Match the items in Column A with the items in Column B. Column A Column B 1. Explosion a. The lowest temperature at which a substance catches fire 2. Rapid Combustion b. A large amount of heat and light energy are released in a short span of time 3. Spontaneous combustion c. Amount of heat energy produced on the complete combustion of 1 Kg of fuel 4. Calorific value d. A fuel that fulfils most of the requirements for a particular use 5. Ideal fuel e. A very fast combustion reaction, producing a large amount of heat, light and sound. 6. Ignition temperature f. Occurs without any help of external heat

1. An explosion is a rapid increase in volume and release of energy in an extreme manner, usually with the generation of high temperatures, sound and the release of gases. 2. Rapid combustion is a form of combustion in which large amounts of heat and light energy are released. 3. Spontaneous combustion is a type of combustion which occurs by self-heating (increase in temperature due to exothermic internal reactions), followed by thermal runaway self heating which rapidly accelerates to high temperatures and finally, autoignition. 4. The energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram. 5. An ideal fuel is cheap. An ideal fuel burns easily in the air at a moderate rate. It releases a large amount of energy. It should not leave behind any undesirable substances which can be harmful to us. 6. Ignition temperature is the minimum temperature at which a combustible substance such as air or gas, must be heated up prior to burning in the absence of any source of the heat. Column A Column B 1. Explosion e. A very fast combustion reaction, producing a large amount of heat, light and sound. 2. Rapid Combustion b. A large amount of heat and light energy are released in short span of time 3. Spontaneous combustion f. Occurs without any help of external heat 4. Calorific value c. Amount of heat energy produced on the complete combustion of 1 Kg of fuel 5. Ideal fuel d. A fuel that fulfils most of the requirements for a particular use 6. Ignition temperature a. The lowest temperature at which a substance catches fire

Acid rain is any form of precipitation that contains acidic components, such as sulphuric or nitric acid. It is caused by chemical reaction between oxides of sulphur and nitrogen released into the atmosphere by the industries, combines with water vapour present in the air forming nitric and sulphuric acid and comes as acid rain.

An explosion is a rapid increase in volume and release of energy in an extreme manner, usually with the generation of high temperatures, sound and the release of gases. or A violent expansion or bursting with noise.

The flame is a region where the burning or combustion of gaseous substances takes place. It is the visible part of the fire. It consists of oxygen, nitrogen, carbon dioxide, and water vapour. Light energy is released due to the combustion of fuel.

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Study Mate Science Class 8>Chapter 6 - Combustion and Flame>NUT Cracker>Q IV

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8th CBSE

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What is calorific value of CNG?

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Important Questions on Combustion and Flame

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8th CBSE

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Study Mate Science Class 8>Chapter 6 - Combustion and Flame>NUT Cracker>Q V

Match the items in Column A with the items in Column B.

Column A	Column B
1. Explosion	a. The lowest temperature at which a substance catches fire
2. Rapid Combustion	b. A large amount of heat and light energy are released in a short span of time
3. Spontaneous combustion	c. Amount of heat energy produced on the complete combustion of 1 Kg of fuel
4. Calorific value	d. A fuel that fulfils most of the requirements for a particular use
5. Ideal fuel	e. A very fast combustion reaction, producing a large amount of heat, light and sound.
6. Ignition temperature	f. Occurs without any help of external heat