Choose the pair from the given options that shows a similar relation as the pair:-
THERMOMETER : TEMPERATURE
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Cardiograph : Heart rate
Relationship in the given pair:
- A thermometer is an instrument that measures temperature: an instrument and what it measures.
- A cardiograph is an instrument that records the working of the heart, including the heart rate, so the pair has the same relationship in the same order.
Example: The doctor attached the cardiograph to check the patient’s heartbeat.
Why the Other Options are Incorrect?
Option 1: Millimeter : Scale — Incorrect. A scale measures length in millimetres, but the order is reversed: the unit comes first and the instrument second.
Option 2: Length : Breadth — Incorrect. These are two measurements of a shape; neither is an instrument.
Option 3: Solar Energy : Sun — Incorrect. The sun is the source of solar energy; the pair shows a product and its source, not an instrument and what it measures.