Work, Energy and Power Test

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Work, Energy and Power Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

What is the value of 1 kilo watt numerically equivalent to?

A
1000 watt

B
100 watt

C
10 watt

D
5 watt

Solution

1 kilo watt (1 kW) = 1000 watt or 10³ watt
Question 2
1 / -0

Two bodies A and B of equal masses are kept at heights of h units and 2h units respectively. What is the ratio of their potential energies?

A
1 : 2

B
2 : 5

C
2 : 3

D
1 : 3

Solution

Potential energy of the body placed at a height h units = mgh.
Potential energy of the body which is placed at a height 2h units = 2 mgh.
So, the ratio of potential energies of given two bodies = 1 : 2
Question 3
1 / -0

A boy weighing 45 kg jumps vertically upwards from the ground. What will be his kinetic energy at the highest point?

A
0 J

B
500 J

C
700 J

D
400 J

Solution

1/2 mv² is the formula for kinetic energy.
where, m is the mass of the body and v is the velocity with which body is moving.

Since, velocity at the highest point = 0

Therefore, kinetic energy at the highest point = 0 J
Question 4
1 / -0

What is the mathematical expression of Momentum?

A
mv

B
mg

C
mgh

D
mv²

Solution

The product of mass and linear velocity of a body is called linear momentum of the given body.
Momentum is a vector quantity.
Question 5
1 / -0

On what parameter does the escape velocity of a body does not depend?

A
Mass of the body

B
Radius of the body

C
Radius of the earth

D
Mass of the earth

Solution

The value of escape velocity does not depend upon the mass of the projected body.
It depends on the mass and radius of the earth from which it is being projected.
Question 6
1 / -0

What is the value of escape velocity for all the objects projected from earth's surface?

A
11.2 km/s

B
14.6 km/s

C
11.3 km/s

D
11.4 km/s

Solution

The value of escape velocity does not depend upon the mass of the projected body, instead it depends on the mass and radius of the planet from which it is being projected.
The value of escape velocity for objects projected from the earth's surface = 11.2 km/s
Question 7
1 / -0

What is the value of work done when an object of mass 2 kg is raised upto a vertical height of 1 m?

A
1.0 J

B
19.6 J

C
9.8 J

D
980 J

Solution

Work done = mgh
Work done = (2)(9.8)(1)
Work done = 19.6 J
Therefore, 19.6 J is the value of work done for lifting the given object vertically through a distance of 1 metre.

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Re-Attempt Weekly Quiz Competition

Work, Energy and Power Test - 4

Result

Work, Energy and Power Test - 4

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Rank

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SHARING IS CARING

Question 1

1000 watt

100 watt

10 watt

5 watt

Solution

Question 2

1 : 2

2 : 5

2 : 3

1 : 3

Solution

Question 3

0 J

500 J

700 J

400 J

Solution

Question 4

mv

mg

mgh

mv2

Solution

Question 5

Mass of the body

Radius of the body

Radius of the earth

Mass of the earth

Solution

Question 6

11.2 km/s

14.6 km/s

11.3 km/s

11.4 km/s

Solution

Question 7

1.0 J

19.6 J

9.8 J

980 J

Solution

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