NCERT Solutions for class 11 Physics | Chapter 6 - Work, Energy and Power

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Questions
1 When a Cylinder Filled With Gas is Fitted With a Movable Piston is Allowed to Expand, Then the Work Done by the Gas is Positive. Identify the Statement True or False?
A True
B False

Answer:True
2 The Work Done by the Centripetal Force for a Body Moving in a Circular Path is __________?
A Negative
B Zero
C Constant
D Positive

Answer:Zero
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3 When a Working Coolie Walks on a Horizontal Platform Having a Load on His Head, the Work Done by Him on the Load is Zero. Identify the Statement True or False?
A False
B True

Answer:True
4 A Gardener Pushes a Lawn Roller Via a Distance of 20m. If He Applies a Force of 20kg Weight in a Direction Inclined at 60° to the Ground, Then What Will Be the Work Done by Him? (g=9.8m/s2)
A 400J
B 1960J
C 250J
D 2514J

Answer:1960J
5 The Bullet That Has Fired from a Gun Can Pierce a Target Due to Its __________?
A Heat energy
B Mechanical energy
C Acceleration
D Kinetic energy

Answer:Kinetic energy
6 A truck and car are moving with same Kinetic energies on a straight road.Their engines are simuktanously switched off .Which one will stop at a lesser distance
A Truck
B Car
C Both will stop at the same distance
D Cannot say with the given data

Answer:Truck
7 A body of mass 1 kg is rotating in a circular path of radius 1 m with constant velocity of 5 rev/sec. The work done in one complete revolution is
A 5 J
B 2.5 J
C 12.5 J
D 0

Answer:0
8 A loaf of Bread gives a boy of mass 40kg an energy of 21kJ. If the efficiency is 28% then the height can be climbed by him using this energy is
A 15 m
B 21 m
C 19.5m
D 15.5 m

Answer:15 m
9 If the velocity of the object is increased by 0.1%, then the kinetic energy is increased by
A 0.1 %
B 0.2%
C 0.4%
D 0.01%

Answer:0.2%
10 What is the smallest unit of power?
A Watt
B Kilowatt
C Horse power
D Milliwatt

Answer:Watt
11 A body is falling freely under the action of gravity alone in vacuum.Which of the following quantities remain constant during the fall?
A Kinetic energy.
B Potential energy.
C Total mechanical energy.
D Total linear momentum.

Answer:Total mechanical energy.
12 A body of mass 1 kg travels with a velocity of 10 m/s , this a wall and rebounds . If 50% of its initial energy is wasted as heat , its kinetic energy at the instant of rebounding is
A 20 J
B 60 J
C 50 J
D 25 J

Answer:25 J
13 A miner hauls up a load equal to his own weight from 50 meters depth upto the surface of the mine . The amount of work done by him is
A twice the work he dose in lifting himself up
B half the work he dose in lifting himself up
C Zero
D equal to the work he dose in lifting himself up

Answer:twice the work he dose in lifting himself up
14 A body of mass 100 kg falls from a height of 10 m . Its increase in kinetic energy is
A 9800 J
B 1000 J
C 5000 J
D 3000 J

Answer:9800 J
15 Consider the following two statements A : Linear momentum of a system of particles is zero B : Kinetic energy of a system of particles is zero . Then
A A implies B and B implies A .
B A implies B but B dose not imply A .
C A dose not imply B but B implies A .
D A dose not imply B and B dose not imply A .

Answer:A dose not imply B but B implies A .
16 A quantity of work of 1000 J is done in 2 seconds . The power utilised is
A 998 W
B 1002 W
C 2000 W
D 500 W

Answer:500 W
17 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

Answer:3.6 J
18 A small spherical ball is gently dropped from the rim of a hemispherical bowl with a smooth surface . The ball will
A rise up to the opposite rim of the bowl after reaching the bottom
B stop at the bottom of the bowl
C rise halfway up the bowl after reaching the bottom
D shoot out of the bowl through the opposite rim of the bowl

Answer:rise up to the opposite rim of the bowl after reaching the bottom
19 A body of mass m moving with a velocity of 10 m/s makes an elastic collision with another body of same mass initially at rest . The first body comes at rest after the collision . Then the second mass will travel with a velocity of
A 10 m/s
B 5 m/s
C 20 m/s
D 15 m/s

Answer:10 m/s
20 During inelastic collision between two bodies, which of the following quantities always remain conserved?
A Total kinetic energy.
B Total mechanical energy.
C Total linear momentum.
D Speed of each body

Answer:Total linear momentum.

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