SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Water (or) liquids exert pressure on ______.

The pressure does not depend upon ______.

A solid floats in liquid with a portion of it being submerged. Then ______.

1. The liquid exerts an upthrust equal to the weight of the solid
2. The weight of the dispersed liquid is equal to the weight of solid
3. Solid exerts a force equal to its weight on liquid

If the volume of the object is above the water surface, then the object is less dense.

Differentiate Liquid from Gas

How will you calculate fluid pressure?

Assertion (A): The force acting on the surface of a liquid at rest, under gravity, in a container is always horizontal.
Reason (R): The forces acting on a fluid at rest have to be normal to the surface.

Assertion (A): The force acting on the surface of a liquid at rest, under gravity, in a container is always horizontal.
Reason (R): The forces acting on a fluid at rest have to be normal to the surface.

What is the difference between electromagnetic force and potential difference?

The force between two parallel wires carrying currents has been used to define ______.

Electric lines of force are ______ lines.

Name the force which acts between two point charges to obey Newton’s third law.

Define the following: 

Electric force

What are natural magnets?

Permanent magnets are made of hard magnetic materials like alnico.

Total internal reflection will occur if the angle of reflection is ______.

We can see objects because of ______.

The angle of incidence is equal to the angle of reflection for perfect reflection. 

______ is greater for liquids than solids and it is maximum in gases.

When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.