Match the following with the correct response:

List I List II

1. W A. Nm

2. kW B. 3.6 × 106 J

3. 1 kW.h C. 1000 W

4. 1 HP D. 746 W

Question

Question

This question was previously asked in

RRB ALP CBT I 31 Aug 2018 Shift 1 Official Paper

Answer 1

The correct answer is 1 - A, 2 - C, 3 - B, 4 - D

Key Points

Work is when a body is displaced by a distance on applying force or work done by a force on an object is equal to the magnitude of a force multiplied by the distance moved in the direction of a force.
- Distance is represented by s and Force by F.
- So, Work (W) is given by W = F.s.
- SI unit of work is N-m or Joule and CGS unit is erg. 1 joule = 10 7 erg.
Work is a scalar quantity i.e., it only has magnitude but not direction.
Power is the rate of work done by the body and is given by \(\mathbf P={\frac{Work}{Time}}\) where the SI unit of power is a watt (W) or kW (1000 W).
- It is also measured in Horsepower and 1 HP = 746 W.
- Work/Energy is measured in joule (J) and 1 kWh = 3.6x10 6 joule. Hence option 1 is correct.
Horsepower (HP) is another SI unit of power. We generally calculate the power of an engine in HP.

Additional Information

Some of the physical terms and their SI units are given below: