Question

Which one is not a commercial energy?
A. Coal
B. Animal power
C. Petroleum and natural gas
D. Electricity

Answer 1

Hint: Commercial energy is the form of energy that is used to generate electricity and that is available in the market with a specific price.

Complete Answer:
1. Coal: Coal is a naturally occurring hard rock which can be burned as a solid fossil fuel in order to obtain energy.
- Coal mostly contains carbon but along with carbon it also contains hydrogen, sulphur, oxygen and nitrogen.
- It is black or brownish-black in colour.
- The most significant use of coal is the generation of electricity, steel production, cement manufacturing, etc. and all the forms of energy we get from coal energy are commercially available.

2. Animal power: Animal power is an energy by which animals perform certain tasks like walking.
- This energy can not be used by any other person.
- It can only be used by a person who owns it.
- So this energy is non commercial energy.

3. Petroleum and natural gas: Petroleum is a liquid fossil fuel while natural gas is a gaseous fossil fuel.
- These are the non renewable sources of energy.
- We get petroleum and natural gas from the ground surface below the oceans.
- We use petroleum and the constituents derived from petroleum in several ways like petrol, diesel we use to run our vehicles.
- Also we use natural gas in many ways like LPG (liquefied petroleum gas) for cooking.
- So these are commercially available.

4. Electricity: Electricity is a form of energy that we get from the running turbines of water , coal, etc.
- This form of energy is also available commercially.

Hence, option B is the right answer for this question.

Note: We shouldn't waste these energies because the resources are in limited amounts and also they can not be renewed. Once they get over we can’t do anything because we can’t make them in laboratories.