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Combustion and Flame

Total questions: 50

Worksheet time: 33mins

Name
Class
Date
1.

Combustion is a reaction in which a substance reacts with

a)

hydrogen

b)

Nitrogen

c)

Oxygen

d)

Chlorine

2.

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

3.

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

4.

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

5.

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

6.

Which of the following is inflammable Substances?

a)

Petrol

b)

Wood

c)

Paper

d)

Straw

7.

Which is the hottest part in the flame of the candle

a)

Yellow

b)

Wax part

c)

Black

d)

Blue

8.

Good fuel is

a)

Readily available

b)

Cheap

c)

Burn easily in air

d)

All of these

9.

Ideal fuel has ____________ calorific value

a)

Zero

b)

Low

c)

Moderate

d)

High

10.

The least hot zone of a candle flame is

a)

non-lumious zone

b)

luminous

c)

dark zone

d)

blue zone at the base of the wick

11.
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
12.
Water is not used to control fires involving electrical appliances.
a)
False
b)
True
13.
Which of the following fuel has highest calorific value?
a)
Wood
b)
coal
c)
Hydrogen
d)
petrol
14.

Moderately hot zone in a candle flame

a)

outer zone

b)

middle zone

c)

innermost zone

d)

wax candle

15.
what is the type of combustion 
which occurs rapidly and produce heat and light?
a)
rapid combustion
b)
spontaneous combustion
c)
fast combustion
d)
explosion
16.

When water is poured over burning wood, the fire goes off. This is because

a)

temperature of wood decreases

b)

temperature of water goes up

c)

molecules of water reacts with oxygen present in the flame

d)

the flame vapourises

17.

Fire is extinguished by

a)

removing all combustible substance

b)

cutting off supply of air

c)

cooling the burning substance

d)

all the these

18.

Which substance give heat and light after combustion

a)

Flame

b)

Fuel

c)

Combustion

d)

None of these

19.

Coal burns with ____________________________

a)

Flame

b)

Only glow

c)

Both flame and glow

d)

None of these

20.

Burning of charcoal in a closed room will produce

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Carbon monoxide

d)

Sulphur dioxide

21.

Name the most common fuel used in homes.

a)

Petrol

b)

Kerosene

c)

Liquified Petroleum Gas

d)

Wax

22.

What is the unit for expressing the calorific value of a fuel?

a)

m/sec

b)

KJ/Kg

c)

Kg/Kj

d)

Kg

23.

Does magnesium produce heat and light during its combustion?

a)

True

b)

False

24.

Identify the luminous zone in the given picture

a)

A

b)

C

c)

B

d)

None

25.

Combustion is a

a)

Chemical process

b)

Physical process

c)

Both of these processes

d)

None of these processes

26.

The products of combustion are

a)

Carbon dioxide and water

b)

Oxygen and water

c)

Only oxygen

d)

Only water

27.

Burning of charcoal in a closed room will produce

a)

Carbon dioxide

b)

Nitrogen

c)

Chlorine

d)

Carbon monoxide

28.

Which part of a flame does a goldsmith blow for melting gold and silver?

(a)  

29.

Burning of LPG is an example of

a)

Spontaneous

b)

Rapid

c)

Explosion

d)

None

30.

Why isn’t hydrogen gas used as a domestic or industrial fuel, although it has a very high calorific value?

a)

It is expensive

b)

It burns with an explosion

c)

Risky to store

d)

Low ignition temperature

31.

Why does a piece of paper burn with yellow flame?

a)

Very high ignition temperature

b)

Inadequate supply of oxygen

c)

Very low ignition temperature

d)

All of the above

32.

There are three factors which supports burning. Fire extinguisher affects which factor?

a)

All given below

b)

Supply of oxygen

c)

Supply of combustible substance

d)

Lower down the ignition temperature

33.

which fuels are used for running automobiles?

a)

wood

b)

coal

c)

diesel

d)

charcoal

34.

when magnesium ribbon burnt it produce

a)

magnesium hydroxide

b)

Magnesium oxide

c)

magnesium chloride

d)

magnesium sulphate

35.

CNG and LPG are the examples of

a)

Solid fuels

b)

Liquid Fuels

c)

Gaseous fuels

d)

they are not fuels

36.

there are following zones of a flame

a)

Two

b)

Three

c)

Four

d)

No any zone

37.

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


(Capitalize Each Word)

38.

Substance which can undergo combustion is called as ______________

a)

Combustible Substance

b)

Non-Combustible Substance

39.

Water cannot be used to extinguish fires in case of

a)

Electric Wiring

b)

Kerosene

c)

Petrol

d)

All of the above

40.

Fire in coal mines is an example of (a)   combustion.

41.

Give one condition Necessary for combustion

4 lines
42.

Substances that have low ignition temperature and can easily catch fire is called as (a)   substance

43.

Firefighting works on ___ principles

a)

2

b)

1

c)

3

d)

5

44.

Which of the following are the main principles firefighting works on?

a)

Bringing down the temparature of the burning susbstance below their ignition

b)

Cutting of CO2 supply

c)

Cutting of air supply to the burning substance

45.

When a combustible substance burns at a rapid rate producing a large amount of heat and light in a short period of time is called ____________ combustion

a)

Rapid

b)

Spontaneous

c)

Explosive

d)

Luminous

46.

When a combustible substance burns without help of any external heat source its called ______ Combustion

a)

Rapid

b)

Spontaneous

c)

Explosive

d)

Luminous

47.

Example of explosive combustion

a)

Firecrackers

b)

LPG

c)

Forest Fires

d)

Short Circuit

48.

A candle is made up of ________ ______.

(a)  

49.

Amount of heat energy produced on complete combustion is called as _________ __________.

(a)  

50.

Give one example of harmful products produced during combustion

4 lines

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