NCERT Class 11 Chapter 5 Physics Laws of Motion MCQ

NCERT Class 11 Chapter 5 Physics Laws of Motion MCQ | Questions & Answers: Are you guys searching for a website to take up the multiple-choice questions quiz on NCERT Class 11 Chapter 5 Physics Laws of Motion topic? if yes then you are at the right portal. In the below section we have provided a series of MCQ questions that will help you learn about new things regarding the Laws of Motion topic.

Page 1 of 3

1. Newton's first law of motion describes the

A. inertia

B. energy

C. work

D. moment of inertia

2. Inertia is the property of a body linked to tendency of a body

A. to resist any change in its state

B. to change the momentum

C. to change its direction

D. to change its position

3. Physical independence of force is a consequence of

A. first law of motion

B. third law of motion

C. second law of motion

D. all of these

4. A reference frame attached to the earth

A. cannot be an inertial frame because earth is revolving round the sun

B. is an inertial frame by definition

C. is an inertial frame because Newton's laws are applicable

D. is an inertial frame because the earth is rotating about its own axis

5. The direction of impulse is

A. same as that of the net force

B. opposite to that of the net force

C. same as that of the final velocity

D. same as that of the initial velocity

6. When a body is stationary

A. the combination of forces acting on it balances each other

B. the body is in vacuum

C. the force acting on it is not in contact with it

D. there is no force acting on it

7. When an elevator cabin falls down, the cabin and all the bodies fixed in the cabin are accelerated with respect to

A. man standing on earth

B. ceiling of elevator

C. floor of elevator

D. man standing in the cabin

8. A monkey is climbing up a rope, then the tension in the rope

A. must be equal to the force applied by the monkey on the rope

B. must be less than the force applied by the monkey on the rope.

C. must be greater than the force applied by the monkey on the rope

D. may be equal to, less than or greater the force applied by the monkey on the rope

9. If two masses (M & m) are connected on a horizontal plane and a force is applied on the combination, then the tension T depends on

A. whether force is applied on M or m

B. the force applied on the system

C. Can’t be predicted

D. None of these

10. A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s2, the reading of the spring balance will be

A. 24 N

B. 74 N

C. 15 N

D. 49 N

Page 2 of 3

11. Identify the correct statement from the following

A. Friction does not depend on the area in contact

B. Friction is always less than the applied force

C. Friction depends on the volume of body

D. Friction depends on the area of contact.

12. The coefficient of static friction between two surfaces depends upon

A. the normal reaction

B. the shape of the surface in contact

C. the magnitude of applied force

D. None of these

13. If the applied force is doubled, then coefficient of friction is

A. not changed

B. tripled

C. halved

D. doubled

14. Which of the following statements about friction is true?

A. Kinetic friction is always greater than rolling friction

B. Frictional force is proportional to the area of contact between the two surfaces

C. Frictional force cannot accelerate a body

D. Friction can be reduced to zero

15. A block of mass 0.1kg is held against a wall applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is:

A. 0.98 N

B. 4.9 N

C. 0.49 N

D. 2.5 N

16. What are the effects if force is acting on a moving body in a direction perpendicular to the direction of motion

A. The direction of motion changes

B. All of these

C. The acceleration changes uniformly

D. The speed changes uniformly

17. On a banked road, which force is essential to provide the necessary centripetal force to a car to take a turn while driving at the optimum speed?

A. Component of normal reaction

B. Component of frictional force

C. Both

D. None of these

18. A cyclist taking turn bends inwards while a car passenger taking the same turn is thrown outwards. The reason is

A. cyclist has to counteract the centrifugal force while in the case of car only the passenger is thrown by this force

B. difference in the speed of the two

C. car has four wheels while cycle has only two

D. car is heavier than cycle

19. A cyclist bends while taking turn in order to

A. provide required centripetal force

B. reduce apparent weight

C. reduce speed

D. reduce friction

20. A car moving on a horizontal road may be thrown out of the road in taking a turn

A. due to the lack of proper centripetal force

B. due to the rolling frictional force between the tyre and road

C. due to the reaction of the ground

D. by the gravitational force

Page 3 of 3

21. Two forces 6 N and 8 N act at a point O. If the angle between the lines of action of the force is 90°, then their resultant is

A. 14 N

B. 12 N

C. 10 N

D. 48 N

22. A body of mass 15 kg moving with a velocity of 10 m/s has its velocity reduced to 6 m/s in two seconds. The force that produced this change in velocity is

A. 60 N

B. 30 N

C. 45 N

D. 20 N

23. The frame of reference attached to a satellite of the earth is

A. an inertial frame

B. an absolute frame at rest with respect to the stars

C. a non – inertial frame

D. a gravitational frame

24. A machine gun fires a bullet of mass 40 g with a velocity of 1200 ms-1. The man holding it can exert a maximum force on 144 N on the gum. How many bullets can he fire per second at the most?

A. one

B. four

C. two

D. three

25. A block of mass M is placed on a flat surface. A force is applied to move it parallel to the surface. The frictional force f developed is proportional to the

A. square of the mass of the body

B. mass of the body

C. reciprocal of the mass of the body

D. reciprocal of the square of the body