Questions
5–6 questions per paper
Difficulty
Medium-Hard
Importance
High yield for HPCL/NTPC
Overview
Puzzles and seating arrangements form the backbone of the Logical Reasoning section in PSU recruitment exams. Mastering these requires organizing scattered information into structured formats like tables or diagrams to solve complex constraints efficiently. It is the single most high-yield topic for securing a top rank in exams like HPCL, NTPC, and IOCL.
Linear and Circular Seating
These arrangements test your ability to handle relative positions and directions. For circular arrangements, always mark the center and track left-right orientation based on the person's facing direction, not your own.
- Facing center: Right is anticlockwise, Left is clockwise
- Facing outside: Right is clockwise, Left is anticlockwise
- Linear: North-facing puts Right/Left aligned with yours
- Always start with the most definite piece of information
- Use placeholder slots to represent the total number of seats
Floor-Based Puzzles
Floor puzzles require mapping entities to specific levels in a vertical sequence. The key is to establish a fixed framework (floor numbers 1 to N) and iterate through possibilities using 'either-or' scenarios.
- Assign fixed floor numbering from bottom to top
- Use a tabular grid to map floors against variables
- Identify 'must-be' conditions before 'gap' conditions
- Account for empty floors if specified
Box and Stack Puzzles
Similar to floor puzzles, box stacking involves organizing items based on adjacency and relative height constraints. You must carefully track terms like 'immediately above' versus 'somewhere above'.
- Immediate above means no gap between entities
- Somewhere above implies one or more units in between
- Treat boxes as a vertical stack with definite top/bottom
- Map constraints as logical dependencies
Scheduling Puzzles
These puzzles involve mapping events to specific days, months, or shifts. Success depends on creating a fixed time-axis and filling in the variable attributes assigned to those time slots.
- Establish a permanent time-axis (Days/Months/Years)
- Check for specific day-of-week constraints
- Identify exclusive assignments where one unit occupies one slot
- Use cross-out method for elimination
Exam Tip
Always prioritize puzzles with the most 'definite' clues first and leave complex, multi-variable conditional puzzles for the very end of your attempt.
Common Mistakes
- Misinterpreting 'left' and 'right' when the entity faces away from the center of a circular table.
- Attempting to solve the entire puzzle mentally without drawing the grid or schematic diagram.
- Spending too much time on a single 'stuck' puzzle rather than moving to the next question.
More Revision Notes
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