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Home Articles

Important SI Units for Competitive Exams Physics PDF

by Sreevidya M
January 28, 2022
in Articles, General Knowledge, JEE, KEAM, Static GK
Important SI Units for Competitive Exams Physics PDF
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Table of Contents

  • System of units
  • SI Units
  • Study Notes PDF for Physical Quantities and their SI Units
  • Dimensions of a physical quantity

The selected standard used for measuring a physical quantity is named a unit. It should be well defined, easy to reproduce, easy to compare, internationally accepted and independent of changes in physical conditions. There are two types of units.

  1. Fundamental units- independent of any other units

The seven fundamental units are the units used to measure the physical quantities length, mass, time, electric current, temperature, luminous intensity and amount of substance. Besides these seven, two supplementary units are given to measure the physical quantities angle and solid angle

  1. Derived units – obtained by mathematical operations between two fundamental units.These units are used to measure physical quantities like speed, velocity, density, force, pressure, work, energy etc.

Click here to learn more about SSC General Science

System of units

Below stated are some of the internationally accepted systems of units

  1. CGS System -centimetre gram second system
  2. MKS Sysytem- Meter-Kilogram-Second System
  3. FPS System- Foot-Pound System
  4. SI Units

SI Units

The term SI unit is the condensation of the French term Système International. The Systeme International d’Unites (SI) was implemented in 1960 after an international convention of 50 member states which consisted of all the main industrialized nations. SI is the International System of Units and have existed since 1960. Founded and sustained by the General Conference on Weights and Measures (CGPM). This has substituted the variety of measurement units across the world. Unifying the unit system has made it easier to express the units universally. They are the standard units used in science, technology, industry, and everyday commerce all over the world. The SI is envisioned to be an evolving structure; units and prefixes are formed and unit definitions are altered through the international agreement as to the technology of measurement advances and the accuracy of measurements improves. SI unit is also called the metric system.

SI Units of seven fundamental quantities

physical quantity unit abbreviation
mass kilogram kg
length meter m
time second s
temperature Kelvin K
amount of substance mole mol
electric current ampere A
luminous intensity candela cd

Click here to read the latest notes for competitive exams

SI Units of two supplementary units

Physical quantity SI Unit Symbol
Angle Radian rad
Solid angle Steradian sr

Table of important physical quantities and their SI Units

Quantity Units (S.I.)
Radioactivity Becquerel
Luminous flux Lumen
Magnetic flux density Tesla
Magnetic flux Weber
Length Metre
Time Second
Mass Kilogram
Area Square metre
Volume Cubic metre
Velocity Metre/second
Acceleration Metre/second square
Density Kilogram/metre Cube
Work Joule
Energy Joule
Force Newton
Pressure Pascal or Newton/sq. metre Charge
Frequency Hertz
Power Watt
Weight Newton or Kilogram
Impulse Newton-second
Angular velocity Radian /second
Viscosity Pascal
Surface tension Newton/square metre
Heat Joule
Temperature Kelvin
Absolute temperature Kelvin
Resistance Ohm
Electric current Ampere
Electromotive force Volt
Electrical conductivity Ohm/metre
Electric energy Kilo watt-hour
Electric power Kilowatt or watt
Magnetic intensity Oersted
Charge Coulomb
Magnetic induction Gauss
Luminous flux Candela
Intensity of sound Decibel
Power of lens Dioptre
Depth of sea Fathom
Inductance Henry
Electrical conductance Siemens

Study Notes PDF for Physical Quantities and their SI Units

Given below is in the table is a PDF of the notes for the topic

Topic PDF
Physical quantities and their SI Units physical quantities and their SI units

click here to attempt a science mock test

Important quantities and their CGS units

Quantity CGS unit name Unit symbol
length, position centimetre cm
mass gram g
time second s
velocity centimetre per second cm/s
acceleration galileo Gal
force dyne dyne
energy erg erg
power erg per second erg/s
pressure barye Ba
dynamic viscosity poise P
electric charge franklin Fr
kinematic viscosity stokes St
electric current biot Bi
wavenumber kayser (K) cm−1

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Dimensions of a physical quantity

Dimension of a physical quantity is the powers to which the fundamental qualities have to be raised to define that quantity. Some examples are given in the following table.

 No Physical Quantity Dimensional Formula
1 Area (A) [M0L2T0]
2 Volume (V) [M0L3T0]
3 Density (d) [M1L-3T0]
4 Speed (s) [M0L1T-1]

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Sreevidya M

Post-Graduate in English Language and Literature, freelance writer and an SSC aspirant. Provides updates on notifications, syllabuses and dates for government exams.

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