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2023 · Q20Environment & EcologyClimate Change & Greenhouse Gasesmoderate

Consider the following : 1. Aerosols 2. Foam agents 3. Fire retardants 4. Lubricants In the making of how many of the above are hydrofluorocarbons used?

  1. (a)Only one
  2. (b)Only two
  3. (c)Only three
  4. (d)All four
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Official answer(c) Only three

2026 · Q31Environment & EcologyClimate Change & Greenhouse Gasesmoderate

Consider the following statements with reference to India’s response to climate change : I. India’s Long-Term Low Emission Development Strategy (LT-LEDS) is a crucial tool for achieving net-zero emissions by 2070. II. India’s 4th Biennial Update Report (BUR-4) submitted in December, 2024 recorded around 8% decrease in Greenhouse gas emissions in 2020 over 2019. III. Climate-resilient development necessarily depends on quick and short-term achievement of emission reduction targets. Which of the following relationships among the above statements is/are correct ? 1. Statement I is empirically supported by statement II. 2. Statement III contradicts the approach implicit in statement I. 3. Statement I and statement III together establish the premise of long-term sustainability. Select the answer using the code given below :

  1. (a)1 only
  2. (b)1 and 2
  3. (c)2 and 3
  4. (d)3 only
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Official answer(b) 1 and 2

2025 · Q29Environment & EcologyClimate Change & Greenhouse Gaseseasy

Consider the following statements : I. Without the atmosphere, temperature would be well below freezing point everywhere on the Earth’s surface. II. Heat absorbed and trapped by the atmosphere maintains our planet’s average temperature. III. Atmosphere’s gases, like carbon dioxide, are particularly good at absorbing and trapping radiation. Which of the statements given above are correct?

  1. (a)I and III only
  2. (b)I and II only
  3. (c)I, II and III
  4. (d)II and III only
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Official answer(c) I, II and III

2025 · Q31Environment & EcologyClimate Change & Greenhouse Gasesmoderate

Consider the following statements : Statement I : Studies indicate that carbon dioxide emissions from cement industry account for more than 5% of global carbon emissions. Statement II : Silica-bearing clay is mixed with limestone while manufacturing cement. Statement III : Limestone is converted into lime during clinker production for cement manufacturing. Which one of the following is correct in respect of the above statements?

  1. (a)Both Statement II and Statement III are correct and both of them explain Statement I
  2. (b)Both Statement II and Statement III are correct but only one of them explains Statement I
  3. (c)Only one of the Statements II and III is correct and that explains Statement I
  4. (d)Neither Statement II nor Statement III is correct
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Official answer(b) Both Statement II and Statement III are correct but only one of them explains Statement I

2025 · Q38Environment & EcologyClimate Change & Greenhouse Gasesmoderate

Consider the following statements : I. Carbon dioxide (CO2) emissions in India are less than 0·5 t CO2/capita. II. In terms of CO2 emissions from fuel combustion, India ranks second in Asia-Pacific region. III. Electricity and heat producers are the largest sources of CO2 emissions in India. Which of the statements given above is/are correct?

  1. (a)I and III only
  2. (b)II only
  3. (c)II and III only
  4. (d)I, II and III
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Official answer(c) II and III only

2023 · Q18Environment & EcologyClimate Change & Greenhouse Gasesmoderate

Consider the following statements : 1. Some microorganisms can grow in environments with temperature above the boiling point of water. 2. Some microorganisms can grow in environments with temperature below the freezing point of water. 3. Some microorganisms can grow in highly acidic environment with a pH below 3. How many of the above statements are correct?

  1. (a)Only one
  2. (b)Only two
  3. (c)All three
  4. (d)None
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Official answer(c) All three