Bihar Librarian Exam: Comprehensive Reasoning Question Bank
Master the core concepts of logical reasoning for the Bihar School Librarian Eligibility Test with this structured question bank covering coding-decoding, blood relations, direction sense, series completion, and syllogism.
1. Coding-Decoding Fundamentals
Coding-decoding questions test your ability to decipher patterns in letter shifts, reverse ordering, and positional numerical values. Memorize the alphabetical positions (A=1 to Z=26) to solve these problems rapidly during the exam.
Key Point
When letters are shifted forward by a constant value (e.g., +1, +2, or +3), apply the exact numerical offset to each character in the target word. For reverse coding, simply write the letters of the given word backward.
2. Blood Relations Analysis
Blood relation problems require careful parsing of generational hierarchies and familial links. Always break down complex statements phrase by phrase, starting from the speaker or the central subject of the puzzle.
Key Point
Phrases like "my father's son" with no siblings explicitly stated always refer to the speaker themselves. Draw family trees for multi-step relationships to avoid confusion between paternal and maternal relatives.
3. Direction Sense Test
Directional reasoning combines spatial orientation with distance calculation. Questions frequently incorporate cardinal directions, left/right turning rules, shadow positions relative to the sun, and the Pythagorean theorem.
For distance problems involving right-angle turns, use the Pythagorean theorem: $\text{Distance} = \sqrt{(\text{Base})^2 + (\text{Perpendicular})^2}$. Always keep track of sunrise (East) and sunset (West) positions when solving shadow-based orientation questions.
4. Series Completion (Number and Alphabet)
Series completion tests identify underlying arithmetic progressions, geometric progressions, or alternating patterns within numerical and alphabetical sequences.
Common patterns include constant differences (e.g., $+3$), geometric multipliers (e.g., multiplying by $2$), and alternating sequences (e.g., $+3, -2, +3, -2$). For alphabet series, track the skip count between consecutive letters.
5. Syllogism and Logical Deduction
Syllogism questions evaluate whether specific conclusions logically follow from a given set of categorical statements using Venn diagram logic or subset relationships.
Remember that if all elements of Set A are inside Set B, and all elements of Set B are inside Set C, then all elements of Set A are definitively inside Set C. However, subsets that share a common broader category without a direct link do not automatically relate to each other.