Samacheer Kalvi Class 8 Science Force and Pressure Questions - 1

Question: 1

The unit of viscosity is _______

(A) Kg ms^-1

(B) Poise

(C) Nm²

(D) No unit

Question: 2

The value of the atmospheric pressure at sea level is

(A) 7.6 cm of mercury column

(B) 176 cm of mercury column

(C) 760 cm of mercury column

(D) 76 cm of mercury column

Question: 3

Which of the following liquids has more viscosity?

(A) Ghee

(B) Coconut oil

(C) Water

(D) Grease

Question: 4

If we apply a force against the direction of motion of a body, then the body will ______

(A) Move in a different direction

(B) Move with a decreased speed

(C) Move with an increased speed

(D) Stop moving

Question: 5

Pascal's law is used in _____

(A) Pressing heavy bundles

(B) Brake system

(C) Hydraulic lift

(D) All the above

Question: 6

The total force exerted by a body normal to the surface is called _____

(A) Force of gravity

(B) Thrust

(C) Pressure

(D) None of these

Question: 7

The SI unit of force is ______

(A) Newton second

(B) Pascal

(C) Dyne

(D) Newton

Question: 8

The wear and tear in the machine part is due to

(A) Gravitational force

(B) Muscular force

(C) Frictional force

(D) Electrostatic force

Question: 9

The atmospheric pressure on the surface of the earth is about

(A) 10³NM^-2

(B) 10⁴NM^-2

(C) 10⁵NM^-2

(D) 10^-5NM^-2

Question: 10

Pressure exerted by a liquid is increased by

(A) The height of the liquid column

(B) The density of the liquid

(C) Both a and b

(D) None of the above