# Important SI Units for Competitive Exams 2023: Get to Know Physics SI Units Here

Important SI Units for Competitive Exams 2023: Here we provide you a detailed list of important SI units for competitive exam 2023 and a list of units in physics. Before moving on to the Important SI Units for competitive exams 2023 the candidates must know about units and their systems. They should know about SI units and why SI units are used for a clear understanding of Important SI Units for competitive exams 2023. The candidates appearing for different competitive exams will face a section called general knowledge. In static GK, the exam covers a topic about the important si units and si units in physics. It is a well-known fact that static GK is a difficult section in competitive exams. Even though candidates prepare well, it is tough to score marks in this section. So you have to increase your preparation time and dedication to score well in this section. Devote a lot of time to each static GK topic. We are here to support you with the list of SI units. On continuous preparation, you can easily answer questions regarding the list of important SI units in competitive exams 2023.

## SI Units: Important SI Units for Competitive Exams 2023

Clearing competitive exams is becoming tough nowadays because of the general knowledge section. Static GK is tough to score marks but it is an art. Dedication and concentration can make you score more marks. In static GK, the exam covers a topic about the important si units for competitive exams pdf and si units in physics. Before moving to the topic candidates should know what SI units are and why it is used.

### Units: SI Units for Competitive Exams PDF

It is also called the unit of measurement. A standard amount of physical quantity, such as length, mass, energy, etc specified multiples which are used to express the magnitude of that physical quantity. For instance, the unit of time is second.

#### Fundamental Units: Important SI Units for Competitive Exams 2023

Fundamental units are units adopted for the measurement of a base quantity. The fundamental unit for a particular quantity is chosen for the convention. There are seven fundamental units in the system and they are

• Length - metre

• Time - seconds

• Amount of substance - mole

• Electric current - ampere

• Temperature - kelvin

• Luminous intensity - candela

• Mass - kilogram

#### Derived units: Important SI Units for Competitive Exams 2023

A derived unit is a unit of measurement obtained by the multiplication or division of the base units of a system without the introduction of numerical factors. A unit derived from the fundamental units of length, mass, and time. Examples of derived units are

• Force - newton

• Pressure, stress - pascal

• Energy, work, heat - joule

• Power, radiant flux - watt

• Area - square metre

• Volume - cube metre

and many more.

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### System of Units: Important SI Units for Competitive Exams 2023

A system of units is a set of related units that are used for calculations. Below stated are some of the internationally accepted systems of units

CGS System -centimeter gram second system: Physics SI Units table

A metric system of measurement that uses the centimeter, gram, and second for length, mass, and time accordingly. It is commonly used in theoretical physics

MKS System- Metre-Kilogram-Second System

A metric system that uses meters for length, kilograms for mass, and seconds for time and it is generally used in engineering and beginning physics.

FPS System- Foot-Pound - Second System: Physics SI Units table

A system of units that builds on three fundamental units; the foot for length, the pound for either mass or force, and the second for time. It is used for official and conventional purposes.

#### SI Units: Important SI Units for Competitive Exams 2023

SI Unit is an international system of measurements that are used universally in technical and scientific research to avoid confusion with the units. It is important to have a standard unit system because it helps the entire world to understand the measurements in one set of unit systems. The SI unit was established in 1960. There are two types of SI units and they are base SI units and derived Si units.

#### Why SI units are important?

• SI unit system is based on precise and definite standards.

• The base used in the SI system is 10 which makes the conversion easier.

• Latin and Greek prefixes are used in the SI system and these refer to the numbers.

• Without the use of conversion factors, the SI units can be derived from one another.

Download the SI units list pdf for various competitive exams through the direct link provided here. The SI units physics ssc are available in this si units for competitive exams pdf.

SI Units for Competitive Exams PDF

### Important SI Units for Competitive Exams 2023: Base SI Units

The SI base units are the standard units of measurement defined by the International System of Units(SI) for the base quantities. These are a basic set from which all other SI units can be derived. There are seven base quantities that are mutually independent and the SI units for base quantities are explained with symbols in the table below.

 Important SI Units for Competitive Exams - Base SI Units Base Quantities Physics SI Units Table Symbol Length meter m Mass kilogram kg Time second s Electric current ampere A Thermodynamic temperature kelvin K Amount of substance mole mol Luminous intensity candela cd

### Important SI Units for Competitive Exams 2023: Derived SI Units

SI-derived units are units of measurement derived from the seven base units specified by the International System of Units (SI). They are either dimensionless or can be expressed as a product of one or more base units. It is scaled as an appropriate power of exponentiation. The important derived SI units are given below with their symbol.

 Important SI Units for Competitive Exams - Derived SI Units Derived Quantities Physics SI Units Table Symbol Area Square meter m2 Volume Cubic meter m3 acceleration Meter per second square m/s2 Wave number Meter inverse m_1 Mass density kilogram per cubic metre kg/m3 Specific volume Cubic metre per kilogram m3/kg Current density ampere per square metre A/m2 Magnetic field strength ampere per metre A/m Amount of substance concentration mole per cubic metre mol/m3 luminance candela per square metre cd/m2 Mass fraction kilogram per kilogram which is represented as 1 kg/kg = 1

Derived units with special names and their symbols are listed in a table.

 Important SI Units and Symbols Names of the quantities Units Symbols Plane angle radian rad m - m-1= 1 _ Solid angle steradian sr m2- m-2 _ frequency hertz Hz – s-1 force newton N – m.kg.s-2 Pressure, stress pascal Pa N/m2 m-1kg. s-2 Energy, work, the quantity of heat joule J N.m m2kg. s-2 Power, radiant flux watt W J/s m2kg. s-3 The electric potential difference, electromotive force volt V W/V m2kg. s-3.A-1 capacitance farad F C/V m-2kg. s4.A2 Electric resistance ohm V/A m2kg. s-3.A-2 Electric conductance siemens S A/V m-2kg-1. s3.A2 Magnetic flux weber wb V.s m2kg. s-2.A-1 Magnetic flux density tesla T Wb/m2 kg. s-2.A-1 inductance henry H Wb/A m2kg. s-2.A-2 Celsius temperature Degree celsius °C. – K Activity becquerel bq – s-1

The advancement physics refers to the advanced quantities and they are given below with their symbols.

 Special names of quantities Physics SI Units Table Symbol dynamic viscosity pascal second Pa·s moment of force newton metre N·m surface tension newton per metre N/m angular velocity radian per second rad/s angular acceleration radian per second squared rad/s2 heat flux density, irradiance watt per square metre W/m2 heat capacity, entropy joule per kelvin J/K electric charge density coulomb per cubic metre C/m3 electric flux density coulomb per square metre C/m2 permittivity farad per metre F/m permeability henry per metre H/m specific energy joule per kilogram J/kg thermal conductivity watt per metre kelvin W/(m·K) energy density joule per cubic metre J/m3 electric field strength volt per metre V/m molar energy joule per mole J/mol molar entropy, molar heat capacity joule per mole kelvin J/(mol·K) exposure (x and rays) coulomb per kilogram C/kg absorbed dose rate grey per second Gy/s radiant intensity watt per steradian W/sr

### Physics Important SI Units for Competitive Exams 2023: UPSC, SSC

The candidates appearing for different competitive exams like UPSC and SSC will face a section called general knowledge. In static GK, the exam covers a topic about the important si units and si units in physics. It is a well-known fact that static GK is a difficult section in competitive exams. Even though candidates prepare well, it is tough to score marks in this section. So you have to increase your preparation time and dedication to score well in this section. Devote a lot of time to each static GK topic. We are here to support you with the list of SI units in Physic that is frequently asked for UPSC and SSC.

 Quantity Physics SI Units Table Symbol Length metre m Mass kilogram kg Time second s Work and Energy joule J Electric current ampere A Temperature kelvin K Luminous Intensity candela cd Angle radian rad Solid angle steradian sr Force newton N Area square metre m2 Volume Cubic metre m3 Speed metre per second m s-1 Angle velocity radian per second rad s-1 Frequency Hertz Hz Electric charge coulomb c Potential difference volt v Electric resistance ohm Electrical capacity farad F Magnetic induction henry H Magnetic flux weber Wb Luminous flux lumen lm Intensity of illumination lux lx Wavelength Angstrom A Moment of inertia kilogram square metre kgm2 Momentum Kilogram metre per second kgms-1 Impulse newton second Ns Angular momentum kilogram square metre per second kgm2/s Pressure pascal pa Power watt W Surface tension newton per metre Nm-1 Viscosity newton second per square metre Nsm-2 Thermal conductivity watt per metre degree celsius W/m C Specific heat capacity joule per kilogram per Kelvin Jkg-1K-1

### Use of SI Units In Our Daily Lives: Important SI Units for Competitive Exams 2023

• They are common to the people of the entire world so that people from different countries can communicate with each other conveniently regarding business and science.

• It makes systematic use of prefixes, making it easy to express very large or very small numbers.

• It makes calculations very fast.

• SI units are interrelated in such a way that one unit is derived from other units without conversion factors. SI is used in most places around the world, so our use of it allows scientists from disparate regions to use a single standard in communicating scientific data without vocabulary confusion. SI units are important because these are common to the people of the entire world so that people from different countries can communicate with each other conveniently regarding business and science. It makes systematic use of prefixes, making it easy to express very large or very small numbers.

We hope this article has been useful for the candidates who are appearing for competitive exams. Most of the competitive exams are tough and the competition for passing exams is very high each year. Static GK is tough to score marks but it is an art. Dedication and concentration can make you score more marks. In static GK, the exam covers a topic about the important si units and si units in physics. Make sure before appearing for any competitive exam know all the SI units given in the article and crack the general knowledge section successfully.

## Important SI Units for Competitive Exams 2023: FAQs

Q.What is the importance of SI units in physics?

SI units are important in our daily lives because they are common to the people of the entire world. So that people can communicate conveniently with each other regarding business and science. It is an easy way to express very large numbers and even very small numbers.

Q. What is the unit of speed?

Speed is a derived quantity and the unit of speed is metre per second which is represented as m/s.

Q. Why is the SI unit of time second?

The second was formerly defined as 1/86,400 of the mean solar day, the average period of rotation of the earth. This represents the sole definition of seconds in SI units.

Q. Which unit is the biggest unit of length?

Kilometers are the longest unit of metric measurement. It is abbreviated as km. like miles Kilometre is used to measure length.

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