True or false: standardised units

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   A unit is an arbitrarily chosen reference standard.

2. Statement is true

   Yes

   Statement

   Once chosen, it is properly standardised.

3. Statement is true

   No

   Statement

   Different countries may use different SI base units.

4. Statement is true

   Yes

   Statement

   SI is internationally accepted.

5. Statement is true

   Yes

   Statement

   Measurements need both a number and a unit.

Explanation