Available Answers

1. 1.

   What would you do to make a metallic object regain its lustre after it has lost its sheen?

2. 2.

   Name two hard and two soft solids.

3. 3.

   Name two objects, the surfaces of which are smooth and two, the surfaces of which are rough.

4. 4.

   How do aquatic plants and animals survive in water?

5. 5.

   Classify wood in three ways on the basis of its properties.

6. 6.

   Classify glass in three ways on the basis of its properties.