UPSC Prelims 2017 · CSAT
Question 69: Logical Reasoning and Mental Ability
A, B, C, D, E, F and G are Lecturers from different cities—Hyderabad, Delhi, Shillong, Kanpur, Chennai, Mumbai and Srinagar (not necessarily in the same order) who participated in a conference. Each one of them is specialized in a different subject, viz., Economics, Commerce, History, Sociology, Geography, Mathematics and Statistics (not necessarily in the same order). Further
- 1.Lecturer from Kanpur is specialized in Geography
- 2.Lecturer D is from Shillong
- 3.Lecturer C from Delhi is specialized in Sociology
- 4.Lecturer B is specialized in neither History nor Mathematics
- 5.Lecturer A who is specialized in Economics does not belong to Hyderabad
- 6.Lecturer F who is specialized in Commerce belongs to Srinagar
- 7.Lecturer G who is specialized in Statistics belongs to Chennai
Who is specialized in Geography?
AnswerUPSC’s answer is (a).
Fix the cities and subjects: D is Shillong, C is Delhi (Sociology), F is Srinagar (Commerce), G is Chennai (Statistics). A, B and E hold Hyderabad, Kanpur and Mumbai. A is Economics, and Kanpur's lecturer is Geography, so A is not Kanpur; A is not Hyderabad, so A is Mumbai. B, D and E hold History, Geography and Mathematics, and B is neither History nor Mathematics, so B has Geography and is the Kanpur lecturer. So Geography is B's.
Why each option is right or wrong
- (a) Correct: B is left with Geography and is from Kanpur.
- (b) D takes History or Mathematics, with E taking the other.
- (c) E is from Hyderabad and takes History or Mathematics.
- (d) The clues fix everyone except the History and Mathematics split between D and E, which does not affect Geography.
Answer: UPSC’s key. Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 2017, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.