For Class 8, 9 & 10
Master the basics - and everything after gets easier
Concept-first questions with clear model answers in Physics, Chemistry, Maths and Biology, all NCERT-aligned. Start early, build the habit, and walk into your boards, NEET and JEE already ahead.
Interactive lessons
learn by playingDrag, slide and build - watch each concept come alive, then reveal the answer.
200 interactive lessons
Ohm's law
Class 10 Physics
Slide V & R, watch the bulb glow
Open →pH scale
Class 10 Chemistry
Slide across acids and bases
Open →Atomic number and mass number
Class 9 Chemistry
Add protons & neutrons, build shells
Open →Laws of reflection
Class 8 Physics
Change the angle, watch it bounce
Open →Volume of a sphere
Class 9 Maths
Grow the radius, see the volume
Open →Area of a trapezium
Class 8 Maths
Drag the sides, read the area
Open →Power of a lens
Class 10 Physics
Move the object, trace the rays
Open →Food chain and energy flow
Class 10 Biology
Follow the energy as it flows
Open →Speed
Class 8 Physics
Slide distance & time, watch the speed
Open →Density
Class 9 Physics
Pack mass into volume, float or sink
Open →Work done
Class 9 Physics
Push harder or farther, watch work grow
Open →Kinetic energy
Class 9 Physics
Speed it up - energy grows with the square
Open →Power of a lens
Class 10 Physics
Shorten the focal length, boost the power
Open →Mole concept
Class 9 Chemistry
Weigh out grams, count the moles
Open →Avogadro's number
Class 9 Chemistry
Add moles, count the particles
Open →Microscope magnification
Class 8 Biology
Grow the image, read the magnification
Open →Population density
Class 10 Biology
Add individuals, shrink the land, see crowding
Open →Simple interest
Class 8 Maths
Slide money, rate & time, watch interest
Open →Pythagoras theorem
Class 9 Maths
Stretch the two sides, get the hypotenuse
Open →Probability of an event
Class 10 Maths
Change the outcomes, watch the odds
Open →Newton's second law
Class 9 Physics
Push a mass, pick an acceleration
Open →Momentum
Class 9 Physics
Slide mass & velocity, build momentum
Open →Pressure
Class 8 Physics
Shrink the area, feel the pressure rise
Open →Weight
Class 9 Physics
Change the planet's gravity, watch your weight
Open →Refractive index
Class 10 Physics
Slow light in the medium, raise the index
Open →Resistors in series
Class 10 Physics
Add two resistors in a line
Open →Mass percentage of a solution
Class 9 Chemistry
Dissolve solute, read the strength
Open →Concentration of a solution
Class 9 Chemistry
Pack solute into less liquid
Open →Population change
Class 10 Biology
Balance births against deaths
Open →Compound microscope
Class 8 Biology
Combine eyepiece & objective lenses
Open →Area of a circle
Class 8 Maths
Grow the radius, watch the area square
Open →Volume of a cuboid
Class 8 Maths
Stretch length, breadth & height
Open →Electronic configuration and valency
Class 9 Chemistry
Slide the atomic number, build the atom
Open →Homologous series (alkanes)
Class 10 Chemistry
Add carbons, name the compound
Open →Mass number
Class 9 Chemistry
Add protons & neutrons, get the mass number
Open →Power
Class 9 Physics
More work in less time = more power
Open →Potential energy
Class 9 Physics
Lift a mass higher, store energy
Open →Wave speed
Class 9 Physics
Tune frequency & wavelength, set the speed
Open →Electric current
Class 10 Physics
Push charge per second, get the current
Open →Percentage
Class 8 Maths
Compare part to whole as a %
Open →Electron dot structure
Class 9 Chemistry
Draw valence electrons as dots
Open →Acceleration
Class 9 Physics
Speed up over time, find acceleration
Open →Distance, speed and time
Class 8 Physics
Set speed & time, cover the distance
Open →Frequency and time period
Class 9 Physics
Shorten the period, raise the frequency
Open →Heating effect of current
Class 10 Physics
Raise the current, watch heating soar
Open →Area of a triangle
Class 8 Maths
Set base & height, halve the rectangle
Open →Area of a rectangle
Class 8 Maths
Set length & breadth, fill the area
Open →Mean (average)
Class 9 Maths
Share the total equally across items
Open →Discount
Class 8 Maths
Slide price & % off, see the saving
Open →Heart rate
Class 10 Biology
Set heart rate & time, count the beats
Open →Resistors in parallel
Class 10 Physics
Wire two resistors side by side
Open →Electric charge
Class 10 Physics
Flow current over time, collect charge
Open →Electrical energy and units
Class 10 Physics
Run appliances, add up the units
Open →Kelvin temperature scale
Class 9 Chemistry
Slide Celsius, read the Kelvin
Open →Moles from number of particles
Class 9 Chemistry
Divide particles by Avogadro's number
Open →Ten percent law
Class 10 Biology
See 10% of energy reach the next level
Open →Area of a square
Class 8 Maths
Grow the side, square the area
Open →Volume of a cube
Class 8 Maths
Grow the edge, cube the volume
Open →Circumference of a circle
Class 8 Maths
Grow the radius, roll out the rim
Open →Surface area of a cube
Class 9 Maths
Grow the edge, cover six faces
Open →Potential difference
Class 10 Physics
Share work across charge, get volts
Open →Resistance from Ohm's law
Class 10 Physics
Divide voltage by current, get resistance
Open →Echo and SONAR
Class 9 Physics
Time the echo, find the distance
Open →Mass from moles
Class 9 Chemistry
Multiply moles by molar mass
Open →Breathing rate
Class 10 Biology
Set breathing rate & time
Open →Volume of a cylinder
Class 10 Maths
Set radius & height, fill the can
Open →Compound interest
Class 8 Maths
Compound money over years
Open →Profit and loss percentage
Class 8 Maths
Set cost & selling price, see profit %
Open →Perimeter of a rectangle
Class 8 Maths
Set length & breadth, walk the border
Open →Surface area of a sphere
Class 10 Maths
Grow the radius, wrap the ball
Open →Time period
Class 9 Physics
Raise the frequency, shrink the period
Open →Relative velocity
Class 9 Physics
Two objects approach - add their speeds
Open →Average velocity
Class 9 Physics
Average the start and end speeds
Open →Equations of motion (v = u + at)
Class 9 Physics
Accelerate from u for a time t
Open →Kelvin to Celsius
Class 9 Chemistry
Slide Kelvin, read the Celsius
Open →Population growth rate
Class 10 Biology
Balance births vs deaths per population
Open →Perimeter of a square
Class 8 Maths
Grow the side, walk four edges
Open →Perimeter of a triangle
Class 8 Maths
Add the three sides
Open →Area of a parallelogram
Class 8 Maths
Set base & height, slide the shape
Open →Area of a rhombus
Class 8 Maths
Set the two diagonals
Open →Equations of motion (distance)
Class 9 Physics
Start, accelerate, cover ground
Open →Joule's law of heating
Class 10 Physics
Raise current, resistance or time
Open →Electric power (P = VI)
Class 10 Physics
Multiply voltage by current
Open →Average atomic mass of isotopes
Class 9 Chemistry
Mix two isotopes by abundance
Open →Seed germination percentage
Class 9 Biology
Count sprouted seeds out of the total
Open →Volume of a cone
Class 9 Maths
Set radius & height, fill the cone
Open →Surface area of a cylinder
Class 9 Maths
Wrap the side and both ends
Open →Surface area of a cuboid
Class 9 Maths
Cover all six rectangular faces
Open →nth term of an AP
Class 10 Maths
Step from the first term by d
Open →Sum of an AP
Class 10 Maths
Add up the first n terms
Open →Focal length of a mirror
Class 10 Physics
Halve the radius to find the focus
Open →Speed of light in a medium
Class 10 Physics
Raise the index, slow the light
Open →Percentage purity
Class 9 Chemistry
Weigh the pure part of a sample
Open →Slope of a line
Class 10 Maths
Rise over run gives the steepness
Open →Percentage change
Class 8 Maths
Compare a new value to the old
Open →Volume of a hemisphere
Class 9 Maths
Grow the radius of half a ball
Open →Area of a sector
Class 10 Maths
Cut a slice of angle from a circle
Open →Length of an arc
Class 10 Maths
Measure the curved edge of a slice
Open →Slant height of a cone
Class 9 Maths
Combine radius & height for the slant
Open →Unit conversion (km/h to m/s)
Class 9 Physics
Convert km/h into m/s
Open →Equations of motion (v^2 = u^2 + 2as)
Class 9 Physics
Accelerate over a distance, find v
Open →Impulse
Class 9 Physics
Hit harder or longer, change momentum
Open →Wavelength
Class 9 Physics
Speed over frequency gives wavelength
Open →Oscillations
Class 9 Physics
Vibrate at a frequency for a time
Open →Cost of electricity
Class 10 Physics
Units times rate gives the bill
Open →Number of neutrons
Class 9 Chemistry
Take protons away from the mass number
Open →Curved surface area of a cone
Class 9 Maths
Wrap the slanted side of a cone
Open →Total surface area of a cone
Class 9 Maths
Add the base circle to the cone's side
Open →Curved surface area of a hemisphere
Class 9 Maths
Cover the dome of a hemisphere
Open →Diagonal of a square
Class 9 Maths
Cross a square corner to corner
Open →Unit conversion (m/s to km/h)
Class 9 Physics
Convert m/s into km/h
Open →Distance from velocities
Class 9 Physics
From two speeds, find the distance
Open →Diagonal of a rectangle
Class 9 Maths
Cross a rectangle corner to corner
Open →Diagonal of a cuboid
Class 9 Maths
The longest rod that fits in a box
Open →Area by Heron's formula
Class 9 Maths
Area from just the three sides
Open →Interior angle sum of a polygon
Class 8 Maths
Add up a polygon's inside angles
Open →Exterior angle of a regular polygon
Class 8 Maths
Share 360 among a polygon's corners
Open →Number of diagonals of a polygon
Class 8 Maths
Count the diagonals of a polygon
Open →Discriminant
Class 10 Maths
Test how many roots a quadratic has
Open →Sum of roots
Class 10 Maths
Sum of a quadratic's roots
Open →Punnett square (monohybrid cross)
Class 10 Biology
Cross two parents, predict the offspring
Open →Balancing chemical equations
Class 10 Chemistry
Slide coefficients until atoms balance
Open →Writing chemical formulae (valency)
Class 9 Chemistry
Criss-cross valencies into a formula
Open →Current from power
Class 10 Physics
Divide power by voltage for current
Open →Power (P = V^2 / R)
Class 10 Physics
Voltage squared over resistance
Open →Sine ratio
Class 10 Maths
Opposite over hypotenuse
Open →Cosine ratio
Class 10 Maths
Adjacent over hypotenuse
Open →Tangent ratio
Class 10 Maths
Opposite over adjacent
Open →Area of an equilateral triangle
Class 9 Maths
Area of an equilateral triangle
Open →Curved surface area of a cylinder
Class 9 Maths
Wrap only the curved side
Open →Loss percentage
Class 8 Maths
Sell below cost, find the loss %
Open →Amount with simple interest
Class 8 Maths
Principal plus its simple interest
Open →Distance formula
Class 10 Maths
Straight distance between two points
Open →States of matter
Class 9 Chemistry
Heat particles solid → liquid → gas
Open →Parts of a plant cell
Class 8 Biology
Tap a cell part to see its job
Open →Diagonal of a cube
Class 9 Maths
Longest diagonal through a cube
Open →Total surface area of a hemisphere
Class 9 Maths
Dome plus its flat circle
Open →Sum of first n natural numbers
Class 10 Maths
Add 1 + 2 + ... + n instantly
Open →Range of data
Class 9 Maths
Spread from smallest to largest
Open →Class mark
Class 9 Maths
Midpoint of a class interval
Open →Selling price from profit percent
Class 8 Maths
Mark up cost by a profit %
Open →Perimeter of a sector
Class 10 Maths
Two radii plus the curved arc
Open →Circumference from diameter
Class 8 Maths
Circumference straight from diameter
Open →Power (P = F x v)
Class 9 Physics
Force times velocity gives power
Open →Percentage of a number
Class 8 Maths
Find a percentage of a number
Open →Series and parallel circuits
Class 10 Physics
Break a bulb in series vs parallel
Open →Symbols of elements
Class 9 Chemistry
Match each element to its symbol
Open →Free fall (velocity)
Class 9 Physics
Drop from a height, hit this speed
Open →Free fall (time)
Class 9 Physics
How long a drop takes
Open →Free fall (distance)
Class 9 Physics
Distance fallen in a given time
Open →Complement of an event
Class 10 Maths
Chance an event does NOT happen
Open →Product of roots
Class 10 Maths
Product of a quadratic's roots
Open →Exterior angle theorem
Class 9 Maths
Exterior angle = sum of remote interiors
Open →Complementary angles
Class 10 Maths
What adds to 90 degrees
Open →Supplementary angles
Class 9 Maths
What adds to 180 degrees
Open →Perimeter of a semicircle
Class 10 Maths
Curved half plus the diameter
Open →Area of a semicircle
Class 10 Maths
Half the area of a circle
Open →Turning effect (moments)
Class 9 Physics
Balance the see-saw with moments
Open →Reflex arc
Class 10 Biology
Step through a reflex, stimulus to action
Open →Buoyant force (upthrust)
Class 9 Physics
Displace liquid, feel the upthrust
Open →Relative density
Class 9 Physics
Compare a density to water's
Open →Power in lifting a load
Class 9 Physics
Lift a load, faster needs more power
Open →Cosecant ratio
Class 10 Maths
Hypotenuse over opposite
Open →Secant ratio
Class 10 Maths
Hypotenuse over adjacent
Open →Cotangent ratio
Class 10 Maths
Adjacent over opposite
Open →Height from angle of elevation
Class 10 Maths
Height from an angle of elevation
Open →Area of a quadrant
Class 10 Maths
A quarter of a circle's area
Open →Interior angle of a regular polygon
Class 8 Maths
One inside angle of a regular polygon
Open →Sum of first n odd numbers
Class 10 Maths
Add the first n odd numbers
Open →Sum of first n even numbers
Class 10 Maths
Add the first n even numbers
Open →Quadratic formula (a root)
Class 10 Maths
Larger root of a quadratic
Open →LCM from HCF
Class 10 Maths
LCM from the product and HCF
Open →Depreciation
Class 8 Maths
Value drops by a % each year
Open →Cost price from selling price
Class 8 Maths
Work back to the cost price
Open →Downstream speed
Class 8 Maths
Row with the current
Open →Upstream speed
Class 8 Maths
Row against the current
Open →Average speed for a round trip
Class 8 Maths
Average speed there and back
Open →Sales tax / GST
Class 8 Maths
Tax added on a price
Open →Area of a ring (annulus)
Class 10 Maths
Area of a ring between two circles
Open →Edge of a cube from volume
Class 9 Maths
Edge back from the volume
Open →Radius from area
Class 10 Maths
Radius back from a circle's area
Open →Side from area of a square
Class 8 Maths
Side back from a square's area
Open →Height of a triangle from area
Class 9 Maths
Height back from area and base
Open →Rate from simple interest
Class 8 Maths
Rate back from the interest
Open →Time from simple interest
Class 8 Maths
Time back from the interest
Open →Principal from simple interest
Class 8 Maths
Principal back from the interest
Open →Mean proportional
Class 10 Maths
Geometric mean of two numbers
Open →Fourth proportional
Class 8 Maths
Complete the proportion a : b = c : ?
Open →Marked price from selling price
Class 8 Maths
Marked price back from the sale price
Open →Chambers of the human heart
Class 10 Biology
Tap a heart chamber to see its job
Open →Equation of a line (y = mx + c)
Class 9 Maths
Read y off a straight line
Open →Average term of an AP
Class 10 Maths
Average of first and last term
Open →Number of terms in an AP
Class 10 Maths
How many terms in an AP
Open →Midpoint of two points
Class 10 Maths
x-coordinate of a midpoint
Open →Empirical mode
Class 10 Maths
Estimate the mode from mean & median
Open →Length of a shadow
Class 10 Maths
Shadow from height and sun angle
Open →Train crossing a pole
Class 8 Maths
Speed to cross a pole
Open →Time and work
Class 8 Maths
More workers, fewer days
Open →Dividing in a ratio
Class 8 Maths
Split a total in a ratio
Open →Unitary method
Class 8 Maths
Cost of a single item
Open →Your progress — Foundation - Class 8 to 10
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Showing 212 questions for Class 10. Tap a card to reveal the answer.
PhysicsLight - Reflection and RefractioneasyWhy does a ray of light bend when it passes from air into glass?
Reveal answer ↓
What it is
Light bends (refracts) when its speed changes on moving between media of different densities.
Answer
Light bends because its speed changes when it moves from one medium to another. Glass is optically denser than air, so light slows down on entering glass and bends towards the normal. This bending of light due to a change in speed is called refraction.
n = speed in vacuum / speed in medium = c/v
- •Speed of light changes between media
- •Denser medium -> bends towards the normal
- •Governed by refractive index n = c/v
Why learn this
It's why lenses, spectacles, cameras and your own eye can focus - the basis of all optics.
💡 Memory trick
Enter a denser medium -> slow down -> bend TOWARDS the normal (like a car hitting mud).
PhysicsLight - Reflection and RefractionmediumState the mirror formula and the sign convention used for a concave mirror.
Reveal answer ↓
What it is
The mirror formula links focal length, object distance and image distance for a curved mirror.
Answer
The mirror formula relates focal length f, image distance v and object distance u as 1/f = 1/v + 1/u. By the New Cartesian sign convention, distances are measured from the pole; distances measured against the incident light (to the left) are negative, so for a concave mirror f and u are negative, and a real image distance v is also negative.
1/f = 1/v + 1/u ; m = -v/u
- •1/f = 1/v + 1/u
- •Distances measured from the pole (P)
- •Concave mirror focal length is negative
- •Magnification m = -v/u = h'/h
Why learn this
It's how we design car mirrors, telescopes, torches and a dentist's mirror.
💡 Memory trick
1/f = 1/v + 1/u. In New Cartesian signs, left-of-mirror distances are negative.
PhysicsElectricityeasyState Ohm's law and define electrical resistance.
Reveal answer ↓
What it is
For a conductor at steady temperature, voltage = current x resistance (V = IR).
I = V / R = 6 / 3 = 2.00 A
Answer
Ohm's law states that, at constant temperature, the current I through a conductor is directly proportional to the potential difference V across it, so V = IR. Resistance R is the property of a conductor that opposes the flow of current; it is the ratio of potential difference to current, R = V/I, measured in ohm.
V = IR ; R = V/I
- •V is proportional to I at constant temperature
- •V = IR
- •R = V/I, unit ohm
- •Resistance opposes current flow
Why learn this
It's the single most-used rule in all electrical and electronics engineering.
💡 Memory trick
V = IR - the 'VIR' triangle: cover the one you want to find.
PhysicsElectricitymediumA current of 2 A flows through a 5 ohm resistor. Find the potential difference across it and the power dissipated.
Reveal answer ↓
What it is
Electric power is the rate of using electrical energy: P = VI (also I^2 R or V^2 / R).
Answer
Using Ohm's law, V = IR = 2 x 5 = 10 V. Power dissipated P = VI = 10 x 2 = 20 W (equivalently P = I^2 R = 4 x 5 = 20 W).
V = IR ; P = VI = I^2 R = V^2 / R
- •V = IR = 10 V
- •P = VI = 20 W
- •Check: P = I^2 R = 20 W
Why learn this
It's what your electricity bill charges for and why a heater draws far more than a phone charger.
💡 Memory trick
P = VI. If you know current and resistance, use P = I^2 R ('I-squared-R heating').
PhysicsMagnetic Effects of Electric CurrenteasyState the right-hand thumb rule for the magnetic field around a straight current-carrying wire.
Reveal answer ↓
What it is
A current in a straight wire creates circular magnetic field lines around it.
Answer
If you hold the straight conductor in your right hand with the thumb pointing in the direction of the current, the curled fingers show the direction of the concentric circular magnetic field lines around the wire.
- •Thumb -> direction of current
- •Curled fingers -> direction of field
- •Field lines are concentric circles around the wire
Why learn this
It's the principle behind electromagnets, electric motors, bells and MRI machines.
💡 Memory trick
Right hand: thumb = current, curled fingers = the circular magnetic field.
ChemistryChemical Reactions and EquationseasyWhen an iron nail is dipped in copper sulphate solution, the blue colour fades. Write the reaction and name its type.
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ChemistryAcids, Bases and SaltseasyWhat is the pH scale, and how does pH change as a solution becomes more acidic?
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ChemistryMetals and Non-metalsmediumZinc can displace copper from copper sulphate, but copper cannot displace zinc from zinc sulphate. Explain.
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ChemistryCarbon and its CompoundsmediumWhy does carbon form a very large number of compounds?
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ChemistryChemical Reactions and EquationsmediumIn the reaction CuO + H2 -> Cu + H2O, identify the substance oxidised and the substance reduced.
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BiologyLife ProcesseseasyHow is oxygen transported from the lungs to the tissues in human beings?
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BiologyLife ProcesseseasyGive two differences between arteries and veins.
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BiologyControl and CoordinationmediumWhat is a reflex arc? Trace the path of a reflex action when you touch a hot object.
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BiologyHow do Organisms ReproducemediumWhy does sexual reproduction produce more variation than asexual reproduction?
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BiologyHeredity and EvolutionmediumIn a monohybrid cross between a tall pea plant (TT) and a short pea plant (tt), what is the ratio of tall to short plants in the F2 generation? Explain briefly.
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MathematicsReal NumbersmediumFind the HCF of 96 and 404 using Euclid's division algorithm.
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MathematicsPolynomialseasyFind the zeroes of the polynomial x^2 - 7x + 10 and verify the relationship between the zeroes and the coefficients.
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MathematicsPair of Linear Equations in Two VariablesmediumSolve the pair of equations: 2x + 3y = 13 and x - y = -1.
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MathematicsQuadratic EquationsmediumFind the roots of x^2 - 5x + 6 = 0 and state the nature of the roots using the discriminant.
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MathematicsArithmetic ProgressionseasyThe first term of an AP is 3 and the common difference is 5. Find its 10th term.
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MathematicsArithmetic ProgressionsmediumFind the sum of the first 20 terms of the AP 2, 5, 8, 11, ...
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MathematicsTrianglesmediumState the Basic Proportionality Theorem (Thales' theorem).
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MathematicsCoordinate GeometryeasyFind the distance between the points (2, 3) and (5, 7).
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MathematicsIntroduction to TrigonometrymediumIf sin(theta) = 3/5, find cos(theta) and tan(theta), where theta is acute.
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MathematicsSome Applications of TrigonometrymediumThe angle of elevation of the top of a tower from a point 30 m from its base is 30 degrees. Find the height of the tower.
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MathematicsCirclesmediumA point P is 13 cm from the centre of a circle of radius 5 cm. Find the length of the tangent drawn from P to the circle.
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MathematicsSurface Areas and VolumeseasyFind the volume of a cone whose base radius is 3 cm and height is 4 cm. (Take pi = 22/7.)
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MathematicsStatisticsmediumThe mean of a distribution is 27 and its median is 30. Estimate the mode using the empirical relationship.
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MathematicsProbabilityeasyOne card is drawn at random from a well-shuffled deck of 52 playing cards. What is the probability that it is a king?
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MathematicsIntroduction to TrigonometrymediumEvaluate 2 tan^2(45 degrees) + cos^2(30 degrees) - sin^2(60 degrees).
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PhysicsLight - Reflection and RefractionmediumA convex lens has a focal length of 25 cm. Find its power.
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PhysicsThe Human Eye and the Colourful WorldmediumWhy does the clear sky appear blue?
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ChemistryAcids, Bases and SaltseasyWhat is a neutralisation reaction? Give the general equation and one everyday use.
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ChemistryCarbon and its CompoundsmediumWhat is a homologous series? State two of its characteristics.
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BiologyLife ProcessesmediumWhat is photosynthesis? Write its balanced equation and the conditions needed.
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BiologyOur EnvironmentmediumWhat is a food chain? State the ten percent law of energy transfer.
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PhysicsElectricitymediumHow is the total resistance calculated for resistors joined in series and in parallel?
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PhysicsThe Human Eye and the Colourful WorldmediumWhy does the clear sky appear blue?
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PhysicsMagnetic Effects of Electric CurrentmediumWhat is electromagnetic induction, and how can the induced current be increased?
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ChemistryChemical Reactions and EquationsmediumName the four main types of chemical reactions and give one example of each.
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ChemistryMetals and Non-metalsmediumWhat is the reactivity series of metals, and why is it useful?
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ChemistryCarbon and its CompoundsmediumWhy does carbon form a very large number of compounds?
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BiologyControl and CoordinationmediumWhat is a reflex action? Trace the pathway of a reflex arc.
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BiologyHeredity and EvolutionmediumIn a cross between two Tt pea plants, what offspring ratio is expected, and why?
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BiologyLife ProcesseseasyGive three differences between arteries and veins.
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PhysicsLight - Reflection and RefractionmediumA convex lens has a focal length of 0.5 m. Find its power. Slide the focal length to explore.
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BiologyOur EnvironmenteasyIf 500 deer live in a 25 km^2 forest, what is the population density? Slide to explore.
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MathematicsProbabilityeasyWhat is the probability of rolling a 4 on a fair die? Change the outcomes to explore.
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PhysicsLight - Reflection and RefractionmediumLight slows to 2 x 10^8 m/s in a medium (c = 3 x 10^8 m/s). Find the refractive index. Slide to explore.
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PhysicsElectricityeasyTwo resistors of 10 ohm and 20 ohm are connected in series. Find the total resistance. Slide to explore.
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BiologyOur EnvironmenteasyA population of 500 has 60 births and 40 deaths in a year. Find the new population. Slide to explore.
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ChemistryCarbon and its CompoundsmediumHow are alkanes named as the carbon chain grows? Slide the number of carbon atoms to explore.
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PhysicsElectricityeasy30 C of charge flows past a point in 60 s. Find the current. Slide to explore.
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PhysicsElectricitymediumA current of 2 A flows through a 5 ohm resistor. Find the power dissipated. Slide to explore.
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BiologyLife ProcesseseasyAt 72 beats per minute, how many times does the heart beat in 10 minutes? Slide to explore.
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PhysicsElectricitymediumTwo resistors of 10 ohm and 20 ohm are connected in parallel. Find the total resistance. Slide to explore.
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PhysicsElectricityeasyA current of 2 A flows for 30 s. How much charge passes? Slide to explore.
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PhysicsElectricitymediumA 1000 W heater runs for 5 hours. How many units (kWh) does it use? Slide to explore.
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BiologyOur EnvironmenteasyIf a level has 1000 units of energy, how much reaches the next level? Slide to explore.
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PhysicsElectricitymedium60 J of work moves 5 C of charge between two points. Find the potential difference. Slide to explore.
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PhysicsElectricityeasyA voltage of 12 V drives a current of 2 A. Find the resistance. Slide to explore.
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BiologyLife ProcesseseasyAt 16 breaths per minute, how many breaths are taken in 10 minutes? Slide to explore.
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MathematicsSurface Areas and VolumesmediumFind the volume of a cylinder of radius 3 and height 7 units (pi = 3.14159). Slide to explore.
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MathematicsSurface Areas and VolumesmediumFind the surface area of a sphere of radius 7 units (pi = 3.14159). Slide to explore.
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BiologyOur EnvironmentmediumA population of 500 has 60 births and 40 deaths in a year. Find the growth rate. Slide to explore.
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PhysicsElectricitymediumFind the heat produced by a 2 A current in a 5 ohm resistor for 10 s. Slide to explore.
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PhysicsElectricityeasyA device runs at 12 V and draws 2 A. Find its power. Slide to explore.
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MathematicsArithmetic ProgressionsmediumFind the 5th term of the AP starting at 2 with common difference 3. Slide to explore.
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MathematicsArithmetic ProgressionsmediumFind the sum of the first 5 terms of the AP starting at 2 with common difference 3. Slide to explore.
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PhysicsLight - Reflection and RefractioneasyA spherical mirror has a radius of curvature of 40 cm. Find its focal length. Slide to explore.
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PhysicsLight - Reflection and RefractionmediumHow fast does light travel in glass (n = 1.5), given c = 3 x 10^8 m/s? Slide to explore.
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MathematicsCoordinate GeometrymediumA line rises 6 units over a run of 3 units. Find its slope. Slide to explore.
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MathematicsAreas Related to CirclesmediumFind the area of a 90 degree sector of a circle of radius 7 units (pi = 3.14159). Slide to explore.
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MathematicsAreas Related to CirclesmediumFind the length of a 90 degree arc of a circle of radius 7 units (pi = 3.14159). Slide to explore.
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PhysicsElectricityeasyA home uses 100 units at 6 rupees per unit. Find the bill. Slide the values to explore.
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MathematicsQuadratic EquationsmediumFind the discriminant of x^2 + 5x + 6 = 0. Slide a, b and c to explore.
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MathematicsQuadratic EquationsmediumFind the sum of the roots of x^2 - 5x + 6 = 0. Slide a and b to explore.
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BiologyHeredity and EvolutionmediumWhat offspring do you get when you cross two tall pea plants that are both Tt? Pick the parents to explore.
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ChemistryChemical Reactions and EquationsmediumHow do you balance H2 + O2 -> H2O? Slide the coefficients until both sides match.
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PhysicsElectricityeasyA 1100 W appliance runs on 220 V. What current does it draw? Slide to explore.
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PhysicsElectricitymediumFind the power of a 484 ohm element on 220 V. Slide to explore.
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MathematicsIntroduction to TrigonometrymediumIn a right triangle the opposite side is 3 and the hypotenuse is 5. Find sin of the angle. Slide to explore.
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MathematicsIntroduction to TrigonometrymediumIn a right triangle the adjacent side is 4 and the hypotenuse is 5. Find cos of the angle. Slide to explore.
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MathematicsIntroduction to TrigonometrymediumIn a right triangle the opposite side is 3 and the adjacent side is 4. Find tan of the angle. Slide to explore.
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MathematicsCoordinate GeometrymediumFind the distance between (0, 0) and (3, 4). Slide the coordinates to explore.
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MathematicsArithmetic ProgressionseasyFind the sum 1 + 2 + 3 + ... + 10. Slide n to explore.
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MathematicsAreas Related to CirclesmediumFind the perimeter of a 90 degree sector of radius 7 units (pi = 3.14159). Slide to explore.
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PhysicsElectricitymediumWhat happens to the other bulb when one bulb fails, in series versus parallel? Flip the wiring and break a bulb to explore.
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MathematicsProbabilityeasyWhat is the probability of NOT rolling a 4 on a die? Change the outcomes to explore.
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MathematicsQuadratic EquationsmediumFind the product of the roots of x^2 - 5x + 6 = 0. Slide a and c to explore.
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MathematicsIntroduction to TrigonometryeasyWhat is the complement of a 30 degree angle? Slide the angle to explore.
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MathematicsAreas Related to CirclesmediumFind the perimeter of a semicircle of radius 7 units (pi = 3.14159). Slide to explore.
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MathematicsAreas Related to CircleseasyFind the area of a semicircle of radius 7 units (pi = 3.14159). Slide to explore.
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BiologyControl and CoordinationmediumWhat is the pathway of a reflex action when you touch a hot object? Step through it to explore.
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MathematicsIntroduction to TrigonometrymediumIn a right triangle the hypotenuse is 5 and the opposite side is 3. Find cosec of the angle. Slide to explore.
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MathematicsIntroduction to TrigonometrymediumIn a right triangle the hypotenuse is 5 and the adjacent side is 4. Find sec of the angle. Slide to explore.
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MathematicsIntroduction to TrigonometrymediumIn a right triangle the adjacent side is 4 and the opposite side is 3. Find cot of the angle. Slide to explore.
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MathematicsSome Applications of TrigonometrymediumFrom 50 m away, the top of a tower has an angle of elevation of 30 degrees. Find its height. Slide to explore.
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MathematicsAreas Related to CircleseasyFind the area of a quadrant of radius 7 units (pi = 3.14159). Slide to explore.
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MathematicsArithmetic ProgressionseasyFind 1 + 3 + 5 + 7 + 9. Slide how many odd numbers to explore.
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