Multiple choice

The standard unit of length used by scientists all over the world is __________.

  1. yard

  2. foot

  3. kilometre

  4. metre

  5. furlong

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Since,  1983 the standard unit of length is metre. It is defined as the distance at 00 C between two lines drawn on a platinum irridium rod kept in international bureau of weights and measures at screws near Paris.