Work and Energy Test

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Work and Energy Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

------ is done when you push a box.

A
Displacement

B
Motion

C
Work

D
Speed

Solution

When we push a box, a force is applied. Since the box is moving, some work is done on the box. (As $$Work=(force)\times (displacement)$$
Question 2
1 / -0

Potential energy increases :

A
As the height increases

B
As the mass decreases

C
As the velocity increases

D
None of the above

Solution

Potential energy of an object of mass $$m$$ at height $$h$$, $$ P.E = mgh$$
$$\implies P.E \propto h$$

Therefore, potential energy increases as the height increases.
Question 3
1 / -0

When an aeroplane takes off from the ground :

A
Kinetic energy increases and Potential energy decreases

B
Potential energy increases and Kinetic energy remains constant

C
Both Kinetic energy and Potential energy remain constant

D
Both Kinetic energy and Potential energy increase

Solution

Kinetic energy is due to the motion of the object and potential energy is due to relative elevation.
So as the plane takes off height increases and also its speed increase, so both kinetic and potential energy increases.
$$\text{Kinetic energy} = \dfrac{1}{2}mv^2$$
$$\text{Potential energy} = mgH$$
Question 4
1 / -0

Which of the following is an example of an object with Kinetic energy?

A
Boy running on field

B
Bent bow

C
Stone at a height

D
Water stored in a reservoir

Solution

kinetic energy is energy possessed by body due to virtue of its motion.
only boy in option A is in motion so only he has some kinetic energy.
rest option have things at rest so no kinetic energy.
so option A is the answer.
Question 5
1 / -0

Find the potential energy if a body is placed at a certain height of 5 m from the earth.

A
196 J

B
200 J

C
150 J

D
300 J

E
None of these

Solution
Question 6
1 / -0

The water stored in a reservoir possesses :

A
Kinetic energy

B
Muscular energy

C
Potential energy

D
Magnetic energy

Solution

Potential energy is the energy possessed due to the relative position of one body with respect to other.
Kinetic energy is the energy possessed due to the motion of the body.
Water stored in the reservoir is at rest, so no kinetic energy but it is at some height with respect to some level below the water surface, so it contains potential energy.
Question 7
1 / -0

A boy held a book of 1 kg at a height of 1 metre for 60 seconds. Calculate the work done :

A
60 J

B
30 J

C
15 J

D
0

Solution

$$work done = force\times displacement$$
Since the object did not move that means displacement is zero so work done is not considered to be done. Work done by the boy will be zero
Question 8
1 / -0

While running you possess certain kind of energy due to motion .What kind of energy do you possess?

A
Potential energy

B
Kinetic energy

C
Electrical energy

D
Chemical energy

E
None of these

Solution

The energy possessed by the virtue of motion of any object is called kinetic energy.Hence while running the energy possessed by the person is kinetic energy.
Question 9
1 / -0

Kinetic energy of a body depends on its:

A
Position

B
Velocity

C
Shape

D
Colour

Solution

$$K.E.=\dfrac{1}{2} mv^2$$

So the kinetic energy of a body depends upon its mass and velocity.
Question 10
1 / -0

A force, applied on a body, is said to have done some work

A
If the body suffers no displacement

B
If the body suffers a displacement

C
If the shape of the body changes

D
If the size of the body changes

Solution

A force, applied on a body, is said to have done some work if the body suffers a displacement. This is according to the definition of work.
$$\text{work = Force} \times \text{displacement}$$

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Re-Attempt Weekly Quiz Competition

Work and Energy Test - 36

Result

Work and Energy Test - 36

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SHARING IS CARING

Question 1

Displacement

Motion

Work

Speed

Solution

Question 2

As the height increases

As the mass decreases

As the velocity increases

None of the above

Solution

Question 3

Kinetic energy increases and Potential energy decreases

Potential energy increases and Kinetic energy remains constant

Both Kinetic energy and Potential energy remain constant

Both Kinetic energy and Potential energy increase

Solution

Question 4

Boy running on field

Bent bow

Stone at a height

Water stored in a reservoir

Solution

Question 5

196 J

200 J

150 J

300 J

None of these

Solution

Question 6

Kinetic energy

Muscular energy

Potential energy

Magnetic energy

Solution

Question 7

60 J

30 J

15 J

0

Solution

Question 8

Potential energy

Kinetic energy

Electrical energy

Chemical energy

None of these

Solution

Question 9

Position

Velocity

Shape

Colour

Solution

Question 10

If the body suffers no displacement

If the body suffers a displacement

If the shape of the body changes

If the size of the body changes

Solution

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