Which of the following is a unit of the dimension 'length'?

Correct option is B

The correct answer is (b) Metre.

• Metre (m) is the SI unit of length, a fundamental physical quantity that measures distance or displacement.

• It represents the dimension [L], and is used universally for expressing all linear measurements.

Information Booster:

• SI Base Unit of Length: Metre (m)

• Other Derived Units of Length: Kilometer (km), centimeter (cm), millimeter (mm), nanometer (nm)

• 1 metre: Defined as the distance traveled by light in vacuum in 1/299,792,458 seconds.

• Length is a scalar quantity, having magnitude but no direction.

Additional Information (Why Other Options Are Incorrect):

• (A) Joule: Unit of energy or work, dimensionally [ML²T⁻²].

• (C) Ampere: Unit of electric current, dimensionally [I].

• (D) Kilogram: Unit of mass, dimensionally [M].