Q.1. Define Combustion and ignition temperature. List conditions under which combustion can take place.
Q.2. (a) What is caused by the burning of wood and coal
Q.2(b) Liquid fuel used in homes is called
Q.2(c) Fuel starts burning when it is heated up to its _____ temperature
Q.2 (d) What type of fire extinguishers should be used to control the fire produced by oil
Q.3. Explain how the use of CNG in automobiles has reduced pollution in our cities.
Q. 4. Compare LPG and wood as fuels