A chips wrapper is 4.5 cm long and 5.9 cm wide. Its area upto significant figures will be
A worldwide system of measurements in which the units of base quantities were introduced is called
All accurately known digits and first doubtful digit in an expression are known as
If zero line of Vernier scale coincides with zero of main scale, then zero error is
Zero error of the instrument is
Length, mass, electric current, time, intensity of light and amount of substance are examples of