English Medium Class 9 - CBSE Question Bank Solutions

When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.

Describe in your own words, what happens to the particles when salt dissolves in water.

Describe in your own words, what happens to the particles when salt dissolves in water.

Honey is more viscous than water. Can you suggest why?

Honey is more viscous than water. Can you suggest why?

Explain why air is used to inflate tyres.

Explain why air is used to inflate tyres.

Explain why steel is used to make railway lines.

Explain why steel is used to make railway lines.

Write notes on plants and animals as sources of food.

Define matter. Give four examples of matter.

Define matter. Give four examples of matter.

What are the characteristics of matter?

What are the characteristics of matter?

What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.

What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.

In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :

When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :