Class Notes NCERT Solutions for CBSE Students
NCERT 8th Class (CBSE) Science: Combustion and Flame – Quiz
32 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Combustion and Flame – Quiz:
- Combustion is the process in which a substance burns in air or oxygen to produce heat and light.
- When a hydrocarbon fuel is burnt in a sufficient supply of air, carbon dioxide and water are produced. If the supply of air is insufficient, carbon monoxide is produced instead of carbon dioxide.
- The lowest temperature at which a combustion substance starts burning in the presence of air is called its ignition temperature.
- Conditions necessary for combustion are: presence of a combustible substance, presence of a supporter of combustion and heating of the combustible substance to its ignition temperature.
Quiz: Combustion and Flame
The process of burning of substances in air or oxygen with the evolution of heat and light is known as combustion. A substance that burns in air or oxygen to produce heat and light is called combustible substance, e.g., paper, wood, kerosene, LPG. A Substance that does not burn in air or oxygen is called a non-combustible substance, e.g. stone, metal. Combustible substance that can be used to produce heat at a reasonable cost is called a fuel. Fuels are mostly made up of hydrocarbons, i.e., substances made up of carbon and hydrogen only. When a hydrocarbon burns completely, the products formed are carbon dioxide and water. Heat and light energy are released.
- Question 1 of 32
1.
Good fuels have
Correct
Wrong! Correct Answer is Low ignition temperature and high calorific value.
- Question 2 of 32
2.
Calorific value of a fuel is the heat energy produced when
Correct
Wrong! Correct Answer is One kilogram of the fuel is completely burnt.
- Question 3 of 32
3.
Which poisonous gas is formed as a result of incomplete combustion?
Correct
Wrong! Correct Answer is Carbon monoxide
- Question 4 of 32
4.
Acid rain can be caused by the burning of
Correct
Wrong! Correct Answer is Coal
- Question 5 of 32
5.
To extinguish a flame, which of these methods can be used?
Correct
Wrong! Correct Answer is Any one of these
- Question 6 of 32
6.
The hottest zone of a candle flame is
Correct
Wrong! Correct Answer is Non-luminous zone
- Question 7 of 32
7.
Which of these is a solid pollutant?
Correct
Wrong! Correct Answer is SPM
- Question 8 of 32
8.
Which of these fuels has the highest calorific value?
Correct
Wrong! Correct Answer is Hydrogen
- Question 9 of 32
9.
Which of these is a combustible substance?
Correct
Wrong! Correct Answer is Paper
- Question 10 of 32
10.
Which of the following is non-combustible substance?
Correct
Wrong! Correct Answer is Iron
- Question 11 of 32
11.
Which of the following is an inflammatory substance?
Correct
Wrong! Correct Answer is Alcohol
- Question 12 of 32
12.
A flame has how many zones?
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Wrong! Correct Answer is Three
- Question 13 of 32
13.
The outermost zone of flame is of which colour?
Correct
Wrong! Correct Answer is Blue
- Question 14 of 32
14.
The middle zone of flame is of which colour?
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Wrong! Correct Answer is Orange
- Question 15 of 32
15.
Which is the best fuel for kitchen; in present times?
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Wrong! Correct Answer is LPG
- Question 16 of 32
16.
Which part of flame is used by goldsmith?
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Wrong! Correct Answer is Blue
- Question 17 of 32
17.
Which of the following does not produce flame while burning?
Correct
Wrong! Correct Answer is Coal
- Question 18 of 32
18.
Substances we can burn to get energy are called:
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Wrong! Correct Answer is Fuels
- Question 19 of 32
19.
Substances which catch fire are called:
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Wrong! Correct Answer is Combustible
- Question 20 of 32
20.
Chemical process in which a substance reacts with oxygen to give off heat is called:
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Wrong! Correct Answer is Combustion
- Question 21 of 32
21.
______________ is also given off during combustion.
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Wrong! Correct Answer is Light
- Question 22 of 32
22.
_______________ is necessary for the process of combustion.
Correct
Wrong! Correct Answer is Oxygen
- Question 23 of 32
23.
Sun produces heat and light through:
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Wrong! Correct Answer is Nuclear reactions
- Question 24 of 32
24.
We use _____________ to wrap around a person who has caught fire.
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Wrong! Correct Answer is Blanket
- Question 25 of 32
25.
The lowest temperature at which a substance catches fire is:
Correct
Wrong! Correct Answer is Ignition temperature
- Question 26 of 32
26.
Charcoal burns with a:
Correct
Wrong! Correct Answer is Glow
- Question 27 of 32
27.
_______________ is poured to extinguish the burning wood.
Correct
Wrong! Correct Answer is Water
- Question 28 of 32
28.
The substance which have very low ignition temperature will:
Correct
Wrong! Correct Answer is Catch fire easily
- Question 29 of 32
29.
___________ cannot control fire due to oils.
Correct
Wrong! Correct Answer is Water
- Question 30 of 32
30.
Water ____________ to control fire.
Correct
Wrong! Correct Answer is Reduces temperature
- Question 31 of 32
31.
Sand _______ to control fire.
Correct
Wrong! Correct Answer is Cuts off air supply
- Question 32 of 32
32.
Burning coal in a closed room will produce:
Correct
Wrong! Correct Answer is Carbon monoxide
