UPSC Prelims 2016 · CSAT
Question 19: Logical Reasoning and Mental Ability
There are five persons in a group — P, Q, R, S and T. The group has one doctor, one lawyer and one artist. P and S are unmarried students. T is a man married to one of the group members. Q is the brother of P and is neither doctor nor artist. R is not doctor. Who of the following is definitely a man ?
AnswerUPSC’s answer is (c).
Q is called the brother of P, so Q is definitely a man. P could be Q's brother or sister, and S's gender is not given, so neither is certain. T is also a man, but T is not among the options. So the only sure man among P, S and Q is Q. Remember: a word like brother fixes gender, while a bare letter or a job does not.
Why each option is right or wrong
- (a) P may be Q's brother or Q's sister.
- (b) S's gender is not given.
- (c) Right: Q is called P's brother, so Q is male.
- (d) Q is definitely a man, so this fails.
Answer: UPSC’s key. Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 2016, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.