NCERT Class VIII Science Solutions: Chapter 6-Combustion and Flame Part 1

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Question 1:

List conditions under which combustion can take place.

Answer:

Conditions under which combustion can take place are as follows:

  • Fuel is required

  • Air (oxygen) is necessary.

  • Ignition temperature is required.

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Combustion

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Question 2:

Fill in the blanks:

  1. Burning of wood and coal causes __________ of air.

  2. A liquid fuel, used in homes is __________.

  3. Fuel must be heated to its __________ __________ before it starts burning.

  4. Fire produced by oil cannot be controlled by __________.

Answer:

Burning of wood and coal causes pollution of air.

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Pollution

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A liquid fuel, used in homes is Liquefied Petroleum Gas (LPG).

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Liquefied Petroleum Gas

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Fuel must be heated to its Ignition temperature before it starts burning.

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Ignition Temperature

Result for Ignition temperature

Fire produced by oil cannot be controlled by water.