1. Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation? (a) Nuclear energy (b) Thermal energy (c) Solar energy Geothermal energy

Answer is (c) Solar energy

Explanation:

In nuclear energy metals like uranium are used which releases harmful rays than can affect the living organisms. In Thermal energy coal is used which releases Sulphur and Carbon-di-oxide and causes air pollution. In the case of geothermal energy the energy is absorbed by the pressure by the heat from the core which can sometimes be extremely hot and dangerous.