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Which zone of flame has highest temperature ?


Non-luminous zone.

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What type of fire extinguisher is used to extinguish fire caused by electricity ?


Carbon tetra chloride fire extinguisher.

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Name the type of fire extinguisher used for extinguishing oil fires.


Foam type fire extinguisher.

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Define calorific value of a fuel.


The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg).

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What is global warming ?


Heating up of the earth's atmosphere due to trapping up of the infrared radiation by carbon dioxide in the atmosphere is called global warming. 

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