2019 CSAT, all questions

UPSC Prelims 2019 · CSAT

Question 80: Logical Reasoning and Mental Ability

Directions for the following 2 (two) items : · as printed by UPSC
Passage beginning “S1 : Twice the weight of Sohan is…”

Which one of the following statements is correct ?

aWeight of Mohan is least
bWeight of Sohan is least
cWeight of Rohan is least
d'Whose weight is least' cannot be determined

AnswerUPSC’s answer is (b).

S1 says twice Sohan's weight is below both Mohan's and Rohan's, so Sohan weighs less than half of each of them, and certainly less than each. Mohan and Rohan are both heavier than Sohan, so Sohan is the lightest, whatever the order of the other two. S2 is not needed for this.

Why each option is right or wrong
  • (a) Wrong: Sohan is lighter than Mohan.
  • (b) Right: twice Sohan is below each of the others, so Sohan is lighter than both.
  • (c) Wrong: Sohan is lighter than Rohan.
  • (d) Wrong: S1 fixes the least weight.

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

Source: UPSC, Civil Services (Preliminary) Examination 2019, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.