Which word is of different class:

Appeared in: BHU NO-2019

Explanation

A circle is the only shape among the options that is formed by a single, continuous curved line.
Unlike the other shapes, a circle has no straight sides or vertices (corners).
Square, Rectangle, and Triangle are all classified as polygons, which are shapes defined by a finite number of straight line segments.

Option B: A square is a polygon, a shape made of four straight lines and four corners. This places it in the same class as a rectangle and a triangle.
Option C: A rectangle is a polygon, a shape made of four straight lines and four corners. This places it in the same class as a square and a triangle.
Option D: A triangle is a polygon, a shape made of three straight lines and three corners. This places it in the same class as a square and a rectangle.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of geometric shapes based on their properties as background academic context rather than a clinical decision trigger.
While not a clinical question, this type of logical reasoning is a foundational skill for nurses. It mirrors the process of differential diagnosis, where a nurse must identify a patient's key symptom (the 'odd one out') that doesn't fit with a suspected condition.
Pattern recognition is crucial in interpreting lab results, ECG strips, and patient charts. A nurse needs to spot the value or waveform that deviates from the expected pattern to identify a problem.
What if the options were 'Heart', 'Lungs', 'Stomach', 'Kidney'? The nurse would need to classify them by system. 'Lungs' might be the odd one out if the others are all part of the digestive or excretory system (depending on context), demonstrating the same classification skill.

How to Approach the Question

First, read the question carefully to understand the task, which is to find the item that is different from the others.
Examine all four options: Circle, Square, Rectangle, and Triangle. Recognize that they are all names of geometric shapes.
Identify a common characteristic shared by most of the options. Observe that Square, Rectangle, and Triangle are all constructed from straight lines.
Determine which option does not share this characteristic. A Circle is formed by a curved line, not straight lines.
Conclude that 'Circle' is in a different class from the others because it is not a polygon.

Concept Tested & Keywords

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Practise the full BHU NO-2019

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