal surface, with a uniform velocity of 8 m/ s . Assuming force of friction offered by the surface to be zero, The force required to maintain the motion of object with the same uniform velocity is
(a) 0 Newton
(b) 2 Newtons
(c) 8 Newtons
(d) 32 Newtons

D

Question 42 . A man wearing a bullet-proof vest stands on roller skates. The total mass is 80 kg. A bullet of mass 20 g is fired at 400 m/s. It is stopped by the vest and falls to the ground. What is then the velocity of the man?
(a) 1 m/s
(b) 0.1 m/s
(c) 0.01 m/s
(d) 0 m/s

B

Question 43 . Frictional force
(a) always in the opposite director of motion
(b) always opposes motion of a body
(c) always opposes relative motion between the surfaces of contact
(d) always in the direction of motion

C

Question 44: A body of weight W is suspended from the ceiling of a room through a rope of weight R. The ceiling pulls the rope by a force of
(a) W
(b) R
(c) W + R
(d) (W+R)/2

C

Question 45 . Rocket works on the principle of conservation of:
(a) mass
(b) energy
(c) momentum
(d) velocity

C

Question 46 . Friction is:
(a) useful to us
(b) harmful to us
(c) both useful as well as harmful to us
(d) none of them.

C

Question 47 . What is the momentum of a body of mass 2m and velocity v/2?
(a) mv/4
(b) mv
(c) 2mv
(d) mv/2

B

Question 48 . A mass M breaks into two pieces in the ratio 1 : 3 while at rest. If the heavier has a speed of v, the speed of the lighter is
(a) v
(b) 2v
(c) 3v
(d) 4v

C

Question 49. 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

D

Question 50. The inertia of an object tends to cause the object ______.
(a) to increase its speed.
(b) to decrease its speed.
(c) to resist any change in the state of rest or of motion.
(d) to decelerate due to friction.

C

Question 51. A unit of force is
(a) Joule – m
(b) Joule
(c) Newton – m
(d) Kg ms−2

D

Question 52 . __________ is a force, which always opposes the motion of one body over the other body in contact with it
(a) Gravitational force
(b) Reaction force
(c) Normal force
(d) Frictional force

D

Question 53. Essential characteristic of equilibrium is
(a) K. E equals zero
(b) acceleration equals zero
(c) momentum equals zero
(d) none of the above

B

Question 54. A carpenter exerts a force of magnitude 1.5 N at right angles to the surface of a nail of mass 3 gram to drive it into the wood. If wood offers a resistive force of 0.6 N and the time of interaction of hammer and the nail 0.01 s, the depth through which the nail penetrates is
(a) 15m
(b) 1.5 cm
(c) 15 cm
(d) 1.5 mm

B

Question 55. A gun of mass 5kg fires 50gm bullet with a velocity of 200m/s. Find the recoils velocity of the gun.
(a) -2 m/s
(b) 20 m/s
(c) Zero
(d) 0.2m/s

A

Question 56 . When no external force acts on an object, the physical quantity that remains conserved is______.
(a) velocity
(b) momentum
(c) acceleration
(d) force

B

Question 57 . A plate, a ball and a child all have the same mass. The one having more inertia is the
(a) plate
(b) ball
(c) child
(d) All have equal inertia

A

Question 58. When a force is exerted on an object, it can change its:
(a) State
(b) Position
(c) Shape
(d) All the above

D

Question 59. When a bus starts suddenly from rest, the passengers sitting inside the bus move backwards. This illustrates an example of
(a) Newton First Law of Motion
(b) Newton Second Law of Motion
(c) Newtons Third Law of Motion
(d) None of these

A

Question 60. The relation between acceleration, mass and force is given by:
(a) a x F = m
(b) F = m/a
(c) F x m = a
(d) a = F/m

D

Question 61. 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.

B

Question 62 . 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

D

Question 63. A mass M breaks into two pieces in the ratio 1 : 3 while at rest. If the heavier has a speed of v, the speed of the lighter is
(a) v
(b) 2v
(c) 3v
(d) 4v

C

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