Why is the thickness of 100 paper sheets measured together?

If a micrometer's circular-scale zero is below the reference line when closed, its zero error is:

Which balance can measure mass of the order of 0.1 mg?

A micrometer with 1 mm pitch and 100 circular divisions has least count:

In a physical balance, the object is normally placed on the:

The main scale of a typical micrometer is marked in intervals of:

Standard masses should be handled with forceps mainly to:

Which instrument is best for measuring the diameter of a thin wire?

A digital stopwatch that reads hundredths of a second has least count:

A positive zero error in Vernier callipers makes the observed reading:

Which instrument directly measures the duration of a laboratory event?