In This Post we are providing Chapter-5 Laws of Motion NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON LAWS OF MOTION
Question 1: 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
Answer: first law of motion
Question 2: 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
Answer: cannot be an inertial frame because earth is revolving round the sun
Question 3: 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
Answer: same as that of the net force
Question 4: 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
Answer: the combination of forces acting on it balances each other
Question 5: 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
Answer: man standing on earth
Question 6: 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.
Answer: must be equal to the force applied by the monkey on the rope
Question 7: 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
Answer: whether force is applied on M or m
Question 8: 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
Answer: 24 N
Question 9: 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.
Answer: Friction does not depend on the area in contact
Question 10: 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
Answer: the normal reaction
Question 11: If the applied force is doubled, then coefficient of friction is
- a) not changed
- b) tripled
- c) halved
- d) doubled
Answer: not changed
Question 12: 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
Answer: Kinetic friction is always greater than rolling friction
Question 13: 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
Answer: 0.98 N
Question 14 : 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
Answer: The direction of motion changes
Question 15: 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
Answer: Component of normal reaction
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