72 Units of Measurement list | Important GK for all exam

Dear Aspirants, in every competitive exam Units of Measurement, are the most important part of General Science.so here we provide detail information about Units of Measurement which helps to Aspirants for SSC, Railway NTPC, Group-D, and State PSU examination.

A unit of measurement is a definite magnitude of a quantity, that is used as a standard for measurement of the same kind of quantity. Many quantities can be expressed as a multiple of the unit of measurement.

To measure any quantity, a definite and a substantial amount of that quantity, is assumed to be standard Which is called a unit of the quantity and when any given quantity is measured in the terms of this unit, the process is called measurement.

There are usually two types of units

(a) Fundamental Units

(b) Derived Units

(a) Fundamental or Base Units:

  • If a physical quantity is expressed in terms of units that are used as standards and these standards are independent of each other, then these units are called Fundamental or Base Units.
  • There are Seven Fundamental Units.

(b) Derived Units:

  • If a physical quantity is expressed in terms of two or more fundamental units these units are called Derived Units.
  • These units have no independent existence like fundamental units.

Example –Force, work, power, etc.

System of Units

Usually, physical quantities are measured in four systems of units

  1. CGS System (Centimeter Gram Second System):

In this system of units Length, Mass and Time are measured in Centimeter, Cram and Second respectively. CGS system is also called Metric or French

System of Units.

 2.MKS System (Meter Kilogram Second System):

In this system of units Length, Mass and Time are measured in Meter, Kilogram and Second.

  1. SI System (International System of Units) :

 The SI System of Units was adopted and accepted on the basis of a comprehensive consensus. In fact, the SI system is an extended and modified

form of the MKS System.

  1. FPS System (Foot Pound Second System):

In this System of units Length, Mass and Time are measured in Foot, Pound and Second. FPS system is also called the British System of Units.

There are Seven Fundamental Units and two Supplementary Units in the SI system.

Fundamental units

SI No.QuantityUnit
1LengthMetre
2Masskilogram
3TimeSecond
4TemperatureKelvin
5Electric CurrentAmpere
6Luminous IntensityCandela
7Amount of SubstanceMole

 

Supplementary Units

  1. Plane Angle- Radian
  2. Solid Angle- Steradian

Important Physical Quantities and Their Units

SI No.QuantityUnit
1LengthMeter
2TimeSecond
3Masskilogram
4AreaSquare meter
5VolumeCubic meter
6SpeedMeter/second
7VelocityMeter/second
8AccelerationMeter/second square
10DensityKilogram/meter cube
11MomentumKilogram x meter/second
12WorkJoule
13EnergyJoule
14ForceNewton
15TorqueNewton x meter
16CoupleNewton x meter
17PressurePascal or Newton/square meter
18FrequencyHertz
19Powerwatt
20WeightNewton or Kilogram
21ImpulseNewton x Second
22Angular VelocityRadian /Second
23ViscosityPoise
24Surface tensionNewton/ Meter
25TemperatureKelvin
26Absolute temperatureKelvin
27Electric currentAmpere
28Electromotive forceVolt
29Electrical conductivityOhm/meter
30Electric energyKilo watt-hour
31Electric powerKilowatt or watt
32Magnetic intensityOrsted
33ChargeCoulomb
34ShipKnot
35AeroplaneMach
36Relative densityNo unit
37Gravity (g)Meter/second square
38Gravitation (G)Newton x Meter2/Kg2
39Magnetic inductionGauss
40Luminous fluxCandela
41Intensity of soundDecibel
42Power of lensDiopter
43Depth of seaFathom
44WavelengthMeter
45Angular accelerationrad/Second square
46Centripetal forceNewton
47Stressnewton /meter square
48StrainNo unit
49Specific gravityNo unit
50Specific Heat capacityJoule/Kg K
51Gold, DiamondCarat
52Astronomical  DistanceLight year
53HeatJoule, Calorie
54Latent heatCaIorie / gm
55Specific heatcal/gm X C0
56ResistanceOhm
57Specific resistanceOhm x cm
58Potential differencevolt
59CapacitanceFarad
60ConductanceMho
61Supersonic motionMach
62InductanceHenry
63Magnetic fluxWeber
64Magnetic flux densityTesla
65Magnetic field Stressampere/meter
66EntropyJoule/ Kelvin
67Thermal conductivitywatt / meter
68Nuclear energyFermi
69Plane AngleRadian
70Solid AngleSteradian
71Luminous IntensityCandela or Lumen
72Amount of SubstanceMole
73Linear MomentumNewton/sec

 

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In this article, cover the important list of  Quantities and their Units of Measurement which are exam-oriented. If you have any doubt please leave a comment in the comment box.

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