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UPSC 1995: A rectangular sump of dimensions 6 m × 5 m × 4 m is to be built by using bricks to make the outer dimension 6.2 m × 5.2 m × 4.2 m. Approximately how many bricks of size 20 cm × 10 cm × 5 cm are required to build the sump for storing water?
(a)1500
(b)3000
(c)15000
(d)30000
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Not attemptedCorrect Answer: (c) 15000
Volume of brickwork = outer volume – inner volume = (6.2 m × 5.2 m × 4.2 m) – (6 m × 5 m × 4 m) ≈ 15.408 m³. Each brick occupies 0.20 m × 0.10 m × 0.05 m = 0.001 m³, so number of bricks ≈ 15.408/0.001 ≈ 15,408 ≈ 15,000; the other three choices differ by an order of magnitude.
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What is the correct answer to this UPSC 1995 Science & Technology question?▼
The correct answer is option (c): 15000. 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 1995, GS Paper 1, as Question 138. It falls under Science & Technology > Quantitative Aptitude.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
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.