Q.1: Mark the correct answer in each of the following:
i) Early man was frightened of _____________.
ii) Ans: Fire is the result of a chemical reaction.
Q.2: From the boxes given below choose the one with the correct order of the following sentences:
i) That is fire.
ii) A chemical reaction takes place.
iii) Energy in the form of heat and light is released.
iv) Oxygen combines with carbon and hydrogen.
Ans: vi, ii, iii, i
Working With The Text
Answer the following questions:
Q.1: What do you understand by the ‘flash point’ of a fuel ?
Ans: The ‘Flash point’ of a fuel is the temperature at which it begins to burn.
Q.2: i) What are some common uses of fire ?
Ans: Fire is used to cook food, warm our houses in winter and to generate electricity.
ii) In what sense is it…
View original post 433 more words