Work and Energy Test

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Work and Energy Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

P. E of your body is maximum when you

A
are sitting on the chair

B
are sitting on the ground

C
lie down on the ground

D
are standing

Solution

Potential energy of body depends on how far the object is from the centre of earth within the sphere of gravitational influence. Technically, Potential energy equals to the product of weight of the object and its distance from centre of earth. If you stand up, your centre of gravity is brought up. Which will increase your distance from the centre of earth(not significantly though). So the potential energy possessed by your body will be more if you’re standing than sitting on the ground or lying on the ground.
Question 2
1 / -0

Statement A: An aeroplane flying at an altitude possesses only K. E.
Statement B: An aeroplane flying at an altitude possesses both K. E and P. E.
Which of the two statement is true

A
statement A

B
statement B

C
both a and b

D
neither a nor b

Solution

The areoplane has both kinetic energy and potential energy. When it is in flight it will fly above the ground so it is displaced by certain distance and hence it posses potential energy. As it is in motion it posses kinetic energy.
Question 3
1 / -0

Find the incorrect statement

A
the P. E of a freely falling object increases progressively

B
there is no transfer of energy between you and the rock when you push a huge rack and fail to move it

C
body at rest may possess energy

D
K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the ground

Solution

When an object starts to fall freely, the K.E. increase with decrease in potential energy and total mechanical energy remains constant. So given statment is incorrect.
Question 4
1 / -0

When you compress a coil spring you do work on it. The elastic P. E energy

A
increase

B
decreases

C
disappears

D
remains unchanged

Solution

The work done by you will be stored in the form of electric potential energy. So, when you compress a coil spring you do work on it then the elastic P. E energy increase.
Question 5
1 / -0

P.E of a spring increases when it is in the state of

A
expansion

B
compression

C
both compression and expansion

D
neither compression nor expansion

Solution

Potential energy of a spring increases when it is in the state of expansion and compression. Elastic potential energy increases with compression and gravitational potential energy increases on expansion.
Question 6
1 / -0

What happens to the kinetic energy of a freely falling object which eventually stops on reaching the ground?

A
It changes in vibration energy

B
It changes into electric energy

C
It changes into light energy

D
It changes into heat & sound energy

Solution

When a freely falling body eventually stops on reaching the ground, its kinetic energy appears in the from of: (i) heat (the body and the ground become warmer due to collision). (ii) sound (produced due to collision of the body with the ground).
Question 7
1 / -0

Statement A: Speed of a gas molecules decreases with increase in temperature
Statement B: P. E of the body decreases as it falls towards the surface of the Earth.
Which of the two statements is true?

A
statement A

B
statement B

C
both statement A and B

D
statement A and B are false

Solution

The average kinetic energy of a gas particle is directly proportional to the temperature. An increase in temperature increases the speed in which the gas molecules move. So statement A is false statement.
As the body falls from height h, its potential energy decreases while the kinetic energy begins to increase; the total mechanical energy at any point being the same i.e. m g h. So, statement B is true statement.
Question 8
1 / -0

Match the following with correct response.
(1) K.E
(2) P.E
(3) P
(4) E

(A) mgh
(B) P × t
(C) w / t
(D) 1/2mv²

A
1-C, 2-B, 3-D, 4-A

B
1-A, 2-C, 3-B, 4-D

C
1-D, 2-A, 3-C, 4-B

D
1-B, 2-D, 3-A, 4-C

Solution

(1) Kinetic energy is the energy of motion. KE = 1/2 mv²
(2) Energy possessed by an object because of its position is called potential energy. P.E. = mgh
(3) Rate of doing work is called power. P = w/t
(4) Energy = Power × time , E = P × t
Question 9
1 / -0

Match the following with correct response.
(1) Bullet fired from gun
(2) A flying bird
(3) In a falling stone
(4) Water at dam

(A) Potential energy changes to kinetic energy
(B) Kinetic energy
(C) Potential energy
(D) Kinetic & Potential energy

A
1-B, 2-D, 3-A, 4-C

B
1-D, 2-A, 3-C, 4-B

C
1-C, 2-B, 3-D, 4-A

D
1-A, 2-C, 3-B, 4-D

Solution

(1) Bullet fired from gun is kinetic energy because Kinetic energy is the energy of motion.
(2) A flying bird is depend on motion and position also so its example of optional and kinetic energy.
(3) In a falling stone potential energy changes to kinetic energy
(4) Water at dam stored in particular position so, it’s a example of potential energy.

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Work and Energy Test - 8

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Work and Energy Test - 8

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SHARING IS CARING

Question 1

are sitting on the chair

are sitting on the ground

lie down on the ground

are standing

Solution

Question 2

statement A

statement B

both a and b

neither a nor b

Solution

Question 3

the P. E of a freely falling object increases progressively

there is no transfer of energy between you and the rock when you push a huge rack and fail to move it

body at rest may possess energy

K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the ground

Solution

Question 4

increase

decreases

disappears

remains unchanged

Solution

Question 5

expansion

compression

both compression and expansion

neither compression nor expansion

Solution

Question 6

It changes in vibration energy

It changes into electric energy

It changes into light energy

It changes into heat & sound energy

Solution

Question 7

statement A

statement B

both statement A and B

statement A and B are false

Solution

Question 8

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

Question 9

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

Solution

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