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Revision Class 8

Total questions: 85

Worksheet time: 42mins

Name
Class
Date
1.

pick the synthetic fibre out of the following

a)

spandex

b)

nylon

c)

both 1 and 2

d)

all

2.
which of the following is the source of rayon?
a)
wool
b)
PET
c)
wood pulp 
d)
silk
3.

polycot is obtained by mixing

a)

polythene and wool

b)

pvc and wool

c)

poly sodium carbonate and cotton

d)

polyester and cotton

4.
the material similar to silk in appearance is
a)
nylon
b)
rayon
c)
polyester
d)
terylene
5.

Which is the strongest among these

a)

Nylon

b)

Rayon

c)

Spider Silk

d)

Steel

6.

The first man made fibre

a)

Rayon

b)

Nylon

c)

Acrylic

d)

None of these

7.

The Nylon is prepared first in

a)

1926

b)

1935

c)

1945

d)

1956

8.

Various Types of Nylons are

a)

Nylon 6-10

b)

Nylon 2-3

c)

Nylon 99

d)

Nylon 5-11

9.

Rayon

1) Absorbs little water

2) Rayon is artificial fibre made from natural materials

a)

Option 1 is True and 2 False

b)

Option 1 False and 2 True

c)

Both options are correct and option 2 is the explanation for option 1

d)

Both options 1 and 2 are false

10.

Jute is obtained by

a)

retting

b)

nibbling

c)

gyroxing

d)

chemical treatment

11.

Cotton clothes are light weight and breathable. They are preferred during summer. Select the incorrect option.

a)

a plant fiber

b)

it is a form of monomer named glucose

c)

it is wrinkle free

d)

it absorbs sweat

12.

The raw material for making nylon is

a)

Cellulose

b)

Wood pulp

c)

Coal air water

d)

None of these

13.

Choose the odd one out.

a)

Nylon

b)

Rayon

c)

Silk

d)

Acrylic

14.

Which fabric would be best used for hotter climates or in the summer?

a)

Silk

b)

Cotton

c)

Nylon

d)

Polyester

15.

Which one of these isnt a property of synthetic fibres?

a)

absorbent

b)

lightweight

c)

strong

d)

less expensive

16.

Which is the correct statement about nylon?

a)

It is a natural fibre

b)

It is obtained from cellulose

c)

It is a strong fibre

d)

it is a mixture of polyester and cotton

17.

Acrylic fiber is

a)

is man made fiber

b)

it is soft and light weight

c)

it is artificial wool

d)

All of the above

18.

____________ is a chain of small units joined together.

a)

Natural

b)

monomer

c)

Cotton

d)

polymer

19.

Polymer of glucose is

a)

Polyester

b)

Polymer

c)

Cellulose

d)

Acrylic

20.

In Polymer , The word poly & Mer means ?

a)

Some & full

b)

Polythene & many

c)

Many & unit

d)

Unit & some

21.

polycot is obtained by mixing

a)

nylon and wool

b)

polyester and wool

c)

nylon and cotton

d)

polyester and cotton

22.

the material which is commonly used for making kitchen containers is

a)

PVC

b)

acrylic

c)

teflon

d)

PET

23.

What are some advantages of synthetic materials?

a)

Cheaper to manufacture

b)

Stronger than similar products made from natural material

c)

Often better quality

d)

All of the above

24.

It is not advisable to wear clothes made of synthetic fibre while working near fire because

a)

They are uncomfortable in those works

b)

They melt on heating and cause heavy burns

c)

They do not absorb moisture

d)

They are shiny and lustrous.

25.
What is the difference between a natural and synthetic material?
a)
Natural material is made from chemicals and synthetic is made from nature
b)
Natural material is made directly from nature and synthetic material is made from chemicals
c)
Natural material is made from petroleum and synthetic material is made from wool
d)
Natural material is made from trees and synthetic materials are made from plastics
26.

Which substance give heat and light after combustion

a)

Flame

b)

Fuel

c)

Combustion

d)

None of these

27.

Coal burns with ____________________________

a)

Flame

b)

Only glow

c)

Both flame and glow

d)

None of these

28.

Burning of charcoal in a closed room will produce

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Carbon monoxide

d)

Sulphur dioxide

29.

The substances which have very low ignition temperature will

a)

Catch fire easily

b)

Will not catch fire

c)

Catch fire after some time

d)

None of these

30.

Ignition temperature is

a)

Lowest temperature at catch fire

b)

Higher temperature at catch fire

c)

Any temperature

d)

1000 C

31.

Combustion is a

a)

Natural process

b)

Chemical process

c)

Physical process

d)

None of these processes

32.

When magnesium ribbon burnt it produce

a)

Magnesium hydroxide

b)

Magnesium oxide

c)

Magnesium chloride

d)

Magnesium sulphate

33.

Which one of the following is fuel of our body?

a)

Petrol

b)

Diesel

c)

Water

d)

Food

34.

Which one of the following is combustible?

a)

Iron nail

b)

Glass

c)

Stone pieces

d)

Paper

35.

In the presence of water, ignition Temperature of paper is-

a)

Decrease

b)

Increase

c)

Remain constant

d)

None of these

36.

Which of the following is inflammable Substances?

a)

Petrol

b)

Wood

c)

Paper

d)

Straw

37.

Fire extinguisher-

a)

Raise up temperature of fuel

b)

Bring down the temperature of fuel

c)

Cut off the supply of air

d)

None of these

38.

Which is the hottest part in the flame of the candle

a)

Red/Yellow zone

b)

Blue inner zone

c)

Black inner zone

d)

Blue outer zone

39.

Good fuel is

a)

Readily available

b)

Cheap

c)

Burn easily in air

d)

All of these

40.

Ideal fuel has ____________ calorific value

a)

Zero

b)

Low

c)

Moderate

d)

High

41.

For a fuel to produce a flame, it must-

a)

Dissolve

b)

Breakdown

c)

Melt

d)

Vaporize

42.

Common Fuel used in home isn’t-

a)

Hydrogen

b)

LPG

c)

Coal(Bituminous)

d)

Wax(Candles)

43.

How is the flame produced by a burning Magnesium ribbon

a)

Blue, Dull

b)

Yellow, Dull

c)

Green, Dazzling

d)

White, Dazzling

44.

Ideal Fuel among the following

a)

CNG

b)

Wood

c)

Hydrogen

d)

Gasoline

45.

Phosphorus is generally kept under kerosene

a)

True

b)

False

46.

Name the metal which is in liquid state.

a)

Iron

b)

Mercury

c)

Zinc

d)

Aluminium

47.

Metals are sonorous in nature. What is sonorous?

a)

Making into powder

b)

Drawn into wires

c)

Make sound on beating

d)

None of these

48.

What does malleable mean?

a)

can be used for sheet making

b)

will break easily

c)

can be used for wire making

d)

is shiny

49.
What does ductile mean?
a)
electricity flows easily
b)
quacks like a duck
c)
can be drawn into a wire
d)
able to bend
50.

A type of rock that contains minerals and metals

a)

ore

b)

metal

c)

malleable

d)

gem

51.

Able to be drawn into wire is

a)

malleable

b)

insulator

c)

lustre

d)

ductile

52.

The approximate number of elements we know about today is .......

a)

108

b)

120

c)

118

d)

116

53.
Where are the non-metallic elements found in the periodic table?
a)
In the middle
b)
In the top rows
c)
On the left-hand side
d)
On the right-hand side
54.
Brittle
a)
Metal
b)
Nonmetal
55.
Sulfur
a)
Metal
b)
Nonmetal
56.
Good conductor of heat
a)
Metal
b)
Nonmetal
57.
zinc + hydrochloric acid ---->
a)
zinc chloride
b)
zinc chloride + hydrogen
c)
zinc chloride + oxygen
d)
zinc chlorine + hydrogen
58.
Brass is a mixture of 
a)
lead and tin 
b)
copper and zinc 
c)
copper and tin 
59.

A metal which occur in free state

a)

gold

b)

zinc

c)

lead

d)

calcium

60.

Which of the following is a metal?

a)

chlorine

b)

sodium

c)

Oxygen

d)

phosphorus

61.

Pb is a heavy metal. It is one of the most densest metals of all. Out of the following, which is a use of Al

a)

Automobile Batteries

b)

Leaded Petroleum

c)

Wires

d)

Soldering Equipment

62.

Metals are sonorous, conductors, have high tensile strength are stronger than non metals, are malleable and ductile. What is the properties of non-metals?

a)

Malleable

b)

Brittle

c)

Conducting

d)

Sonorous

63.

Which isn't a neutral compound of Nitrogen?

a)

Nitrous Oxide

b)

Nitric oxide

c)

Nitrogen Dioxide

64.

what is eka-aluminum

a)

Germanium

b)

Silicon

c)

Gallium

d)

Antimony

65.

How many Blocks of elements are there in the PT

a)

3

b)

7

c)

18

d)

4

66.

Which among the following is the cleanest fuel

a)

Coal

b)

Petrol

c)

Diesel

d)

CNG

67.

Which coal produces the lowest amount of heat

a)

Lignite

b)

Peat

c)

Anthracite

d)

Bituminous Coal

68.

Burning of which of the following fuels produce the least amount of carbon dioxide per unit of energy

a)

Coal

b)

Oil

c)

Natural gas

d)

All of these produce same amount of CO2

69.

Which of these are inexhaustible natural resources

a)

Sunlight

b)

Coal

c)

Wildlife

d)

Forest/ Minerals

70.

Ointments, candles,Vaseline etc. are made up of

a)

Lubricating Oil

b)

Petrol

c)

LPG

d)

Paraffin wax

71.

A gas which is found along with petroleum

a)

Carbon dioxide

b)

Water gas

c)

Natural gas

d)

Producer gas

72.

Which of the following fuels is the least polluting

a)

Coal

b)

CNG

c)

Diesel

d)

Petrol

73.

Which of the following fuels leaves a residue on burning

a)

LPG

b)

CNG

c)

Coal

d)

Petrol

74.

The first oil well was drilled in

a)

USA

b)

UK

c)

India

d)

Iran

75.

Full form of LPG

a)

Light petroleum gas

b)

Liquified petroleum gas

c)

Long pipe of gas

d)

Liquified petrol gas

76.

Which of the following is a pair of exhaustible natural resources

a)

Coal and soil

b)

Air and petroleum

c)

Air and sunlight

d)

Wild life and minerals

77.

Various material which are obtained from nature are called natural resources.Which of the following is not a natural resource

a)

Minerals

b)

Water

c)

Soil

d)

Plastic

78.

Coal is processed in industries to get some useful products.Which of the following is not obtained from coal

a)

Coke

b)

Coal gas

c)

Coal tar

d)

CNG

79.

Naphthalene balls are obtained from coal tar and are used as

a)

Honey bee repellent

b)

Moth repellent

c)

Snake repellent

d)

Mosquito repellent

80.

Choose the correct statement from the following

a)

it is difficult to transport natural gas through pipes

b)

the disadvantage of natural gas is that it cannot be used directly for burning in homes

c)

Natural gas is stored under high pressure as compressed natural gas

d)

Natural gas cannot be used for power generation

81.

Petroleum was formed from organisms

a)

living on the land

b)

living in the sea

c)

living on the plants

d)

living on the rocks

82.

Which substance is formed by the carbonisation of dead vegetation

a)

Coal

b)

Coal gas

c)

Coke

d)

Coal tar

83.

Which of the following is not a constituent of petroleum

a)

Paraffin wax

b)

Petrol

c)

Lubricating oil

d)

Coke

84.

Fossil fuels are obtained from

a)

remains of non - living materials

b)

dead remains of birds only

c)

dead remains of insects only

d)

dead remains of living organisms

85.

Name the petroleum product used for surfacing of roads

a)

Butane

b)

Anthracite

c)

Bitumen

d)

Hydrocarbon

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