Synthetic Fiber

Q.

Why should we wear cotton clothes in summer?

Q.

State the characteristics of synthetic fibres.

Q.

Question 1
Explain why some fibres are called synthetic.

Q.

Why synthetic fibres are more popular than natural fibres?

Q.

Question 14
'Manufacturing synthetic fibres is actually helping conservation of forests'. Comment.

Q. Question 4
Which is a thermosetting plastic?

(a) Melamine
(b) Polythene
(c) PVC
(d) Nylon

Q.

Bakelite is an example of ________ plastics

Q.

Which of the following is a biodegradable polymer?

1. Bakelite

2. PHBV

3. PVC

4. Polythene

Q.

Melamine is used in fire resistant fabrics. Why?

Q.

Question 3 (b)
Synthetic fibres are synthesized from raw materials called ________.

Q.

Question 3 (a)
Synthetic fibres are also called ________or _________fibres.

Q.

Materials derived from petroleum that are then used to make synthetic fibres are called _____.

1. Rayon

2. Petrochemicals

3. Nylon

4. Rubber

Q.

Question 1
Explain why some fibres are called synthetic.

Q.

State one disadvantage of using synthetic fibres for making clothes.

Q.

Which of the following is not a synthetic fibre ?

(a) nylon (b) flax (c) acrylic (d) polyester

Q.

Write five uses of melamine plastic

Q.

The clothes of a person working in the kitchen catch fire accicently causing severe burns. The person is most likely wearing clothes made of :

(a) flax (b) rayon (c) terylene (d) cotton

Q.

The non-stick coating on frying pans is that of a plastic called :

(a) polyvinyl chloride (b) melamine (c) bakelite (d) teflon

Q.

We should wear synthetic clothes while working in kitchen or laboratory. True/False.

1. True

2. False

Q. Statement I:- Synthetic fibres are wrinkle-free and dry faster.

Statement II:- Synthetic fibres are costlier than natural fibres.

1. Statement I is incorrect but II is correct
2. Both statements I and II are correct
3. Both statements I and II are incorrect
4. Statement I is correct but II is incorrect

Q.

Fill in the following blanks with suitable words :

(a) Synthetic fibres are also called .......... or ....... fibres.

(b) Synthetic fibres are made from raw materials called .......

(c) Like synthetic fibres, plastic is also a ........

(d) The use of plastics can be reduced by using bags made of ........ or ......... instead of polythene bags.

Q.

Why should we not wear clothes made of synthetic fibres (like nylon or polyester) while working in the kitchen ?

Q.

Sangeeta took four different strings of cotton, wool, silk, and nylon. The length of each string is 60 cm, while the thickness of all strings is the same. Now, all strings are tied to the clamp in such a way that they hang freely from it (as shown in the figure). At the free end of each thread, a pan is suspended to place weights in it.

Sangeeta adds weights in each pan till the threads break. Which string requires the maximum weight to break?

1. Cotton
2. Nylon
3. Wool
4. Silk

Q. Identify the products that are made from petrochemicals.

1. Paints
2. Crayons
3. Ointments
4. Candles

Q.

Which of the following is most suitable for summer?

1. Cotton

2. Nylon

3. Polyester

4. Silk

Q.

Materials derived from petroleum that are then used to make synthetic fibres are called _____.

1. Petrochemicals

2. Rayon

3. Nylon

4. Rubber

Q.

Petrochemicals are:

1. mixtures of petrol and chemical fertilizer.

2. materials obtained from petroleum refining.

3. mixtures of coal and petrol.

4. mixtures of wood and chemicals.

Q. Which of the following is a thermosetting plastic?
(a) melamine
(b) teflon
(c) polythene
(d) PVC

Q.

Firefighters' uniform is coated with a plastic that is fire resistant. Identify the plastic from the given options.

1. Teflon

2. Polyester

3. PET

4. Melamine

Q. We should not wear synthetic clothes while working in the kitchen or in a laboratory.

1. True
2. False