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UPSC 1997: Seven persons P, Q, R, S, T, U and V participate in and finish all the events of a series of swimming races. There are no ties at the finish of any of the events. V always finishes somewhere ahead of P. P always finishes somewhere ahead of Q. Either R finishes first and T finishes last or S finishes first and U or Q finishes last. If in a particular race V finished fifth, then which one of the following would be true?
(a)S finishes first
(b)R finishes second
(c)T finishes third
(d)R finishes fourth
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Not attemptedCorrect Answer: (a) S finishes first
If V is 5th, the only way to keep V ahead of P and P ahead of Q with the alternate ‘R-first/T-last OR S-first/(U or Q)-last’ condition is to adopt the second alternative: S must be 1st while either U or Q is 7th. With S fixed at 1st and V occupying 5th place, the remaining positions can be filled so that all other constraints are met; none of the other options can be made consistent with the rules. Hence S finishes first. ([scribd.com](https://www.scribd.com/document/731910044/1997))
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Frequently Asked Questions
What is the correct answer to this UPSC 1997 Science & Technology question?▼
The correct answer is option (a): S finishes first. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Logical Reasoning & Puzzles question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1997, GS Paper 1, as Question 142. It falls under Science & Technology > Logical Reasoning & Puzzles.
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 Logical Reasoning & Puzzles?▼
UPSC has asked 71 questions from Logical Reasoning & Puzzles (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.