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Free download in PDF Class 11 Physics Chapter 6 Work, Energy and Power Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(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?
(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
(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?
(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
(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
(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
(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
(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
(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%
(10)
What is the smallest unit of power?
[A]
Watt
[B]
Kilowatt
[C]
Horse power
[D]
Milliwatt
(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
(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
(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
(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
(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
(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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