2012 CSAT, all questions

UPSC Prelims 2012 · CSAT

Question 64: Logical Reasoning and Mental Ability

Examine the following statements :

  1. 1.None but the rich can afford air-travel.
  2. 2.Some of those who travel by air become sick.
  3. 3.Some of those who become sick require treatment.

Which one of the following conclusions can be drawn from the above statements ?

aAll the rich persons travel by air.
bThose who travel by air become sick.
cAll the rich persons become sick.
dAll those who travel by air are rich.

AnswerUPSC’s answer is (d).

Statement 1 says none but the rich can afford air-travel, which means everyone who travels by air is rich. That is conclusion (d). Option (a) reverses it, since being rich does not make someone travel by air. Option (b) turns 'some travellers become sick' into all. Option (c) has no support: the statements say nothing about all rich people being ill. Remember: 'none but A are B' means all B are A.

Why each option is right or wrong
  • (a) Wrong. This reverses statement 1; being rich is necessary for air travel, not a guarantee of it.
  • (b) Wrong. Statement 2 says only some air travellers become sick.
  • (c) Wrong. Nothing links all rich persons to sickness.
  • (d) Right. None but the rich can afford air-travel, so everyone who flies is rich.

Answer: UPSC’s key. Explanation: written by UPSC Grade, not by UPSC.

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Source: UPSC, Civil Services (Preliminary) Examination 2012, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.