Question

B
State True or False for the following statements.
1. Natural fibres are highly resistant to the effects of
chemicals like acids and alkalis.
Synthetic fibres absorb very little water
&
Thermoplastics can be easily remoulded on heating.
The plastic, used for insulating electrical wires, is teflon.
All types of plastics are biodegradable.
5.
C
Tick ( the correct option.
L The correct choice for the box, in the following sequence, is-
thermoplastic : PVC; thermosetting plastic: ?
nylon
polystyrene
bakelite
polythene
2. Which of the following is also known as the 'wonder polymer?
nylon
polystyrene
polythene
acrylic​

Answer 1

Answer:

1. true

2. false

3.true

4.false

Answer 2

1) It is false that, natural fibres are highly resistant to the effects of chemicals like acid and alkali.

For example,if we put a cotton ball into concentrated sulphuric acid then the cotton ball will start melting/burning.

2) It is true that synthetic fibres absorb very little amount of water because the surface pours are very little in amount in the synthetic fibres.

3) It is true that thermoplastic can be remoulded on heating.

4) It is false that teflon is used for insulating electrical wires.

5) It is false that all types of plastics are biodegradable.

6) Thermosetting plastic is the bakelite.

7) Nylon is known as the wonder polymer.