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COMBUSTION AND FLAME

Total questions: 40

Worksheet time: 30mins

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 type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?
a)
Water
b)
Carbon Dioxide 
c)
Dry Chemical
d)
Foam
22.
Water is not used to control fires involving electrical appliances.
a)
False
b)
True
23.
Which of the following fuel has highest calorific value?
a)
Wood
b)
coal
c)
Hydrogen
d)
petrol
24.
What is produced when combustable substance is in the vapour state and burn strongly in the presence of of air?
a)
heat 
b)
light
c)
flame
d)
fumes
25.
The three sides to the fire triangle are;
a)
Petrol, Spark, Oxygen
b)
Heat, Fuel, Oxygen
c)
Heat, Paper, Air
d)
Match, Paper, Air
26.

8.7: Combustion is when a __________ reacts with oxygen

a)

petrol

b)

fuel

c)

fire triangle

d)

carbon dioxide

27.

Which poisonous gas is formed as a result of incomplete combustion?

a)

nitrogen oxide

b)

carbon monoxide

c)

Carbon dioxide

d)

coal gas

28.

The picture below shows two cases in which a person is trying to burn the paper cup. In case 1, the cup has water in it and in case 2, it is empty and dry. Identify in which of the cases the paper will burn.

a)

Case 1

b)

case 2

c)

Both case 1 and case 2

d)

The paper doesn’t burn in both the cases.

29.

Ideal fuel has ____________ calorific value

a)

Zero

b)

Low

c)

Moderate

d)

High

30.

Moderately hot zone in a candle flame

a)

outer zone

b)

middle zone

c)

innermost zone

d)

wax candle

31.
In which form the colfloric value represent?
a)
(kJ/kg)
b)
gram
c)
kilogram 
d)
both 1 & 3
32.
Are the molecules in wood the same as ash 
a)
yes 
b)
depends 
c)
does it matter 
d)
no
33.
The condition which are required for combustion to take place are:
a)
fuel
b)
ignition temperature
c)
oxygen
d)
all of these
34.
Another term for burning is
a)
Fire triangle
b)
Magnesium oxide
c)
Combustion
d)
Bustion
35.

Burning of charcoal in a closed room will produce

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Carbon monoxide

d)

Sulphur dioxide

36.

Ignition temperature is

a)

Lowest temperature at which a substance catches fire

b)

Highest temperature at which a substance catches fire

c)

Any temperature

d)

1000 C

37.

Combustion is a

a)

Natural process

b)

Chemical process

c)

Physical process

d)

None of these processes

38.

When a magnesium ribbon is burnt, it produces

a)

Magnesium hydroxide

b)

Magnesium oxide

c)

Magnesium chloride

d)

Magnesium sulphate

39.

Which one of the following is combustible?

a)

Iron nail

b)

Glass

c)

Stone pieces

d)

Paper

40.

Fuel may be

a)

Solid

b)

Liquid

c)

Gas

d)

All of the three

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