MEDIUM
9th CBSE
IMPORTANT
Earn 100

Describe an activity to prove that particle of matter have space between them?

Important Questions on Practice Paper 4

MEDIUM
9th CBSE
IMPORTANT
Calculate the number of atoms in 124 grams of phosphorous, P4.
EASY
9th CBSE
IMPORTANT
How many molecules of phosphorus are in there in 124 grams of P4.
HARD
9th CBSE
IMPORTANT
How can we separate a mixture of kerosene oil and water? What type of liquids are these? Explain the principle of their separation. 
MEDIUM
9th CBSE
IMPORTANT
A boy lying on a mattress, stands up on it. He observes that the mattress is now depressed deeper down. Why does it happen?
EASY
9th CBSE
IMPORTANT
Aditi clapped her hands near a cliff and heard the echo after 4 seconds. What is the distance of the cliff from her if the speed of sound is taken as 346 m s-1.