Understanding the Analogy: Physical Quantities and SI Units

The question asks us to identify the relationship between the first pair of terms and apply that same relationship to the third term to find the fourth term. The first pair is Electric current and Ampere.

Let's analyze the relationship:

• Electric current is a fundamental physical quantity that measures the flow of electric charge through a circuit.
• Ampere is the standard unit used to measure electric current in the International System of Units (SI).

So, the relationship between the first two terms is: Physical Quantity : Its SI Unit.

Applying the Analogy to Thermodynamic Temperature

The third term given is Thermodynamic Temperature. This is another fundamental physical quantity that measures the degree of hotness or coldness of an object or system relative to a standard reference.

Following the established relationship (Physical Quantity : Its SI Unit), we need to find the SI unit for Thermodynamic Temperature.

Identifying the SI Unit for Thermodynamic Temperature from Options

Let's examine the given options:

• Mole: This is the SI unit for the amount of substance.
• Kelvin: This is the SI unit for Thermodynamic Temperature.
• Pascal: This is the SI unit for pressure.
• Candela: This is the SI unit for luminous intensity.

Based on the analysis, the SI unit for Thermodynamic Temperature is Kelvin.

Therefore, the analogy follows the pattern:

Electric current : Ampere :: Thermodynamic Temperature : Kelvin

The correct answer is Kelvin.

Revision Table: Fundamental SI Units

Additional Information: Understanding SI Units

The International System of Units (SI) is the modern form of the metric system and is the most widely used system of measurement. It is based on seven base units, which are the metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd).

These base units are used to define all other SI units, known as derived units (e.g., Pascal for pressure, which is defined from kilogram, metre, and second). Using a standardized system like SI is crucial for consistency in science, engineering, and international trade.

Understanding the fundamental physical quantities and their corresponding SI units is important for solving problems related to measurement and units in physics and other sciences.