Give reasons : (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

Tabulate the differences in the characteristics of states of matter. (b) Comment upon the following: Rigidity, Compressibility, fluidity, filling a gas container, shape, kinetic energy and density.

The mass per unit volume of a substance is called density (density = mass/ volume). Arrange the following in order of increasing density-air, exhaust from chaimnays, honey, water, chalk, cotton and iron.

What are the characteristics of the particles of matter?

A diver is able to cut through water in a swimming pool. Which property of matter does this observation show ?

The smell of hot sizzling foods reaches your several metres away, but to get the smell from cold, food, you have to go to close.