Here, you will get Class 11 Physics MCQ of Chapter 5 Laws Of Motion for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 11 Physics Chapter 5 Laws Of Motion, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 11 Physics with Answers on a daily basis and score well in exams.
Laws Of Motion Class 11 MCQs Questions with Answers
In an explosion, a body breaks up into two pieces of unequal masses. In this
(a) both parts will have numerically equal momentum
(b) lighter part will have more momentum
(c) heavier part will have more momentum
(d) both parts will have equal kinetic energy
Answer: (a) both parts will have numerically equal momentum
A jet engine works on the principle of
(a) conservation of mass
(b) conservation of energy
(c) conservation of linear momentum
(d) conservation of angular momentum
Answer: (c) conservation of linear momentum
External agencies like gravitational and magnetic forces …X… exerts force on a body from a distance. Here, X refers to
(a) can
(b) cannot
(c) never
(d) None of these
Answer: (a) can
A reference frame attached to the earth
(a) is an inertial frame by definition
(b) cannot be an inertial frame because earth is revolving round the sun
(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: (b) cannot be an inertial frame because earth is revolving round the sun
A man is standing at the centre of frictionless pond of ice. How can he get himself to the shore?
(a) By throwing his shirt in vertically upward direction
(b) By spitting horizontally
(c) He will wait for the ice to melt in pond
(d) Unable to get at the shore
Answer: (b) By spitting horizontally
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: (a) same as that of the net force
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: (a) man standing on earth
A passenger in a moving bus is thrown forward when the bus is suddenly stopped. This is explained
(a) by Newtons first law
(b) by Newtons second law
(c) by Newtons third law
(d) by the principle of conservation of momentum
Answer: (a) by Newtons first law
A spherical ball of mass 10-6 kg hits a wall 1000 times per second normally with a velocity of 1000 m/s and rebounds with same velocity along the initial direction. The force experienced by the wall is
(a) 1 N
(b) 4 N
(c) 2 N
(d) 8 N
Answer: (c) 2 N
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: (a) whether force is applied on M or m
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: (a) must be equal to the force applied by the monkey on the rope
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
Answer: (d) three
A block of wood is placed on a surface. A force is applied parallel to the surface to move the body. The frictional force developed acts
(a) normal to the surface upwards
(b) normal to the surface downwards
(c) along the direction of the applied force
(d) opposite to the direction of the applied force
Answer: (d) opposite to the direction of the applied force
A body is sliding down a rough inclined plane which makes an angle of 30 degree with the horizontal. If the coeffcient of friction is 0.26, the acceleration in m/s² is
(a) 1.95
(b) 2.78
(c) 3.47
(d) 4.6
Answer: (b) 2.78
A gun of mass 1000 kg fires a projectile of mass 1 kg with a horizontal velocity of 100 m/s. The velocity of recoil of the gun in the horizontal direction is
(a) 5 m/s
(b) 0.1 m/s
(c) 15 m/s
(d) 20 m/s
Answer: (b) 0.1 m/s
A rocket of mass 6000 kg is set for vertical firing, if the exhaust speed be 1 km s-1, the gas must be ejected to give the rocket an upward acceleration of 20 ms-2 is
(a) 120 kg/s
(b) 180 kg s-1
(c) 45 kg/s
(d) 90 kg/s
Answer: (b) 180 kg s-1
The acceleration of an astronaut is zero once he steps out of his accelerated spaceship in the intersteller space. this statement is in accordance with
(a) Newton’s second law of motion
(b) Newton’s first law of motion
(c) Newton’s third law of motion
(d) All of these
Answer: (b) Newton’s first law of motion
A particle of mass 0.3 kg is subjected to a force F = -kx with k = 15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin?
(a) 15 m/s²
(b) 3 m/s²
(c) 10 m/s²
(d) 5 m/s²
Answer: (c) 10 m/s²
A jet of water of cross-sectional area ‘a’ strikes a wall at angle θ with the wall and rebounds elastically with the same speed v. If density of water be p, then the normal thrust on the wall will be
(a) av²p sin θ
(b) 2av²p sin θ
(c) 2av²p cos θ
(d) av²p cos θ
Answer: (b) 2av²p sin θ
A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25, then the maximum fraction of the length of the chain that can hang over the edge of the table is
(a) 20%
(b) 25%
(c) 30%
(d) 35%
Answer: (a) 20%
A jet plane flying in atmosphere gets reaction from
(a) gravity
(b) atmosphere
(c) gases ejected by the plane
(d) gravity and atmosphere
Answer: (c) gases ejected by the plane
A bird dismounts on a stretched telegraph wire. The additional tension produced in the wire is
(a) zero
(b) equal to the weight of the bird
(c) greater than the weight of the bird
(d) less than the weight of the bird
Answer: (c) greater than the weight of the bird
A bird is sitting in a wire cage hanging from the spring balance. Let the reading of the spring balance be W1. If the bird flies about inside the cage, the reading of the spring balance becomes W2. Which of the following is true?
(a) W1 > W2
(b) W1 < W2
(c) W1 = W2
(d) None of the above
Answer: (a) W1 > W2
Lubrication reduces friction because
(а) the relative motion is between the liquid and solid
(b) laws of limiting friction are not applicable
(c) lubricant molecules act as ball bearings
(d) none of the above
Answer: (а) the relative motion is between the liquid and solid
A fireman wants to slide down a rope. The breaking load for the rope is 3/4th of the weight of the man. With what minimum acceleration should the fireman slide down? Acceleration due to gravity is g.
(a) g/4
(b) g/2
(c) 3/4 g
(d) zero
Answer: (a) g/4
What is the formula to find linear velocity?
(a)Linear velocity = 2(Mass + Velocity)
(b)Linear velocity = Mass / Velocity
(c)Linear velocity = Mass * Velocity
(d)Linear velocity = Mass – Velocity
Answer: (c)Linear velocity = Mass * Velocity
An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15°. What is the radius of the loop?
(a)15 km
(b)23.567 m
(c)12.781 m
(d)14 km
Answer: (a) 15 km
A cannon after firing recoils due to
(a) conservation of energy
(b) backward thrust of gases produced
(c) Newton’s third law of motion
(d) Newton’s first law of motion
Answer: (c) Newton’s third law of motion
1 Newton = ————–
(a)1 Newton = 1 kg x 1 m/s2
(b)1 Newton = 1 kg
(c)1 Newton = 1 kg x 1 m/s
(d)1 Newton = m/s2
Answer: (a) 1 Newton = 1 kg x 1 m/s2
Swimming is possible on account of
(a) first law of motion
(b) second law of motion
(c) third law of motion
(d) newton’s law of gravitation
Answer: (c) third law of motion
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