Question

5. 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

Explanation:

(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.

(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.

Answer 2

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.

B - LPG

1 - it is smoke free and does not produce any pollution

2 - it is geauous fuel that's why it is easy to transport

3 - it is easy to stored in cylinder

4 - its California value is more about 55000kj/kg

5 - low ignition temperature

Wood

1 - it give out lots of smoke and unburnt particle carbon particles which cause disease such as asthma

2 - it is solid fuel and it is difficult to transport

3 - it is difficult to store in house because we needs lot of space to store

4 - it's California value is less about 17000 to 22000 kj/kg

5 - high ignition temperature

c - The ignition temperature of paper is lower compared to that of aluminium. When paper is wrapped around an aluminium pipe; the ignition temperature increases. That is why paper itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

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