CBSE 8th Standard Science Synthetic Fibres and Plastics Sample Question Papers Study Material - QB365 Set B | QB365

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CBSE 8th Standard Science Synthetic Fibres and Plastics Sample Question Papers Study Material - QB365 Set B

Published on: 29/10/2025

Question Set B

CBSE 8th Standard Science Synthetic Fibres and Plastics Sample Question Papers Study Material - QB365

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chapter: Synthetic Fibres and Plastics - Sample Question Papers

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Questions:

Generic 3

5 x 3 = 15

Discuss all the physical properties of metals

One day Reeta went to a jeweller's shop with her mother. Her mother gave an old jewellery to the goldsmith to polish. Next day, when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of these properties.

Properties	Metals	Non-metals
(a) Appearance
(b) Hardness
(c) Malleability
(d) Ductility
(e) Heat conduction
(f) Conduction of electricity

Explain why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards.

Explain the difference between thermoplastic and thermosetting plastics.

Generic 2

9 x 2 = 18

What are petrochemicals?

Given in figure you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.

(a)......... is a metal.
(b) Metals are good.......... of electricity.

A substance was burnt in air. The white residue obtained was added to water. This water solution turned red litmus into blue. State whether the substance is a metal or a non-metal.

Why are bells made of metals?

10.

A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the non-metal.

11.

Ductility is the property of metals. What do you mean by ductility?

12.

Why is it not advisable to burn plastic and synthetic fabrics?

13.

As a responsible citizen, we should remember the 4R principle. Can you tell what do 4Rs stand for?

14.

Name the man-made fibre which is prepared from natural materials

Multiple Choice Question

10 x 1 = 10

15.

Some metals react with bases to produce gas:

(a)

Oxygen

(b)

Nitrogen

(c)

Hydrogen

(d)

Carbon dioxide

16.

Which is not a property of plastic?

(a)

biodegradable

(b)

light

(c)

strong

(d)

durable

17.

Rayon is obtained by:

(a)

Petroleum products

(b)

fully synthetic method

(c)

chemical treatment of wood pulp

(d)

all methods

18.

The non-metal which is liquid at room temperature is

(a)

iodine

(b)

chlorine

(c)

carbon

(d)

bromine

19.

Which of the following reacts with cold water vigorously?

(a)

Carbon

(b)

Sodium

(c)

Magnesium

(d)

Sulphur

20.

Which of the following is not a metal?

(a)

Copper

(b)

Sulphur

(c)

Aluminium

(d)

Iron

21.

Which of the following statements is correct?

(a)

All metals are ductile

(b)

All non-metals are ductile

(c)

Generally, metals are ductile

(d)

Some non-metals are ductile

22.

The material which is commonly used for making kitchen containers is

(a)

PVC

(b)

acrylic

(c)

teflon

(d)

PET

23.

Which is a thermosetting plastic?

(a)

Melamine

(b)

Polythene

(c)

PVC

(d)

Nylon

24.

Polycot is obtained by mixing

(a)

nylon and wool

(b)

polyester and wool

(c)

nylon and cotton

(d)

polyester and cotton

True or False

5 x 1 = 5

25.

Carbon can be drawn into wires.

(a)

True

(b)

False

26.

Articles made up of metals produce ringing sound when struck hard.

(a)

False

(b)

True

27.

Generally, non-metals react with acids.

(a)

True

(b)

False

28.

Most of the plastics are biodegradable

(a)

True

(b)

False

29.

Acrylic is an artificial wool.

(a)

False

(b)

True

Fill up / 1 Marks

4 x 1 = 4

30.

________ are used to wrap food items.

31.

The fibres that are made by human beings, are called _______ or _______ fibres.

32.

Cellulose is made of a large number of _______.

33.

Iron is _______________ reactive than copper.

Generic 5

2 x 5 = 10

34.

Write the difference between metals and nonmetals on the basis of their physical properties.

35.

Metals are malleable and ductile. They possess such properties which make them useful for a number of purposes, e.g. in making coins, jewellery, electrical wires, etc. For different requirements, different metals are used. It depends on the nature of metals. Now give the answer of the following questions.
(a) Give two reasons why gold is used in making jewellery?
(b) If you have to select the metal among copper, aluminium and silver for the transmission of electricity, which one would you prefer and why?
(c) Between silver and copper, which is the better conductor of heat?
(d) Generally, silver foils are used for the decoration of sweets. Are they harmful for us? If yes, then in what manner?

Match the following

4 x 1 = 4

36.

Lustre

37.

Calcium hydroxide

38.

Plastic bags

39.

Petrochemicals

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Answers Key:

Generic 3

5 x 3 = 15

Physical properties of metals:
(i) Metals are good conductors of heat and electricity.
(ii) Metals are malleable and ductile.
(iii) They are lustrous and can be polished.
(iv) Generally they are solid at room temperature except mercury.
(v) Metals generally have high melting and boiling points.

Gold is a metal which is washed or polished in acidic solution. During the process of polishing, some gold dissolves in acid to form oxide. This causes the loss of gold from the jewellery.

Properties	Metals	Non-metals
(a) Appearance	Lustrous	Non-lustrous
(b) Hardness	Hard except sodium and potassium	Generally soft except diamond
(c) Malleability	Malleable	Non-malleable
(d) Ductility	Ductile	Non-ductile
(e) Heat conduction	Good conductors	Poor conductors
(f) Conduction of electricity	Good conductors	Poor conductors

(a) The handles of saucepan are made up of thermosetting plastics because it is a poor (bad) conductor of heat and thus, we can hold the hot saucepan safely without getting our hands burnt.
(b) Electric plugs/switches/plug boards are made up of thermosetting plastics because it is a bad conductor of electricity and thus, protects us from electric current passing through them

Differences between thermoplastics and thermosetting plastics are as follows:

Thermoplastics	Thermosetting plastics
These are the plastics, which get deformed easily on heating, e.g. polythene and PVC.	These are the plastics, which when moulded once, cannot be softened by heating, e.g. bakelite and melamine
These are used for making toys, Combs, various types of containers,etc.	In thermosetting plastics, bakelitesare used for making electrical switches, handles of various utensils, etc. Melamine used for making floor tiles, kitchen wares and fabrics which resist fire.

Generic 2

9 x 2 = 18

All synthetic fibres are prepared by a number of processes using raw materials of petroleum origin, called petrochemicals.

(a) Iron
(b) conductors

The substance is a metal

Metals have sonorous property. Ringing sound produce by metals is known as sonorous. So, the bells are made of metals.

10.

Iodine solution is used as an antiseptic.

11.

The property of metals by which they can be drawn into wires is called ductility.

12.

Burning of plastics and synthetic fabrics produces lots of poisonous gases causing air pollution.

13.

4Rs stand for Reduce, Reuse, Recycle and Recover.

14.

Rayon is a man-made fibre which is prepared from wood pulp (natural material).

Multiple Choice Question

10 x 1 = 10

15.

16.

(a)
biodegradable

17.

18.

19.

(b)
Sodium

20.

(b)
Sulphur

21.

22.

(d)
PET

23.

(a)
Melamine

24.

(d)
polyester and cotton

True or False

5 x 1 = 5

25.

(b)
False

26.

(a)
False

27.

(b)
False

28.

(b)
False

29.

(a)
False

Fill up / 1 Marks

4 x 1 = 4

30.

()
Aluminium foils

31.

()
synthetic, man-made

32.

()
glucose units

33.

()
more

Generic 5

2 x 5 = 10

34.

S.No	Metals	Non-Metals
1	Metals are good conductors of heat and electricity	Non-metals are poor conductors of heat and electricity
2	Metals are malleable and ductile.	Non-metals are neither malleable nor ductile
3	Metals are lustrous and can be polished	Non-metals are nonlustrous and cannot be polished
4	Metals are solids except mercury	Non-metals can exist in all states.
5	Metals have generally high melting and boiling points	Non-metals generally have low melting and boiling points.

35.

(a) Firstly, gold is highly malleable and ductile. Secondly, it is not attacked by the gases of air.
(b) We prefer copper wire because it is the better electrical conductor than aluminium. However, silver is the best electrical conductor but it is very expensive.
(c) Silver is the better conductor of heat than copper.
(d) Yes, they are harmful for us because they affect throat and lungs.

Match the following

4 x 1 = 4

36.