GA Notes: SI Units of Important Physical Quantities

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Dear Students,

General Science is an equally important section containing weightage of 25 questions in Railway Group-D Exam 2018 and has an even more abundant importance in some other exams conducted by SSC. Most of the questions were asked from the periodic table, si units, numerical on motion velocity acceleration etc, so here we are with notes on Groups in the modern periodic table. So you should know important groups of the modern periodic table so that you can score well in general science section.

SI Units of Important Physical Quantities

The Seven base units In Physics:

length	metre (m)
mass	kilogram (kg)
time	second (s)
electric current	ampere (A)
Thermodynamic temperature	kelvin (K)
luminous intensity	candela (cd)
amount of substance	mole (mol)

The DERIVED Units:

Current	ampere (A)
Potential difference(U)	volt (V = W/A)
Quantity of electricity(Q)	coulomb (C = A.s)
Power(P)	watt (W = J/s)
Energy(W)	joule (J = N.m)
Magnetic induction(B)	tesla (T = Wb/m²)
Electric field(E)	volt per metre (V/m)
Magnetic field strength(H)	ampère per metre (A/m)
Electric conductance(G)	siemens (S = A/V)
Attenuation	decibel (dB)
mass	kilogram (kg)
Volume(V)	m³
Force(F)	newton (N)
Torque(M)	N.m
Pressure(p)	pascal (Pa)
Dynamic viscosity	Pa.s
Kinematic viscosity	m².s-1
Acoustic pressure(p)	pascal (Pa)
Dynamic volume(v)	m³
Length	metre (m)
wavelength	metre (m)
Area (A)	square metre m²
Volume(V)	cubic metre m³
Speed/Velocity(v)	metre per second m/s
acceleration(a)	metre per second squared m/s²
wavenumber(s)	reciprocal metre
density, mass density	kilogram per cubic metre kg/m³
surface density(A)	kilogram per square metre kg/m²
specific volume(v)	cubic metre per kilogram m³/kg
current density(j)	ampere per square metre A/m²
magnetic field strength(H)	ampere per metre A/m
concentration(c)	mole per cubic metre mol/m³
mass concentration	kilogram per cubic metre kg/m³
luminance(Lv)	candela per square metre cd/m²
refractive index(n)	One (1)
relative permeability(µr)	One (1)
frequency	hertz(Hz)
force	newton(N)
pressure/stress	pascal(Pa)
energy/work/amount of heat	joule(J)
power/radiant flux	watt(W)
electric charge/amount of electricity	coulomb(C)
electric potential difference/electromotive force	volt(V)
capacitance	farad(F)
electric resistance	ohm(O)
electric conductance	Siemens (S)
magnetic flux	weber(Wb)
magnetic flux density	tesla(T)
inductance	henry(H = Wb/A)
luminous flux	lumen(lm)
illuminance	lux(lx)
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)
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)
permittivity	farad per metre(F/m)
permeability	henry per metre(H/m)
radiance	watt per square metre steradian W/(m² Sr)