## JEE Main 2021 Syllabus

NTA has released the syllabus for JEE main which is divided into 3 sections i.e. Maths, Chemistry, Physics. JEE main syllabus is composed of the Class 11th and 12th syllabus. The JEE main syllabus remains the same this year also. Candidates are advised to study each and every topic given in the JEE main syllabus

## JEE Main Syllabus: Physics

JEE Main(B.tech/B.Arch) syllabus for physics is divided into two sections-

• Section A- Theory Part- This section has 80% weightage.
• Section B- Experimental Part- This section has 20% weightage.

Section A Syllabus.

 Unit Topic Number of questions asked PHYSICS AND MEASUREMENT Physics,  technology  and  society,  S I  Units, fundamental  and  derived  units,  least  count, accuracy  and  precision  of  measuring instruments,  Errors  in  measurement, Dimensions of Physics quantities, dimensional  analysis and  its applications. 1-2 KINEMATICS The  frame  of  reference,  motion  in  a straight  line,  Position-  time  graph,  speed and  velocity;  Uniform  and  non-uniform motion,  average  speed  and  instantaneous velocity,    uniformly  accelerated  motion, velocity-time, position-time graph, relations  for  uniformly  accelerated  motion, Scalars  and  Vectors,  Vector.  Addition  and subtraction,  zero  vector,  scalar  and  vector products,  Unit  Vector,  Resolution  of  a Vector.  Relative  Velocity,  Motion  in  a plane,  Projectile  Motion,  Uniform  Circular Motion. 1-2 LAWS  OF  MOTION Force  and  inertia,  Newton’s  First  law  of motion;  Momentum,  Newton’s  Second Law  of  motion,  Impulses;  Newton’s  Third Law  of  motion.  Law  of  conservation  of linear  momentum  and  its  applications. Equilibrium  of  concurrent  forces. Static  and  Kinetic  friction,  laws  of  friction, rolling  friction. Dynamics  of  uniform  circular  motion: centripetal  force  and its  applications. 1-2 WORK, ENERGY  AND POWER Work  done  by  a  content  force  and  a variable  force;  kinetic  and  potential energies, work-energy  theorem, power. The  potential  energy  of  spring conservation of  mechanical  energy, conservative  and  neoconservative  forces; Elastic  and  inelastic  collisions  in  one  and two dimensions. 1-2 ROTATIONAL MOTION Centre  of  the  mass  of  a  two-particle system,  Centre  of  the  mass  of  a  rigid  body; Basic  concepts  of  rotational  motion;  a moment  of  a  force;  torque,  angular momentum,  conservation  of  angular momentum  and  its  applications;  the moment  of  inertia,  the  radius  of  gyration. Values  of  moments of  inertia for   simple  geometrical  objects,  parallel  and perpendicular  axes  theorems  and  their applications.  Rigid  body  rotation  equations of  rotational  motion. 2-3 GRAVITATION The universal law of  gravitation. Acceleration  due  to  gravity  and  its variation  with  altitude  and  depth.  Kepler’s law  of  planetary  motion.  Gravitational potential  energy;  gravitational  potential. Escape  velocity,  Orbital  velocity  of  a satellite. Geo  stationary  satellites. 1-2 PROPERTIES  OF  SOLIDS  AND LIQUIDS Elastic relationship, behaviour, Hooke's Stress-strain Law. Young's modulus,  bulk  modulus,  modulus  of rigidity.  Pressure  due  to  a  fluid  column; Pascal's  law  and  its  applications.  Viscosity. Stokes'  law.  terminal  velocity,  streamline and  turbulent  flow.  Reynolds  number. Bernoulli's  principle  and  its  applications. Surface  energy  and  surface  tension,  angle of  contact,  application  of  surface  tension  - drops,  bubbles  and  capillary  rise.  Heat, temperature,  thermal  expansion;  specific heat  capacity,  calorimetry;  change  of  state, latent  heat.  Heat  transfer-conduction, convection  and  radiation.  Newton's  law  of cooling. 1-2 THERMODYNAMICS Thermal  equilibrium,  zeroth  law  of thermodynamics, the concept of temperature.  Heat,  work  and  internal energy.  The  first  law  of  thermodynamics. The  second  law  of  thermodynamics: reversible  and  irreversible  processes. Carnot  engine  and  its  efficiency. 2-3 KINETIC THEORY OF GASES Equation  of  state  of  a  perfect  gas,  work done  on  compressing  a  gas,  Kinetic  theory of  gases  -  assumptions,  the  concept  of pressure.  Kinetic  energy  and  temperature: RMS  speed  of  gas  molecules:  Degrees  of freedom.  Law  of  equipartition  of  energy, applications  to  specific  heat  capacities  of gases;  Mean  free  path.  Avogadro's  number. 1-2 OSCILLATIONS AND  WAVES Periodic  motion  -  period,  frequency, displacement  as  a  function  of  time.  Periodic functions. Simple harmonic  motion (S.H.M.)  and  its  equation;  phase: oscillations  of  a  spring  -restoring  force  and force  constant:  energy  in  S.H.M.  -  Kinetic and  potential  energies;  Simple  pendulum  - derivation  of  expression  for  its  time  period: Free,  forced  and  damped  oscillations, resonance. Wave  motion.  Longitudinal  and  transverse waves,  speed  of  a  wave.  Displacement relation  for  a  progressive  wave.  Principle  of superposition  of  waves,  a  reflection  of waves.  Standing  waves  in  strings  and  organ pipes,  fundamental  mode  and  harmonics. Beats. Doppler  Effect  in sound. 1-2 ELECTROSTATICS Electric  charges:  Conservation  of  charge. Coulomb's  law-forces  between  two  point charges,  forces  between  multiple  charges: superposition  principle  and  continuous charge distribution. Electric  field:  Electric  field  due  to  a  point charge,  Electric  field  lines.  Electric  dipole, Electric  field  due  to  a  dipole.  Torque  on  a dipole in a uniform  electric  field. Electric flux. Gauss's  law  and  its applications  to  find  field  due  to  infinitely long  uniformly  charged  straight  wire, uniformly  charged  infinite  plane  sheet  and uniformly  charged  thin  spherical  shell. Electric  potential  and  its  calculation  for  a point  charge,  electric  dipole  and  system  of charges;  Equipotential  surfaces,  Electrical potential  energy  of  a  system  of  two  point charges  in an  electrostatic field. Conductors  and  insulators.  Dielectrics  and electric polarization, capacitor, the combination  of  capacitors  in  series  and parallel,  capacitance  of  a  parallel  plate capacitor  with  and  without  dielectric medium  between  the  plates.  Energy  stored in a capacitor. 2-3 CURRENT  ELECTRICITY Electric  current.  Drift  velocity.  Ohm's  law. Electrical resistance. Resistances  of different  materials.  V-l  characteristics  of Ohmic  and  non-ohmic  conductors. Electrical  energy  and  power.  Electrical resistivity.  Colour  code  for  resistors;  Series and  parallel  combinations  of  resistors; Temperature dependence  of  resistance. Electric  Cell  and  its  Internal  resistance, potential  difference  and  emf  of  a  cell,  a combination  of  cells  in  series  and  parallel. Kirchhoff’s  laws  and  their  applications. Wheatstone bridge. Potentiometer - Metre principle applications. 3-4 MAGNETIC  EFFECTS  OF CURRENT AND MAGNETISM Biot  -  Savart  law  and  its  application  to current  carrying  circular  loop.  Ampere's law  and  its  applications  to  infinitely  long current  carrying  straight  wire  and  solenoid. Force  on  a  moving  charge  in  uniform magnetic and electric  fields. Cyclotron. Force  on  a  current-carrying  conductor  in  a uniform  magnetic field.  The  force  between two  parallel  current  carrying  conductorsdefinition  of  ampere.  Torque  experienced by  a  current  loop  in  a  uniform  magnetic field:  Moving  coil  galvanometer,  its  current sensitivity  and  conversion  to  ammeter  and voltmeter. Current  loop  as  a  magnetic  dipole  and  its magnetic  dipole  moment.  Bar  magnet  as  an equivalent  solenoid,  magnetic  field  lines; Earth's  magnetic  field  and  magnetic elements.  Para-,  dia-  and  ferromagnetic substances.  Magnetic  susceptibility  and permeability.  Hysteresis.  Electromagnets and permanent  magnets. 2-3 ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS Electromagnetic  induction:  Faraday's  law. Induced  emf  and  current:  Lenz’s  Law, Eddy  currents.  Self  and  mutual  inductance. Alternating  currents,  peak  and  RMS  value of  alternating  current/  voltage:  reactance and  impedance:  LCR  series  circuit, resonance:  Quality  factor,  power  in  AC circuits,  wattless  current.  AC  generator  and transformer. 1-2 ELECTROMAGNETIC WAVES Electromagnetic characteristics, waves and their Transverse  nature  of electromagnetic  waves,  Electromagnetic spectrum  (radio  waves,  microwaves, infrared, visible, ultraviolet. X-rays. Gamma rays),  Applications  of  e.m. waves. 1-2 OPTICS Reflection  and  refraction  of  light  at  plane and  spherical  surfaces,  mirror  formula. applications.  Deviation  and  Dispersion  of light  by  a;  prism;   Lens  Formula. Magnification. Power  of  a  Lens. Combination  of  thin  lenses  in  contact. Microscope  and  Astronomical  Telescope (reflecting  and  refracting  )  and  their magnifying  powers.  Wave  optics:  wavefront  and  Huygens' principle.  Laws of  reflection and  refraction using  Huygens  principle.  Interference, Young's double-slit experiment  and expression  for  fringe  width,  coherent sources  and  sustained  interference  of  light. Diffraction  due  to  a  single  slit,  width  of central  maximum.  Resolving  power  of microscopes  and  astronomical  telescopes. Polarization, plane-polarized light: Brewster's  law,  uses  of  plane-polarized light  and  Polaroid. 2-3 DUAL NATURE OF MATTER AND RADIATION Dual  nature  of  radiation.  Photoelectric effect.  Hertz  and  Lenard's  observations; Einstein's  photoelectric  equation:  particle nature  of  light.  Matter  waves-wave  nature of  particle,  de  Broglie  relation.  DavissonGermer  experiment. 1-2 ATOMS AND  NUCLEI Alpha-particle scattering experiment; Rutherford's  model  of  atom;  Bohr  model, energy levels, hydrogen spectrum. Composition  and  size  of  nucleus,  atomic masses, isotopes, isobars: isotones. Radioactivity-  alpha.  beta  and  gamma particles/rays and radioactive properties; decay  law.  Mass-energy relation,  mass  defect;  binding  energy  per nucleon  and  its  variation  with  mass number, nuclear  fission and  fusion. 1-2 ELECTRONIC DEVICES Semiconductors;  semiconductor  diode:  1V  characteristics  in  forward  and  reverse bias;  diode  as  a  rectifier;  I-V  characteristics of  LED.  the  photodiode,  solar  cell  and Zener  diode;  Zener  diode  as  a  voltage 1-2 COMMUNICATION SYSTEMS Propagation  of  electromagnetic  waves  in the  atmosphere;  Sky  and  space  wave propagation. Need for modulation. Amplitude  and  Frequency  Modulation, Bandwidth  of  signals.  the  bandwidth  of Transmission  medium,  Basic  Elements  of  a Communication  System  (Block  Diagram only). 1-2

Section B

 Experimental Skills Familiarity  with  the  basic  approach  and observations  of  the  experiments  and activities:  1.  Vernier  callipers- its  uses  to  measure  the internal  and  external  diameter  and depth  of  a  vessel.  2.  Screw  gauge- its  uses  to  determine thickness/  diameter  of  thin  sheet/wire.  3.  Simple  Pendulum-dissipation  of  energy by  plotting  a  graph  between  the  square of  amplitude  and time.  4.  Metre  Scale  -  the  mass  of  a  given  object by  principle of  moments.  5.  Young's  modulus  of  elasticity  of  the material  of  a metallic wire.  6.  Surface  tension  of  water  by  capillary rise and  effect  of  detergents,  7.  Coefficient  of  Viscosity  of  a  given viscous  liquid  by  measuring  terminal velocity  of  a given spherical  body,  8.  Plotting  a  cooling  curve  for  the relationship  between  the  temperature  of a hot  body  and time.  9.  Speed  of  sound  in  air  at  room temperature  using  a resonance  tube,  10.  Specific  heat  capacity  of  a  given  (i) solid  and  (ii)  liquid  by  method  of mixtures.  11.  The resistivity  of  the  material  of  a  given wire using a metre bridge.  12.  The  resistance  of  a  given  wire  using Ohm's law. 13.  Potentiometer- i. Comparison  of  emf  of two  primary cells. ii. Determination resistance of  a cell. of internal  14.  Resistance  and  figure  of  merit  of  a galvanometer  by  half  deflection method. (ii)  15.  The  focal  length  of; (i)  Convex mirror (ii)  Concave mirror,  and Convex lens, using  the parallax  method.  16.  The  plot  of  the  angle  of  deviation  vs angle  of  incidence  for  a  triangular prism.  17.  Refractive  index  of  a  glass  slab  using  a travelling  microscope.  18.  Characteristic  curves  of  a  p-n  junction diode  in  forward and reverse bias.  19.  Characteristic  curves  of  a  Zener  diode and  finding  reverse  breakdown voltage.  20.  Characteristic  curves  of  a  transistor  and finding  current  gain and voltage gain.  21.  Identification of Diode. LED, Transistor.  IC.  Resistor.  A  capacitor from  a  mixed collection of  such  items.  22.  Using  a  multimeter  to: (i)  Identify  the  base  of  a  transistor (ii)  Distinguish  between  NPN  and  PNP type transistor (iii)  See  the  unidirectional current  in case  of  a  diode and  an LED. (iv)  Check  the  correctness  or  otherwise of  a  given  electronic  component (diode, transistor  or  IC).