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UPSC 2000: A rectangular water tank measures 15 m × 6 m at top and is 10 m deep. It is full of water. If water is drawn out lowering the level by 1 metre, how much of water has been drawn out?
(a)45,000 litres
(b)90,000 litres
(c)4,500 litres
(d)900 litres
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Not attemptedCorrect Answer: (b) 90,000 litres
The volume of water removed equals base-area × fall in level. Base area = 15 m × 6 m = 90 m²; fall = 1 m, so volume = 90 m³. As 1 m³ = 1 000 litres, water drawn out = 90 × 1 000 = 90 000 litres. Options giving 45 000 L use half the base area, while 4 500 L and 900 L come from wrong unit conversions.
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Frequently Asked Questions
What is the correct answer to this UPSC 2000 Science & Technology question?▼
The correct answer is option (b): 90,000 litres. 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 2000, GS Paper 1, as Question 129. It falls under Science & Technology > Quantitative Aptitude.
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 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.