Work and Energy Test

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Work and Energy Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

The work done is dependent on following quantities:

A
Force

B
Mass

C
Distance

D
All of the above

Solution

Work done is given by : $$Work (W) = Force\ applied (F) \times Distance \ traveled \ in \ direction \ of \ force (d) $$
So, $$ W = F \times d $$
where $$ Force(F) = Mass (m) \times Acceleration (a)$$
So, work depends on force, mass, and distance
So, option D is the correct answer
Question 2
1 / -0

Work done =

A
Force $$\times $$ velocity

B
Force $$\times $$ displacement

C
Force $$\times $$ time

D
Power $$\times $$ velocity

Solution

Hint:
Whenever a force $$F$$ acts on a body and that body moves by certain distance because of that force, Work is said to be done by that force on that body.

Correct Option is B.
Explanation for the correct answer:
By definition of work done by any force, If any force $$f$$ acts on any body, and because of that force let body is displaced by displacement $$x$$ in the direction of force, then work done is the product of force with the displacement in the direction of force.
That is,
$$W = f . x$$
Option B is correct.
Question 3
1 / -0

Work done is said to be positive if the applied force and the displacement are in ............ direction.

A
Same

B
Any

C
Opposite

D
Perpendicular

Solution

Work done is positive when the force is in the direction of displacement.
Question 4
1 / -0

When an arrow is released from a bow, potential energy changes into kinetic energy.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

When an arrow is drawn back by a bow, the work done by us in stretching the bowstring gets stored at potential energy in the bow. This potential energy of bow is transformed into kinetic energy when the bowstring is released and this gives kinetic energy to the arrow.
Question 5
1 / -0

According to law of conservation of energy the total energy of the universe is:

A
Increasing

B
Decreasing

C
Remains constant

D
Above law does not say anything about the universe

Solution

Law of conservation of energy states that ''Energy can neither be created nor destroyed'. Hence total energy remains constant for the isolated system. Universe can consider as an isolated system so its total energy will remains same.
Question 6
1 / -0

An object in a given position can have a certain potential energy with respect to one level and a different value of potential energy with respect to another level.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

Potential energy of an object always defined with respect to reference point. If location of reference point changes, there is a possibility that potential at that point would change.
In general, we write the potential energy of an object at a height $$h$$ from earth surface $$U=mgh$$. Here we take earth surface as a zero potential level or reference point.
Hence, Given statement is true. Option A
Question 7
1 / -0

Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. How much work is done by the men in lifting the box? $$(g=10 \:m \:s^{-2})$$

A
2000 J

B
4000 J

C
2500 J

D
1500 J

Solution

Given, mass m = $$250\ kg$$ and height = $$1\ m $$
We know,
Work done$$\ =F.S$$
            $$\ =(m \times g)\times1$$
                  $$\ =250\times10\times1$$
                  $$\ =2500 J$$
Question 8
1 / -0

The gravitational potential energy possessed by a body is by virtue of its _________.

A
position

B
velocity

C
acceleration

D
temperature

Solution

The energy possessed by a body by virtue of its position is called gravitational potential energy
Question 9
1 / -0

According to the law of conservation of energy:

A
Energy exists in only one form.

B
Energy can be created but not be destroyed, and it can be transformed from one form to another.

C
Energy exists in many forms but it cannot be transformed.

D
Energy can neither be produced nor be destroyed and it can be transformed from one form to an-other form.

Solution

According to the law of conservation of energy, energy can neither be produced nor be destroyed and it can be transformed from one form to another.
Question 10
1 / -0

A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process, the potential energy of the car

A
does not change

B
becomes twice of initial

C
becomes 4 times of initial

D
becomes 16 times of initial

Solution

Answer is A.

The potential energy is the energy that an object has due to its position in a force field or that a system has due to the configuration of its parts.
The potential energy of the car remains the same and will not change as the road is leveled and the height of the body remains the same, although its speed increases.

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Re-Attempt Weekly Quiz Competition

Work and Energy Test - 27

Result

Work and Energy Test - 27

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SHARING IS CARING

Question 1

Force

Mass

Distance

All of the above

Solution

Question 2

Force $$\times $$ velocity

Force $$\times $$ displacement

Force $$\times $$ time

Power $$\times $$ velocity

Solution

Question 3

Same

Any

Opposite

Perpendicular

Solution

Question 4

True

False

Ambiguous

Data insufficient

Solution

Question 5

Increasing

Decreasing

Remains constant

Above law does not say anything about the universe

Solution

Question 6

True

False

Ambiguous

Data insufficient

Solution

Question 7

2000 J

4000 J

2500 J

1500 J

Solution

Question 8

position

velocity

acceleration

temperature

Solution

Question 9

Energy exists in only one form.

Energy can be created but not be destroyed, and it can be transformed from one form to another.

Energy exists in many forms but it cannot be transformed.

Energy can neither be produced nor be destroyed and it can be transformed from one form to an-other form.

Solution

Question 10

does not change

becomes twice of initial

becomes 4 times of initial

becomes 16 times of initial

Solution

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