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  9. Q84

OPSC OCS 2022 · Question 84 of 98

Gases that trap heat in the atmosphere and cause global warming are called greenhouse bases. Which of the following combinations are not included under the greenhouse gases?

General Studies

  1. ACarbon dioxide, Methane
  2. BNitrous oxide, Hydrofluorocarbons
  3. CCarbon monoxide, Sulphur dioxideCorrect
  4. DCarbon dioxide, water vapour

Answer: C. Carbon monoxide, Sulphur dioxide

Explanation

Carbon Dioxide (CO2): A major greenhouse gas produced through the combustion of fossil fuels and other human activities, contributing to global warming and climate change. Methane (CH4): A potent greenhouse gas released during the production and transport of coal, oil, and natural gas. It has a higher warming potential than carbon dioxide over a short time frame. Nitrous Oxide (N2O): Emitted from agricultural and industrial activities, as well as the burning of fossil fuels and solid waste. It contributes to both climate change and ozone layer depletion. Ozone (O3): While ozone in the stratosphere protects life on Earth by blocking ultraviolet radiation, ground-level ozone is a greenhouse gas and air pollutant formed by chemical reactions between oxides of nitrogen and volatile organic compounds. Water Vapour (H2O): The most abundant greenhouse gas in the Earth's atmosphere. While human activities do not directly control water vapour levels, it is a significant contributor to the natural greenhouse effect."

Source: OPSC OCS (2022) Preliminary GS Paper-I; answers per Apti Plus Academy compilation (to be verified against official OPSC key)

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