Select the ODD one

Appeared in: RRB Staff Nurse Ahmedabad-2015

Explanation

The correct option is Acre as it is a unit of area, which is a two-dimensional measurement (length × width).
The other three options—Metre, Yard, and Mile—are all units used to measure length or distance, which are one-dimensional measurements.
The fundamental difference is the physical quantity being measured: area versus length.
An acre is defined as an area of 4,840 square yards, explicitly indicating it measures a surface, not a straight line.

Option A: Metre is a unit of length in the metric system. It fits the pattern with Yard and Mile, which are also units of length.
Option B: Yard is a unit of length in the imperial system. It is similar to Metre and Mile in that it measures distance.
Option C: Mile is a unit of length in the imperial system, used for longer distances. It belongs to the same category as Metre and Yard.

Visual 1: Diagram - An infographic visually comparing a one-dimensional line (labeled with Metre, Yard, Mile) next to a two-dimensional square (labeled with Acre) to illustrate the difference between length and area.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Units of Measurement (Length vs. Area) as background academic context rather than a clinical decision trigger.
This is a general aptitude question testing logical reasoning and basic knowledge of measurement units, which is a common component of nursing entrance exams.
While not a direct clinical skill, a nurse's understanding of different units is crucial for accurate calculations, such as converting patient height from feet/inches to centimeters or calculating Body Surface Area (BSA) in square meters (m²).
What if the options were Kilogram, Pound, Gram, and Litre? In that case, Litre would be the odd one out, as it's a unit of volume, while the others are units of mass.

How to Approach the Question

First, analyze the question type. This is an 'Odd One Out' or classification question.
Examine each option to understand what it represents. Here, all options are units of measurement.
Identify the common characteristic or category that links most of the options. In this case, 'Metre', 'Yard', and 'Mile' are all units of length.
Find the option that does not fit into this common category. 'Acre' is a unit of area, not length.
Confirm your reasoning. Length is a one-dimensional measure, while area is a two-dimensional measure. This confirms that 'Acre' is the distinct option.

Concept Tested & Keywords

QIGxsrnLviJEyJRX7QadpN

Practise the full RRB Staff Nurse Ahmedabad-2015

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