Question

A. Tick the most appropriate answer.

In which of the following situations, no work is said to be done?
a. drawing water from a well
b. kicking a ball
c climbing up a hill
d pushing a wall

2. No work is said to be done if the angle between the directions of force and displacement is
a. 0°
b. 90°
c. between 0 and 90 d.
d.180°

3. If the force applied on a body decreases, then the work done on it will
a decrease.
b. increase.
cremain the same.
d. be zero.

When a ball is thrown vertically upwards, the gravitational potential energy of the ball
a. Increases
b. decreases.
c. remains the same.
d. becomes zero.

3. Which form of energy is possessed by a stretched spring?
a chemical
b. elastic potential
kinetic
d. heat

6. Which of the following is an example of stored energy?
a light energy
b. sound energy
c. electrical energy
d. chemical energy

7. If the velocity of an object increases, then its kinetic energy
a. increases.
b. decreases.
c. remains the same.
d. becomes zero.

8. What is the SI unit of power?
a. J
b. J/S
6. J.S
d. S​

Answer 1

Answer:

1.d

2.c

3.a

4.c

5.b

6.c

7.a

8.b

Answer 2

Answer:

1d = pushing a wall

2b = 90o

3a = decrease

4a = increases

5b = elastic potential

6d = chemical energy

7a = increases

8b = J/S