Consider the following pairs:1. Solar Eclipse - Occurs at full moon.2....
1. Solar Eclipse - Occurs at full moon.
Incorrect. A solar eclipse occurs when the moon comes exactly between the Earth and the Sun, which happens at new moon, not full moon.
2. Lunar Eclipse - Occurs at new moon.
Incorrect. A lunar eclipse occurs when the Earth comes exactly between the Sun and the Moon, which happens at full moon, not new moon.
3. Dawn - Period between sunset and complete darkness.
Incorrect. Dawn is the period between sunrise and full daylight, not between sunset and complete darkness. The correct term for the period between sunset and complete darkness is twilight.
4. Twilight - Period between sunrise and full daylight.
Correct. Twilight refers to the period between sunset and complete darkness, as well as the period between sunrise and full daylight. In this context, it is correctly matched.
Only the fourth pair is correctly matched, making the answer Option A: Only one pair.
View all questions of this test
Consider the following pairs:1. Solar Eclipse - Occurs at full moon.2....
Understanding the Pairs
To determine which pairs are correctly matched, let's analyze each statement:
1. Solar Eclipse - Occurs at full moon.
- Explanation: A solar eclipse occurs during a new moon when the moon is directly between the Earth and the Sun.
- Status: Incorrect.
2. Lunar Eclipse - Occurs at new moon.
- Explanation: A lunar eclipse occurs during a full moon when the Earth is between the Sun and the moon, causing the Earth's shadow to fall on the moon.
- Status: Incorrect.
3. Dawn - Period between sunset and complete darkness.
- Explanation: Dawn is the time period before sunrise when the sky begins to lighten, not after sunset. The period after sunset is referred to as dusk or twilight.
- Status: Incorrect.
4. Twilight - Period between sunrise and full daylight.
- Explanation: Twilight occurs both before sunrise (morning twilight) and after sunset (evening twilight). It is the time when the sky is partially illuminated but the sun is not yet visible.
- Status: Incorrect as described.
Conclusion
- All four pairs are incorrectly matched. Thus, the correct answer to the question is option 'A': No pair.
This analysis shows that understanding the definitions and timings of celestial events is critical, especially for competitive examinations like UPSC.