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Published on: 29/10/2025
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Questions + Answers key
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1.
________ is the rise in temperature of the atmosphere of the earth.
2.
Incomplete combustion of a fuel gives poisonous _________ gas.
3.
Fuels differ in their _______ and _______.
4.
________ is commonly used to control fire.
5.
________________is essential for combustion.
6.
_____________is expressed in terms of its calorific value.
7.
A device used to extinguish fire is called a _____________________
8.
The type of combustion in which any substance starts to burn on its own is called_________________combustion.
9.
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its___________________
10.
Ignition temperature of __________________is lower than that of wood
11.
The lowest temperature at which a substance catches fire is called its _________________temperature.
12.
Wood paper and CNG are _____________substances
13.
The substances which vaporise during______________ give flame
14.
The substances which gave very ___________ignition temperature and can easily catch fire with a flame are called ____________substances.
15.
When the clothes of a person catch _______________the person is covered with a ___________to extinguish fire.
16.
A ____________process in which a substance reacts with_________ to give off heat is called combustion.
17.
Fire produced by oil cannot be controlled by ________________
18.
Fuel must be heated to its before _____________it starts burning
19.
A liquid fuel, used in homes is___________
20.
Burning of wood and coal causes___________ of air.
21.
Choose the incorrect statement from the following: A good fuel is one which:
is readily available
produces a large amount of heat
leaves behind many undesirable substances
burns easily in air at a moderate rate.
22.
Choose the correct statement about inflammable substance from the following:
low ignition temperature and can catch fire easily
high ignition temperature and can catch fire easily
low ignition temperature and cannot catch fire easily
high ignition temperature and cannot catch fire easily
23.
Shyam was cooking potato curry on a chulha. To his surprise. he observed that the copper vessel was getting blackened from outside. It may be due to
proper combustion of fuel
improper cooking of potato curry
improper combustion of the fuel
burning of copper vessel
24.
The product(s) of combustion is/are
only oxygen
oxygen and water
carbon dioxide and water
only carbon dioxide
25.
Coal burns with
flame
only glow
Both flame and glow
None of these
26.
Combustion is generally
a physical process
a chemical process
Both(a) and (b)
None of these
27.
Which one among the following is considered as the cleanest fuel?
Cowdung cake
Petrol
Kerosen
Hydrogen gas
28.
In villages people use wood as fuel because
it is considered to be an ideal fuel
of its easy availability and low cost
it is environment friendly
it catches fire easily
29.
The calorific value of a fuel is expressed in a unit called
kilojoule per litre
kilogram per millilitre
kilojoule per gram
kilojoule per kilogram
30.
Choose the incorrect statement from the following. Forest fires are usually due to
carelessness of humans
heat of Sun
cutting of trees
lightning strike
31.
The substance expected to have the highest ignition temperature out of the following is
kerosene
petrol
coal
alcohol
32.
If a person's clothes catch fire. The best way to extinguish the fire is to
throw water on the clothes
use fire extinguisher
cover the person with a woolen blanket
cover the person with a polythene sheet
33.
On placing an inverted tumbler over a burning candle. the flame extinguishes after sometime. This is because of non-availability of
oxygen
water vapours
carbon dioxide
wax
34.
The substance that does not burn with flame is
LPG
camphor
dry grass
charcoal
35.
Which of the following is not a combustible substance?
Camphor
Glass
Straw
Alcohol
36.
Magnesium ribbon on burning in air produces
magnesium oxide, water and light
magnesium oxide and heat
magnesium oxide, heat and light
magnesium oxide, water and heat
37.
Which one of the following has the highest calorific value?
Kerosene
Biogas
LPG
Petrol
38.
A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?
Iron nail
Glass
Stone piece
Wood
39.
The substances which vaporize during burning, give flame.
40.
Increased concentration of nitrogen in air is believed to cause global warming.
41.
The fuel can be in solid, liquid or in gaseous form.
42.
Sun produces heat and light due to nuclear reactions
43.
Food is a fuel for our body.
44.
The substances which vaporise during buming give flame.
45.
Middle zone is the hottest zone of a flame.
46.
Greater the calorific value. better is the fuel.
47.
Alcohol, CNG and LPG are inflammable substances.
48.
Water is the best extinguisher for fires involving electrical equipment.
49.
A physical process in which a substance reacts with oxygen to give off heat is called combustion.
50.
Calorific value of wood is higher than that of coal.
51.
Carbon dioxide is an excellent fire extinguisher
52.
Magnesium is a non-combustible metal
53.
Air is necessary for combustion
54.
least hot
55.
moderately hot
56.
hottest part
57.
Wood
58.
Candle
59.
Iron nails
60.
LPG
61.
Carbon monoxide
62.
Carbon dioxide
63.
Inflammable substance
64.
Oxygen
65.
CNG
66.
Oxides of sulphur and nitrogen
67.
What is the principle to extinguish fire?
68.
How is carbon monoxide gas formed?
69.
What is calorific value?
70.
What is global warming?
71.
Who helps us when a building or an area catches fire?
72.
Define inflammable substance.
73.
What is the composition of a match-stick?
74.
Name different zones of flame.
75.
Define ignition temperature.
76.
What happens when charcoal burns in the air?
77.
Name two combustible substances.
78.
What is combustion?
1.
( )
Global warming
2.
( )
carbon monoxide
3.
( )
Efficiency, cost
4.
( )
Water
5.
( )
Oxygen or air
6.
( )
Fuel efficiency
7.
( )
fire extinguisher
8.
( )
spontaneous
9.
( )
calorific value
10.
( )
petrol
11.
( )
ignition
12.
( )
combustible
13.
( )
burning
14.
( )
low, inflammable
15.
( )
fire, blanket
16.
( )
chemical, oxygen
17.
( )
water
18.
( )
ignition temperature
19.
( )
kerosene
20.
( )
pollution
21.
(b)
produces a large amount of heat
22.
(c)
low ignition temperature and cannot catch fire easily
23.
(c)
improper combustion of the fuel
24.
(c)
carbon dioxide and water
25.
(b)
only glow
26.
(b)
a chemical process
27.
(d)
Hydrogen gas
28.
(b)
of its easy availability and low cost
29.
(d)
kilojoule per kilogram
30.
(c)
cutting of trees
31.
(c)
coal
32.
(c)
cover the person with a woolen blanket
33.
(a)
oxygen
34.
(d)
charcoal
35.
(d)
Alcohol
36.
(c)
magnesium oxide, heat and light
37.
(c)
LPG
38.
(d)
Wood
39.
(a)
40.
(b)
41.
(a)
42.
(a)
43.
(a)
44.
(a)
45.
(b)
46.
(a)
47.
(a)
48.
(b)
49.
(b)
50.
(b)
51.
(a)
52.
(b)
53.
(a)
54.
( )
innermost zone of unburnt wax vapours - black
55.
( )
middle zone of partial combustion - yellow
56.
( )
outer zone of complete combustion - blue
57.
( )
Deforestation
58.
( )
Flame
59.
( )
Non-combustible
60.
( )
Cooking gas
61.
( )
Incomplete combustion of coal
62.
( )
Fire extinguisher
63.
( )
Very low ignition temperature
64.
( )
Necessary for combustion
65.
( )
Fuel for automobiles
66.
( )
Acid rain
67.
( )
Fire can be controlled by removing one or more of the requirements - air, fuel or heat.
68.
( )
Incomplete combustion of any fuel is responsible for the formation of carbon monoxide gas.
69.
( )
The amount of heat energy produced on complete combustion of 1kg of a fuel is called its calorific value.
70.
( )
The rise in temperature of the atmosphere of the earth due to increased concentration of carbon dioxide in the air is called global warming.
71.
( )
Fire brigade helps to extinguish the fire in an area or a building.
72.
( )
The substance that has very low ignition temperature and can easily catch fire with a flame is called inflammable substance.
73.
( )
A mixture of antimony trisulphide, potassium chlorate and white phosphorous with some glue and starch applied on the head of the match stick.
74.
( )
Three zones of a flame are :
(i) Non-luminous zone.
(ii) Luminous zone.
(iii) Dark zone.
75.
( )
The lowest temperature at which a substance catches fire is called its ignition temperature.
76.
( )
Charcoal bums in air producing carbon dioxide, heat and light.
77.
( )
78.
( )
A chemical process in which a substance burns in the presence of oxygen to release heat is called combustion.
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