SELECT * FROM question_mgmt as q WHERE id=6440 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 fill in the blanks a burning of wood and coal

Question:

Fill in the blanks:
(a) Burning of wood and coal causes                   of air.
(b) A liquid fuel, used in homes is                            .
(c) Fuel must be heated to its                                    before it starts burning.
(d) Fire produced by oil cannot be controlled by                        .

Answer:

(a) Pollution

Burning of wood and coal causes pollution because when they burnt. Carbon dioxide is produced which is a polluted gas.

(b) LPG

We generally used LPG at home. LPG is a clean fuel. When LPG is burnt, no ash is produced behind.

(c) Ignition temperature

Ignition temperature is the minimum temperature at which any substance catches fire easily.

(d) Water  

Fire cannot be controlled by water which is due to oil because water has high density than the oil. So, when water thrown on it, water sinks below the oil.


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