Physics Structure of Matter Questions and Answers - 2

Question: 6

Define solid?

The matter that occupies a definite space and has a definite mass and shape is called solid.

Question: 7

Define liquid?

The matter that occupies a definite space and has a definite volume and mass but no definite shape is called liquid.

Question: 8

Define gas?

The matter that neither occupies a definite space nor has a definite shape and volume but has a definite mass is called gas.

Question: 9

What is called melting?

The conversion of a solid into a liquid on heating is called melting.

Question: 10

Define atom?

The smallest unit of an element which may or may not take have an independent existence, but always takes part in a chemical reaction is called an atom.

Example: hydrogen atom, sulphur atom.