Units and Measurements Introduction

Questions and Answers

Units that are only used in derived quantities.

Units that measure derived physical quantities. (correct)

Units that are specific to historical measurement systems.

Units for fundamental or base quantities that do not depend on other units.

CGS system.

Système Internationale d'Unites (SI). (correct)

MKS system.

FPS system.

Centimetre.

Kilogram. (correct)

Gram.

Second.

<p>A unit that can be expressed as combinations of base units.</p> Signup and view all the answers

<p>Simple and convenient conversions within the system.</p> Signup and view all the answers

Study Notes

Measurement involves comparing a physical quantity with a universally accepted reference standard known as a unit.
Results of measurements consist of a numerical value accompanied by its unit.
A limited number of units can express a vast array of physical quantities due to their interrelated nature.
Fundamental or base quantities have specific units called fundamental units.
Derived quantities are expressed as combinations of base units, resulting in derived units.
The collective system of both base and derived units is referred to as the system of units.

Historically, various countries used different measurement systems, including CGS (centimetre-gram-second), FPS (foot-pound-second), and MKS (metre-kilogram-second).
CGS system: Length - centimetre, Mass - gram, Time - second.
FPS system: Length - foot, Mass - pound, Time - second.
MKS system: Length - metre, Mass - kilogram, Time - second.
The current internationally accepted measurement system is the Système Internationale d’Unités (SI).
Developed by the General Conference on Weights and Measures in 1971 for global technical, industrial, and commercial standardization.
SI units utilize a decimal system, facilitating easy and convenient conversions within the system.