Question

Answer the following questions:

1. Why do we need to group materials?

2. Name any four properties that can be used for sorting materials.

3. What is meant by hard & soft materials? Give 2 examples of each.

Answer 1

Answer:

1. So for the convenience and to make the study of different materials easier and convenient we group the materials on the basis of different properties. ... The grouping or the classification of materials makes the study easier and also saves our time and energy.
2. different sizes and shape. for example. big and small etc.
3. different physical properties. for example. metals and non metals etc.
4. difference in weight. for example. light and heavy.
5. difference in chemical properties.
6. Those materials which cannot be easily compressed, cut, bent or scratched are called hard materials. Examples: Iron, glass. Those materials which can be easily compressed, cut, bent or scratched are called soft materials. Examples: Sponge, Cotton.