Work, Energy and Power Test

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Work, Energy and Power Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

What is the formula for finding the kinetic energy of a moving object?

A
1/2 mv²

B
mgh

C
1/2 vm²

D
1/2 v²

Solution

1/2 mv² is the formula for kinetic energy where m is the mass of the body and v is the velocity with which body/object is moving.
Question 2
1 / -0

Photography, photosynthesis and photoelectric effect are related to which of the following forms of energy?

A
Heat energy

B
Sound energy

C
Light energy

D
Electrical energy

Solution

Photography, photosynthesis and photoelectric effect are related to light energy.
Question 3
1 / -0

What is the frequency range of audible sound?

A
20 to 60,000 hertz

B
40 to 20,000 hertz

C
20 to 20,000 hertz

D
290 to 29,000 hertz

Solution

Standard range of audible frequencies is 20 to 20,000 Hz, although the range of frequencies the individuals hear is greatly influenced by environmental factors.
Question 4
1 / -0

What is the term used for conversion of energy from one form to another?

A
Transformation of energy

B
Conservation of energy

C
Dissipation of enegy

D
Retention of energy

Solution

Transformation of energy is used for conversion of energy from one form to another.
Question 5
1 / -0

If the speed of a moving body is doubled, what will be the change in the kinetic energy of the given body?

A
2 times

B
4 times

C
8 times

D
No change

Solution

Kinetic energy = 1/2 mv² where, 'm' is the mass of the body and 'v' is the velocity with which body is moving.
When v is changed to 2v then value of new kinetic energy becomes 4 times the original kinetic energy as square of velocity is present in the formula.
Question 6
1 / -0

If the speed of a body is halved, what is the change in its kinetic energy?

A
1/4 th

B
1/8 th

C
1/16 th

D
None of these

Solution

1/2 mv² is the formula for kinetic energy where m is the mass of the body and V is the velocity with which body is moving. When v is changed to v/2, then the new value of kinetic energy becomes 1/4 ^th of the original kinetic energy.
Question 7
1 / -0

What is the kinetic energy of a body of 1 kg moving at the speed of 2 m/s?

A
4 J

B
3 J

C
2 J

D
1 J

Solution

1/2 mv² is the formula for kinetic energy
where 'm' is the mass of the body and 'V' is the velocity with which body is moving.

Here, m = 1 kg and v = 2 m/s.
So, kinetic energy = 1/2 (1) (2)²
= 2 J
Question 8
1 / -0

What s the SI unit of power?

A
watt

B
joule

C
ampere

D
volt

Solution

SI unit of power is watt which is equal to the time rate of doing one joule of work.
Question 9
1 / -0

What is equivalent value of 1 horse power in watts?

A
746 w

B
742 w

C
346 w

D
234 w

Solution

One horsepower is equal to 745.69 watts.
Or 1 hp (I) = 746 W

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Work, Energy and Power Test - 3

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Work, Energy and Power Test - 3

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SHARING IS CARING

Question 1

1/2 mv2

mgh

1/2 vm2

1/2 v2

Solution

Question 2

Heat energy

Sound energy

Light energy

Electrical energy

Solution

Question 3

20 to 60,000 hertz

40 to 20,000 hertz

20 to 20,000 hertz

290 to 29,000 hertz

Solution

Question 4

Transformation of energy

Conservation of energy

Dissipation of enegy

Retention of energy

Solution

Question 5

2 times

4 times

8 times

No change

Solution

Question 6

1/4 th

1/8 th

1/16 th

None of these

Solution

Question 7

4 J

3 J

2 J

1 J

Solution

Question 8

watt

joule

ampere

volt

Solution

Question 9

746 w

742 w

346 w

234 w

Solution

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1/2 mv²

1/2 vm²

1/2 v²