Question 1

What is the term for the minimum temperature at which a combustible substance catches fire?

Accepted Answer

Ignition temperature

Answer

Supporter of combustion

Answer

Slow combustion

Answer

Inflammable substance

Question 2

Which of the following is an example of an inflammable substance?

Accepted Answer

Petrol

Answer

Coal

Answer

Wood

Answer

Sugar

Question 3

What type of combustion occurs when a substance catches fire without an external heat source?

Accepted Answer

Spontaneous combustion

Answer

Rapid combustion

Answer

Slow combustion

Answer

Controlled combustion

Question 4

In which type of combustion is fuel burned slowly, resulting in the production of smoke?

Accepted Answer

Slow combustion

Answer

Rapid combustion

Answer

Spontaneous combustion

Answer

Complete combustion

Question 5

Which of the following statements is true regarding ignition temperature?

Accepted Answer

No combustible substance catches fire below its ignition temperature.

Answer

Ignition temperature is only relevant for gases.

Answer

All substances ignite at the same temperature.

Answer

Ignition temperature varies with the size of the substance.

Question 6

What is the supporter of combustion that is essential for most combustion reactions?

Accepted Answer

Oxygen

Answer

Hydrogen

Answer

Carbon Dioxide

Answer

Nitrogen

Question 7

What is a characteristic of rapid combustion?

Accepted Answer

It produces a large amount of heat and light in a short time.

Answer

It occurs at a slow speed and produces smoke.

Answer

It takes a long time for the fuel to burn completely.

Answer

It happens without the presence of oxygen.

Question 8

Which of the following is NOT a type of combustion?

Accepted Answer

Chemical combustion

Answer

Spontaneous combustion

Answer

Slow combustion

Answer

Rapid combustion

Question 9

Which of the following examples represents slow combustion?

Accepted Answer

Digestion in the human body

Answer

White phosphorus catching fire

Answer

Burning of a candle

Answer

Burning of LPG in a stove

Question 10

What happens to a combustible substance when it reaches its ignition temperature?

Accepted Answer

It catches fire and begins burning.

Answer

It transforms into a non-combustible material.

Answer

It becomes a gas.

Answer

It cools down and stops burning.

Question 11

What is a supporter of combustion?

Accepted Answer

A substance that helps in the combustion of a combustible substance.

Answer

A substance that prevents combustion.

Answer

A type of fire extinguisher.

Answer

A device that measures temperature.

Question 12

What is the ignition temperature of a substance?

Accepted Answer

The minimum temperature at which a combustible substance catches fire.

Answer

The maximum temperature a substance can reach before burning.

Answer

The temperature at which a substance melts.

Answer

The temperature at which a substance starts to cool down.

Question 13

Which of the following is an example of spontaneous combustion?

Accepted Answer

White phosphorus catching fire at room temperature.

Answer

A candle burning slowly.

Answer

Burning wood in a fireplace.

Answer

LPG burning in a gas stove.

Question 14

What type of combustion occurs when a substance burns slowly and produces smoke?

Accepted Answer

Slow combustion

Answer

Complete combustion

Answer

Rapid combustion

Answer

Spontaneous combustion

Question 15

Which of the following substances is considered inflammable?

Accepted Answer

Petrol

Answer

Iron

Answer

Wood

Answer

Glass

Question 16

What is the main characteristic of rapid combustion?

Accepted Answer

It occurs in a short span of time and produces a lot of heat and light.

Answer

It does not produce heat or light.

Answer

It takes a long time to burn.

Answer

It always results in smoke and ash.

Question 17

What is the result of removing a supporter of combustion from a fire?

Accepted Answer

The fire will be extinguished.

Answer

The fire will spread faster.

Answer

The fire will burn brighter.

Answer

The fire will produce more smoke.

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