Questions
3 questions per exam
Difficulty
Medium
Importance
Essential for SSC and Banking sectional speed
Overview
Blood Relations and Direction Sense are foundational reasoning topics that test your ability to visualize spatial relationships and kinship hierarchies. Mastering these ensures quick marks in competitive exams like SSC and banking, where time management is critical to clearing the sectional cut-off.
Blood Relation Symbols and Mapping
Aspirants must standardize a notation system to represent familial ties to avoid ambiguity during high-pressure testing. By using consistent symbols for genders and generations, you can draw a structural tree that eliminates mental fatigue and reduces errors.
- Use (+) for Male and (-) for Female.
- Use a horizontal double-headed arrow (<-->) for spouses.
- Use a vertical line for parent-child relationship.
- Use a horizontal dash (-) for siblings.
- Generations should be drawn on distinct horizontal levels.
Direction and Distance Fundamentals
This subtopic involves tracking movement relative to cardinal and inter-cardinal points. Accuracy depends on drawing a precise compass grid at the starting point of every movement sequence.
- Standard orientation: North (Up), South (Down), East (Right), West (Left).
- Total rotation of 360 degrees, with each main cardinal point at 90-degree intervals.
- Always define the starting point as the origin (0,0) on a Cartesian plane.
- Clockwise turns shift direction by 90 degrees in the direction of the clock hands.
Pythagorean Theorem for Displacement
When asked for the 'shortest distance' between the start and end points, simple summation of steps will result in an incorrect answer. You must use the Pythagorean theorem to calculate the resultant vector of your movement.
- Formula: H² = P² + B² (Hypotenuse = Square root of sum of squares of base and perpendicular).
- Identify the right-angled triangle formed by the final position relative to the origin.
- Common triplets: (3,4,5), (5,12,13), (8,15,17) to save calculation time.
- Vertical distance corresponds to North-South movement.
- Horizontal distance corresponds to East-West movement.
Formula Sheet
H = sqrt(P^2 + B^2)
Resultant displacement = sqrt((Net North-South)^2 + (Net East-West)^2)
Exam Tip
Always sketch the family tree or directional path on your rough sheet immediately as you read the problem, rather than attempting to solve via mental visualization.
Common Mistakes
- Assuming the direction of a person 'facing' is the same as the direction of 'movement'.
- Ignoring generation gaps in complex 'pointing' type blood relation questions.
- Forgetting to apply Pythagoras for displacement, instead adding up total distance traveled.
More Revision Notes
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