SELECT * FROM question_mgmt as q WHERE id=6443 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=369 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Combustion and Flame give reasons a water is not used to control fi

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. Water is not used to control fires involving electrical equipments because water is the conductor of electricity. It produces ions in the presence of electricity. So, water is not used to control the fire involving electrical equipments.
  2. LPG is a better domestic fuel than wood because LPG is a clean fuel. It does not produce any harmful gas behind burning. It is easy to burn whereas wood produces ash and it does not burns easily.
  3. Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminum pipe does not after the wrapping. Around an aluminum pipe its ignition temperature does not reach as the heat is transferred to the aluminum pipe; and the temperature of the paper lowers down.


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