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Class 8 Practice – Level 1 – Combustion and flame
Total questions: 40
1.
What is required for combustion to take place?
Fuel, oxygen, and heat
Fuel, nitrogen, and light
Water, oxygen, and heat
Fuel, water, and oxygen
None
2.
Which of the following is an example of rapid combustion?
Burning of a matchstick
The explosion of a firecracker
Rusting of iron
Decay of organic matter
None
3.
What is the ignition temperature of a substance?
The maximum temperature a substance can reach
The minimum temperature required to catch fire
The temperature of the sun
The average temperature of the Earth
None
4.
Which part of a candle flame is the hottest?
Dark inner zone
Bright outer zone
Blue outermost zone
Yellow middle zone
None
5.
How can a fire caused by petrol be extinguished?
Pouring water
Using sand or foam
Blowing air on it
Increasing the fuel supply
None
6.
Which of the following is an example of spontaneous combustion?
Coal burning in a furnace
A forest fire due to lightning
LPG burning in a stove
An electric bulb glowing
None
7.
Which of the following is not a fuel?
Wood
Coal
Iron
Kerosene
None
8.
What is the primary function of a fire extinguisher?
To add more fuel to the fire
To reduce heat
To remove oxygen or cool the fuel
To provide more oxygen to the fire
None
9.
What is the primary product formed during the combustion of carbon-based fuels?
Oxygen
Water
Carbon dioxide
Nitrogen
None
10.
Which part of the flame appears yellow?
Inner zone
Middle zone
Outer zone
Core
None
11.
Which of the following is not required for combustion?
Fuel
Oxygen
Heat
Nitrogen
None
12.
The fire triangle consists of:
Fuel, water, and oxygen
Fuel, heat, and oxygen
Water, nitrogen, and oxygen
Heat, carbon dioxide, and fuel
None
13.
Which of the following is a gaseous fuel?
Wood
LPG
Kerosene
Coal
None
14.
Which harmful gas is released when fuels are burned incompletely?
Oxygen
Nitrogen
Carbon monoxide
Hydrogen
None
15.
Which fire extinguisher is suitable for electrical fires?
Water
Sand
Foam
Carbon dioxide
None
16.
Which of the following types of combustion occurs instantly with the help of external heat?
Spontaneous combustion
Explosion
Rapid combustion
Slow combustion
None
17.
Which is an example of slow combustion?
Burning of coal in a furnace
Burning of a matchstick
Respiration in humans
The explosion of a firecracker
None
18.
Which of the following is considered a clean fuel?
Wood
Coal
Kerosene
LPG
None
19.
In which part of a candle flame does incomplete combustion occur?
Inner zone
Middle zone
Outer zone
All parts
None
20.
The substance that undergoes combustion is called:
Oxygen
Flame
Fuel
Ash
None
21.
Which of the following can be used to extinguish a wood fire?
Water
Kerosene
Petrol
Oil
None
22.
Which gas is released during the explosion of a firecracker?
Carbon dioxide
Hydrogen
Nitrogen
Carbon monoxide
None
23.
A substance with a high ignition temperature:
Catches fire easily
Requires more heat to catch fire
Does not burn at all
Burns without oxygen
None
24.
The blue part of the candle flame indicates:
Complete combustion
Incomplete combustion
No combustion
Absence of fuel
None
25.
Which of the following can break the fire triangle?
Adding more fuel
Increasing oxygen supply
Removing heat
None of the above
None
26.
Why shouldn’t water be used to extinguish an oil fire?
Water increases combustion
Oil floats on water, and the fire spreads
Water evaporates quickly
Oil dissolves in water
None
27.
Which of the following works by displacing oxygen from a fire?
Water
CO2 extinguisher
Sand
Foam
None
28.
Which gas is essential for combustion?
Nitrogen
Carbon dioxide
Oxygen
Helium
None
29.
Which of the following is a solid fuel?
Petrol
Wood
LPG
Kerosene
None
30.
Which part of a flame is the least hot?
Blue outer zone
Yellow middle zone
Dark inner zone
Entire flame
None
31.
How can the fire on a pan containing oil be put out safely?
Pour water over it
Use a wet cloth to cover it
Add more oil
Blow air on it
None
32.
Which fuel is commonly used in rural areas for cooking?
Coal
LPG
Wood
Petrol
None
33.
Which of the following gases contributes to the greenhouse effect during combustion?
Oxygen
Nitrogen
Carbon dioxide
Argon
None
34.
What is produced when a substance burns completely in air?
Oxygen
Carbon monoxide
Carbon dioxide and water vapor
Nitrogen
None
35.
Combustion is a process in which a substance reacts with:
Hydrogen
Nitrogen
Carbon dioxide
Oxygen
None
36.
The outermost part of a flame is:
The hottest
The coldest
The brightest
The darkest
None
37.
What should you do if a small fire starts in your home?
Add more fuel
Call for help and use a fire extinguisher
Run away immediately
Pour petrol to put out the fire
None
38.
Which of the following increases the combustion rate?
Reducing heat
Decreasing oxygen supply
Increasing oxygen supply
Decreasing fuel
None
39.
How does covering a fire with sand help extinguish it?
It increases the heat
It provides more oxygen
It cuts off the supply of oxygen
It cools the fire
None
40.
Which of the following helps control forest fires?
Adding more leaves
Blowing air on the fire
Using water or fire retardants
Letting the fire spread naturally
None
1 out of 40
Time's up
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