Question

Which of the following is not a bio-energy source?

• A. Wood
• B. Gobar gas
• C. Nuclear energy
• D. Coal

Answer 1

The correct option is C

Nuclear energy

Step 1: Explanation of the correct option

In the case of option C,

1. Biomass is a renewable energy source made up of plant and animal waste. Nuclear energy is released during nuclear fission and fusion reactions.
2. As a result, nuclear energy cannot be classified as a bio-mass energy source. Fusion and fission of atoms produce nuclear energy, which releases a vast amount of energy. In the absence of sunlight, both nuclear fusion and fission can take place.
3. Hence, nuclear energy is not a bio-energy source.

Step 2: Explanation for the incorrect options

In the case of option A,

1. The most common use of energy obtained from solid fuel biomass is the combustion of wood.
2. When burning wood, the log's stored potential energy is released as a result of other excited atoms heating it.

In the case of option B,

1. Biogas is classified as a secondary energy source since biomass is utilized to convert biogas into a more efficient and valuable fuel through anaerobic digestion.
2. Gobar gas is another name for biogas, which is created from plant and animal waste.

In the case of option D,

1. Coal is referred to as a fossil fuel because it is made from once-living plants.
2. Because coal comes from plants, and plants get their energy from the sun, coal's energy came from the sun as well.

Hence, the correct option is (C).