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Rayon and nylon - class-VIII

Description: rayon and nylon
Number of Questions: 18
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Tags: substances in daily use synthetic fibres and plastics fibre to fabric polymer chemistry chemistry
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Bed sheets are made up of:

  1. rayon and wool

  2. rayon and plastic

  3. rayon and nylon

  4. rayon and cotton


Correct Option: D
Explanation:

Bedsheets are made by blended fibre i.e. a mixture of rayon and cotton. Rayon is a versatile fibre and is widely claimed to have the same comfort properties as natural fibres, although the drape and slipperiness of rayon textiles are often more like nylon. It can imitate the feel and texture of silk, wool, cotton and linen. The fibres are easily dyed in a wide range of colours.

Which of the following is a disadvantage of nylon?

  1. They do not shrink

  2. They are less resistant to sun light

  3. They are resistant to insects and molds

  4. They can be easily dyed


Correct Option: B
Explanation:

Nylon fabrics have low resistance to sunlight. 


They are not suitable for curtains or draperies as it is weakened by the exposure to sunlight.

Hence the correct option is B.

The fibres of nylon is stronger than :

  1. steel wire of same thickness

  2. steel wire of different thickness

  3. plastic fibres

  4. rayon


Correct Option: A
Explanation:

Nylon is a synthetic fibre which has certain chemical properties which makes their fibres strong.

The fibre which gives smell of plastic is: 

  1. rayon

  2. silk

  3. wool

  4. nylon


Correct Option: D
Explanation:

Nylon fibre gives smell of plastic.

This is because it is very similar to plastic.
Rayon, Wool, and Silk are the natural polymers which do not have plastic like smell.

Which of the following statement is true?

  1. A nylon thread is stronger than a steel wire

  2. Rayon is a natural fibre made from wood pulp

  3. Cotton is not a polymer

  4. Fabric made from polyester can get wrinkles easily


Correct Option: A
Explanation:

A. Nylon thread is stronger than steel wire because nylon fibre is made up of strong amide linkages which gives it strength.

B. Rayon is a regenerated fibre so it is not natural.

C. Cotton is a polymer of cellulose.

D. Polyester materials are wrinkle-free.

Nylon fibre is useful, because of following properties:

  1. soft, strong and light

  2. transparent, light and easy to wash

  3. strong, elastic and light

  4. hard, inexpensive and strong


Correct Option: C
Explanation:

Nylon fibre is strong, elastic and light. It is lustrous and easy to wash.

A silk saree and a nylon saree, both of same length are put to dry under sun. Which one will dry faster?

  1. Silk saree

  2. Nylon saree

  3. Both will take same time

  4. Depends on weather condition


Correct Option: B
Explanation:

Nylon has various characteristics like a higher impact resistance, a more rapid moisture absorption, greater elasticity and elastic recovery. Nylon absorbs moisture readily as compared to silk so nylon saree dries up faster than silk saree in the sun.

Ropes made of nylon and polyester are commonly used in cranes and elevators because :

  1. Nylon is inflammable

  2. It is a good conductor of heat and electricity

  3. It is very strong, fairly elastic and light weight

  4. It is heat resistant


Correct Option: C
Explanation:

Ropes made of nylon and polyester are commonly used in cranes and elevators because It is very strong, fairly elastic and light weight.

Rayon is different from synthetic fibres because :

  1. it has a silk appearance

  2. it is obtained from wood pulp

  3. it can also be woven like those of natural fibres

  4. it is natural


Correct Option: B
Explanation:

Rayon is manufactured regenerated cellulose fiber. It is made from purified cellulose from wood pulp which is converted into soluble compound which is chemically solidified to form synthetic fiber. Because rayon is manufactured from naturally occurring polymers, it is considered a semi-synthetic fiber.

Synthetic fibres having almost common property are:

  1. nylon and polyster

  2. nylon and plastics

  3. polyster and plastics

  4. all of the above


Correct Option: A
Explanation:

Synthetic fibres having commmon property are nylon and polyster.

Which of the following statements is incorrect?

  1. Nylon clothings can with stand high temperature and are, therefore, good to wear in summers.

  2. Thermosetting plastics do not become soft on heating.

  3. Addition polymers are formed without the elimination of byproduct molecules.

  4. Natural rubber is obtained as latex from rubber trees.


Correct Option: A

Read the following statement and mark the correct answer.


I. Artificially prepared synthetic fibre which resembles silk is known as terylene.
II. Rayon is not considered as a synthetic fibre as it is regenerated from cellulose.
III. PET bottles and jars are made up of polyesters. 

  1. Statement I is false, II and III are true

  2. Statement I is true, II and III are false

  3. Statement I and II are false, III is true

  4. Statement II is true, I and II are false


Correct Option: A

The fibre developed in Newyork & London simultaneously is known as:

  1. rayon 

  2. silk

  3. PVC

  4. nylon


Correct Option: D

The fibre obtained from cellulose is:

  1. polyester

  2. nylon

  3. acrylic

  4. rayon


Correct Option: D
Explanation:

The fibre obtained from cellulose is rayon.


Because of the reconversion of the soluble compound to cellulose, rayon is referred to as a regenerated cellulose fibre. 

There are several types of rayon fibers in commercial use today, named according to the process by which the cellulose is converted to the soluble form and then regenerated.

Thus, option $D$ is correct.

Nylon is an example of thermoplastic.

  1. True

  2. False


Correct Option: A
Explanation:

 Nylon is a thermoplastic silky material that can be melt-processed into fibers.


Thermoplastics are the polymers which lose their shape on heating and regain their shape on cooling.

Examples: Nylon, PVC, polystyrene, etc.

Rayon is:

  1. natural silk.

  2. artificial silk.

  3. regenerated fibre.

  4. synthetic fibre.


Correct Option: C
Explanation:

Rayon is a regenerated fibre.


It is obtained from nature and then it is processed in factories in order to get the desired properties.
Hence, C is correct option.

_________  is stronger than steel wire.       

  1. Cotton fibre

  2. Silk thread

  3. Plastic thread

  4. Nylon fibre


Correct Option: D

The material similar to silk in appearance is :

  1. nylon

  2. rayon

  3. polyester

  4. terylene


Correct Option: B
Explanation:
The material similar to silk in appearance is rayon. 

Since rayon resembles silk in appearance, it is called artificial silk.

It is a man-made fibre obtained from a natural source wood pulp.

Hence the correct option is B.
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