$(a)$ Define boiling point.
$(b)$ Express the boiling point of water in Celsius as well as Kelvin scale.
$(c)$ $A$ diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

$A$ few substances are arranged in the increasing order of 'forces of attraction' between their particles. Which one of the following represents a correct arrangement?

What happens to the heat energy that is supplied to a solid once it starts melting?

Classify the following processes into osmosis or diffusion:
$(a)$ Swelling up of a raisin on keeping in water.
$(b)$ Spreading of virus on sneezing.
$(c)$ Earthworm dying on coming in contact with common salt.
$(d)$ Shrinking of grapes kept in thick sugar syrup.
$(e)$ Preserving pickles in salt.
$(f)$ Spreading of smell of cake being baked throughout the house.
$(g)$ Aquatic animals using oxygen dissolved in water during respiration.

The kinetic energies of water particles in three vessels $A, B$,and $C$ are $E_A, E_B$,and $E_C$ respectively,where $E_A > E_B > E_C$. Arrange the temperatures $T_A, T_B$,and $T_C$ of the water in the three vessels in increasing order. Provide a reason for your answer.

Ravi added a small amount of common salt to water taken in a graduated cylinder. On dissolution,there was no detectable change in the level of water. Explain why this is so.