Question

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Answer 1

Answer:

8. When a balloon held between the hands is pressed, its shape changes. This happens because

a. Balanced Forces act on the balloon

b. Unbalanced force act on the balloon

c. Frictional force act on the balloon

d. Gravitational force acts on the balloon

9. Which of the following situations involves the Newton's second law of motion?

A Force can stop a lighter vehicle as well as a heavier vehicle which are moving

a. A force exerted by a lighter vehicle on collision with the heavier vehicles results in both the vehicles coming to stand still

b. A force can easily accelerate a lighter vehicle more easily than a heavier vehicle which are moving

c. A force exerted by the escaping air from a balloon in the downward direction

makes the balloon to go upwards

10. Newton's first law of motion says that a moving body should continue to move forever, unless some external forces act on it. But a moving cycle comes to rest after some time

if we stop pedaling it. Cam you choose the correct reason for the stoppage of cycle?

a. Air resistance

b. Gravitational pull of the earth

c. Friction of the road

d. Heat of the environment

Choose the correct option

a. (iii) and (iv)

b. (i) and (iii)

c. (i) and (ii)

d. (ii) and (iii)

c. 0.01m / s d. 0m / s

12. The inertia of a moving object depends on :

a. Mass of the object

b. Momentum of the object

c. Speed of the object

d. Shape of the object

11. A man wearing a bullet-proof vest stands on roller skates. The total mass is 80kg. A bullet of mass 20g is fired at 400m / s It is stopped by the vest and falls to the ground. What is then the velocity of the man?

a. 1m / s b. 0.1m / s