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UPSC Prelims Logical Reasoning Questions
Practise logical reasoning (reasoning) for the UPSC Civil Services Preliminary Examination: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Logical Reasoning practice
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Q1.Which number is the odd one out: 31, 37, 53, 55?
Show answer & explanation
Answer: A — 55
53, 37, 31 are prime; 55 is composite (55 = 5 × 11).
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Q2.What is the angle between the hour and minute hands of a clock at 3:25?
Show answer & explanation
Answer: A — 47.5°
Angle = |30H − 5.5M| = |30×3 − 5.5×25| = 47.5°.
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Q3.What day of the week was 23 June 2027?
Show answer & explanation
Answer: D — Wednesday
Using odd days (or Zeller’s rule), 23 June 2027 falls on a Wednesday.
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Q4.If CODE is coded as GSHI, how is TREE coded?
Show answer & explanation
Answer: C — XVII
Each letter moves 4 places forward in the alphabet (CODE → GSHI), so TREE → XVII.
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Q5.Which number is the odd one out: 33, 47, 49, 55?
Show answer & explanation
Answer: C — 47
33, 55, 49 are composite; 47 is prime.
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Q6.Which number is the odd one out: 27, 47, 51, 57?
Show answer & explanation
Answer: B — 47
27, 51, 57 are composite; 47 is prime.
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Q7.What is the angle between the hour and minute hands of a clock at 9:40?
Show answer & explanation
Answer: C — 50°
Angle = |30H − 5.5M| = |30×9 − 5.5×40| = 50°.
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Q8.Find the next letter: I, M, Q, U, ?
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Answer: C — Y
The letters advance by 4 each time (skip 3).
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Q9.Find the next letter: I, L, O, R, ?
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Answer: B — U
The letters advance by 3 each time (skip 2).
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Q10.If MILK is coded as NJML, how is CODE coded?
Show answer & explanation
Answer: B — DPEF
Each letter moves 1 place forward in the alphabet (MILK → NJML), so CODE → DPEF.
How to approach logical reasoning questions
For coding questions write the letter positions (A = 1 … Z = 26). For directions, draw axes and track each turn. Clock angle = |30H − 5.5M|. Calendar: count odd days.
About UPSC Prelims
UPSC Civil Services Preliminary Examination — conducted by Union Public Service Commission (UPSC). The first stage of India’s civil services recruitment, with a General Studies paper and the qualifying CSAT aptitude paper.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
UPSC Prelims practice topics
| Topic | Section | Question source |
|---|---|---|
| Indian Polity, History & Geography | General awareness | Question bank |
| Economy & Banking Awareness | General awareness | Question bank |
| World General Knowledge | General awareness | Question bank |
| Biology | Science | Question bank |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |