Physics is the branch of science which deals with the study of matter and energy.
Physical quantities are measurable quantities.
System International (SI) is the system of units which consists of seven base units and a number of derived units.
Seven Base SI Units are:
Scientific Notation is an internationally accepted way of writing numbers in which numbers are recorded using the power of ten and there is only one non-zero digit before the decimal.
Vernier Calliper is a device used to measure a fraction of the smallest scale division by sliding another scale over it.
Screw Gauge is a device used to measure a fraction of the smallest scale division by rotatory motion of the circular scale over it.
Stop Watch is an instrument used for the measurement of time interval.
Significant Figures are the accurately known digits and the first doubtful digit in any measurement.