MEDIUM
9th CBSE
IMPORTANT
Earn 100

Give two reasons for saying that wood is a solid.

Important Questions on Matter in Our Surroundings

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 1 - Matter in Our Surroundings>Long Answer Type Questions>Q 52
Why does a gas exert pressure?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 1 - Matter in Our Surroundings>Long Answer Type Questions>Q 52
Why does a gas fill a vessel completely?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 1 - Matter in Our Surroundings>Long Answer Type Questions>Q 52
Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid? 
EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 1 - Matter in Our Surroundings>Long Answer Type Questions>Q 53

Define matter. Give four examples of matter.   

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 1 - Matter in Our Surroundings>Long Answer Type Questions>Q 53
What are the characteristics of matter?   
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 1 - Matter in Our Surroundings>Long Answer Type Questions>Q 54

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

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 1 - Matter in Our Surroundings>Long Answer Type Questions>Q 54
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? 
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 1 - Matter in Our Surroundings>Multiple Choice Questions (MCQs)>Q 55
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: