Assertion and reason: units

Exercise and reference answers

Questions

1. Reason

   SI is an internationally accepted system of standardised units.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   The same measurement means the same thing worldwide.

2. Reason

   It is built from length and time, which are the base ones.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Speed is not a base quantity.

3. Reason

   SI rests on seven base units.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   The joule is a base unit.

Explanation