Which of the following statements are correct about power?

1. It is the rate of change of momentum.
2. It is the rate of change of force.
3. It is the rate of doing work.
4. The S.I. unit of power is watt.

Only 2 and 4

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Only 1 and 4

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Only 3 and 4

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Only 1, 3 and 4

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Solution

The correct option is C
Only 3 and 4

Power is defined as the rate of doing work.
Mathematically power is expressed as $P o w e r = \frac{W o r k d o n e}{T i m e t a k e n}$
The S.I. unit of power is joule per second, which is equal to watt. So, only statements 3 and 4 are true.

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Similar questions

Which of the following statement(s) is/are correct about power?

1. It is the rate of change of force.
2. It is the rate of doing work.
3. The S.I. unit of power is watt.

Q. If the rate of change of volume of a sphere is equal to the rate of change of its radius, then its radius is equal to

(a) 1 unit

(b)

\sqrt{2 π} units

(c)

\frac{1}{\sqrt{2 π}} unit

(d)

\frac{1}{2 \sqrt{π}} unit

Force is equal to the rate of change of momentum.

Q. The rate of doing work is called power.

Q. If the rate of change of area of a circle is equal to the rate of change of its diameter, then its radius is equal to
(a)

\frac{2}{π} unit

(b)

\frac{1}{π} unit

(c)

\frac{π}{2} units

(d) π units

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Which of the following statements are correct about power? 1. It is the rate of change of momentum. 2. It is the rate of change of force. 3. It is the rate of doing work. 4. The S.I. unit of power is watt.

The correct option is C Only 3 and 4 Power is defined as the rate of doing work. Mathematically power is expressed as Power=Work doneTime taken The S.I. unit of power is joule per second, which is equal to watt. So, only statements 3 and 4 are true.

Which of the following statements are correct about power?

1. It is the rate of change of momentum.
2. It is the rate of change of force.
3. It is the rate of doing work.
4. The S.I. unit of power is watt.

The correct option is C
Only 3 and 4

Power is defined as the rate of doing work.
Mathematically power is expressed as $P o w e r = \frac{W o r k d o n e}{T i m e t a k e n}$
The S.I. unit of power is joule per second, which is equal to watt. So, only statements 3 and 4 are true.