Combustion Quiz

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Which of the following best defines combustion?

The conversion of substances into solid state in the presence of oxygen
The process of freezing substances in the presence of oxygen
The reaction where substances give off heat and light in the presence of oxygen (correct)
The process of boiling substances in the presence of oxygen

What distinguishes combustible substances from non-combustible substances?

Capability to catch fire and burn (correct)
Density of the substances
Color of the substances
Ability to conduct electricity

Why is it more difficult to burn some combustible substances than others?

They have a higher boiling point
They are denser in nature
They are transparent to light
They have a lower ignition temperature (correct)

What are the conditions required for combustion of a fuel?

Presence of a combustible substance, air, and heat (A) Signup and view all the answers

Why is more care needed to store kerosene than coal, though both are fuels?

Kerosene evaporates more easily than coal (A) Signup and view all the answers

The ______ of substances in the presence of oxygen gives off heat and light, which is known as combustion

burning Signup and view all the answers

Distinguish between ______ and non-combustible substances, giving three examples of each.

combustible Signup and view all the answers

It is more difficult to ______ some combustible substances than others because different substances catch fire at different temperatures.

burn Signup and view all the answers

State the conditions under which ______ occurs.

combustion Signup and view all the answers

Why is more care needed to store kerosene than coal, though both are ______.

fuels Signup and view all the answers

Why is more care needed to store kerosene than coal, though both are fuels?

More care is needed to store kerosene than coal because kerosene is a liquid fuel and highly flammable, whereas coal is a solid fuel and less prone to accidental ignition. Signup and view all the answers

What is combustion?

The burning of substances in the presence of oxygen gives off heat and light, which is known as combustion. Signup and view all the answers

Distinguish between combustible and non-combustible substances, giving three examples of each.

Combustible Substances: 1. The substances that are capable of catching fire and burning are known as combustible substances. 2. Examples: Coal, petrol, diesel, etc. Non-combustible Substances: 1. The substances that are not capable of catching fire and burning are known as non-combustible substances. 2. Examples: Stone, water, etc. Signup and view all the answers

Why is it more difficult to burn some combustible substances than others?

It is more difficult to burn some combustible substances than others because different substances catch fire at different temperatures. Some substances have a low ignition temperature, therefore, they can catch fire more easily than others. Ignition temperature plays a crucial role in determining the combustibility of different substances. Signup and view all the answers

State the conditions under which combustion occurs.

Combustion of a fuel requires: Presence of a combustible substance such as coal, natural gas, wood, etc. Presence of air to supply oxygen Availability of heat to raise the temperature of the fuel beyond its ignition temperature Signup and view all the answers