To change SI units by factors of ten into smaller or bigger units they uses

Substances which larger masses are usually measured in

A. kilograms

B. grams

C. tones

D. metric tones

An instrument which gives a level of high accuracy than mechanical watch is

A. electronic stopwatch

B. stop clock

C. pendulum clock

D. hour glass

In SI system the unit of area is

A. meter

B. square

C. meter square

D. meter cube

The standard unit of time according to SI system is

A. minute

B. second

C. hour

D. day

A single system on which all scientists all over the world agree for units of measurement is called

A. SI units

B. International System of Units

C. both a and b

D. universal system