Work and Energy Test

Result

Work and Energy Test - 29

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Question 1
1 / -0

A heavy object has ---- potential energy than a lighter one

A
Less

B
More

C
Same

D
None of these

Solution

$$P.E= mgh$$
The amount of potential energy an object possesses depends on its height and mass. The heavier the object and the higher from the ground, the more potential energy it holds.
Question 2
1 / -0

Two weights of 5 kg and 10 kg are placed on a horizontal table of height 1.5 m. Which will have more potential energy?

A
5 kg

B
10 kg

C
Both will have equal energy

D
None of the above

Solution

We know that , P.E $$ = mgh $$
So, It is directly proportional to height and mass.
Since both the weights are at the same height, so the weight with a larger mass will have more potential energy.
Since $$10$$kg object has a larger mass than a $$5$$ kg,
so, the potential energy of a $$10$$kg mass will be greater.
Question 3
1 / -0

Which one of the following possesses potential energy?

A
Moving vehicle on the road

B
A running athlete

C
Stone on the road

D
A stretched rubber band

Solution

Moving vehicle on the road possesses kinetic energy.

A running athlete possesses kinetic energy.

Stone on the road possesses kinetic energy.

A stretched rubber band possesses potential energy.

Hence, option D is correct.
Question 4
1 / -0

An overhead tank having some water possesses .......... energy.

A
Kinetic

B
Potential

C
Thermal

D
Electrical

Solution

We know that Potential energy is the energy possessed by a body by the virtue of its position.
$$\therefore$$ An overhead tank having some water possesses Potential energy, as it is at a height.
Question 5
1 / -0

Potential energy is directly proportional to:

A
velocity of the body

B
speed of the body

C
height of the body from the surface

D
shape of the body

Solution

Gravitational potential energy = Mgh
therefore it is directly proportional to the height of the body from the surface.
Question 6
1 / -0

Which of the following does has kinetic energy ?

A
An inflated balloon

B
Water in a flowing river

C
A fruit on the tree

D
A stationary plane

Solution

An object which has velocity with respect to the observer has Kinetic Energy.
therefore, B is the correct answer.
Question 7
1 / -0

Which of the following possesses kinetic energy?

A
A fallen tree

B
Running athlete

C
Wound watch spring

D
Boy standing on the road

Solution

Kinetic energy is the energy possessed by an object due to its motion.
Thus, B is the answer.
Question 8
1 / -0

A box of mass $$1\ kg$$ is pulled on a horizontal plane of length $$1\ m$$ by a force of $$8\ N$$ then it is raised vertically to a height of $$2$$ m, the net work done is:

A
28 J

B
8 J

C
18 J

D
none of the above

Solution

$$W=mgh+FS=1(10)(2)+8\times 1=20+8=28J$$
Question 9
1 / -0

What is the unit of energy in food ?

A
$$Kilo$$ $$calorie$$

B
$$Erg$$

C
$$Joule$$

D
$$Calorie$$

Solution

The energy stored in food is measured in $$kilo$$ $$calories$$.This is the unit of energy in food.
Where
$$1kilo$$ $$calorie=4184Joules$$
Question 10
1 / -0

The form of energy present in a wound spring is:

A
chemical

B
heat energy

C
magnetic

D
mechanical

Solution

Potential energy is stored in a wound spring. Potential energy is a type of mechanical energy. Hence, energy present in a wound spring is mechanical energy.

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Re-Attempt Weekly Quiz Competition

Work and Energy Test - 29

Result

Work and Energy Test - 29

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-

Rank

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SHARING IS CARING

Question 1

Less

More

Same

None of these

Solution

Question 2

5 kg

10 kg

Both will have equal energy

None of the above

Solution

Question 3

Moving vehicle on the road

A running athlete

Stone on the road

A stretched rubber band

Solution

Question 4

Kinetic

Potential

Thermal

Electrical

Solution

Question 5

velocity of the body

speed of the body

height of the body from the surface

shape of the body

Solution

Question 6

An inflated balloon

Water in a flowing river

A fruit on the tree

A stationary plane

Solution

Question 7

A fallen tree

Running athlete

Wound watch spring

Boy standing on the road

Solution

Question 8

28 J

8 J

18 J

none of the above

Solution

Question 9

$$Kilo$$ $$calorie$$

$$Erg$$

$$Joule$$

$$Calorie$$

Solution

Question 10

chemical

heat energy

magnetic

mechanical

Solution

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