Most Important Topics Of Physics For JEE Mains 2021

If You Are Preparing For JEE Mains 2021 Then This Post Will Be A Great Help For All JEE MAINS 2021 Aspirants. In This Post I Have Written About “Most Important Topics Of Physics For JEE Mains 2021”.

All Of You Know That In This I Am Writing About Most Important Topics. So I Have Written Most Important Topics Of Physics From Every Chapter.

So Let's Begin And Read This Complete Article Carefully.

Motion in 1D

● Stopping distance ● Equation of motion ● Free fall-two bodies at the same time ● Graphs

Motion in 2D

● Projectile motion ● vectors

Laws of motion

● String -block and pulley-block. ● Apparent weight inside a lift ● Equilibrium of a body ● Coefficient of friction ● Block on an inclined plane( most repeated) ● Block held stationary against a wall ● Problems are combined with rotational motion

Elasticity

● Change in length of a wire due to stress  ● Work done in stretching  ● Problems from this section are generally combined with thermal expansion, SHM, waves on a string and mechanics  ● Bulk modulus

Thermal expansion

● Thermal stress( two rods fixed between rigid support then heated or cooled)  ● Relation among coefficients of expansion

Calorimetry & Heat transfer

● Calorimetry problems are similar as they all involve just equating heat lost to heat gained  ● Heat loss of bullet embedded in wood  ● Effective thermal resistance of composite slab, concentric cylinders or spheres.  ● Temperature at the interface of two slabs, T shape, Y shape or any other shape.  ● Stefan's law- power radiated by a body- radiant energy received on earth  ● Newton’s cooling

Work, power and energy and collisions

● Vertical circle ● Work calculation when force and displacement are given in vector form ● Work done by spring force ● spring -mass  ● Power  ● Combined with collisons( Energy loss due to collision/ final speed after collision) ● Collision in 2D

COM & Rotational motion

● Body breaks into two parts during motion, velocity of COM ● Finding coordinates of COM( a portion of body is cut out ) ● MOI of rigid body using theorem of perpendicular and parallel axis ● Torque and rotational equilibrium ● Angular velocity and conservation of angular momentum ● Two discs placed on top of each other ● Circular disk or cylinder as pulley, cylinder and rope ● Rod pivoted at one end ● Rolling without slipping

Gravitation

● Gravitational potential energy ● Energy required to launch a satellite into a orbit + energy to move from one orbit to another+ orbital time period ● Escape velocity ● Variation of g with altitude and depth ● Graphs ● Variable mass density problems

Fluid mechanics

● Pressure due to two immiscible liquids  ● Terminal velocity  ● Excess pressure - soap bubble( work done to blow a bubble) and water droplet  ● Work done by surface tension  ● Buoyant force  ● Equation of continuity and bernoulli's theorem  ● Velocity of efflux  ● Capillary rise

Kinetic theory of gases

● Rms speed  ● Molar specific heats   ● Mixture of gases - ratio of Cp and Cv, calculation of thermal energy, internal energy and total energy ● Degrees of freedom ● Mean free path

Thermodynamics

● Calculation of work done or change in internal energy of system using first law of thermodynamics for various processes   ● Adiabatic process  ● Work done and efficiency of cyclic process  ● Carnot engine  ● Indicator diagrams ( representation of same process in different state variables)

SHM	● Equation of SHM  ● Phase difference  ● Spring-block system ( parallel and series combination)  ● Change in time period of pendulum with length and mass  ● Time period when point of suspension accelerates( lift, inclined plane and circular turn)  ● Spring block rotation on a table

String Waves & Sound waves

● General equation of travelling wave  ● Tension in the string  ● Interference of waves  ● Stationary waves  ● Organ pipes and resonance column  ● Intensity of wave  ● Doppler effect+beats  ● Pressure wave

Electrostatic field

● Charge configuration in equilibrium  ● Force between two charged conductors after contact ● Field due to variable charge density ( density as a function of r)  ● Flux involving cube  ● Field due to dipole

Electrostatic potential

● Work done in moving a charge between two points  ● Potential of concentric spherical shells  ● Graph of variation of potential and electric field with distance  ● Potential energy of system of charges  ● Motion of charged particle in an uniform electric field

Current electricity

● Equivalent resistance ● Power and heating effect ● Potentiometer and metre bridge ● Combination of cells

Moving charges and magnetic effects of current

● Lorentz force, circular motion of a charged particle in magnetic field and helical motion  ● Net magnetic field at a point due to current carrying conductors in various shapes  ● Magnetic field of circular loops ( two loops arranged parallel and perpendicular to each other)   ● Solenoid and toroid ● Galvanometer ● Magnetic moment

Electromagnetic induction and Alternating current

● Induced emf ( varying magnetic field, varying area, rotation of loop ) ● Motional emf ● Mutual inductance and self induction ● LCR circuit problems, Power factor  ● Phase difference ● Resonant frequency ● Efficiency of transformer

Ray optics

● Inclined mirrors + number of images formed ● Mirror equation  ● Lateral shift  ● Apparent depth  ● Relation between critical angle and refractive index ( fish looking up through water surface  ● Minimum deviation and prism  ● Lens makers formula +thin lens equation  ● Combination of lenses ( concave and convex lens separated by a distance, plano concave and plano convex lens)  ● Velocity of image  ● Lenses and glass slab ( shift in the position of images)  ● Magnification of compound microscope and telescope

Wave optics

● Interference conditions, maximum and minimum intensity ● Diffraction due to single slit ( angular direction of maxima or minima and central maxima width ● Young's double slit experiment ● Malus law

Dual nature of matter

● De Broglie wavelength( sometimes combined with collision)  ● Photoelectric effect -work function , threshold frequency, maximum velocity ( kinetic energy ) of ejected electrons, stopping potential  ● graphs

atoms

● Energy required for electron excitation  ● Transition of electrons( diagram, frequency and wavelength of emitted radiation)  ● Radii and energy levels of possible orbitals for a given central potential U(r)

Nuclei

● Decay constant, half life  ● Binding energy  ● Energy released due to fission  ● Alpha and beta decay

EMW	● Equation of electromagnetic wave  ● Relation between electric field component and magnetic field component  ● Force on charged particle due to electromagnetic wave  ● Energy density

Semiconductors

● Concentration of electrons and holes  ● Mobility of electrons  ● Diodes circuit  ● Band energy  ● Zener diode as voltage regulator  ● Photo diode  ● Logic gates + boolean expression + input and output signals

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