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 201 questions for Class 9. Tap a card to reveal the answer.
PhysicsMotionmediumA car starting from rest accelerates uniformly at 2 m/s^2 for 5 seconds. Find its final velocity and the distance travelled.
Reveal answer ↓
What it is
The three equations of motion connect initial velocity, acceleration, time, distance and final velocity for steady acceleration.
Answer
Given u = 0, a = 2 m/s^2, t = 5 s. Final velocity v = u + at = 0 + 2 x 5 = 10 m/s. Distance s = ut + (1/2)at^2 = 0 + (1/2)(2)(5^2) = 25 m. So the car reaches 10 m/s and covers 25 m.
v = u + at ; s = ut + (1/2)at^2
- •v = u + at = 10 m/s
- •s = ut + (1/2)at^2 = 25 m
- •u = 0 (starts from rest)
Why learn this
They let engineers predict a rocket's speed, a car's braking distance and a ball's flight - the maths of all moving things.
💡 Memory trick
Use 'v = u + at' first (no distance), then 's = ut + 1/2 at^2'. Velocity gets a time-boost 'at'.
PhysicsForce and Laws of MotionmediumState Newton's second law of motion and define momentum.
Reveal answer ↓
What it is
Force is what changes an object's momentum; for a fixed mass, force = mass x acceleration.
Answer
Newton's second law states that the rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction of the force; for constant mass this gives F = ma. Momentum is the quantity of motion of a body, equal to the product of its mass and velocity, p = mv.
F = ma ; p = mv
- •Rate of change of momentum is proportional to force
- •F = ma (for constant mass)
- •Momentum p = mv
- •Change is in the direction of the force
Why learn this
It's why seatbelts and airbags save lives, and how rockets and cricket shots are designed.
💡 Memory trick
F = ma ('Force = Mass Accelerates'); momentum p = mv is 'mass in motion'.
PhysicsGravitationmediumState the universal law of gravitation and write its formula.
Reveal answer ↓
What it is
Every mass attracts every other mass with a force that grows with mass and shrinks fast with distance.
Answer
The universal law of gravitation states that every body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. The force F = G m1 m2 / r^2, where G is the universal gravitational constant.
F = G m1 m2 / r^2
- •Force is proportional to m1 x m2
- •Force is inversely proportional to r^2
- •F = G m1 m2 / r^2
- •G is the gravitational constant
Why learn this
It keeps the Moon orbiting, satellites up and explains your weight - the law that runs the universe.
💡 Memory trick
More mass = more pull; double the distance = one-quarter the pull (inverse SQUARE).
PhysicsWork and EnergymediumDefine work done by a force and state the formula for kinetic energy.
Reveal answer ↓
What it is
Work is force times the distance moved along it; a moving object stores that work as kinetic energy.
Answer
Work is done when a force acts on a body and the body moves in the direction of the force; work done W = F s cos(theta), where s is the displacement and theta is the angle between the force and the displacement. Kinetic energy is the energy possessed by a body due to its motion and is given by KE = (1/2) m v^2. The unit of both work and energy is the joule.
W = F s cos(theta) ; KE = (1/2) m v^2
- •Work needs force and displacement along it
- •W = F s cos(theta)
- •Kinetic energy KE = (1/2) m v^2
- •Unit is the joule (J)
Why learn this
It underlies electricity bills (energy) and how a dam, a bow-and-arrow or a moving car works.
💡 Memory trick
No movement, no work. KE = 1/2 m v^2 - double the speed, FOUR times the energy.
ChemistryMatter in Our SurroundingsmediumWhy does evaporation cause cooling?
Reveal answer ↓
What it is
When the fastest particles escape a liquid's surface, the particles left behind are cooler.
Answer
During evaporation the fastest-moving (most energetic) particles at the surface of a liquid escape into the air. This lowers the average kinetic energy of the remaining particles, so the temperature of the liquid falls. The escaping particles also absorb latent heat from the surroundings, which is why evaporation produces a cooling effect - for example, sweating cools our body.
- •Fast (energetic) particles leave the surface
- •Remaining particles have lower average energy
- •Latent heat absorbed from surroundings
- •Example: sweating cools the body
Why learn this
It's why sweating, earthen pots (matka) and desert coolers keep things cold without a fridge.
💡 Memory trick
The 'hot-heads' leave first, so what's left behind is cooler.
ChemistryIs Matter Around Us PuremediumGive two differences between a mixture and a compound.
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ChemistryAtoms and MoleculesmediumState the law of conservation of mass with an example.
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ChemistryStructure of the AtomeasyDefine the atomic number and the mass number of an atom.
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BiologyThe Fundamental Unit of LifemediumGive two differences between a prokaryotic and a eukaryotic cell.
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BiologyTissuesmediumWhat is meristematic tissue and where is it found in plants?
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BiologyImprovement in Food ResourcesmediumWhat is the difference between mixed cropping and intercropping?
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BiologyNatural ResourceseasyWhy is the atmosphere important for life on Earth?
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MathematicsNumber SystemsmediumRationalise the denominator of 1 / sqrt(2).
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MathematicsPolynomialsmediumUsing the remainder theorem, find the remainder when p(x) = x^3 + 3x^2 + 3x + 1 is divided by (x + 1).
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MathematicsLinear Equations in Two VariableseasyWhere does the line x + y = 5 meet the x-axis and the y-axis?
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MathematicsHeron's FormulamediumFind the area of a triangle whose sides are 3 cm, 4 cm and 5 cm using Heron's formula.
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PhysicsSoundmediumWhat is an echo, and what is the minimum distance needed to hear one clearly?
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ChemistryIs Matter Around Us PuremediumWhat is the Tyndall effect, and what does it tell us about a mixture?
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BiologyThe Fundamental Unit of LifemediumWhat is osmosis? What happens to a cell placed in pure water?
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MathematicsSurface Areas and VolumesmediumFind the volume of a sphere of radius 7 cm. (Take pi = 22/7.)
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PhysicsGravitationmediumState Archimedes' principle. Why does an iron nail sink but an iron ship float?
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ChemistryStructure of the AtommediumWhat are isotopes? Give one example.
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BiologyTissuesmediumWhat are xylem and phloem? State the function of each.
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MathematicsStatisticseasyFind the mean of the data: 10, 15, 20, 25, 30.
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BiologyDiversity in Living OrganismseasyWhat is classification, and what is the sequence of the main groups used?
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PhysicsGravitationmediumA block has a mass of 200 g and a volume of 50 cm^3. Find its density and decide if it floats in water.
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PhysicsWork and EnergyeasyA force of 20 N moves a box 5 m in its direction. How much work is done? Slide to explore.
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PhysicsWork and EnergymediumFind the kinetic energy of a 2 kg body moving at 5 m/s, then try doubling the speed.
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ChemistryAtoms and MoleculesmediumHow many moles are there in 36 g of water (molar mass 18 g/mol)? Slide to explore.
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ChemistryAtoms and MoleculesmediumHow many molecules are there in 1 mole? And in 2 moles? Slide to explore.
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MathematicsTrianglesmediumThe two shorter sides of a right triangle are 3 and 4. Find the hypotenuse. Slide to explore.
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PhysicsForce and Laws of MotionmediumWhat force gives a 10 kg body an acceleration of 5 m/s^2? Slide to explore.
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PhysicsForce and Laws of MotionmediumFind the momentum of a 10 kg body moving at 5 m/s. Slide the values to explore.
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PhysicsGravitationeasyFind the weight of a 10 kg body on Earth (g = 9.8 m/s^2), then try the Moon. Slide g to explore.
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ChemistryIs Matter Around Us Puremedium20 g of salt is dissolved to make 100 g of solution. Find the mass percentage. Slide to explore.
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ChemistryIs Matter Around Us Pureeasy20 g of solute is dissolved in 2 L of solution. Find the concentration. Slide to explore.
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ChemistryStructure of the AtommediumHow do you write the electronic configuration and find the valency of an element? Slide the atomic number from H to Ca to explore.
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ChemistryStructure of the AtomeasyAn atom has 6 protons and 6 neutrons. Find its mass number. Slide to explore.
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PhysicsWork and Energymedium200 J of work is done in 10 s. Find the power. Slide the values to explore.
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PhysicsWork and EnergymediumFind the potential energy of a 2 kg body raised 10 m (g = 9.8 m/s^2). Slide to explore.
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PhysicsSoundmediumA wave has a frequency of 500 Hz and a wavelength of 0.5 m. Find its speed. Slide to explore.
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ChemistryStructure of the AtommediumHow do you draw the electron dot structure of an element? Slide the atomic number to explore.
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PhysicsMotionmediumA body speeds up from 0 to 20 m/s in 5 s. Find its acceleration. Slide the values to explore.
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PhysicsSoundeasyA vibration has a time period of 0.5 s. Find its frequency. Slide the period to explore.
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MathematicsStatisticseasyFive values add up to 250. Find their mean. Slide the values to explore.
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ChemistryMatter in Our SurroundingseasyConvert 25 C to the Kelvin scale. Slide the temperature to explore.
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ChemistryAtoms and MoleculesmediumHow many moles are 6.022 x 10^23 particles? And 1.2 x 10^24? Slide to explore.
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MathematicsSurface Areas and VolumeseasyFind the surface area of a cube of side 4 units. Slide the side to explore.
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PhysicsSoundmediumAn echo returns in 2 s where sound travels at 340 m/s. How far is the surface? Slide to explore.
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ChemistryAtoms and MoleculesmediumWhat is the mass of 2 moles of water (molar mass 18 g/mol)? Slide to explore.
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PhysicsSoundeasyA vibration has a frequency of 2 Hz. Find its time period. Slide the frequency to explore.
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PhysicsMotionmediumTwo cars approach each other at 20 m/s and 10 m/s. How fast do they close in? Slide to explore.
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PhysicsMotioneasyA body speeds up from 10 m/s to 30 m/s uniformly. Find its average velocity. Slide to explore.
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PhysicsMotionmediumA body starts at 5 m/s and accelerates at 2 m/s^2 for 5 s. Find its final velocity. Slide to explore.
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ChemistryMatter in Our SurroundingseasyConvert 300 K to the Celsius scale. Slide the temperature to explore.
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PhysicsMotionmediumA body starts at 10 m/s and accelerates at 2 m/s^2 for 5 s. How far does it go? Slide to explore.
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ChemistryStructure of the AtommediumChlorine is 75% mass-35 and 25% mass-37. Find its average atomic mass. Slide to explore.
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BiologyImprovement in Food ResourceseasyIf 40 out of 50 sown seeds sprout, what is the germination percentage? Slide to explore.
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MathematicsSurface Areas and VolumesmediumFind the volume of a cone of radius 3 and height 7 units (pi = 3.14159). Slide to explore.
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MathematicsSurface Areas and VolumesmediumFind the total surface area 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 cuboid 3 x 4 x 5 units. Slide the dimensions to explore.
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ChemistryIs Matter Around Us PureeasyA 100 g sample contains 90 g of pure substance. Find its percentage purity. Slide to explore.
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MathematicsSurface Areas and VolumesmediumFind the volume of a hemisphere of radius 6 units (pi = 3.14159). Slide to explore.
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MathematicsSurface Areas and VolumesmediumA cone has radius 3 and height 4 units. Find its slant height. Slide to explore.
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PhysicsMotioneasyConvert 72 km/h into metres per second. Slide the speed to explore.
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PhysicsMotionmediumA body starts at 10 m/s and accelerates at 2 m/s^2 over 100 m. Find its final velocity. Slide to explore.
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PhysicsForce and Laws of MotionmediumA force of 20 N acts for 2 s. Find the impulse. Slide the values to explore.
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PhysicsSoundeasyA sound wave travels at 340 m/s with a frequency of 200 Hz. Find its wavelength. Slide to explore.
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PhysicsSoundeasyHow many oscillations does a 50 Hz vibration make in 10 s? Slide to explore.
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ChemistryStructure of the AtomeasyAn atom has mass number 12 and atomic number 6. How many neutrons does it have? Slide to explore.
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MathematicsSurface Areas and VolumesmediumFind the curved surface area of a cone with radius 3 and slant height 5 units (pi = 3.14159). Slide to explore.
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MathematicsSurface Areas and VolumesmediumFind the total surface area of a cone with radius 3 and slant height 5 units (pi = 3.14159). Slide to explore.
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MathematicsSurface Areas and VolumeseasyFind the curved surface area of a hemisphere of radius 6 units (pi = 3.14159). Slide to explore.
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MathematicsMensurationeasyFind the diagonal of a square of side 10 units. Slide the side to explore.
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PhysicsMotioneasyConvert 20 m/s into kilometres per hour. Slide the speed to explore.
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PhysicsMotionmediumA body goes from 10 m/s to 30 m/s at 2 m/s^2. Find the distance covered. Slide to explore.
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MathematicsMensurationeasyFind the diagonal of a rectangle 3 by 4 units. Slide the sides to explore.
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MathematicsSurface Areas and VolumesmediumFind the longest diagonal of a cuboid 3 x 4 x 12 units. Slide the dimensions to explore.
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MathematicsHeron's FormulamediumFind the area of a triangle with sides 3, 4 and 5 units using Heron's formula. Slide to explore.
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ChemistryAtoms and MoleculesmediumHow do you write the formula of calcium chloride? Pick the ions to criss-cross their valencies.
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MathematicsHeron's FormulamediumFind the area of an equilateral triangle of side 6 units. Slide the side to explore.
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MathematicsSurface Areas and VolumeseasyFind the curved surface area of a cylinder with radius 3 and height 7 units (pi = 3.14159). Slide to explore.
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ChemistryMatter in Our SurroundingseasyHow do the particles change as a solid is heated into a liquid and then a gas? Slide the heat to explore.
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MathematicsSurface Areas and VolumesmediumFind the longest diagonal of a cube of side 5 units. Slide the side to explore.
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MathematicsSurface Areas and VolumesmediumFind the total surface area of a solid hemisphere of radius 6 units (pi = 3.14159). Slide to explore.
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MathematicsStatisticseasyA data set has a highest value of 80 and a lowest of 20. Find the range. Slide to explore.
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MathematicsStatisticseasyFind the class mark of the interval 10 to 20. Slide the limits to explore.
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PhysicsWork and EnergymediumA force of 20 N moves an object at 5 m/s. Find the power. Slide to explore.
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ChemistryAtoms and MoleculeseasyCan you match each element to its correct symbol? Tap the right symbol to score.
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PhysicsGravitationmediumHow fast is a body moving after falling 20 m (g = 9.8 m/s^2)? Slide the height to explore.
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PhysicsGravitationmediumHow long does a body take to fall 20 m (g = 9.8 m/s^2)? Slide the height to explore.
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PhysicsGravitationmediumHow far does a dropped body fall in 3 s (g = 9.8 m/s^2)? Slide the time to explore.
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MathematicsTriangleseasyTwo interior angles of a triangle are 60 and 70 degrees. Find the exterior angle at the third vertex. Slide to explore.
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MathematicsLines and AngleseasyWhat is the supplement of a 60 degree angle? Slide the angle to explore.
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PhysicsForce and Laws of MotionmediumHow do you balance a see-saw with different weights? Slide the weights and distances to explore.
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PhysicsGravitationmediumFind the upthrust on an object that displaces 10 L of water (density 1000 kg/m^3, g = 9.8). Slide to explore.
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PhysicsGravitationeasyFind the relative density of aluminium (density 2700 kg/m^3). Slide the density to explore.
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PhysicsWork and EnergymediumFind the power to lift 50 kg through 10 m in 10 s (g = 9.8). Slide to explore.
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MathematicsSurface Areas and VolumesmediumA cube has a volume of 64 cubic units. Find its edge. Slide the volume to explore.
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MathematicsMensurationeasyA triangle has an area of 40 square units and a base of 10. Find its height. Slide to explore.
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