Select the option that is related to the third word in the same way as the second word is related to the first word.

Protractor : Angle :: Scale : ?

Appeared in: MP NHM CHO-2024 (Shift-1)

Explanation

The relationship between the first pair of words (Protractor: Angle) is that of an instrument to the quantity it measures.
A protractor is a tool specifically designed to measure angles.
Applying the same logic, a scale (in the context of a ruler) is an instrument used to measure length.

Option A: An arc is a portion of a circle's circumference. Its defining characteristic in geometry is often its angle, which is measured by a protractor.
Option B: A diameter is a specific geometric term for a line segment within a circle. While a scale can measure its length, 'length' is the more general and fundamental quantity being measured.
Option C: A sector is a two-dimensional area of a circle, similar to a slice of pie. A scale measures linear distance (one dimension), not area.

Visual 1: Diagram - An image showing a protractor measuring the angle between two lines, placed next to an image of a ruler (scale) measuring the length of a line segment. This visually reinforces the instrument-to-measurement relationship.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Analogical Reasoning: Instrument and Measurement as background academic context rather than a clinical decision trigger.
This type of logical reasoning is a foundational skill for problem-solving in any field, including nursing.
Nurses constantly use specific instruments to measure different quantities: a thermometer for temperature, a sphygmomanometer for blood pressure, and a weighing scale for mass/weight. Understanding the precise purpose of each tool is critical for accurate patient assessment and care.
What if? - If the question was 'Sphygmomanometer : Blood Pressure :: Glucometer : ?', the answer would be 'Blood Glucose', following the exact same instrument-to-measurement logic.

How to Approach the Question

First, identify the relationship between the first pair of words: 'Protractor' and 'Angle'.
Recognize that a protractor is an instrument used to measure an angle. The relationship is 'Tool : Measurement'.
Apply this same relationship to the second word, 'Scale'.
Ask yourself: 'What does a scale (like a ruler) measure?' The direct answer is length.
Review the options and select the one that represents the fundamental quantity measured by a scale, which is 'length'.

Concept Tested & Keywords

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Practise the full MP NHM CHO-2024 (Shift-1)

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