Statement(A) : Though Fermi is a unit of distance, it is not a fundamental unit

Statement(B) : All practical units need not be fundamental

Both statements A and B are true.

Evaluation of Statements

• Statement A: This statement is true. While the fermi is a unit of distance, it is not a fundamental unit; it is a derived unit based on the meter.
• Statement B: This statement is also true. Practical units, such as the fermi, are often introduced for convenience in specific contexts and are not necessarily fundamental units. They can be derived units tailored for particular applications.

Understanding Units of Measurement

• Fundamental Units: These are the basic units of measurement defined independently and not derived from other units. In the International System of Units (SI), the fundamental units include:
  • Meter (m) for length
  • Kilogram (kg) for mass
  • Second (s) for time
  • Ampere (A) for electric current
  • Kelvin (K) for temperature
  • Mole (mol) for the amount of substance
  • Candela (cd) for luminous intensity
• Derived Units: These units are combinations of fundamental units and are used to express other physical quantities. For example:
  • Velocity: meters per second (m/s)
  • Force: kilogram meter per second squared (kg·m/s²), known as a newton (N)
• Practical Units: These are units introduced for convenience in specific fields of study or applications. They may be either fundamental or derived units, depending on their definition.