The answer is (d) fossil fuels. Thermal power plants primarily use fossil fuels, such as coal, oil, and natural gas, to generate electricity. These fuels are burned to heat water and create steam, which then drives turbines to produce electricity.
Here’s why the other options are incorrect:
(a) water:
While water is used in thermal power plants as the working fluid (to create steam), it’s not the primary fuel source.
(b) uranium:
Uranium is the fuel used in nuclear power plants, not thermal power plants.
(c) biomass:
Biomass can be used as a fuel in some thermal power plants, but it’s less common than fossil fuels.
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