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Class 8

Explore popular questions from Synthetic Fibres and Plastics for Class 8. This collection covers Synthetic Fibres and Plastics previous year Class 8 questions hand picked by experienced teachers.

Synthetic Fibres and Plastics

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Q 1. Process through which artificial silk or rayon can be produced is

A

Cupro ammonium process

B

Cellulose acetate process

C

Viscose process

All of these

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Q 2. Which of the following is not a synthetic fibre?

A

Nylon

Wool

C

Rayon

D

PVC

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Q 3. Uses of rayon are

A

Manufacture of carpets

B

To make smooth silky clothes

C

Manufacture of automobiles tyres

All of these

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Q 4. Synthetic fibre is preferred over natural fibre due to

A

Durability

B

Easy availability

C

Cheap

All of these

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Q 5. Soft drinks and baby feeding bottles are generally made up

A

Polyester

B

Polyamide

Polystyrene

D

Polyurea

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Q 6. Orlon is a polymer of

A

Styrene

B

Tetra fluoroethene

C

Vinyl chloride

Acrylonitrile

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Q 7. Examples of Biodegradable Polymers are

A

Aliphatic polyesters

B

Nylon-2- Nylon 6

C

Poly glycolic acid & PHBV

All of these

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Q 8. Polymers can be copolymer if

A

monomers are of more than one kind

B

monomeric units linked together to form 3-dimensional network.

C

Some examples are Malamine, Bakelite

All of these

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Q 9. Radios, telephones, clocks etc are made up of _______

A

Malamine

Bakelite

C

Both of these

D

None of these

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Q 10. These polymers cannot be recycled :

A

Thermoplastics

Thermosets

C

Elastomers

D

All polymers

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Q 11. Teflon is well known for its :-

A

Antistick property

B

Is bad conducter of electricity

C

It is used as a lubricant in machine where Oil cannot be easily applied

All of these

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Q 12. The plastic whose sheets are used for packing liquids is

Polythene

B

Polystyrene

C

Bakelite

D

Teflon

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Q 13. From which plastic material is thermocol made?

A

Polythene

Polystyrene

C

Bakelite

D

Teflon

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Q 14. To which of the following 4R principle applymost?

A

Synthetic fibre

B

Natural fibre

Plastic

D

Metals

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Q 15. Which of the following does not decompose?

A

jute

B

cotton

plastic

D

wool

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Q 16. Which of the following is used in automobile battery casings ?

A

HDPE

PP

C

PVC

D

Polyester

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Q 17. The process of obtaining jute fibres from its stem is known as-

A

bales.

B

gunning

C

bobbing

retting

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Q 18. Flax is a kind of

A

animal skin

B

synthetic fibre

plant

D

none of these

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Q 19. Which thing is made from cotton ?

A

Nylon

B

Terylene

Rayon

D

Acrylic

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Q 20. A woman was wearing a silk saree and a woollen shawl from Tibet and carrying a purse of India goat fur.
Read the following statements.
a. Silk fiber is made up of protein and is produced by silk worm.
b. Silk fiber is made up of carbohydrates and is produced by silk worm caterpillars.
c.Yak is an animal which produces wool.
d. Woolly dog yields very fine wool.
e. Goats are normally sheared during winter season when hair growth is maximum
Select the alternative which includes all the correct statements.

A

b, c, d

a, c

C

a, b, d, e

D

a, c, e

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Q 21. The clothes made from which of the following fibers will take lesser time than others to dry if soaked in water ?

Silk

B

Wool

C

Cellulose

D

Rayon

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Q 22. The fiber synthesized by man in the beginning is

A

Rayon

Nylon

C

Polyester

D

Rexin

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Q 23. Which is the natural fiber from the following ?

Jute

B

Acrylinc

C

Nylon

D

None of these

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Q 24. Match thefollowing:

Column I Column II
A. Rayon (i) used for making sweaters
B. Nylon (ii) made up of large number of glucose unit
C. Acrylic (iii) Obtained from wood pulp
D. Cellulose (iv) Used for making parachutes & socks

A

A-ii, B-i, C-iv, D-iii

A-iii, B-iv, C-i, D-ii

C

A-i, B-ii, C-iv, D-iii

D

A-iv, B-iii, C-ii, D-i

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Q 25. Which of the following has the same monomer unit ?

A

Nylon and cellulose

B

Polyester and nylon

C

Rayon and nylon

Cellulose and rayon