Work and Energy Test

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Work and Energy Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

When a body falls freely towards the earth, then its total energy

A
increases

B
decreases

C
remains constant

D
first increases and then decreases

Solution

Correct Option is C.
Explanation for the correct answer:
$$\bullet$$ A freely falling body is free from the non conservative and external forces, thus we can apply Conservation of Energy in such a case.
$$\bullet$$ By Conservation of Energy, the Total Energy of the body remains conserved, that is constant.
$$\bullet$$ As the body falls its Potential Energy starts converting into the Kinetic Energy, and the Total Energy remains same.

Option C is correct.
Question 2
1 / -0

Potential energy of a body depends on its:

A
motion

B
colour

C
mass

D
none of these

Solution

We know that potential energy is the energy possesd by the virtue of its position.
So, $$F = mgh $$
Where, $$ m = $$ mass
So, From above equation we can deduce that potential energy depends on the mass of the substance.
Question 3
1 / -0

Calculate the work done when a $$2\ N$$ force moves a body through a distance of $$10\ m$$.

A
$$10\ J$$

B
$$2\ J$$

C
$$5\ J$$

D
$$20\ J$$

Solution

Given,
Force applied, $$F= 2\ N$$
Distance travelled, $$s = 10\ m$$
We know,
$$Work\ done = Force\ applied \times Distance \ moved$$
$$W = F \times s$$
$$W = 2 \times 10$$
$$W = 20\ J$$
Question 4
1 / -0

Flowing water has the capacity to do work

A
True

B
False

C
Both

D
None

Solution

Flowing water possess kinetic energy which is used to do work.
Question 5
1 / -0

A boy is pushing hard on a wall. Is he doing work?

A
No

B
Can't say

C
May have done some work

D
Yes

Solution

$$\text{Work}=\text{Force}\times \text{Displacement}$$
Here, the wall is not moving although the boy is pushing hard. $$\therefore \text{Displacement}=0$$
$$\therefore \text{Work}=0$$
Question 6
1 / -0

Energy possessed by a body by virtue of its motion is :

A
Potential energy

B
Kinetic energy

C
Chemical energy

D
Electrical energy

Solution

Kinetic energy is defined as the energy possessed by a body by virtue of its motion. and it is equal to $$ K.E. = \cfrac{1}{2}mv^{2} $$ Where $$m$$ and $$v$$ are mass and Velocity of moving body.
Question 7
1 / -0

A student sitting at the top of a tree has ............ than the student who is sitting on the ground.

A
less potential energy

B
more potential energy

C
more kinetic energy

D
more gravitational energy

Solution

Potential energy = $$mgh$$
$$m\rightarrow mass$$
$$g\rightarrow acceleration\ due\ to\ gravity$$
$$h\rightarrow height\ from\ ground$$
P.E. is directly proportional to the height from the ground. Hence a student sitting at the top of a tree has more potential energy than the student who is sitting on the ground.
Question 8
1 / -0

If an object remains stationary even when force is applied then:

A
Work is said to be done

B
Work is not done

C
Work may have been done

D
Work cannot act on that body

Solution

$$\text{Work}=\text{Force}\times \text{Displacement}$$
Work is said to be done only when the body is displaced from its original position by an applied force on it. If the body does not displace then no work is being done even if the force is acting on the body.
Question 9
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

The kinetic energy of a body is the energy by virtue of its motion.
$$ K.E = \dfrac{1}{2}mv^2 $$
where $$m$$ is mass and $$v$$ is velocity.

Hence, Kinetic energy is directly related to the speed of a moving body and its mass.
Question 10
1 / -0

Energy possessed by a body by virtue of its position at a height is :

A
Kinetic energy

B
Chemical energy

C
Potential energy

D
Magnetic energy

Solution

The potential energy of a body is defined as energy possessed by a body by virtue of its position at a height.
$$ P.E = mgh$$
$$m$$: mass of the object
$$g$$ : gravitational acceleration
$$h$$: height gained by object

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Re-Attempt Weekly Quiz Competition

Work and Energy Test - 28

Result

Work and Energy Test - 28

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SHARING IS CARING

Question 1

increases

decreases

remains constant

first increases and then decreases

Solution

Question 2

motion

colour

mass

none of these

Solution

Question 3

$$10\ J$$

$$2\ J$$

$$5\ J$$

$$20\ J$$

Solution

Question 4

True

False

Both

None

Solution

Question 5

No

Can't say

May have done some work

Yes

Solution

Question 6

Potential energy

Kinetic energy

Chemical energy

Electrical energy

Solution

Question 7

less potential energy

more potential energy

more kinetic energy

more gravitational energy

Solution

Question 8

Work is said to be done

Work is not done

Work may have been done

Work cannot act on that body

Solution

Question 9

Kinetic

Potential

Solar

Electric

Solution

Question 10

Kinetic energy

Chemical energy

Potential energy

Magnetic energy

Solution

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