11

Total Marks: 30

Total Time: 40 mins

1.   Define one watt of power.

(2 Marks)

2.   Name twy physical quantities whose unit is Joule.

(2 Marks)

3.   What is gravitational potential energy?

(2 Marks)

4.   What is the commercial unit of energy? Define it.

(3 Marks)

5.   Give one example where work done on an object is negative.

(3 Marks)

6.   What work is said to be done to increase the velocity of a car from 15 km/h to 30 km/h, if the mass of the car is 1000 kg?

(3 Marks)

7.   A body possess potential energy of 460 J whose mass is 20 kg and is raised to a certain height. What is the height when g = 10 m/s².

(3 Marks)

8.   Derive the formula for kinetic energy.

(4 Marks)

9.   With pendulum as an example the law of conservation of energy.

(4 Marks)

10.   Derive the formula for potential energy.

(4 Marks)