Read the following passage and answer the question :
Use of Non-conventional sources of Energy : India, as you know, is hugely dependent on thermal & hydro power plants to meet its power needs. Both of these have adverse environmental impacts. Thermal power plants emit large quantities of carbon dioxide which is a green house gas. It also produces fly ash which if not used properly, can cause pollution of water bodies, land & other components of the environment. Wind power & solar rays are good examples of non-conventional cleaner & greener energy sources but they are not yet explored on a large scale due to lack of technological devices.
Why are solar and wind energy not explored on a large scale ?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Due to lack of technological Devices
The passage calls wind power and solar rays good examples of cleaner and greener energy sources. It then says they are not yet explored on a large scale due to lack of technological devices. This means the equipment needed to turn sunlight and wind into power.
Note: The 2018-19 print of the pre-rationalised NCERT gave this reason in the same paragraph. It said that wind power and solar rays were not yet explored on a large scale due to lack of technological devices. The later prints, including the NCERT book (2026-27), drop this reason. They only say that some efforts are being made to tap these sources. The 2018-19 print calls wind power and solar rays ‘conventional’. It should read ‘non-conventional’, as its heading shows.
NCERT (2026-27): “Use of Non-conventional Sources of Energy: India, as you know, is hugely dependent on thermal and hydro power plants to meet its power needs. Both of these have adverse environmental impacts. … In recent years, some efforts are being taken to tap these energy resources.…” NCERT (Pre-rationalised, 2018-19 print):
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