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UPSC 1999: The surface area of a spherical dome-shaped roof of a cylindrical water tank shown in the figure is
(a)60 π m²
(b)109 π m²
(c)120 π m²
(d)300 π m²
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Not attemptedCorrect Answer: (b) 109 π m²
From the figure (1999 paper) the dome is not a full hemisphere; solving the geometric relations supplied in the paper yields a curved-surface area of 109 π m², which matches option (b). The official answer key marks option B for Q142. ([scribd.com](https://www.scribd.com/document/932458605/Prelims-1999))
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Frequently Asked Questions
What is the correct answer to this UPSC 1999 Science & Technology question?▼
The correct answer is option (b): 109 π m². Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Quantitative Aptitude question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1999, GS Paper 1, as Question 142. It falls under Science & Technology > Quantitative Aptitude.
What is the difficulty level of this UPSC question?▼
This question is rated "difficult". It is a challenging question that demands deep subject knowledge and analytical thinking.
How many UPSC Prelims questions have been asked from Quantitative Aptitude?▼
UPSC has asked 178 questions from Quantitative Aptitude (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.