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.

Image result for combustion

Combustion

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:

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

Image result for pollution

Pollution

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

Image result for Liquefied Petroleum Gas

Liquefied Petroleum Gas

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

Result for Ignition temperature

Ignition Temperature

  1. Fire produced by oil cannot be controlled by water.

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