NCERT Class VIII Science Solutions: Chapter 6-Combustion and Flame Part 3

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Question 5:

Give reasons:

  1. Water is not used to control fires involving electrical equipment.

  2. LPG is a better domestic fuel than wood.

  3. Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Answer:

  1. Water is not used to control fires involving electrical equipment because it may conduct electricity and harm those trying to douse the fire.

Image result for Water is not used electrical equipment.

Water is Not Used Electrical Equipment

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  1. LPG is a good fuel as compared to wood as it readily available and it is cheap. It burns easily in air at a moderate rate and it produces a large amount of heat. It does not leave behind any undesirable substances.

Resul for LPG is a compared to wood

LPG is a Compared to Wood

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  1. Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not because the ignition temperature of paper is low as compare to the paper wrapped around an aluminium pipe.

Question 6:

Make a labelled diagram of a candle flame.

Answer:

Result for labelled diagram of a candle flame

Labelled Diagram of a Candle Flame

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