Force and Pressure Worksheet-2

Force and Pressure Worksheet-2

1. The atmospheric pressure is due to the:

(a) sky above our head

(b) air mass surrounding earth

(c) gravitational force of sun and other planets

(d) mass of the earth

2. The pressure exerted by a liquid:

(a) increases with depth             (b) decreases with depth

(c) is constant                               (d) first increases then decreases

3. Which of the following statement is NOT true.

(a) A freely falling body is acted upon by gravitational force

(b) pressure on top of Mount Everest is much more than 1 atm

(c) S.I. unit of pressure is pascal

(d) the blood vessels in our body maintains the internal pressure equal to the atmospheric pressure

4. Thrust is:

(a) Force X area                           (b) Force / Area

(c) Pressure                                   (d) Pressure X Area

5. A body floats in water because:

(a) no force is acting on it

(b) the net force acting on this body is zero

(c) of gravitational pull

(d) friction between body and the water

6. In which of the following cases the net force is not equal to zero?

(a) A kite skillfully held stationary in the sky

(b) A ball falling freely from a height

(c) A helicopter hovering above the ground

(d) A cork floating on the surface of water

7. A car accelerates on a horizontal road due to the force exerted by:

(a) the engine of the ear              (b) the driver of the car

(c) the earth                                   (d) the road

8. In which of the following activity, friction is useful?

(a) driving a car                            (b) hitting a ball with bat

(c) rowing a boat                          (d) sitting on a chair

9. Friction can be increased by:

(a) making the surfaces rough  (b) using dry surfaces

(c) increasing the weight            (d) all of these

10. If the roughness of a surface is increased to a large extent, then the friction of the surface would:

(a) increase and then decrease

(b) increase continuously

(c) decrease continuously

(d) decrease and then increase

Answer Key:

(1)-(b); (2)-(a); (3)-(b); (4)-(d); (5)-(b); (6)-(b); (7)-(d); (8)-(d); (9)-(d); (10)-(b)