In the context of climate change which of the following observations are…
2023
In the context of climate change which of the following observations are correct for 20th century with reference to 1750?
A. The global average surface temperature has increased by 0.6°C.
B. Greater increase in daytime temperature than night time has been observed.
C. Global average sea level rose 0.1-0.2 m largely due to thermal expansion.
D. The atmospheric concentration of carbon dioxide (CO2) has increased by 31%.
E. Precipitation in the northern hemisphere has decreased by 1% per decade.
Choose the correct answer from the options given below:
Answer: B. A, C and D only — ConceptClimate observations are evaluated by matching each claim to the measured direction and magnitude of change over the stated period. Temperature, sea…
- A.
A, B, D and E only
- B.
A, C and D only
- C.
B, C and D only
- D.
A, B, C and D only
Attempted by 1 students.
Show answer & explanation
Correct answer: B
Concept
Climate observations are evaluated by matching each claim to the measured direction and magnitude of change over the stated period. Temperature, sea level, greenhouse-gas concentration, and precipitation are separate indicators, so each statement must be checked independently.
Application
Statement A matches the reported twentieth-century global-average surface warming of about 0.6 °C.
Statement B reverses the observed diurnal pattern: night-time minimum temperatures rose faster than daytime maximum temperatures.
Statement C matches the reported global mean sea-level rise of roughly 0.1–0.2 m, with thermal expansion contributing substantially.
Statement D matches the approximately 31% rise in atmospheric carbon-dioxide concentration from the pre-industrial level around 1750.
Statement E reverses the reported trend for most mid- and high-latitude Northern Hemisphere continental areas, where precipitation increased by about 0.5–1% per decade over the assessed period.
Cross-check
A and D supply the cited magnitudes, C supplies the observed sea-level range and mechanism, whereas B and E reverse the measured directions. Therefore the supported set is A, C and D only.