Fibre

Q.

The separation of seeds from cotton fibers is called as:

1. Winnowing

2. Threading

3. Ginning

4. Spinning

Q.

How is rayon made

Q. Rayon is prepared by the:

1. Physical Treatment of silk

2. Physical treatment of wood pulp

3. Heat treatment of silk

4. Chemical treatment of wood pulp

Q. Which of the following fibre is also known as regenerated fibre?

1. Nylon
2. Rayon
3. Polyester
4. Acrylon

Q. Write the importance of synthetic polymers in our life.​

Q. Which of the following is correct sequence from fibre to fabric?

1. Fibre - Yarn - Thread - Fabric
2. Yarn - Fabric - Fibre - Thread
3. Fabric - Yarn - Thread - Fibre
4. Thread - Fibre - Fabric - Yarn

Q.

Which of these is NOT a natural fiber?

1. Cotton

2. Nylon

3. Silk

Q.

96 How will you identify between cotton, wool, silk, and synthetic fabrics?

Q. The plastic that is used to make pipes is popularly known as PVC. What does PVC stand for?

1. Phosphovinyl chloride
2. Phosphovanadium chloride
3. Polyvinyl chloride
4. Polyvanadium chloride

Q.

From Where Do We Get Wool

Q. Assertion: It is advised not to wear synthetic clothes while working in a laboratory.
Reason: The synthetic fibre melts on heating.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of assertion.
3. The assertion is true but the reason is false.
4. The assertion is false but the reason is true.

Q. The dyed woolen fibres are straightened by the process of ___________.

1. sorting
2. combing
3. shearing
4. scouring

Q.

What properties of nylon make it an ideal material for making parachutes? Give two reasons.

Q. Clothes made up of polyester are wrinkle-resistant.

1. True
2. False

Q.

What is weaving and knitting

Q. A is a single and elongated piece of material which is similar to threads.

1. fibre
2. atom
3. cellulose
4. polymer

Q.

Rayon is prepared by

1. Physical Treatment of silk

2. Physical treatment of wood pulp

3. Heat treatment of silk

4. Chemical treatment of wood pulp

Q. Rayon has properties similar to that of cotton fibre.

1. False
2. True

Q.

(a) What is rayon ? How is rayon made ?

(b) Give any two uses of rayon.

Q.

Towards the end of 19th century, scientists were successful in obtaining a fibre having properties similar to that of silk and it is referred as artificial silk. What is this artificial silk called?

1. Nylon

2. Rayon

3. Polyester

4. Acrylic

Q. Polyester is made by combining

1. ethyl alcohol and terephthalic acid
2. ethylene gylcol and diethyl ester
3. ethylene gylcol and terephthalic acid
4. dimethyl ester and diethyl ester

Q. In which of the following options the synthetic polymer is incorrectly matched with its use?

1. Teflon: Non-stick cookware
2. Melamine: Fire fighter's uniform
3. Acrylic: Toothbrush bristles
4. Polyester: Sportswear

Q. Question 13
Terrycot is made by mixing two types of fibres. Write the names of the fibres.

Q. Why is it not advisable to wear synthetic clothes while bursting fire crackers?

1. (i) only
2. (ii) only
3. (i) and (iii)
4. (ii) and (iii)

Q.

Which grade of plastic is good for health?

Q. What are bended fiber? Give any two examples.

Q.

1 What are fabrics? What are different kinds of fabrics?

Q.

46 Explain the process of the formation of yarn from cotton wool.

Q. Is rayon a natural fiber or synthetic fiber

Q.

22. Write the process which is used to separate cotton fibres from the seeds.