Wired Faculty
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Explain why, fire caused by electricity should not be extinguished by pouring water.
Ordinary water conducts electricity to some extent. So, when water is thrown over the burning electrical appliance or burning electric wires, it can give electric shock to the person involved in fire-fighting. Thus, water should not be used to extinguish fires caused by electricity.
Explain how the use of CNG in automobiles has reduced pollution in our cities.
Compare LPG and wood as fuels.
Give reasons :
Water is not used to control the fire involving electrical equipment.
Give reasons :
LPG is a better domestic fuel than wood.
Give reasons :
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
Make a labelled diagram of candle flame.
Name the unit in which the calorific value of a fuel is expressed.
Explain how CO2 is able to control fires.
It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
Which zone of a flame does a goldsmith use for melting gold and silver and why ?
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