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215 simulations

Interactive simulations

Move a slider, drag a point, change a value, and watch the idea respond. Every simulation sits inside an NCERT lesson for NEET and JEE, so you can read the idea and then try it.

Physics

Units and Measurements

Class 11 · 2 simulations

Percentage errors add when you multiplyIn: Uncertainty in calculated results Find the pendulum's formula from dimensions aloneIn: Deducing relations by dimensions

Motion in a Straight Line

Class 11 · 4 simulations

Negative acceleration, faster car?In: Acceleration Position, velocity and the graphs that record themIn: Reading motion graphs Thrown up, coming down: one acceleration all the wayIn: Free fall and vertical motion under gravity Stopping distance: thinking, then brakingIn: Stopping distance and reaction time

Motion in a Plane

Class 11 · 2 simulations

Adding two displacements at an angleIn: Adding vectors analytically Throw the ball: speed and angleIn: Projectile motion

Laws of Motion

Class 11 · 4 simulations

Same change in momentum, different forceIn: Newton's second law, momentum and impulse Static friction adjusts itself, up to a limitIn: Friction What keeps a car on a banked curveIn: Circular motion Friction is not always μNIn: Solving problems in mechanics

Work, Energy and Power

Class 11 · 4 simulations

Work: only the part of the force along the motion countsIn: Work Where does the energy go on a rough patch?In: Conservation of mechanical energy A spring stores ½kx², the area under its F–x lineIn: Potential energy of a spring Collisions: momentum always survives, kinetic energy may notIn: Collisions

System of Particles and Rotational Motion

Class 11 · 2 simulations

See-saw: balance the momentsIn: Principle of moments and centre of gravity Spin chair: pull in, spin upIn: Angular momentum and its conservation

Gravitation

Class 11 · 2 simulations

g inside and outside the earthIn: g above and below the surface Launch speed: fall, orbit or escapeIn: Earth satellites

Mechanical Properties of Solids

Class 11 · 2 simulations

Stress-strain: load a wire until it breaksIn: Hooke's law and the stress-strain curve Beam sag: flat or on edge?In: Applications of elastic behaviour

Mechanical Properties of Fluids

Class 11 · 2 simulations

Hydraulic lift: a small push, a large forceIn: Hydraulic machines Venturi tube: speed up, pressure downIn: Bernoulli's principle

Thermal Properties of Matter

Class 11 · 2 simulations

Heating curve: where the heat goesIn: Latent heat Two rods in series: finding the junction temperatureIn: Conduction

Thermodynamics

Class 11 · 2 simulations

Isothermal or adiabatic: same gas, two pathsIn: Adiabatic process Carnot engine: the ceiling on efficiencyIn: Carnot engine

Kinetic Theory

Class 11 · 3 simulations

Pressure from molecules hitting the wallsIn: Pressure of an ideal gas from molecular impacts rms speed: same energy, different speedsIn: Kinetic interpretation of temperature Degrees of freedom decide a gas's specific heatIn: Specific heats of gases

Oscillations

Class 11 · 2 simulations

Block on a spring: what sets the period?In: Force law for SHM: F = −kx Simple pendulum: length, g and small swingsIn: The simple pendulum

Waves

Class 11 · 2 simulations

A string fixed at both ends: which notes can it play?In: Harmonics of strings and pipes Beats: tuning one string against anotherIn: Beats

Electric Charges and Fields

Class 12 · 2 simulations

Coulomb's law between two charged spheresIn: Coulomb's law Torque on a dipole in a uniform fieldIn: Dipole in a uniform external field

Electrostatic Potential and Capacitance

Class 12 · 2 simulations

A parallel plate capacitor on a 100 V batteryIn: Effect of dielectric on capacitance Capacitors in series and in parallelIn: Combination of capacitors

Current Electricity

Class 12 · 5 simulations

Stretch a wire and watch its resistanceIn: Electric currents in conductors and Ohm's law How fast do electrons really move in a wire?In: Electron drift and where resistivity comes from Why the terminal voltage is less than the emfIn: Cells, emf and internal resistance Two cells: in series, in parallel, and one reversedIn: Cells in series and in parallel Balance a Wheatstone bridgeIn: Wheatstone bridge

Moving Charges and Magnetism

Class 12 · 2 simulations

An electron beam in a magnetic fieldIn: Motion in a magnetic field From galvanometer to ammeter and voltmeterIn: The moving coil galvanometer

Magnetism and Matter

Class 12 · 2 simulations

A bar magnet in a uniform fieldIn: Dipole in a uniform field What a core does to a solenoidIn: Magnetisation and magnetic intensity

Electromagnetic Induction

Class 12 · 2 simulations

A rod sliding on railsIn: Motional emf A coil turning in a fieldIn: AC generator

Alternating Current

Class 12 · 2 simulations

Reactance of a coil and a capacitorIn: AC through a capacitor Tuning a series LCR circuitIn: Resonance

Electromagnetic Waves

Class 12 · 2 simulations

A plane electromagnetic waveIn: Nature of electromagnetic waves Walk the electromagnetic spectrumIn: The electromagnetic spectrum

Ray Optics and Optical Instruments

Class 12 · 4 simulations

Spherical mirror: where the image formsIn: The mirror equation and magnification Snell's law, the critical angle and total internal reflectionIn: Total internal reflection Thin lens: the same drag, a different formulaIn: Thin lenses: lens maker's formula and thin lens formula Prism: the angle of minimum deviationIn: Refraction through a prism

Wave Optics

Class 12 · 2 simulations

Young's double-slit fringesIn: Young's double-slit experiment Polaroids and Malus' lawIn: Malus' law and crossed polaroids

Dual Nature of Radiation and Matter

Class 12 · 2 simulations

Photocurrent and collector potentialIn: Saturation current and stopping potential Einstein's photoelectric equationIn: Einstein's photoelectric equation

Atoms

Class 12 · 2 simulations

Alpha-particle scatteringIn: Alpha-particle trajectory Hydrogen's line spectrumIn: Line spectra of hydrogen

Nuclei

Class 12 · 2 simulations

How big is a nucleus?In: Size of the nucleus Climbing the binding energy curveIn: Binding energy curve

Semiconductor Electronics: Materials, Devices and Simple Circuits

Class 12 · 2 simulations

A one-way valve for currentIn: Diode V-I characteristics From ac to steady dcIn: Half-wave and full-wave rectifiers

Chemistry

Some Basic Concepts of Chemistry

Class 11 · 1 simulation

Which reactant runs out first?In: Stoichiometry and the limiting reagent

Structure of Atom

Class 11 · 2 simulations

Light that knocks out electronsIn: Planck's quantum theory and photoelectric effect Bohr's ladder and hydrogen's linesIn: Bohr's model of the hydrogen atom

Classification of Elements and Periodicity in Properties

Class 11 · 2 simulations

How big is an atom?In: Atomic and ionic radii Pulling an electron offIn: Ionization enthalpy

Chemical Bonding and Molecular Structure

Class 11 · 1 simulation

VSEPR: build a molecule's shapeIn: VSEPR theory and molecular shapes

Thermodynamics

Class 11 · 1 simulation

When does a reaction go on its own?In: Gibbs energy and spontaneity

Equilibrium

Class 11 · 2 simulations

Push an equilibrium and watch it push backIn: Factors affecting equilibria: Le Chatelier's principle pH of a strong acid and a weak acidIn: Ionisation of water, pH, weak acids and weak bases

Redox Reactions

Class 11 · 2 simulations

A metal strip in a salt solutionIn: Competitive electron transfer Oxidation numbers that add upIn: Oxidation number and its rules

Hydrocarbons

Class 11 · 2 simulations

Turning one end of ethaneIn: Conformations of ethane Where does the bromine go?In: Properties and reactions of alkenes

Solutions

Class 12 · 2 simulations

What does the vapour over a mixture contain?In: Vapour pressure and Raoult's law What pressure stops water crossing a membrane?In: Osmosis and osmotic pressure

Electrochemistry

Class 12 · 2 simulations

How does concentration change a cell's voltage?In: The Nernst equation Why does molar conductivity rise on dilution?In: Molar conductivity and dilution

Chemical Kinetics

Class 12 · 2 simulations

How does a reactant run out: steadily or by halves?In: Half-life and pseudo first order Why does a little heat speed a reaction so much?In: Temperature and the Arrhenius equation

The d- and f-Block Elements

Class 12 · 2 simulations

Counting unpaired electrons with a magnetIn: Magnetic properties Where exactly does the pink stay?In: Potassium dichromate and permanganate

Coordination Compounds

Class 12 · 2 simulations

How many chlorides can silver find?In: Werner's theory Pair up or climb the gap?In: Crystal field theory

Haloalkanes and Haloarenes

Class 12 · 2 simulations

Does doubling the nucleophile double the rate?In: SN1 and reactivity order Which way does the product face?In: Stereochemistry of substitution

Alcohols, Phenols and Ethers

Class 12 · 2 simulations

Which phenol gives up its proton most easily?In: Acidity of alcohols and phenols How far can each alcohol be oxidised?In: Oxidation of alcohols

Aldehydes, Ketones and Carboxylic Acids

Class 12 · 2 simulations

Which carbonyl compound passes which test?In: Oxidation and the tests How strong is each acid?In: Physical properties and acidity

Amines

Class 12 · 2 simulations

How basic is each amine?In: Basic character of amines Which amine passes which test?In: Nitrous acid and Hinsberg's reagent

Biomolecules

Class 12 · 3 simulations

Which sugar reduces Tollens' reagent?In: Disaccharides and the glycosidic link What does heat undo in a protein?In: Peptides and the four levels of protein structure Build the partner strandIn: Nucleic acids

Biology

The Living World

Class 11 · 2 simulations

Writing a scientific nameIn: Binomial nomenclature Climbing the taxonomic ladderIn: Taxonomic categories and hierarchy

Biological Classification

Class 11 · 2 simulations

Sorting organisms into five kingdomsIn: The five kingdom classification The sexual cycle of a fungusIn: Kingdom Fungi: body, nutrition and reproduction

Plant Kingdom

Class 11 · 2 simulations

Three ways two gametes meetIn: Algae: body and reproduction Which phase is the plant you see?In: Pteridophytes

Animal Kingdom

Class 11 · 2 simulations

Build a body plan, layer by layerIn: Coelom, segmentation and notochord Heart chambers and body temperatureIn: Amphibians and reptiles

Morphology of Flowering Plants

Class 11 · 2 simulations

Where do the other whorls join?In: Ovary position on the thalamus Where do the ovules sit?In: Gynoecium and placentation

Anatomy of Flowering Plants

Class 11 · 2 simulations

Which bundle is which?In: Vascular bundles Why does a grass leaf roll up?In: Isobilateral leaf

Structural Organisation in Animals

Class 11 · 2 simulations

Where is the frog breathing from?In: Respiration Which duct carries what?In: Reproduction and development

Biomolecules

Class 11 · 2 simulations

What does an enzyme change?In: How enzymes speed up reactions What speeds an enzyme up or slows it down?In: Factors affecting enzyme activity

Cell Cycle and Cell Division

Class 11 · 2 simulations

Crossing over: when does it make something new?In: Prophase I Count the chromosomes and the DNAIn: Meiosis II

Photosynthesis in Higher Plants

Class 11 · 1 simulation

Limiting factors in photosynthesisIn: Factors affecting photosynthesis

Respiration in Plants

Class 11 · 2 simulations

The ATP ledger for one glucoseIn: The respiratory balance sheet The respiratory quotientIn: Respiratory quotient

Plant Growth and Development

Class 11 · 2 simulations

Arithmetic and geometric growthIn: Arithmetic and geometric growth Apical dominanceIn: Auxins

Breathing and Exchange of Gases

Class 11 · 1 simulation

The oxygen dissociation curveIn: Transport of oxygen

Body Fluids and Circulation

Class 11 · 2 simulations

Matching blood for a transfusionIn: Blood groups One turn of the cardiac cycleIn: The cardiac cycle

Excretory Products and their Elimination

Class 11 · 2 simulations

A day of filtrate, balancedIn: Reabsorption and secretion Down, up and down againIn: Counter current mechanism

Locomotion and Movement

Class 11 · 2 simulations

Sliding, not shrinkingIn: Mechanism of muscle contraction Counting to 206In: Appendicular skeleton

Neural Control and Coordination

Class 11 · 3 simulations

Three out, two inIn: Resting potential A wave along the axonIn: Nerve impulse Crossing the gapIn: Transmission of impulses

Chemical Coordination and Integration

Class 11 · 2 simulations

Insulin and glucagon keep blood glucose steadyIn: Pancreas Where does a hormone's receptor sit?In: Mechanism of hormone action

Sexual Reproduction in Flowering Plants

Class 12 · 2 simulations

Building the embryo sacIn: The embryo sac Ploidy map of the fertilised ovuleIn: Double fertilisation

Human Reproduction

Class 12 · 1 simulation

Hormones of the menstrual cycleIn: The menstrual cycle

Reproductive Health

Class 12 · 2 simulations

A 28-day calendar: the pill and the fertile periodIn: Pills, injectables and implants Where does it go? GIFT, ZIFT and IUTIn: Infertility and assisted reproduction

Principles of Inheritance and Variation

Class 12 · 2 simulations

A one-gene cross in pea plantsIn: Inheritance of one gene: dominance and segregation A two-gene cross: seed shape and colourIn: Inheritance of two genes: independent assortment

Molecular Basis of Inheritance

Class 12 · 1 simulation

Reading the genetic codeIn: The genetic code and mutations

Evolution

Class 12 · 2 simulations

Moths on a trunk: natural selection in actionIn: Natural selection seen in action Hardy-Weinberg: from allele frequency to genotypesIn: Mutation and the Hardy-Weinberg principle

Human Health and Disease

Class 12 · 2 simulations

The two-host life cycle of PlasmodiumIn: Malaria and amoebiasis Immune memory: primary and secondary responsesIn: Acquired immunity

Microbes in Human Welfare

Class 12 · 2 simulations

From yeast to drink: ferment, then distil or notIn: Fermented beverages The aeration tank: flocs eat the organic matterIn: Secondary treatment and BOD

Biotechnology: Principles and Processes

Class 12 · 2 simulations

Agarose gel electrophoresis: small fragments run fartherIn: Gel electrophoresis PCR: copies double every cycleIn: PCR

Biotechnology and its Applications

Class 12 · 2 simulations

Bt toxin: inactive in the bacterium, active in the insect gutIn: Bt cotton RNA interference: a double strand silences the nematode's mRNAIn: RNA interference

Organisms and Populations

Class 12 · 2 simulations

Population growth: exponential (J) and logistic (S)In: Logistic growth and life history Population interactions: the sign tableIn: Population interactions

Ecosystem

Class 12 · 2 simulations

Pyramid of energy: the 10 per cent lawIn: Trophic levels and the 10 per cent law Ecological pyramids: upright or inverted?In: Ecological pyramids

Biodiversity and Conservation

Class 12 · 2 simulations

Species-area relationship: what Z meansIn: Species-area relationship The rivet popper hypothesisIn: Diversity and ecosystem stability

Maths

Sets

Class 11 · 2 simulations

Build an intervalIn: Intervals as subsets of R Shade the regions of a Venn diagramIn: Complement and De Morgan's laws

Relations and Functions

Class 11 · 2 simulations

Relation or function?In: Functions Four standard graphsIn: Signum and greatest integer functions

Trigonometric Functions

Class 11 · 2 simulations

What one radian looks likeIn: Radian measure and arc length Sine and cosine on the unit circleIn: Sine and cosine on the unit circle

Complex Numbers and Quadratic Equations

Class 11 · 2 simulations

Points of the Argand planeIn: The Argand plane Where the roots go when D turns negativeIn: Quadratics with a negative discriminant

Linear Inequalities

Class 11 · 2 simulations

Solve and draw a linear inequalityIn: Showing solutions on the number line Where two conditions overlapIn: Systems of inequalities in one variable

Permutations and Combinations

Class 11 · 2 simulations

Fill the places, then countIn: Permutations of distinct objects Patterns in the table of nCrIn: Properties of combinations

Binomial Theorem

Class 11 · 2 simulations

Find any term of (a + b)ⁿIn: The general term Estimate (1 + x)¹⁰ term by termIn: Numbers, estimates and remainders

Sequences and Series

Class 11 · 2 simulations

Steady jar against doubling jarIn: Summing n terms of a GP The A.M. is never below the G.M.In: AM and GM

Straight Lines

Class 11 · 2 simulations

Slope and intercepts of y = mx + cIn: Slope from two points How far is the point from the line?In: Point-to-line distance

Conic Sections

Class 11 · 2 simulations

Focus, directrix and the parabolaIn: Parabola and its standard forms A string, two pins and an ellipseIn: Ellipse: foci and axes

Introduction to Three Dimensional Geometry

Class 11 · 2 simulations

Which octant is P in?In: The eight octants Pythagoras twice: the distance across a boxIn: Distance between two points

Limits and Derivatives

Class 11 · 2 simulations

How fast at exactly 2 s?In: From average speed to instant speed Do both sides agree?In: Left and right hand limits

Statistics

Class 11 · 2 simulations

Where is the total distance least?In: Mean deviation for ungrouped data Shift the scores, stretch the scoresIn: Shifting, scaling and correcting data

Probability

Class 11 · 2 simulations

Load the six and watch every faceIn: Probability of an event Count the overlap onceIn: Probability of A or B

Relations and Functions

Class 12 · 2 simulations

Build a relation on {1, 2, 3}In: Equivalence relations One-one, onto, or both?In: Onto and bijective functions

Inverse Trigonometric Functions

Class 12 · 2 simulations

Pick a branch of sin⁻¹In: sin⁻¹ and its principal branch Does sin⁻¹ undo sin?In: Undoing an inverse

Matrices

Class 12 · 2 simulations

Row by columnIn: Multiplying row by column Two moves, two ordersIn: Order matters in a product

Determinants

Class 12 · 2 simulations

Determinant as an areaIn: Second-order determinants Two lines, one determinantIn: Consistent and inconsistent systems

Continuity and Differentiability

Class 12 · 2 simulations

Left and right limitsIn: Continuity at a point Secant to tangentIn: Differentiability

Application of Derivatives

Class 12 · 2 simulations

How fast a ripple's area growsIn: Rate of change Where f rises, falls and turnsIn: Increasing and decreasing functions

Integrals

Class 12 · 2 simulations

One derivative, a whole familyIn: Antiderivatives and the constant C The area functionIn: The definite integral and the fundamental theorem

Application of Integrals

Class 12 · 2 simulations

Adding up thin stripsIn: Area from thin strips When the integral and the area disagreeIn: Regions below the x-axis

Differential Equations

Class 12 · 2 simulations

A family of solution curvesIn: General and particular solutions How long to double?In: Growth, decay and cooling

Vector Algebra

Class 12 · 2 simulations

Tip to tailIn: Adding vectors Shadow and areaIn: Vector (cross) product

Three Dimensional Geometry

Class 12 · 2 simulations

Walk the lineIn: Equation of a line Skew gapIn: Skew lines and the shortest distance

Linear Programming

Class 12 · 2 simulations

Hunt for the most profitable planIn: The corner point method Slide the profit lineIn: Multiple optimal solutions

Probability

Class 12 · 2 simulations

Shrink the sample spaceIn: Conditional probability Flip the conditionIn: Bayes' theorem