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Thursday, July 26, 2012

8th Combustion and Flame CBSE Test Paper

Science CLASS – VIII COMBUSTION AND FLAME
Q.1 Name a few fuels used in our homes.
Q.2 Name a few fuels used in trade and industry.
Q.3 What fuels are used for running automobiles?
Q.4 What is the difference between the burning of a candle and burning of a fuel like coal?
Q.5 What is combustion?
Q.6 Define a fuel?
Q.7 (i) What are the essential conditions required for combustion?
(ii) What is the essential condition required for extinguishing fire?
Q.8 What are inflammable substances?
Q.9 In what form is LPG stored in cylinders?
Q.10 Name the most common fire extinguisher?
Q.11 Water is not suitable for extinguishing fires involving electrical equipment oil and petrol. Why?
Q.12 Explain how CO2 is able to control fires?
Q.13 What are the requisites (qualities) of a good (ideal) fuel?
Q.14 Explain the following terms:-
(i) Global warming
(ii) Acid rain
Q.15 Suppose you are asked to boil a given quantity of water using cow dung  cake, coal and LPG as fuels. Which fuel would you prefer? Give your reason.
Q.16 Define calorific value of a fuel. Though hydrogen has got highest calorific value but it is not used as a domestic fuel. Why?
Q.17 Make a labeled diagram of a candle flame.
Q.18 Name various types of combustion. Give example of each type?
Q.19 Differentiate between.
      (a) Combustible and non combustible substances
      (b) Complete combustion and incomplete combustion.
      (c) Luminous and Non-luminous flames.
Q.20 Define the term ignition temperature. Why substances like alcohol and petrol are called inflammable substances? 

5 comments:

paramjit said...

thanx.......................

paramjit said...

it helps a lot

paramjit said...

it helps a lot

paramjit said...

thanx.......................

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