NCERT Class VIII Science Solutions: Chapter 6-Combustion and Flame Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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

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
  1. A liquid fuel, used in homes is Liquefied Petroleum Gas (LPG) .
Image Result for Liquefied Petroleum Gas
  1. Fuel must be heated to its Ignition temperature before it starts burning.
Result for Ignition Temperature
  1. Fire produced by oil cannot be controlled by water.