MOST SCORING CHAPTER FOR JEE MAIN 2020

MOST SCORING CHAPTERS / CONCEPTS THAT ONE SHOULD KNOW BEFORE EXAM ?

Greetings  to Everyone

So folks last month left for preparation,25 days to go for JEE Main 2020 exam. I have gone through the same phase last year that most students are going through Last month left for jee mains and confused what to study in this time. So i am telling you chapters from which you can easily fetch marks and can get a good score .

PHYSICS

Unit 1:  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 Physical quantities, dimensional analysis and its applications

Every year 2-3 question are asked regarding error correction and dimensional analysis.

Unit 2: Kinematics

·        Motion in a straight line: Position-time graph, speed and velocity

·        Uniformly accelerated motion, velocity-time, position-time graphs, 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.

Every year 1-2 question are asked mixing it with other chapters . Projectile motion concepts are very important .

Unit 6: Gravitation

·        The universal law of gravitation.

·        Acceleration due to gravity and its variation with altitude and depth.

·        Gravitational potential energy; gravitational potential.

·        Escape velocity,Orbital velocity of a satellite. Geo-stationary satellites.

Every year 1-2 question are asked mixing it with other chapters . Escape velocity / orbital velocity concepts are very important.

Unit 8: Thermodynamics

·        Thermal equilibrium, zeroth law of thermodynamics, concept of temperature.

·        Heat, work and internal energy.

·        First law of thermodynamics.

·        Second law of thermodynamics: reversible and irreversible processes.

·        Carnot engine and its efficiency.

Every year 2-3  question are asked mixing it with other chapters. Graph based questions and carnot engine questions are asked .

Unit 9: Kinetic Theory Of Gases

·        Equation of state of a perfect gas, work done on compressing a gas.

·        Kinetic theory of gases – assumptions, 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.

Every year 1-2 question are asked mixing it with other chapters. Basic concepts should be clear .

Formula based chapter , easy questions are asked .

Unit 12: Currrent Electricity

·        Electric Cell and its Internal resistance, potential difference and emf of a cell, combination of cells in series and in parallel.

·        Kirchhoff’s laws and their applications.

·        Wheatstone bridge, Metre bridge.

·        Potentiometer – principle and its applications.

Questions are asked majorly on devices and application like potentiomenter, and question are asked to solve circuits by symmetry and other methods to solve circuits .

Unit 14: 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.

All combination of circuits are very important CR,LR,LC . Their voltage and current relationship can be asked . Also rms value of current and transformer formula is very important .

Unit 16: Optics

·        wavefront and Huygens’ principle, Laws of reflection and refraction using Huygen’s principle. Interference, Young’s double slit experiment and expression for fringe width.

·        Diffraction due to a single slit, width of central maximum.

·        Resolving power of microscopes and astronomical telescopes, Polarisation, plane polarized light; Brewster’s law, uses of plane polarized light and Polaroids.

Simple question based on young double slit experiment are asked and lens formula . Must do chapter as weightage is high of this chapter .

Unit 17: 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.

·        Davisson-Germer experiment.

Every year 1-2 question are asked mixing it with other chapters . Photoelectric effects graph concepts are very important.

Unit 18: 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 their properties; radioactive decay law. Mass-energy relation, mass defect; binding energy per nucleon and its variation with mass number, nuclear fission and fusion.

Every year 1-2 question are asked mixing it with other chapters . Energy level in atom , formula , transitions and atomic collisions concepts are very important.

Unit 20: Communication Systems

·        Propagation of electromagnetic waves in the atmosphere; Sky and space wave propagation,

·        Need for modulation,

·        Amplitude and Frequency Modulation,

·        Bandwidth of signals,

·        Bandwidth of Transmission medium,

Every year 1-2 question are asked mixing it with other chapters .Formula of power transmitted , and basic concepts are very important.

MATHEMATICS

Unit 2:Quadratic equations

·        Quadratic equations in real and complex number system and their solutions.

·        Relation between roots and co-efficients, nature of roots, formation of quadratic equations with given roots.

Every year 1-2 questions are asked and it is very easy to solve . Must do chapter .

Unit 3: Matrices and determinants

·        Matrices,

·        algebra of matrices,

·        types of matrices,

·        determinants and

·        matrices of order two and three.

·        Properties of determinants,

·        evaluation of determinants,

·        area of triangles using determinants.

·        Adjoint and evaluation of inverse of a square matrix using determinants and elementary transformations,

·        Test of consistency and solution of simultaneous linear equations in two or three variables using determinants and matrices.

Very easy questions are asked from this chapter , but seems tough because there is hidden trick in every question . Every year question is asked .

Unit 7: Sequences and series

·        Arithmetic and Geometric progressions,

·        insertion of arithmetic,

·        geometric means between two given numbers

·        relation between A.M. and G.M. sum upto n terms of special series: S n, S n2, Sn3

·        Arithmetic – Geometric progression

Formula based chapter , if you have practiced it in past then definitely you will be able to solve this chapter problems in exams.

Unit 6: Binomial theorem and its simple applications

·        Binomial theorem for a positive integral index,

·        general term and middle term,

·        properties of Binomial coefficients

·        simple applications

Formula based chapter very easy to do . These questions will definitely fetch you marks .

UNIT 8: Limit, continuity and differentiability

Formula and practice based chapter , L- hospital rule , and very easy questions on limit is asked , just learn how to solve problems using this .

Unit 10: Differential equations

Just learn how to solve linear DE and homogeneous equation . every year question is asked based on it only .

Unit 14: Statistics and probability

Measures of Dispersion: Calculation of mean, median, mode of grouped and ungrouped data calculation of standard deviation, variance and mean deviation for grouped and ungrouped data.

Probability: Probability of an event, addition and multiplication theorems of probability, Baye’s theorem, probability distribution of a random variate, Bernoulli trials and Binomial distribution.

Every year question are asked of Bayes theorem , learn how to do question on Bayes theorem it is coming in exams.

Unit 15:  Application of Trigonometry

Heights and Distances

Every year question is asked from this concept

Unit 16: Mathematical reasoning

·        Statements, logical operations and, or, implies, implied by, if and only if

·        Understanding of tautology, contradiction, converse and contrapositive

Every year there is fixed one question from this chapter . Must do chapter .

CHEMISTRY

Unit 3: Atomic Structure

·        various quantum numbers (principal, angular momentum and magnetic quantum numbers) and their significance

·        shapes of s, p and d – orbitals, electron spin and spin quantum number

·        Rules for filling electrons in orbitals – aufbau principle, Pauli’s exclusion principle and Hund’s rule, electronic configuration of elements, extra stability of half-filled and completely filled orbitals.

Unit 4: Chemical Bonding And Molecular Structure

·        Covalent Bonding: Concept of electronegativity, Fajan’s rule, dipole moment

·        Valence Shell Electron Pair Repulsion (VSEPR) theory and shapes of simple molecules

·        Quantum mechanical approach to covalent bonding: Valence bond theory – Its important features, concept of hybridization involving s, p and d orbitals

·        Resonance
Molecular Orbital Theory – Its important features, LCAOs, types of molecular orbitals (bonding, antibonding), sigma and pi-bonds, molecular orbital electronic configurations of homonuclear diatomic molecules, concept of bond order, bond length and bond energy.

Unit 6: Solutions

·        Different methods for expressing concentration of solution – molality, molarity, mole fraction, percentage (by volume and mass both), vapour pressure of solutions and Raoult’s Law – Ideal and non-ideal solutions, vapour pressure – composition, plots for ideal and non-ideal solutions

·        Colligative properties of dilute solutions – relative lowering of vapour pressure, depression of freezing point, elevation of boiling point and osmotic pressure

·        Determination of molecular mass using colligative properties; Abnormal value of molar mass, van’t Hoff factor and its significance

Unit 9 : Chemical Kinetics 

·        Rate of a chemical reaction, factors affecting the rate of reactions: concentration, temperature, pressure and catalyst

·        elementary and complex reactions, order and molecularity of reactions, rate law, rate constant and its units, differential and integral forms ofzero and first-order reactions, their characteristics and half-lives, effect of temperature on rate of reactions – Arrhenius theory, activation energy and its calculation, collision theory of bimolecular gaseous reactions (no derivation).

Unit 10: Surface Chemistry

·        Colloidal state- distinction among true solutions, colloids and suspensions, classification of colloids – lyophilic, lyophobic

·        multi molecular, macromolecular and associated colloids (micelles), preparation and properties of colloids – Tyndall effect, Brownian movement, electrophoresis, dialysis, coagulation and flocculation

·        Emulsions and their characteristics

Unit 11: Classificaton Of Elements And Periodicity In Properties

Modem periodic law and present form of the periodic table, s, p, d and f block elements, periodic trends in properties of elements atomic and ionic radii, ionization enthalpy, electron gain enthalpy, valence, oxidation states and chemical reactivity.

Unit 12: General Principles And Processes Of Isolation Of Metals

Modes of occurrence of elements in nature, minerals, ores; Steps involved in the extraction of metals – concentration, reduction (chemical and electrolytic methods) and refining with special reference to the extraction of Al, Cu, Zn and Fe; Thermodynamic and electrochemical principles involved in the extraction of metals.

Unit 17: Co-Ordination Compounds

·        Introduction to co-ordination compounds, Werner’s theory

·        ligands, co-ordination number, denticity, chelation; IUPAC nomenclature of mononuclear co-ordination compounds, isomerism

·        Bonding-Valence bond approach and basic ideas of Crystal field theory, colour and magnetic properties; Importance of co-ordination compounds (in qualitative analysis, extraction of metals and in biological systems).

Unit 20: Some Basic Principles Of Organic Chemistry

Nomenclature (Trivial and IUPAC)
Covalent bond fission – Homolytic and heterolytic: free radicals, carbocations and carbanions; stability of carbocations and free radicals, electrophiles and nucleophiles.
Electronic displacement in a covalent bond – Inductive effect, electromeric effect, resonance and hyper conjugation

Unit 23: Organic Compounds Containing Oxygen

General methods of preparation, properties, reactions and uses.

Every year question is asked on Aldol Condensation and canizaro reaction . especially which involves formation of cyclic ring.

Unit 24: Organic Compounds Containing Nitrogen

General methods of preparation, properties, reactions and uses. Diazotization is the most important topic .

Unit 25: Polymers

·        General introduction and classification of polymers, general methods of polymerization-addition and condensation, co polymerization

·        Natural and synthetic rubber and vulcanization

·        some important polymers with emphasis on their monomers and uses – polythene, nylon, polyester and Bakelite.

UNIT 26: Bio molecules

·        General introduction and importance of biomolecules.

·        Carbohydrates – Classification: aldoses and ketoses; monosaccharides (glucose and fructose) and constituent monosaccharides of oligosacchorides (sucrose, lactose and maltose).

·        Proteins – Elementary Idea of r – amino acids, peptide bond, polypeptides; Proteins: primary, secondary, tertiary and quaternary structure (qualitative idea only), denaturation of proteins, enzymes.

·        Vitamins – Classification and functions.

·        Nucleic Acids – Chemical constitution of DNA and RNA. Biological functions of nucleic acids.

UNIT 27: Chemistry in Everyday Life

Chemicals in medicines – Analgesics, tranquilizers, antiseptics, disinfectants, antimicrobials, antifertility drugs, antibiotics, antacids, antihistamins – their meaning and common examples.

Chemicals in food – Preservatives, artificial sweetening agents – common examples. Cleansing agents – Soaps and detergents, cleansing action.