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Class 8 Science Study Material

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Synthetic Fibres and Plastics

The first fully man made fibre was

a) Polyester.
b) Acrylic.
c) Rayon.
d) Nylon.

✔Answer

✔Solution

Correct Answer Is : Nylon.

Solution Is : Nylon is a man-made fibre.In 1931, it was made without using any natural raw material (from plant or animal).It was prepared from coal, water and air.It was the first fully synthetic fibre.

Rayon was obtained by the chemical treatment of

a) Paper.
b) Wood pulp.
c) Fruit pulp.
d) Cloth.

✔Answer

✔Solution

Correct Answer Is : Wood pulp.

Solution Is : Towards the end of the nineteenth century, scientists were successful in obtaining a fibre having properties similar to that of silk.Such a fibre was obtained by the chemical treatment of wood pulp.This fibre was called as rayon or artificial silk.

An example of natural fibre is

a) Nylon.
b) Polyester.
c) Rayon.
d) Cotton.

✔Answer

✔Solution

Correct Answer Is : Cotton.

Solution Is : Cotton is a natural fibre and is obtained from cotton plant.Nylon, polyester and rayon are man-made or synthetic fibres.

A polyester fibre is

a) Rayon.
b) Terelene.
c) Nylon.
d) Acrylic.

✔Answer

✔Solution

Correct Answer Is : Terelene.

Solution Is : Terelene is a synthetic fibre made of a chemical called terephthalic acid.It is used for clothing, sheets, ropes, sails, etc.

The synthetic fibre which resembles with wool is

a) Nylon.
b) Polycot.
c) Polytester.
d) Acrylic.

✔Answer

✔Solution

Correct Answer Is : Acrylic.

Solution Is : Many of the sweaters that we use are actually not made from natural wool, though they appear to resemble with wool.These are prepared from another type of synthetic fibre called acrylic.The wool obtained from natural sources is quite expensive, whereas clothes made from acrylic are relatively cheap.

An example for man made fibre is

a) Acrylic.
b) Silk.
c) Cotton.
d) Jute.

✔Answer

✔Solution

Correct Answer Is : Acrylic.

Solution Is : Acrylic is a man- made fibre. They are actually not made from natural wool, though they appear to resemble wool. These are prepared from another type of synthetic fibre called acrylic. Cotton, silk and jute are natural fibres.

The synthetic fibre also known as artificial silk is

a) Rayon.
b) Acrylic.
c) Nylon.
d) PET.

✔Answer

✔Solution

Correct Answer Is : Rayon.

Solution Is : Scientists were successful in obtaining a fibre having properties similar to that of silk.Such a fibre was obtained by the chemical treatment of wood pulp.This fibre was called rayon or artificial silk.

Parachutes and ropes used for climbing a mountain are made of

a) Rayon.
b) Polyester.
c) Acrylic.
d) Nylon.

✔Answer

✔Solution

Correct Answer Is : Nylon.

Solution Is : Nylon is used for making parachutes and ropes for rock climbing.A nylon thread is even stronger than a steel wire.

An example of a non-biodegradable substance is

a) Paper.
b) Wood.
c) Tin can.
d) Woolen clothes.

✔Answer

✔Solution

Correct Answer Is : Tin can.

Solution Is : A material which is not easily decomposed by natural processes is termed as non-biodegradable.Tin can is non-biodegradable.

Cotton is a polymer of

a) Fructose.
b) Glucose.
c) Maltose.
d) Sucrose.

✔Answer

✔Solution

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Class 8 Science Study Material

Synthetic Fibres and Plastics

The first fully man made fibre was

Correct Answer Is : Nylon.

Solution Is : Nylon is a man-made fibre.In 1931, it was made without using any natural raw material (from plant or animal).It was prepared from coal, water and air.It was the first fully synthetic fibre.

Rayon was obtained by the chemical treatment of

Correct Answer Is : Wood pulp.

Solution Is : Towards the end of the nineteenth century, scientists were successful in obtaining a fibre having properties similar to that of silk.Such a fibre was obtained by the chemical treatment of wood pulp.This fibre was called as rayon or artificial silk.

An example of natural fibre is

Correct Answer Is : Cotton.

Solution Is : Cotton is a natural fibre and is obtained from cotton plant.Nylon, polyester and rayon are man-made or synthetic fibres.

A polyester fibre is

Correct Answer Is : Terelene.

Solution Is : Terelene is a synthetic fibre made of a chemical called terephthalic acid.It is used for clothing, sheets, ropes, sails, etc.

The synthetic fibre which resembles with wool is

Correct Answer Is : Acrylic.

An example for man made fibre is

Correct Answer Is : Acrylic.

Solution Is : Acrylic is a man- made fibre. They are actually not made from natural wool, though they appear to resemble wool. These are prepared from another type of synthetic fibre called acrylic. Cotton, silk and jute are natural fibres.

The synthetic fibre also known as artificial silk is

Correct Answer Is : Rayon.

Solution Is : Scientists were successful in obtaining a fibre having properties similar to that of silk.Such a fibre was obtained by the chemical treatment of wood pulp.This fibre was called rayon or artificial silk.

Parachutes and ropes used for climbing a mountain are made of

Correct Answer Is : Nylon.

Solution Is : Nylon is used for making parachutes and ropes for rock climbing.A nylon thread is even stronger than a steel wire.

An example of a non-biodegradable substance is

Correct Answer Is : Tin can.

Solution Is : A material which is not easily decomposed by natural processes is termed as non-biodegradable.Tin can is non-biodegradable.

Cotton is a polymer of

Correct Answer Is : Glucose.

Solution Is : Cotton is a polymer called cellulose.Cellulose is made up of a large number of glucose units.

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