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class 8 Combustion and flame

Total questions: 95

Worksheet time: 1hrs 11mins

Name
Class
Date
1.

Coal burns with__________

a)

Flame

b)

Only Glow

c)

Both flame & glow

d)

None of these

2.

Combustion is a ____________

a)

Physical process

b)

Chemical process

c)

Both of these processes

d)

None of these

3.

CNG & LPG are examples of

a)

Solid fuels

b)

Liquid fuels

c)

Gaseous fuels

d)

They are not fuels

4.

There are following zones of flame

a)

Two

b)

Four

c)

Three

d)

No zone

5.

The substance which have very low ignition temperature will

a)

Catch fire easily

b)

Will not catch fire

c)

Catch fire after sometime

d)

None of these

6.

Burning of charcoal in room will produce

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Carbon monoxide

d)

All of these

7.

Substance which catch fire are called

a)

Acids

b)

Bases

c)

Burners

d)

Combustible

8.

The amount of heat energy produced on complete combustion of 1 kg of fuel is called

a)

Calorific value

b)

Significant value

c)

Heat value

d)

Internal value

9.

Which is non combustible substance?

a)

Wood

b)

Paper

c)

Straw

d)

Iron nails

10.

Essential requirements for producing fire are

a)

Fuel

b)

Air

c)

Heat

d)

All of these

11.

Which is the hottest part in flame of candle ?

a)

Blue (outer)

b)

Yellow (middle)

c)

Black (inner)

d)

Wax part

12.

Rapid combustion is

a)

When gas burns, it produces heat & light

b)

When material suddenly burst into flames

c)

When there is evolution of heat

d)

None of these

13.

Calorific value is measured in

a)

Kilo joules

b)

Kilo grams

c)

Kilo joules per kg

d)

Kilo metre

14.

Unburnt carbon particles causes

a)

Stomach infection

b)

Respiratory problems

c)

Brain infections

d)

Throat problems

15.

Global warming is caused due to ___________ concentration of CO2 in air

a)

Decreased

b)

Increased

c)

Both a & b

d)

None of these

16.

Substance that does not burn in air is

a)

Sand

b)

Kerosene

c)

Wood

d)

Diesel

17.

Which zone represent the partial (half) combustion in candle flame

a)

Outer zone

b)

Middle zone

c)

Inner zone

d)

Lower zone

18.

Cutting off trees at large scale leads to

a)

Deforestation

b)

Afforestation

c)

Reforestation

d)

Both deforestation & afforestation

19.

Bursting of crackers is an example of

a)

Rapid combustion

b)

spontaneous combustion

c)

Explosion

d)

All of these

20.

The acronym for putting out a fire using a fire extinguisher is PASS . What does PASS stands for

a)

Pull, aim, squeeze, spread

b)

Pul, accuracy, squeeze, spread

c)

Pin, aim, squeeze, sweep

d)

Pull, aim, squeeze, sweep

21.

Which substance give heat and light after combustion

a)

Flame

b)

Fuel

c)

Combustion

d)

None of these

22.

Coal burns with ____________________________

a)

Flame

b)

Only glow

c)

Both flame and glow

d)

None of these

23.

Burning of charcoal in a closed room will produce

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Carbon monoxide

d)

Sulphur dioxide

24.

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

25.

Ignition temperature is

a)

Lowest temperature at catch fire

b)

Higher temperature at catch fire

c)

Any temperature

d)

1000 C

26.

Combustion is a

a)

Natural process

b)

Chemical process

c)

Physical process

d)

None of these processes

27.

When magnesium ribbon burnt it produce

a)

Magnesium hydroxide

b)

Magnesium oxide

c)

Magnesium chloride

d)

Magnesium sulphate

28.

Which one of the following is fuel of our body?

a)

Petrol

b)

Diesel

c)

Water

d)

Food

29.

Which one of the following is combustible?

a)

Iron nail

b)

Glass

c)

Stone pieces

d)

Paper

30.

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

a)

Decrease

b)

Increase

c)

Remain constant

d)

None of these

31.

Which of the following is inflammable Substances?

a)

Petrol

b)

Wood

c)

Paper

d)

Straw

32.

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

33.

Which is the hottest part in the flame of the candle

a)

Yellow

b)

Wax part

c)

Black

d)

Blue

34.

Good fuel is

a)

Readily available

b)

Cheap

c)

Burn easily in air

d)

All of these

35.

Ideal fuel has ____________ calorific value

a)

Zero

b)

Low

c)

Moderate

d)

High

36.

which fuels are used for running automobiles?

a)

wood

b)

coal

c)

diesel

d)

charcoal

37.

when magnesium ribbon burnt it produce

a)

magnesium hydroxide

b)

Magnesium oxide

c)

magnesium chloride

d)

magnesium sulphate

38.

Charcoal burns in air producing

a)

CO2

b)

CO

c)

H2

d)

O2

39.

Combustion is a reaction in which a substance reacts with

a)

hydrogen

b)

Nitrogen

c)

Oxygen

d)

Chlorine

40.

Fuel may be

a)

Solid

b)

Liquid

c)

Gas

d)

All of the three

41.

Which one of the following is fuel of out body?

a)

Petrol

b)

Diesel

c)

Food

d)

Water

42.

Combustion is a

a)

Physical process

b)

Chemical process

c)

both A and B

d)

None of these

43.

Which substance give heat and light after combustion

a)

Flame

b)

Fuel

c)

Combustion

d)

None of these

44.

like fuel the sun also provides heat and light. the process taking place in the sun is called

a)

Combustion

b)

Nuclear Reaction

c)

Burning

d)

None of these

45.

Burning of charcoal in a closed room will produce

a)

Carbon dioxide

b)

Nitrogen DIoxide

c)

Carbon monoxide

d)

all of these.

46.

The substance 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

47.

CNG and LPG are the examples of

a)

Solid fuels

b)

Liquid Fuels

c)

Gaseous fuels

d)

they are not fuels

48.

The product of combustion are

a)

Carbon dioxide and water

b)

oxygen and water

c)

only carbon dioxide

d)

only oxygen

49.

there are following zones of a flame

a)

Two

b)

Three

c)

Four

d)

No any zone

50.

The suspended particles released by combustion of coal in air may lead to a health disease. selcet the correct option

a)

Goiter

b)

Arthritis

c)

Asthma

d)

Bone cancer

51.

What is the main chemical component present in striking surface of a matchbox?

a)

Potassium chlorate

b)

Phosphorus

c)

Potassium

d)

Graphite

52.

An ideal fuel is cheap, readily available, easily combustible and easy to transport. It has high calorific value. It does not produce gases or residues that pollute the environment. Based on the above statements which of the following is closest to being an ideal fuel?

a)

Compressed Natural Gas (CNG)

b)

Kerosene

c)

Petrol

d)

Coal

53.

When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion?

a)

Explosion

b)

Random combustion

c)

Rapid combustion

d)

Spontaneous combustion

54.

The combustion reaction which occurs on its own, without any external supply of heat is called as (a)  

55.

The efficiency of a fuel is expressed in terms of its (a)  

56.

Which substance give heat and light after combustion

a)

Flame

b)

Fuel

c)

Combustion

d)

None of these

57.

Coal burns with ____________________________

a)

Flame

b)

Only glow

c)

Both flame and glow

d)

None of these

58.

Burning of charcoal in a closed room will produce

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Carbon monoxide

d)

Sulphur dioxide

59.

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

60.

Ignition temperature is

a)

Lowest temperature at catch fire

b)

Higher temperature at catch fire

c)

Any temperature

d)

1000 C

61.

Combustion is a

a)

Natural process

b)

Chemical process

c)

Physical process

d)

None of these processes

62.

When magnesium ribbon burnt it produce

a)

Magnesium hydroxide

b)

Magnesium oxide

c)

Magnesium chloride

d)

Magnesium sulphate

63.

Which one of the following is fuel of our body?

a)

Petrol

b)

Diesel

c)

Water

d)

Food

64.

Which one of the following is combustible?

a)

Iron nail

b)

Glass

c)

Stone pieces

d)

Paper

65.

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

a)

Decrease

b)

Increase

c)

Remain constant

d)

None of these

66.

Which of the following is inflammable Substances?

a)

Petrol

b)

Wood

c)

Paper

d)

Straw

67.

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

68.

Which is the hottest part in the flame of the candle

a)

Yellow

b)

Wax part

c)

Black

d)

Blue

69.

Good fuel is

a)

Readily available

b)

Cheap

c)

Burn easily in air

d)

All of these

70.

Ideal fuel has ____________ calorific value

a)

Zero

b)

Low

c)

Moderate

d)

High

71.

ignition temperature is

a)

lowest temperature to catch fire

b)

higher temperature to catch fire

c)

any temperature

d)

none of these

72.

CNG and LPG are the examples of

a)

solid fuels

b)

liquid fuels

c)

gaseous fuels

d)

they are not fuels

73.

Which one of the following gases is used in combustion?

a)

hydrogen

b)

oxygen

c)

nitrogen

d)

carbon dioxide

74.

The burning of LPG is an example of

a)

rapid combustion

b)

spontaneous combustion

c)

slow combustion

d)

explosion

75.

Which of the following is not a fossil fuel?

a)

Petroleum

b)

Natural gas

c)

Coal

d)

Water gas

76.

the substances which have very low ignition temperature will

a)

catch fire easily

b)

will not catch fire

c)

catch fire after sometime

d)

none of these

77.

like fuels, the sun also provides heat and light. the process taking place in the sun is called

a)

all of these

b)

combustion

c)

nuclear process

d)

burning

78.

Which gas helps in the process of combustion?

a)

Cooking gas

b)

Nitrogen gas

c)

Oxygen gas

d)

Producer gas

79.

what type of fire is this

a)

home fire

b)

forest fire

c)

garbage fire

d)

none of these

80.

coal burns with

a)

flame

b)

only glow

c)

both glow and flame

d)

none of these

81.

the substance which give heat and light after combustion are called

a)

flame

b)

fuel

c)

combustion

d)

none of these

82.

fuel must be heated to its ____ before it starts burning

a)

ignition temperature

b)

heating temperature

c)

boiling temperature

d)

none of these

83.

combustion is a

a)

chemical process

b)

physical process

c)

both of these process

d)

none of these process

84.

burning of charcoal in a closed room will produce

a)

carbon dioxide

b)

nitrogen dioxide

c)

carbon monoxide

d)

all of these

85.

on the basis of the combustion, classify the substance

a)

combustible

b)

non-combustible

c)

both of these

d)

none of these

86.

Which of the following statement is not correct about carbon dioxide acting as a fire extinguisher for electrical fires ?

a)

(a) it is heavier than air

b)

(b) it is lighter than air

c)

(c) it is not combustible

d)

(d) it does not support combustion

87.

Fires in underground coal mines usually occur due to the :

a)

(a) explosive combustion

b)

(b) deliberate combustion

c)

(c) spontaneous combustion

d)

(d) rapid combustion

88.

The calorific value of a fuel is 150000 kJ/kg. This fuel is most likely to be :

a)

(a) biogas

b)

(b) methane

c)

(c) hydrogen gas

d)

(d) liquefied petroleum gas

89.

Which of the following burns without producing a flame ?

a)

(a) camphor

b)

(b) charcoal

c)

(c) cooking gas

d)

(d) kerosene

90.

Which of the following gas does not contribute to the formation of acid rain ?

a)

(a) nitrogen monoxide

b)

(b) carbon monoxide

c)

(c) sulphur dioxide

d)

(d) nitrogen dioxide

91.

If the clothes of a person working in the kitchen catch fire, then to extinguish the fire :

a)

(a) sand should be thrown over the burning clothes

b)

(b) water should be thrown over the burning clothes

c)

(c) polyester blanket should be used to cover the burning clothes

d)

(d) A blanket should be used to cover the burning clothes

92.

(a) A fuel must be heated to its (a)   before it starts burning.

93.

e) The amount of heat evolved when 1 kg of a fuel is burnt completely is called its (a)  

94.

Which zone of a candle flame is the hottest ?

a)

middle zone

b)

outer zone

c)

inner zone

d)

all zones

95.

(d) A liquid fuel used in homes is (a)  

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