Combustion And Fuels

1. 1. When a substance combines with oxygen giving heat and light, the process is called:

• Respiration

• Combustion

• Fermentation

• Photosynthesis

2. A substance that is burnt to obtain heat and light is called:

• Catalyst

• Fuel

• Supporter of combustion

• Carbon

3. Which of the following is a supporter of combustion?

• Nitrogen

• Hydrogen

• Oxygen

• Carbon Dioxide

4. The minimum temperature at which a substance must be heated before it starts burning is called:

• Calorific value

• Ignition temperature

• Boiling point

• Melting point

5. The amount of heat given out by a unit mass of a fuel on complete combustion in air is called:

• Ignition Temperature

• Heat Capacity

• Calorific value

• Fuel Efficiency

6. Which one of the following is a fossil fuel?

• LPG

• Coal

• Biogas

• Hydrogen

7. Which of these is NOT a good characteristic of a fuel?

• Cheap and easily available

• Cheap and easily available

• Produces harmful gases on burning

• Safe to store and transport

8. Which of the following fuels has the highest calorific value?

• Wood

• Coal

• Hydrogen

• Petrol

9. Which gas is mainly present in biogas?

• Methane

• Hydrogen

• Carbon dioxide

• Oxygen

10. Which of the following fuels produces the least pollution when used in vehicles?

• Petrol

• Diesel

• Coal

• CNG