Ch-14 Sources of Energy (Question) Page243

Question 1:	What is a good source of energy?
Answer :	A good source of energy fulfils the following criteria: (I)It produces a lot of heat per unit mass. (II) It does a huge amount of work per unit mass. (III) It is easily accessible. (IV) It is easy to store and transport. (V)It is economical. (VI)It produces less amount of smoke.
Question 2:	What is a good fuel?
Answer :	A good fuel produces a huge amount of heat on burning, does not produce a lot of smoke, and is easily available.
Question 3:	If you could use any source of energy for heating your food, which one would you use and why?
Answer :	Natural gas can be used for heating and cooking food because it is a clean source of energy. It does not produce huge amount of smoke on burning. Although it is highly inflammable, it is easy to use, transport, and it produces a huge amount of heat on burning.