Work Energy and Power Test

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Work Energy and Power Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

A raised hammer possesses :

A
K.E.

B
P.E.

C
electrical energy

D
sound energy

Solution

A raised hammer possesses P.E
Energy possessed by a body by virtue of its position is called as potential energy. Similarly is the case when a hammer is raised. A raised hammer possesses potential energy by virtue of its height above ground level.
Question 2
1 / -0

Two bodies of equal weight are kept at heights of h and 1.5 h respectively. The ratio of their P.E. will be :

A
3: 2

B
2: 3

C
1: 1

D
none of these

Solution

$$\underline{\text{First body:}}$$
Mass of the body = $$m$$
Height at which the body is kept = $$h$$
Potential energy of the body $$U_1=mgh$$

$$\underline{\text{Second body:}}$$
Mass of the body = $$m$$
Height at which the body is kept = $$1.5h$$
Potential energy of the body $$U_2=1.5mgh$$

The ratio of potential energy is $$U_1:U_2=1:1.5=\dfrac{2}{3}=2:3$$
Question 3
1 / -0

Which of the following is not a perfectly inelastic collision ?

A
Striking of two glass balls

B
A bullet striking a bag of sand

C
An electron captured by a proton

D
A man jumping into a moving cart

Solution

In case of perfectly inelastic collision, the two bodies move together with same velocity. A bullet striking the bag of sand, capturing of electron by a proton and a man jumping into the moving cart are the examples of perfectly inelastic collision whereas striking of two glass balls is an example of elastic collision.
Question 4
1 / -0

Directions For Questions

A porter is carrying a load of 50 kg.

...view full instructions

(i) What is the work done by the porter when he climbs up a height of 10 m $$\displaystyle (g\quad = 10\ {ms} ^{-2})$$?

A
$$5kJ^2$$

B
$$50kJ$$

C
$$100kJ^2$$

D
$$5kJ$$

Solution

The work done by the potter is defined as the product of the force and the displacement.

Work done = force $$\times$$ displacement
= $$m \times g \times 10$$ ( Since force = mass $$\times$$ gravity)

= $$50 \times 10 \times 10$$
= $$5KJ$$
Question 5
1 / -0

Which one of the following types of energy is possessed by a body when placed at a certain height?

A
Kinetic energy

B
Potential energy

C
Heat energy

D
Sound energy

E
None of these

Solution

When a body is placed at a certain height, the body possesses potential energy.

$$P.E. = mgH$$
$$m$$; the mass of the object
$$g$$; acceleration due to gravity
$$H$$; height gained by object
Question 6
1 / -0

A heavy object has ....... gravitational potential energy than a lighter one.

A
less

B
more

C
same

D
none of these

Solution

Gravitational potential energy is given by
$$PE=mgh$$
where $$m$$ is mass so heavy object means more mass and more mass means more potential energy.
Question 7
1 / -0

The energy directly related to the speed of a moving body and its mass is:

A
kinetic

B
potential

C
solar

D
electric

Solution
Question 8
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 9
1 / -0

Which of the following does not have potential energy ?

A
An inflated balloon

B
Water in a flowing river

C
A fruit on the tree

D
A spinning top

Solution

Potential energy is the energy that is stored in an object due to its position above the ground surface and when the object is in motion then it has kinetic energy. Water in a flowing river has kinetic energy.
Question 10
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

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Re-Attempt Weekly Quiz Competition

Work Energy and Power Test - 34

Result

Work Energy and Power Test - 34

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SHARING IS CARING

Question 1

K.E.

P.E.

electrical energy

sound energy

Solution

Question 2

3: 2

2: 3

1: 1

none of these

Solution

Question 3

Striking of two glass balls

A bullet striking a bag of sand

An electron captured by a proton

A man jumping into a moving cart

Solution

Question 4

$$5kJ^2$$

$$50kJ$$

$$100kJ^2$$

$$5kJ$$

Solution

Question 5

Kinetic energy

Potential energy

Heat energy

Sound energy

None of these

Solution

Question 6

less

more

same

none of these

Solution

Question 7

kinetic

potential

solar

electric

Solution

Question 8

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 9

An inflated balloon

Water in a flowing river

A fruit on the tree

A spinning top

Solution

Question 10

196 J

200 J

150 J

300 J

None of these

Solution

User

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