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 173 questions for Class 8. Tap a card to reveal the answer.
PhysicsForce and PressureeasyA sharp knife cuts better than a blunt one. Explain using the idea of pressure.
Reveal answer ↓
What it is
Pressure is how concentrated a force is - the same push on a smaller area presses much harder.
Answer
Pressure is the force acting on a unit area, P = F/A. A sharp knife has a very small area at its edge, so for the same force the pressure it exerts is much greater, and it cuts easily. A blunt knife has a larger edge area, so the same force produces less pressure and cuts poorly.
P = F / A
- •Pressure = force / area (P = F/A)
- •Smaller area -> greater pressure
- •Sharp edge = small area = high pressure
Why learn this
It explains sharp knives, nails, a camel's wide feet on sand, and why a thin bag strap hurts your shoulder.
💡 Memory trick
Same force, Smaller area = Stronger press - the three S's.
PhysicsFrictionmediumWhy is friction called a necessary evil?
Reveal answer ↓
What it is
Friction is the grip between two surfaces that resists sliding.
Answer
Friction is called a necessary evil because it is both useful and harmful. It is necessary as it lets us walk, hold objects, write and stop vehicles. It is an evil because it wears out machine parts and shoe soles and produces heat that wastes energy. So we increase it where needed (treads, brakes) and reduce it where it wastes energy (lubricants, ball bearings).
- •Useful: walking, gripping, braking, writing
- •Harmful: wear and tear, heat, energy loss
- •Increase with treads/brakes; reduce with lubricants/ball bearings
Why learn this
Without it you couldn't walk, write or brake; too much of it wastes fuel and wears parts out.
💡 Memory trick
Friction is a Friend that also causes Fiction (trouble).
PhysicsSoundeasyHow is sound produced, and why can it not travel through vacuum?
Reveal answer ↓
What it is
Sound is a vibration that travels by shaking the particles of a medium.
Answer
Sound is produced by vibrating objects; the vibrations push the particles of the surrounding medium, creating compressions and rarefactions that travel outward as a wave. Sound needs a material medium (solid, liquid or gas) because it moves by making particles vibrate. In a vacuum there are no particles, so sound cannot travel.
- •Produced by vibration
- •Travels as compressions and rarefactions
- •Needs a material medium
- •Cannot travel in vacuum (no particles)
Why learn this
It's why space is silent for astronauts and why you hear an approaching train through the rails first.
💡 Memory trick
No particles, no sound - a vacuum means silence.
PhysicsChemical Effects of Electric CurrentmediumWhat is electroplating? Give one use of it.
Reveal answer ↓
What it is
Electroplating uses electricity to coat one metal with a thin layer of another.
Answer
Electroplating is the process of depositing a layer of one metal over another using electricity (the chemical effect of electric current). When current passes through a solution of a metal salt, metal ions are deposited on the object connected to the negative terminal. It is used to coat iron with chromium or nickel to prevent rusting and to make cheap ornaments look like gold or silver.
- •Depositing one metal over another using electricity
- •Uses the chemical effect of current
- •Object at negative terminal gets coated
- •Used to prevent rusting and for jewellery
Why learn this
It stops rusting (chrome on bikes and taps) and makes cheap jewellery look like gold or silver.
💡 Memory trick
Electro-PLATE = electricity lays a PLATE of metal on top.
ChemistryMaterials: Metals and Non-MetalseasyState two physical properties that distinguish metals from non-metals.
Reveal answer ↓
What it is
Metals are shiny, bendable conductors of heat and electricity; non-metals are dull, brittle insulators.
Answer
Metals are generally lustrous (shiny), malleable and ductile, good conductors of heat and electricity, and sonorous. Non-metals are usually dull, brittle (break easily) and poor conductors of heat and electricity. For example, iron is a shiny conductor while sulphur is a dull, brittle insulator.
- •Metals: lustrous, malleable, ductile, good conductors, sonorous
- •Non-metals: dull, brittle, poor conductors
- •Example: iron (metal) vs sulphur (non-metal)
Why learn this
It's why wires are made of copper (a metal) and a matchstick tip uses sulphur (a non-metal).
💡 Memory trick
Metals join the 'MSC' club: Malleable, Shiny, Conductors.
ChemistryCombustion and FlamemediumWhat three conditions are necessary for combustion to take place?
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ChemistryCoal and PetroleumeasyWhy are coal and petroleum called fossil fuels, and why should we use them carefully?
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ChemistrySynthetic Fibres and PlasticsmediumWhy is the disposal of plastic a serious environmental problem?
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BiologyCell Structure and FunctionseasyGive two differences between a plant cell and an animal cell.
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BiologyMicroorganisms: Friend and FoeeasyName two useful and two harmful micro-organisms and state what they do.
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BiologyCrop Production and ManagementmediumWhat is the difference between manure and fertiliser?
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BiologyReaching the Age of AdolescencemediumWhat are secondary sexual characters, and which glands control them?
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MathematicsLinear Equations in One VariableeasySolve the linear equation 3x + 5 = 20.
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MathematicsSquares and Square RootsmediumFind the square root of 1225 by prime factorisation.
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MathematicsExponents and PowersmediumExpress 0.0000073 in standard (scientific) form.
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MathematicsComparing QuantitieseasyA shopkeeper buys a bag for 500 rupees and sells it for 575 rupees. Find the profit percent.
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PhysicsLighteasyState the two laws of reflection of light.
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ChemistryPollution of Air and WatermediumWhat is the greenhouse effect and why is it a concern today?
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BiologyReproduction in AnimalseasyWhat is the difference between oviparous and viviparous animals? Give one example of each.
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MathematicsAlgebraic Expressions and IdentitiesmediumUse a standard identity to expand (x + 5)^2.
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PhysicsSome Natural PhenomenamediumWhat causes lightning, and how does a lightning conductor protect a building?
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ChemistryCombustion and FlamemediumWhat are the characteristics of a good fuel?
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BiologyConservation of Plants and AnimalseasyWhat is biodiversity, and why should it be conserved?
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MathematicsMensurationmediumFind the area of a trapezium whose parallel sides are 12 cm and 8 cm and whose height is 5 cm.
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PhysicsMotion and TimeeasyA car travels 60 m in 10 s. What is its speed? Slide the values to explore.
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BiologyCell - Structure and FunctionseasyUnder a microscope a 6 mm object appears 60 mm long. What is the magnification? Slide to explore.
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MathematicsComparing QuantitieseasyFind the simple interest on 2000 at 5% per year for 3 years. Slide the values to explore.
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PhysicsForce and PressureeasyA force of 100 N acts on an area of 2 m^2. Find the pressure. Slide to explore.
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BiologyCell - Structure and FunctionseasyA microscope has a 10x eyepiece and a 40x objective. Find the total magnification. Slide to explore.
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MathematicsMensurationeasyFind the area of a circle of radius 7 units (take pi = 3.14159). Slide the radius to explore.
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MathematicsMensurationeasyFind the volume of a cuboid 3 x 4 x 5 units. Slide the dimensions to explore.
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MathematicsComparing QuantitieseasyA student scores 45 out of 180. What percentage is that? Slide the values to explore.
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PhysicsMotion and TimeeasyHow far does a body going 10 m/s travel in 30 s? Slide the values to explore.
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MathematicsMensurationeasyFind the area of a triangle with base 10 and height 8 units. Slide to explore.
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MathematicsMensurationeasyFind the area of a rectangle 5 units long and 4 units wide. Slide to explore.
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MathematicsComparing QuantitieseasyA 2000 item has a 25% discount. How much do you save? Slide the values to explore.
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MathematicsMensurationeasyFind the area of a square of side 6 units. Slide the side to explore.
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MathematicsMensurationeasyFind the volume of a cube of side 4 units. Slide the side to explore.
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MathematicsMensurationeasyFind the circumference of a circle of radius 7 units (pi = 3.14159). Slide to explore.
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MathematicsComparing QuantitiesmediumFind the compound interest on 1000 at 10% per year for 2 years. Slide the values to explore.
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MathematicsComparing QuantitieseasyAn item costing 2000 is sold for 2500. Find the profit percentage. Slide the values to explore.
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MathematicsMensurationeasyFind the perimeter of a rectangle 5 units long and 3 units wide. Slide to explore.
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MathematicsMensurationeasyFind the perimeter of a square of side 6 units. Slide the side to explore.
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MathematicsMensurationeasyFind the perimeter of a triangle with sides 3, 4 and 5 units. Slide to explore.
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MathematicsMensurationeasyFind the area of a parallelogram with base 10 and height 6 units. Slide to explore.
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MathematicsMensurationmediumFind the area of a rhombus with diagonals 8 and 6 units. Slide to explore.
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MathematicsComparing QuantitieseasyA value rises from 80 to 100. Find the percentage change. Slide the values to explore.
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MathematicsUnderstanding QuadrilateralseasyFind the sum of the interior angles of a pentagon (5 sides). Slide the number of sides to explore.
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MathematicsUnderstanding QuadrilateralseasyFind each exterior angle of a regular hexagon (6 sides). Slide the number of sides to explore.
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MathematicsUnderstanding QuadrilateralsmediumHow many diagonals does a hexagon (6 sides) have? Slide the number of sides to explore.
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MathematicsComparing QuantitieseasyAn item costing 2000 is sold for 1600. Find the loss percentage. Slide the values to explore.
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MathematicsComparing QuantitieseasyFind the amount on 2000 at 5% per year for 3 years. Slide the values to explore.
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BiologyCell - Structure and FunctionseasyWhat are the main parts of a plant cell and what does each do? Tap a part to explore.
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MathematicsComparing QuantitiesmediumAt what price should a 2000 item be sold to make a 25% profit? Slide to explore.
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MathematicsMensurationeasyFind the circumference of a circle of diameter 7 units (pi = 3.14159). Slide to explore.
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MathematicsComparing QuantitieseasyWhat is 20% of 150? Slide the values to explore.
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MathematicsUnderstanding QuadrilateralsmediumFind each interior angle of a regular hexagon (6 sides). Slide the number of sides to explore.
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MathematicsComparing QuantitiesmediumA 50000 machine depreciates 10% a year. Find its value after 2 years. Slide to explore.
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MathematicsComparing QuantitiesmediumAn item sold for 2500 at a 25% profit. Find the cost price. Slide to explore.
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MathematicsDirect and Inverse ProportionseasyA boat rows at 10 km/h in still water down a 4 km/h stream. Find its downstream speed. Slide to explore.
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MathematicsDirect and Inverse ProportionseasyA boat rows at 10 km/h in still water against a 4 km/h stream. Find its upstream speed. Slide to explore.
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MathematicsDirect and Inverse ProportionshardA car goes one way at 40 km/h and back at 60 km/h. Find its average speed. Slide to explore.
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MathematicsComparing QuantitieseasyFind the tax on a 1000 item at 12%. Slide the values to explore.
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MathematicsSquares and Square RootseasyA square has an area of 144 square units. Find its side. Slide the area to explore.
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MathematicsComparing QuantitiesmediumAn interest of 300 comes from a principal of 2000 over 3 years. Find the rate. Slide to explore.
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MathematicsComparing QuantitiesmediumAn interest of 300 comes from a principal of 2000 at 5% per year. Find the time. Slide to explore.
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MathematicsComparing QuantitiesmediumAn interest of 300 is earned at 5% per year for 3 years. Find the principal. Slide to explore.
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MathematicsDirect and Inverse ProportionsmediumFind d if 2 : 3 = 4 : d. Slide a, b, c to explore.
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MathematicsComparing QuantitiesmediumAn item sold for 1500 after a 25% discount. Find the marked price. Slide to explore.
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MathematicsDirect and Inverse ProportionseasyA 200 m train passes a pole in 10 s. Find its speed. Slide to explore.
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MathematicsDirect and Inverse ProportionsmediumIf 10 workers take 12 days, how long do 15 workers take? Slide to explore.
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MathematicsComparing QuantitieseasyDivide 500 in the ratio 2 : 3. Find the first share. Slide the values to explore.
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MathematicsDirect and Inverse ProportionseasyIf 12 items cost 240, what is the cost of one? Slide the values to explore.
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PhysicsForce and PressureeasyDefine force and state its effects on the state of motion of an object.
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PhysicsForce and PressuremediumDifferentiate between balanced and unbalanced forces with an example.
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PhysicsForce and PressureeasyClassify forces into contact and non-contact forces with examples.
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PhysicsForce and PressuremediumA force of 100 N acts on an area of 2 m^2. Calculate the pressure. How does pressure change if the area is halved?
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PhysicsForce and PressuremediumState how the pressure exerted by a liquid varies, and give one application.
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PhysicsForce and PressuremediumWhat is atmospheric pressure and why do we not get crushed by it?
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PhysicsForce and PressureeasyWhat is gravitational force? Name the force you use to lift a bucket.
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PhysicsFrictioneasyWhat is friction and in which direction does it act?
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PhysicsFrictionmediumOn what two factors does the force of friction depend?
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PhysicsFrictionmediumName the three types of friction and arrange them in decreasing order.
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PhysicsFrictioneasyGive two advantages and two disadvantages of friction.
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PhysicsFrictionmediumState any three methods used to reduce friction.
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PhysicsSoundeasyHow is sound produced? Give an example.
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PhysicsSoundmediumCan sound travel through a vacuum? Justify your answer.
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PhysicsSoundmediumDefine amplitude, frequency and time period of a vibration.
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PhysicsSoundmediumOn what does the loudness and the pitch of a sound depend?
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PhysicsSoundeasyWhat is the audible range of frequency for humans? Name the sounds outside it.
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PhysicsSoundeasyWhat is noise pollution? State two of its harmful effects and one way to reduce it.
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PhysicsChemical Effects of Electric CurrentmediumDo all liquids conduct electricity? Explain with examples.
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PhysicsChemical Effects of Electric CurrentmediumWhat is electroplating? Give two of its uses.
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PhysicsSome Natural PhenomenamediumHow does an object get charged by friction, and how do two charges behave towards each other?
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PhysicsSome Natural PhenomenamediumWhat causes lightning and how does a lightning conductor protect a building?
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PhysicsLighteasyState the two laws of reflection of light.
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PhysicsLightmediumDifferentiate between regular and diffused reflection.
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PhysicsMotion and TimemediumA car travels 240 km in 4 hours. Find its average speed in km/h and in m/s.
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ChemistryPhysical and Chemical ChangeseasyDifferentiate between a physical change and a chemical change with one example each.
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ChemistryPhysical and Chemical ChangesmediumList any four characteristics that indicate a chemical change has occurred.
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