Question

Give reasons.
(a) Water is not used to control fires involving electrical equipment.
(b) LPG is a better domestic fuel than wood.
(c) Paper by itself catches fire easily whereas a piece of paper wrapped
around an aluminium pipe does not.​

Answer 1

Answer:

A) Water is a good conductor of electricity. If it is used for controlling a fire involving electrical equipments, then the person dousing the fire might get an electric shock. Also, water can damage electrical equipments. ... A piece of paper wrapped around aluminium pipe does not catch fire easily.

B)It conducts electricity and may result electric shock. (B) LPG has more calorific value than wood and LPG produces no pollution. So LPG is a better domestic fuel than wood. (C) The ignition temperature of paper is less, so it catches fire easily.

C)Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not. The ignition temperature of paper is less, so it catches fire easily. It does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat, so paper does not attain its ignition temperature.

Explanation:

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Answer 2

1. Water is a good conductor of electricity.if it is used for controlling a fire involving electrical equipments, then the person dousing the fire might get an electric shock

2.because LPG has more calorific value than wood and LPG produces no pollution. so LPG is a better domestic fuel than wood

3. the ignition temperature of paper is lower compared to that of aluminum. when paper is wrapped around an around an aluminium pipe, the ignition temperature increases

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