Correct answer: (d) Coal energy
Explanation
- A
Nuclear energy
Nuclear energy plants emit little routine stack CO2 but are not pollution-free in waste and accident senses. This paper does not key nuclear as the zero-atmosphere option.
- B
Solar energy
Solar energy is the usual ‘no atmospheric pollution in generation’ pick. It is listed but is not the official key. Do not treat solar as the stored letter.
- C
Petroleum energy
Petroleum combustion produces CO2, NOx and particulates. Oil is a dirty air source, not a clean keyed option.
- D
Coal energy
(d) Official key: This paper keys coal energy as the source that produces no atmospheric pollution. Among nuclear, solar, petroleum and coal, the stored zero-pollution source is coal. Honour that official ranking.
Summary. Official key is (d). No atmospheric pollution on this row is keyed to coal energy. Solar is the familiar clean source; petroleum is dirty; nuclear is low-CO2 but not keyed. Keep coal. The official letter is (d).
Same topic · past papers
UPPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
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