Paper 1 · People, Development and Environment
UGC NET June 2023 (20.06.2023) Shift-II
In the context of climate change, which of the following observations are correct for the 20th century with reference to 1750?
- The global average surface temperature has increased by 0.6 degrees Celsius
- A greater increase in daytime temperature than night-time has been observed
- The global average sea level rose by 0.1 to 0.2 m, largely due to thermal expansion
- The atmospheric concentration of carbon dioxide has increased by 31 percent
- Precipitation in the northern hemisphere has decreased by 1 percent per decade
A1, 2, 4 & 5 only
B1, 3 & 4 only ✓ Correct
C2, 3 & 4 only
D1, 2, 3 & 4 only
Correct answer: (B) 1, 3 & 4 only — The correct observations are the temperature rise, the sea-level rise and the carbon dioxide rise, so the answer is 1, 3 and 4.
Explanation
★The correct observations are the temperature rise, the sea-level rise and the carbon dioxide rise, so the answer is 1, 3 and 4.
★Over the 20th century the global average surface temperature rose by about 0.6 degrees, matching item 1.
★The global average sea level rose by 0.1 to 0.2 m, largely due to thermal expansion, matching item 3.
★The atmospheric concentration of carbon dioxide rose by about 31 percent since 1750, matching item 4.
★Night-time temperatures actually rose more than daytime ones, so item 2 is wrong.
★Precipitation in the northern hemisphere generally rose rather than fell, so item 5 is wrong.
★So the correct observations are items 1, 3 and 4.
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