Substances and Objects

Q.

Pooja has to work in the laboratory. What kind of clothes should she wear? Give the reason for your answer.

Q. Natural fibres when burned, melt and stick to our body

1. True
2. False

Q.

Which is not a property of synthetic fibres?

1. They catch fire easily.

2. They are long lasting.

3. They get wrinkled very fast.

4. They are easy to wash.

Q. Name the natural fibre used in the production of following items.

1. 
2. 
3. 
4. 

Q.

If you are given two sample pieces of cloth made of synthetic silk and natural silk which look the same, which among the following tests would you employ to find which cloth is natural and which one is synthetic?

1. Put the cloth in water

2. Feel the texture of cloth

3. Burn and smell the fumes of the cloths

4. It is impossible to find out.

Q. Name the natural fibre used in the production of following items.

1. 
2. 
3. 
4. 

Q. If you are given two sample pieces of cloth made of synthetic silk and natural silk which look the same; which among the following tests would you employ to find which cloth is natural and which one is synthetic?

1. It is impossible to find out
2. Burn and smell the fumes of the clothes
3. Feel the texture of cloth
4. Put the cloth in water