Identify the figure that is odd in the group

Appeared in: NORCET 3 - 2022 (Shift-1)

Explanation

The circle is the only figure in the group that is a curvilinear figure, meaning it is bounded by a curved line.
Unlike the other shapes, a circle has no straight sides or corners (vertices).
The square, triangle, and rectangle are all classified as polygons, which are figures made exclusively from straight line segments.

Option A: The Square is a polygon with four equal straight sides and four right angles. It shares the property of being a polygon with the Triangle and Rectangle.
Option B: The Triangle is a polygon with three straight sides. It fits the general category of 'polygon' along with the Square and Rectangle.
Option C: The Rectangle is a polygon with four straight sides and four right angles. It belongs to the group of polygons with the Square and Triangle.

Visual 1: Diagram - An image displaying a square, a triangle, a rectangle, and a circle side-by-side. This allows for direct visual comparison, making the difference between the straight-sided polygons and the curved circle immediately apparent.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical Reasoning: Odd One Out (Classification) as background academic context rather than a clinical decision trigger.
While not a clinical question, this type of logical reasoning is crucial for nurses. It mirrors the process of differential diagnosis, where a nurse must identify a patient's unique symptom ('the odd one out') from a cluster of common symptoms to pinpoint a specific condition.
Problem-solving skills are tested daily in nursing. For example, when troubleshooting an IV pump alarm, a nurse must quickly classify potential causes (e.g., occlusion, air in line, empty bag) and identify the one that doesn't fit the current situation.
What if the options were 'Square, Cube, Rectangle, Triangle'? The odd one out would be the Cube, as it is a three-dimensional shape, while the others are two-dimensional.

How to Approach the Question

First, analyze the question type. This is an 'Odd One Out' or 'Classification' question.
Examine all the options provided: Square, Triangle, Rectangle, Circle.
Identify a common property or category that links the majority of the options. In this case, three of the figures (Square, Triangle, Rectangle) are polygons, meaning they are made of straight lines.
Look for the option that does not share this common property. The Circle is made of a curved line, not straight lines.
Confirm that this difference is the most logical and fundamental distinction among the choices.
Select the option that is the exception. The Circle is the only non-polygon, making it the odd one out.

Concept Tested & Keywords

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Practise the full NORCET 3 - 2022 (Shift-1)

Attempt every question from this paper in a timed mock, then review the full solution for each one.