General Science 8th Class Chapter 8 Force and Pressure Solved Exercise

General Science

8th Class

Chapter 8

Force and Pressure

Questions

1. Encircle the correct option.

(i) Two equal forces act at the same time on the same stationary object but in the opposite directions. Which statement describes the object's motion?

a. The object changes direction

b. The object accelerates

c. The object remains stationary

d. The object moves at a constant speed

(ii) A student pushes against a tree with a force of 10 newtons (N). The tree does not move. What is the amount of force exerted by the tree on the student?

a. 0        b. 5 N        c. 10 N        d. 20 N

(iii) What causes objects to move?

a. Velocity        b. Unbalanced forces

c. Balanced force        d. Friction

(iv) The pressure at the bottom of the tank containing a liquid does not depend on:

a. area of the bottom surface        b. height of the liquid column

c. nature of the liquid        d. acceleration due to gravity

(v) The SI unit of pressure is:

a. watt        b. joule        c. pascal        d. newton

(vi) When same amount of force is applied on different areas, it exerts:

a. low pressure on small area        b. no pressure on small area

c. high pressure on small area        d. high pressure on large area

(vii) A force of 1800 N is acting on the surface area of 0.06 m². The pressure exerted by the force will be:

a. 3 kPa        b. 30 kPa        c. 300 kPa        d. 3000 kPa

(viii) People on hills experience atmospheric pressure:

a. more than that at the sea level

b. less than that at the sea level

c. same as that at the sea level

d. four times more than that at the sea level

(ix) As we go up in the air:

a. atmospheric pressure increases

b. atmospheric pressure decreases

c. atmospheric pressure does not change

d. atmospheric pressure becomes zero at the height of 1 km