AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(D) Tidal energy is correctly classified as a non-conventional source of energy.
Among the given options, Geothermal energy is a non-conventional source of energy.
Source: Energy Resources, Chapter 5
The textbook explicitly lists non-conventional sources as: solar, wind, tidal, geothermal, biogas, and atomic energy. Conventional sources include coal, petroleum, natural gas, and electricity (hydel and thermal). Note: the question stem and options don't match perfectly — the stem lists nuclear/tidal, but the options list natural gas/coal/geothermal. Answer from the given options: (D) Geothermal energy is the correct non-conventional source. Always use the actual options provided, not those in the question stem.