5.
Very short answer type questions.
(a) What is the process of burning a substance in presence of oxygen called?
(b) Name a way in which we can control fire.
(c) Which zone of the candle flame is called the dark zone?
le How is the calorific value of a fuel expressed?
ter Write a characteristic of a good fuel.
Answers
Answer:
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Explanation:
Combustion
Combustion is a process of burning a substance in the presence of air or oxygen, as a result of which heat and light are produced.
The air supply to a burning substance can be cut off in a number of ways such as covering the burning substance with carbon dioxide,sand,blanket or a damp cloth. The electrical fires are extinguished by using carbon dioxide gas fire extinguisher
Innermost zone is the zone of no combustion. It is also called as dark zone which is formed around the wick of the candle flame
Calorific value is the amount of energy released or produced when 1 kg of fuel burns or any other substance is burnt in the presence of oxygen and the products of combustion are cooled to STP. Its SI unit is kJ/kg.
It should possess high calorific value.
It should have proper ignition temperature. ...
It should not produce poisonous products during combustion. ...
It should have moderate rate of combustion.
Combustion should be easily controllable i.e., combustion of fuel should be easy to start or stop as and when required.
Answer:
a.combustion
Explanation:
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