Match the following:
| 1. | Commercial source of energy | A | Firewood, agricultural waste, Dried dung |
| 2. | Non-commercial source of energy | B | Commercial + non - commercial |
| 3. | Conventional source of energy | C | Solar energy, wind energy and tidal energy |
| 4. | Non-conventional source of energy | D | Coal, Petroleum, and electricity |
Answer & explanation
Correct answer: option 1
There are commercial and non-commercial sources of energy. Commercial sources are coal, petroleum and electricity as they are bought and sold. Non-commercial sources of energy are fuelwood, agricultural waste and dried dung. These are non- commercial as they are not available in the market on a large scale. Both commercial and non-commercial sources of energy are known as conventional sources of energy. There are three other sources of energy that are commonly termed non-conventional sources — solar energy, wind energy and tidal power.