Consider the following statements:
Statement-I: Giant stars live much longer than dwarf stars.
Statement-II: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions.
Which one of the following is correct in respect of the above statements?
- A.Both Statement-I and Statement-II are correct and Statement II explains Statement-I
- B.Both Statement-I and Statement-II are correct, but Statement II does not explain Statement-I
- C.Statement I is correct but Statement II is incorrect
- D.Statement I is incorrect but Statement II is correct
▶ Answer & Explanation
Correct answer: D. Statement I is incorrect but Statement II is correct
Giant stars, despite their larger size and higher luminosity, burn through their fuel much faster due to their greater mass and core temperature, leading to shorter lifespans compared to dwarf stars. Dwarf stars, particularly red dwarfs, are known for their slow rate of nuclear fusion and exceptionally long lifespans, potentially trillions of years. Therefore, giant stars have a greater rate of nuclear reactions and shorter lifespans.
Source: UPSC gs1 2024