MEDIUM
9th CBSE
IMPORTANT
Earn 100
Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?
Important Questions on Matter in Our Surroundings
EASY
9th CBSE
IMPORTANT
Define matter. Give four examples of matter.
MEDIUM
9th CBSE
IMPORTANT
What are the characteristics of matter?
HARD
9th CBSE
IMPORTANT
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
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
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:
MEDIUM
9th CBSE
IMPORTANT
Which one of the following statement is correct in respect of fluids?
MEDIUM
9th CBSE
IMPORTANT
A few substances are arranged in the increasing order of the forces of attraction between their particles. Which one of the following represents the correct arrangement?
MEDIUM
9th CBSE
IMPORTANT
In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
(i) increasing pressure on hydrogen contained in a closed container
(ii) some hydrogen gas leaking out of the container
(iii) increasing the volume of the container of hydrogen gas
(iv) adding more hydrogen gas to the container without increasing the volume of the container
