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UPSC 2019: Why are dewdrops not formed on a cloudy night?
(a)Clouds absorb the radiation released from the Earth's surface.
(b)Clouds reflect back the Earth's radiation.
(c)The Earth's surface would have low temperature on cloudy nights.
(d)Clouds deflect the blowing wind to ground level.
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Not attemptedCorrect Answer: (b) Clouds reflect back the Earth's radiation.
Dew forms when the ground radiatively cools under a clear sky. On cloudy nights, cloud layers act like a blanket, reflecting Earth’s long-wave radiation back to the surface, keeping it too warm for condensation. Thus clouds’ reflection of terrestrial radiation prevents dew formation, making option (b) correct. ([testbook.com](https://testbook.com/question-answer/ques--5f33ca05ac02440d13705b01?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2019 Geography question?▼
The correct answer is option (b): Clouds reflect back the Earth's radiation.. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Atmosphere & Climatology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2019, GS Paper 1, as Question 44. It falls under Geography > Atmosphere & Climatology.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Atmosphere & Climatology?▼
UPSC has asked 70 questions from Atmosphere & Climatology (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.