# Class 11 Physics MCQs Work, Energy And Power for JEE/NEET

Here, you will get Class 11 Physics MCQ of Chapter 6 Work, Energy And Power for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 11 Physics Chapter 6 Work, Energy And Power, 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.

## Work, Energy And Power Class 11 MCQs Questions with Answers

A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platfrom from where the took the jump the total work done by the man at the instant he lands is
(a) 300 J
(b) 150 J
(c) 600 J
(d) zero

A solid cylinder of length 1 m and diameter of cross section y 100 cms is first placed with its axis vertical its then slowly inclined till its axis is horizontal. The loss in its potential energy if the mass of the cylinder is 10 kg is
(a) 5g J
(b) 10g J
(c) Zero
(d) 8g J

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?
(a) 7.2 J
(b) 3.6 J
(c) 120 J
(d) 1200 J

An electric heater of rating 1000 W is used for 5 hrs per day for 20 days. The electrical energy utilised is
(a) 150 kWh
(b) 200 kWh
(c) 100 kWh
(d) 300 kWh

An isolated particle of mass m is moving in a horizontal plane (x-y), along the x-axis, at a certain height above the ground. It suddenly explodes into two fragments of masses m/4 and 3m/4 . An instant later, the smaller fragment is at y = + 15 cm. The larger fragment at this instant is at
(a) y = -5 cm
(b) y = +20 cm
(c) y = +5 cm
(d) y = -20 cm

Answer: (a) y = -5 cm

When the force retards the motion of body, the work done is
(a) zero
(b) negative
(c) positive
(d) Positive or negative depending upon the magnitude of force and displacement

A boy carrying a box on his head is walking on a level road from one place to another is doing no work. This statement is
(a) correct
(b) incorrect
(c) partly correct
(d) cannot say

A light and a heavy body have equal momentum. Which one has greater K.E.?
(a) The lighter body
(b) The heavier body
(c) Both have equal K.E.
(d) Data given is incomplete

A bullet is fired and gets embedded in block kept on table. If table is frictionless, then
(a) kinetic energy gets conserved
(b) potential energy gets conserved
(c) momentum gets conserved
(d) both (a) and (c)

When two spheres of equal masses undergo glancing elastic collision with one of them at rest, after collision they will move
(a) opposite to one another
(b) in the same direction
(c) together
(d) at right angle to each other

Answer: (d) at right angle to each other

A pump delivers water at the rate of V cubic meter per second. By what factor its power should be raised so that it delivers water at the rate of nV cubic metre per second.
(a) n³
(b) √n
(c) n
(d) n²

Work done by a conservative force is positive if
(a) P.E. of the body decreases
(b) K.E. of the body increases
(c) K.E. of the body decreases
(d) P.E. of the body increases

Answer: (a) P.E. of the body decreases

The engine of a vehicle delivers constant power. If the vehicle is moving up the inclined plane then, its velocity
(a) must remain constant
(b) must increase
(c) must decrease
(d) may increase, decrease or remain same

Two masses 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is
(i) 4 : 1
(b) 0 : 1
(c) 1 : 2
(d) 1 : 6

A light and a heavy body have equal momentum. Which one has greater K.E.?
(a) The lighter body
(b) The heavier body
(c) Both have equal K.E.
(d) Data given is incomplete

A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is
(a)Negative
(b)0
(c)Positive
(d)None of the option

State true or false: According to Equivalence of Mass and Energy, it states that mass and energy are NOT interconvertible.
(a)True
(b)False

Collision between marble balls is which type of collision?
(a)Inelastic Collision
(b)Elastic Collision
(c)Destructive collision
(d)None of the options

Four particles given, have same momentum. Which has maximum kinetic energy
(a) Proton
(b) Electron
(c) Deutron
(d) Alpha-particles

The speed of an object of mass m dropped from an inclined plane (frictionless), at the bottom of the plane, depends on:
(a) height of the plane above the ground
(b) angle of inclination of the plane
(c) mass of the object
(d) All of these

Answer: (a) height of the plane above the ground

When the linear momentum of a particle is increased by 1% its kinetic energy increases by x%. When the kinetic energy of the particle is increased by 300%, its linear momentum increases by y%. The ratio of y to x is
(a) 300
(b) 150
(c) 100
(d) 50

A marble moving with some velocity collides perfectly elastically head-on with another marble at rest having mass 1.5 times the mass of the colliding marble. The percentage of kinetic energy by the colliding marble after the collision is
(a) 4
(b) 25
(c) 44
(d) 67

A ball is dropped from a height of 1 m. If the coefficient of restitution between the surface and ball is 0.6, the ball rebounds to a height of
(a) 0.6 m
(b) 0.4 m
(c) 1 m
(d) 0.36 m

A man pushes a wall and fails to displace it, he does
(a) negative work
(b) positive but not maximum work
(c) no work at all
(d) maximum positive work

Answer: (c) no work at all

The temperature at the bottom of a high water fall is higher than that at the top because
(a) by itself heat flows from higher to lower temperature
(b) the difference in height causes a difference in pressure
(c) thermal energy is transformed into mechanical energy
(d) mechanical energy is transformed into thermal energy

Answer: (d) mechanical energy is transformed into thermal energy

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