Q21 of 87 Page 106

What are fuels? Name any two common fuel.

A fuel is a very good source of heat. The heat energy produced by burning a fuel can be used directly to cook food, for running motor vehicles and factory machines, can be converted into electrical energy at thermal power stations. Wood and Petrol are examples of two common fuels.

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19

Name two substance having low ignition temperature and two having high ignition temperatures.

 20

Fill in the blanks with suitable words:

(a) A fuel must be heated to its……… before it starts burning.


(b)The most common supporter of combustion around us is……………..


(c)Fire produced by burning oil cannot be controlled by…………………….


(d)A liquid fuel used in homes is………


(e)The amount of heat evolved when 1kg of a fuel is burnt completely is called its…………………..


(f)The substance which vaporize during, give…………………..


(g)Burning of wood and coal causes…………….Of air.

 21

State any four characteristic of an ideal fuel(or good fuel).

 22

Define the calorific value of a fuel.