SI Units and Physical Quantities Quiz

6 Questions

A property of an object that can be measured with a measuring instrument

A unit of measure that is internationally accepted

Numbers by themselves don’t make sense, units by themselves don’t make sense

Comparing an unknown quantity with a standard quantity

A quantity obtained from other quantities through multiplication or division

Numerical value

Study Notes

A physical quantity is a quantifiable characteristic of the physical world, such as length, mass, time, and temperature.
A standard unit of measurement is a fixed value of a physical quantity, used as a reference point for measurement, such as meter for length and gram for mass.

All measurements need both a number and a unit to provide a complete description of the physical quantity being measured.
A unit is necessary to specify the scale of measurement, making it possible to compare and communicate measurement results.

Measurement is the process of assigning a numerical value to a physical quantity, using a standard unit of measurement.
It involves comparing the physical quantity being measured with a standard unit, to determine the ratio of the two.

A derived quantity is a physical quantity that is derived from fundamental physical quantities, such as area, volume, and speed.
Derived quantities are often expressed in terms of the fundamental quantities, using mathematical formulas.

In the expression Z = 3x, 'x' represents a physical quantity, and Z is a derived quantity that is three times 'x'.

6 Questions