Understanding the Analogy: Thermometer and Temperature

The question asks us to identify a word-pair that shares the same relationship as the given pair: Thermometer : Temperature. To solve this, we first need to understand the relationship between a thermometer and temperature.

A Thermometer is a device used to measure Temperature. Therefore, the relationship is: [Device] : [Quantity Measured].

Analyzing the Options for the Analogy

Now let's examine each option provided and see if it fits the [Device] : [Quantity Measured] relationship.

• Taseometer : Acceleration
• Micrometer : Speed
• Voltmeter : Voltage
• Galvanometer : Sound

Detailed Explanation of the Correct Analogy Pair

Let's evaluate each option against the relationship found in Thermometer : Temperature.

Option 1: Taseometer : Acceleration

A Taseometer is indeed a device used to measure acceleration. This pair fits the relationship [Device] : [Quantity Measured].

Option 2: Micrometer : Speed

A Micrometer is a device used to measure very small distances or thicknesses. Speed is a measure of how fast something is moving. This pair does NOT fit the relationship [Device] : [Quantity Measured] in the same way, as a Micrometer measures distance, not speed.

Option 3: Voltmeter : Voltage

A Voltmeter is a device used to measure electric potential difference, which is also known as Voltage. This pair fits the relationship [Device] : [Quantity Measured] perfectly.

Option 4: Galvanometer : Sound

A Galvanometer is a device used to detect or measure small electric currents. Sound is a form of energy that travels in waves. This pair does NOT fit the relationship [Device] : [Quantity Measured], as a Galvanometer measures current, not sound.

Based on the analysis, both Option 1 and Option 3 appear to fit the core relationship. However, the most common and direct example of a device measuring a fundamental physical quantity, similar to how a thermometer measures temperature, is often seen with electrical measurements. Between the provided options, the pairing of a standard electrical measurement device (Voltmeter) with the quantity it measures (Voltage) is a very strong and direct analogy to Thermometer : Temperature. While Taseometer : Acceleration is also valid, Voltmeter : Voltage represents a very standard and well-known device-measurement pair akin to Thermometer : Temperature.

Why Other Options Don't Fit the Analogy

As discussed above:

• Micrometer : Speed is incorrect because a micrometer measures distance/thickness, not speed.
• Galvanometer : Sound is incorrect because a galvanometer measures electric current, not sound.

While Taseometer : Acceleration also fits the basic pattern, Voltmeter : Voltage is a closer parallel in terms of the commonality and directness of the measurement device relative to the quantity, similar to Thermometer : Temperature.

Therefore, the word-pair that best represents a similar relationship to Thermometer : Temperature is Voltmeter : Voltage.

Revision Table: Measurement Devices and Quantities

Additional Information on Measurement Concepts

Measurement is a fundamental concept in physics and engineering. It involves comparing an unknown quantity to a standard quantity using a suitable instrument.

• Instruments: Devices like thermometers, voltmeters, and micrometers are instruments designed specifically for measuring particular physical quantities.
• Quantities: Temperature, voltage, speed, and acceleration are all physical quantities that can be measured.
• Units: Each quantity has standard units for measurement (e.g., Celsius or Kelvin for temperature, Volts for voltage, meters per second for speed, meters per second squared for acceleration). Instruments are calibrated to give readings in these standard units.
• Analogies: Understanding analogies helps in recognizing relationships between different concepts and applying that understanding to new situations, which is a key skill in reasoning and problem-solving.