Power and Work Quiz

Rate of doing work is called?

• Energy

• Velocity

• Power

• Force

Answer explanation

The rate of doing work is defined as power. It quantifies how quickly work is done or energy is transferred, making 'power' the correct answer among the options provided.

Rate of doing work is called?

• Energy

• Power

• Pressure

• Force

Answer explanation

The rate of doing work is defined as power. It measures how quickly work is done or energy is transferred. Energy refers to the capacity to do work, while power quantifies that work over time.

If a man do 'W' work in 't' time, then his power 'P' will be-

• t-W

• t×W

• W/t

• t/W

Answer explanation

Power 'P' is defined as the work done 'W' divided by the time 't' taken to do that work. Therefore, if a man does 'W' work in 't' time, his power 'P' will be W/t, making 'W/t' the correct choice.

What is the formula for power–

• Work/Time

• Time/Area

• Work × Time

• Time/Work

Answer explanation

The formula for power is defined as the amount of work done per unit of time. Therefore, the correct choice is Work/Time, which quantifies how quickly work is performed.

If an agent doing 'W' works in time 't', then his power will be –

• W×t

• W+t

• t/W

• W/t

Answer explanation

Power is defined as the work done per unit time. Therefore, if an agent does 'W' work in time 't', his power is calculated as W/t, making this the correct choice.

Formula of power is -

• Momentum/time

• Work/time

• Speed/time

• Displacement/time

Answer explanation

The formula for power is defined as the rate at which work is done. Therefore, power is calculated as work divided by time, making 'Work/time' the correct choice.

Which of the following physical quantity measures the rate of work done?

• Power

• momentum

• Force

• Energy

Answer explanation

Power measures the rate at which work is done or energy is transferred over time. It is defined as work done per unit time, making it the correct choice for measuring the rate of work done.

Power= W/T, what is the meaning of W ?

• Power

• Weight

• Watt

• Work done

Answer explanation

In the formula Power = W/T, W represents 'Work done'. This indicates the amount of energy transferred or converted in a process, making 'Work done' the correct choice among the options.

Which of the following physical quantity measure the rate of work ?

• Force

• Velocity

• Energy

• Power

Answer explanation

Power measures the rate at which work is done or energy is transferred over time. It quantifies how quickly work is performed, making it the correct choice among the options provided.

Mohan having a mass of 40 kg. He climbs 50 steps of a staircase in 10s. If the height of each step is 15cm then what is his power? (g = 10 m/s2)

• 200W

• 400W

• 300W

• 100W

Answer explanation

Mohan's work done is mgh = 40kg * 10m/s² * 7.5m = 3000J. Power = Work/Time = 3000J/10s = 300W. Thus, the correct answer is 300W.