Question

Measurement means the comparison of a/an ______ quantity with some ______ quantity of the same kind.

• A.
  known, unknown
• B.
  known, known
• C.
  unknown, known
• D.
  unknown, unknown

Answer 1

The correct option is C

unknown, known
Measurement means the comparison of an unknown quantity with some known quantity of the same kind.
For example: In order to measure unknown length of a pencil we need to have some known quantities like metre to compare with these unknown quantities. These known quantities are called units.