Work And Energy Test

Result

Work And Energy Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following devices does not come under the category of lever?

A
Crowbar

B
A pair of scissors

C
Broom

D
Staircase

Solution

Staircase does not come under the category of lever as it does not have a bar and a fulcrum.\
Question 2
1 / -0

Find the mechanical advantage of a machine, which has a velocity ratio as 3.2 and efficiency as 75%.

A
2.4

B
3.6

C
2.8

D
3.9

Solution

Mechanical advantage is simply the product of velocity ratio and the efficiency.
Thus, for the given case, mechanical advantage = 3.2 x 0.75 = 2.4.
Question 3
1 / -0

The temperature of water at the bottom of a waterfall is higher than that of the water at the top because

A
falling water absorbs heat from the sun

B
kinetic energy of the falling water is converted into heat

C
water at the bottom has greater potential energy

D
the rocks on the river bed give out heat

Solution

As the water falls through a height, its PE is converted into KE.
Now, kinetic energy on falling is converted into heat.
Question 4
1 / -0

Sound energy is converted into electrical energy in a

A
loudspeaker

B
microphone

C
sonometer

D
earphone

Solution

Microphone converts sound energy into electrical energy.
Question 5
1 / -0

When a spring is wound, a certain amount of PE is stored in it. If this wound spring is dissolved in acid, the stored energy

A
is completely lost

B
appears in the form of electromagnetic waves

C
appears in the form of heat and raising the temperature of the acid

D
appears in the form of KE by splashing acid drops

Solution

If the wound spring is dissolved in acid then the stored energy appears in the form of heat and it raises the temperature of the acid.
Question 6
1 / -0

The spring of the winding knob of a watch has

A
mechanical energy

B
only kinetic energy

C
only potential energy

D
kinetic or potential energy

Solution

The spring has stored potential energy which is converted into kinetic energy. Therefore, we can say that the spring of the winding knob of a watch has only potential energy.

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Re-Attempt Weekly Quiz Competition

Work And Energy Test - 4

Result

Work And Energy Test - 4

Score

-

Rank

-

SHARING IS CARING

Question 1

Crowbar

A pair of scissors

Broom

Staircase

Solution

Question 2

2.4

3.6

2.8

3.9

Solution

Question 3

falling water absorbs heat from the sun

kinetic energy of the falling water is converted into heat

water at the bottom has greater potential energy

the rocks on the river bed give out heat

Solution

Question 4

loudspeaker

microphone

sonometer

earphone

Solution

Question 5

is completely lost

appears in the form of electromagnetic waves

appears in the form of heat and raising the temperature of the acid

appears in the form of KE by splashing acid drops

Solution

Question 6

mechanical energy

only kinetic energy

only potential energy

kinetic or potential energy

Solution

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Question Analysis

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