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4. What are the chemicals present in the soda-acid fire extinguisher? 1

Concept –Types of combustion.

1. What is rapid combustion? 1

2. Define spontaneous combustion. 1

3. What is explosive combustion? 1

4. Give two examples of spontaneous combustion. 1

Concept –Fuels.

1. What do you mean by the calorific value of a fuel? 1

2. Write down the unit for the calorific value of a fuel. 1

3. Which has more calorific value? Wood or LPG? 1

4. Write two characteristics of an ideal fuel. 1

Concept –Flame.

1. What do you mean by the flame? 1

2. What is the luminous flame? 1

3. What do you mean by the non-luminous flame? 1

4. In a candle flame which is the least hot zone? 1

5. Which zone is used to melt metals like gold and silver? 1

Concept –Effect of burning of fuel.

1. Why LPG is better fuel than wood? 1

2. What is the full form of CNG? 1

3. What is the full form of LPG? 1

4. Which gases are responsible for global warming? 1

5. Write two advantages of CNG. 2

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