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Your 592-Day Foundation Study Plan

586 concepts, one a day, across Class 8 → 9 → 10 — subjects interleaved so ideas stick, and a final revision week to lock it in. Mark each as learned to watch your growth, keep your streak alive, and walk into your boards, NEET and JEE already ahead.

Your progress — Foundation - Class 8 to 10

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Days 1–173

Class 8

Build the basics0/173 learned▾
  1. Day 1PhysicsA sharp knife cuts better than a blunt one. Explain using the idea of pressure.
  2. Day 2ChemistryState two physical properties that distinguish metals from non-metals.
  3. Day 3BiologyGive two differences between a plant cell and an animal cell.
  4. Day 4MathsSolve the linear equation 3x + 5 = 20.
  5. Day 5PhysicsWhy is friction called a necessary evil?
  6. Day 6ChemistryWhat three conditions are necessary for combustion to take place?
  7. Day 7BiologyName two useful and two harmful micro-organisms and state what they do.
  8. Day 8MathsFind the square root of 1225 by prime factorisation.
  9. Day 9PhysicsHow is sound produced, and why can it not travel through vacuum?
  10. Day 10ChemistryWhy are coal and petroleum called fossil fuels, and why should we use them carefully?
  11. Day 11BiologyWhat is the difference between manure and fertiliser?
  12. Day 12MathsExpress 0.0000073 in standard (scientific) form.
  13. Day 13PhysicsWhat is electroplating? Give one use of it.
  14. Day 14ChemistryWhy is the disposal of plastic a serious environmental problem?
  15. Day 15BiologyWhat are secondary sexual characters, and which glands control them?
  16. Day 16MathsA shopkeeper buys a bag for 500 rupees and sells it for 575 rupees. Find the profit percent.
  17. Day 17PhysicsState the two laws of reflection of light.
  18. Day 18ChemistryWhat is the greenhouse effect and why is it a concern today?
  19. Day 19BiologyWhat is the difference between oviparous and viviparous animals? Give one example of each.
  20. Day 20MathsUse a standard identity to expand (x + 5)^2.
  21. Day 21PhysicsWhat causes lightning, and how does a lightning conductor protect a building?
  22. Day 22ChemistryWhat are the characteristics of a good fuel?
  23. Day 23BiologyWhat is biodiversity, and why should it be conserved?
  24. Day 24MathsFind the area of a trapezium whose parallel sides are 12 cm and 8 cm and whose height is 5 cm.
  25. Day 25PhysicsA car travels 60 m in 10 s. What is its speed? Slide the values to explore.
  26. Day 26ChemistryDifferentiate between a physical change and a chemical change with one example each.
  27. Day 27BiologyUnder a microscope a 6 mm object appears 60 mm long. What is the magnification? Slide to explore.
  28. Day 28MathsFind the simple interest on 2000 at 5% per year for 3 years. Slide the values to explore.
  29. Day 29PhysicsA force of 100 N acts on an area of 2 m^2. Find the pressure. Slide to explore.
  30. Day 30ChemistryList any four characteristics that indicate a chemical change has occurred.
  31. Day 31BiologyA microscope has a 10x eyepiece and a 40x objective. Find the total magnification. Slide to explore.
  32. Day 32MathsFind the area of a circle of radius 7 units (take pi = 3.14159). Slide the radius to explore.
  33. Day 33PhysicsHow far does a body going 10 m/s travel in 30 s? Slide the values to explore.
  34. Day 34ChemistryDistinguish between an element, a compound and a mixture with an example each.
  35. Day 35BiologyWhat are the main parts of a plant cell and what does each do? Tap a part to explore.
  36. Day 36MathsFind the volume of a cuboid 3 x 4 x 5 units. Slide the dimensions to explore.
  37. Day 37PhysicsDefine force and state its effects on the state of motion of an object.
  38. Day 38ChemistryWhat is the difference between a homogeneous and a heterogeneous mixture?
  39. Day 39BiologyWhy is the cell called the basic structural and functional unit of life?
  40. Day 40MathsA student scores 45 out of 180. What percentage is that? Slide the values to explore.
  41. Day 41PhysicsDifferentiate between balanced and unbalanced forces with an example.
  42. Day 42ChemistryName the three subatomic particles and state their charges and locations.
  43. Day 43BiologyState three differences between a plant cell and an animal cell.
  44. Day 44MathsFind the area of a triangle with base 10 and height 8 units. Slide to explore.
  45. Day 45PhysicsClassify forces into contact and non-contact forces with examples.
  46. Day 46ChemistryDefine atomic number and mass number. How do you find the number of neutrons?
  47. Day 47BiologyName the functions of the nucleus, mitochondria and chloroplast.
  48. Day 48MathsFind the area of a rectangle 5 units long and 4 units wide. Slide to explore.
  49. Day 49PhysicsA force of 100 N acts on an area of 2 m^2. Calculate the pressure. How does pressure change if the area is halved?
  50. Day 50ChemistryWhat is valency? State the valency of hydrogen and oxygen.
  51. Day 51BiologyDifferentiate between prokaryotic and eukaryotic cells with an example each.
  52. Day 52MathsA 2000 item has a 25% discount. How much do you save? Slide the values to explore.
  53. Day 53PhysicsState how the pressure exerted by a liquid varies, and give one application.
  54. Day 54ChemistryCompare the physical properties of metals and non-metals.
  55. Day 55BiologyWhat are microorganisms? Name the major groups.
  56. Day 56MathsFind the area of a square of side 6 units. Slide the side to explore.
  57. Day 57PhysicsWhat is atmospheric pressure and why do we not get crushed by it?
  58. Day 58ChemistryWrite what happens when a metal reacts with oxygen and with a dilute acid.
  59. Day 59BiologyGive four uses of microorganisms that are helpful to us.
  60. Day 60MathsFind the volume of a cube of side 4 units. Slide the side to explore.
  61. Day 61PhysicsWhat is gravitational force? Name the force you use to lift a bucket.
  62. Day 62ChemistryWhat is a displacement reaction? Give an example with iron and copper sulphate.
  63. Day 63BiologyWhat are pathogens? Name two diseases spread by microorganisms and how they spread.
  64. Day 64MathsFind the circumference of a circle of radius 7 units (pi = 3.14159). Slide to explore.
  65. Day 65PhysicsWhat is friction and in which direction does it act?
  66. Day 66ChemistryState two uses each of metals and non-metals based on their properties.
  67. Day 67BiologyWhat is nitrogen fixation and how is the nitrogen cycle maintained?
  68. Day 68MathsFind the compound interest on 1000 at 10% per year for 2 years. Slide the values to explore.
  69. Day 69PhysicsOn what two factors does the force of friction depend?
  70. Day 70ChemistryName four common synthetic fibres and one use of each.
  71. Day 71BiologyName any four methods of food preservation.
  72. Day 72MathsAn item costing 2000 is sold for 2500. Find the profit percentage. Slide the values to explore.
  73. Day 73PhysicsName the three types of friction and arrange them in decreasing order.
  74. Day 74ChemistryDifferentiate between thermoplastics and thermosetting plastics with examples.
  75. Day 75BiologyList the main agricultural practices in the correct order.
  76. Day 76MathsFind the perimeter of a rectangle 5 units long and 3 units wide. Slide to explore.
  77. Day 77PhysicsGive two advantages and two disadvantages of friction.
  78. Day 78ChemistryWhy are plastics harmful to the environment, and how can we manage plastic waste?
  79. Day 79BiologyDifferentiate between manure and fertiliser.
  80. Day 80MathsFind the perimeter of a square of side 6 units. Slide the side to explore.
  81. Day 81PhysicsState any three methods used to reduce friction.
  82. Day 82ChemistryWhat are exhaustible and inexhaustible natural resources? Give examples.
  83. Day 83BiologyWhat is irrigation? Name two modern methods that conserve water.
  84. Day 84MathsFind the perimeter of a triangle with sides 3, 4 and 5 units. Slide to explore.
  85. Day 85PhysicsHow is sound produced? Give an example.
  86. Day 86ChemistryName the products obtained from coal and state one use of each.
  87. Day 87BiologyWhat is fertilisation? Name the cell formed after it.
  88. Day 88MathsFind the area of a parallelogram with base 10 and height 6 units. Slide to explore.
  89. Day 89PhysicsCan sound travel through a vacuum? Justify your answer.
  90. Day 90ChemistryWhat is refining of petroleum? Name any three fractions obtained.
  91. Day 91BiologyDifferentiate between internal and external fertilisation with examples.
  92. Day 92MathsFind the area of a rhombus with diagonals 8 and 6 units. Slide to explore.
  93. Day 93PhysicsDefine amplitude, frequency and time period of a vibration.
  94. Day 94ChemistryWhat is CNG and why is it considered a cleaner fuel?
  95. Day 95BiologyDifferentiate between viviparous and oviparous animals with examples.
  96. Day 96MathsA value rises from 80 to 100. Find the percentage change. Slide the values to explore.
  97. Day 97PhysicsOn what does the loudness and the pitch of a sound depend?
  98. Day 98ChemistryState the three conditions necessary for combustion to take place.
  99. Day 99BiologyWhat is metamorphosis? Give two examples.
  100. Day 100MathsFind the sum of the interior angles of a pentagon (5 sides). Slide the number of sides to explore.
  101. Day 101PhysicsWhat is the audible range of frequency for humans? Name the sounds outside it.
  102. Day 102ChemistryName and explain the three types of combustion.
  103. Day 103BiologyExplain budding and binary fission as methods of asexual reproduction.
  104. Day 104MathsFind each exterior angle of a regular hexagon (6 sides). Slide the number of sides to explore.
  105. Day 105PhysicsWhat is noise pollution? State two of its harmful effects and one way to reduce it.
  106. Day 106ChemistryDescribe the three zones of a candle flame and state which is the hottest.
  107. Day 107BiologyWhat is adolescence? Name two changes that occur during puberty.
  108. Day 108MathsHow many diagonals does a hexagon (6 sides) have? Slide the number of sides to explore.
  109. Day 109PhysicsDo all liquids conduct electricity? Explain with examples.
  110. Day 110ChemistryDefine calorific value of a fuel and state its unit. What makes a good fuel?
  111. Day 111BiologyWhat are hormones? Name any two endocrine glands and the hormones they release.
  112. Day 112MathsAn item costing 2000 is sold for 1600. Find the loss percentage. Slide the values to explore.
  113. Day 113PhysicsWhat is electroplating? Give two of its uses.
  114. Day 114ChemistryHow does water extinguish a fire, and why is it not used on oil or electrical fires?
  115. Day 115BiologyHow is the sex of a child determined in humans?
  116. Day 116MathsFind the amount on 2000 at 5% per year for 3 years. Slide the values to explore.
  117. Day 117PhysicsHow does an object get charged by friction, and how do two charges behave towards each other?
  118. Day 118ChemistryWhat is acid rain and how is it caused?
  119. Day 119BiologyDefine biodiversity. What is meant by an endangered species?
  120. Day 120MathsAt what price should a 2000 item be sold to make a 25% profit? Slide to explore.
  121. Day 121PhysicsWhat causes lightning and how does a lightning conductor protect a building?
  122. Day 122ChemistryWhat is potable water? State two ways to make water safe for drinking.
  123. Day 123BiologyWhat is deforestation? State three of its harmful effects.
  124. Day 124MathsFind the circumference of a circle of diameter 7 units (pi = 3.14159). Slide to explore.
  125. Day 125PhysicsState the two laws of reflection of light.
  126. Day 126BiologyDifferentiate between a wildlife sanctuary and a national park. What is the Red Data Book?
  127. Day 127MathsWhat is 20% of 150? Slide the values to explore.
  128. Day 128PhysicsDifferentiate between regular and diffused reflection.
  129. Day 129BiologyName the two conducting tissues in plants and state what each transports.
  130. Day 130MathsFind each interior angle of a regular hexagon (6 sides). Slide the number of sides to explore.
  131. Day 131PhysicsA car travels 240 km in 4 hours. Find its average speed in km/h and in m/s.
  132. Day 132BiologyWhat is photosynthesis? Write its word equation and the raw materials needed.
  133. Day 133MathsA 50000 machine depreciates 10% a year. Find its value after 2 years. Slide to explore.
  134. Day 134MathsAn item sold for 2500 at a 25% profit. Find the cost price. Slide to explore.
  135. Day 135MathsA boat rows at 10 km/h in still water down a 4 km/h stream. Find its downstream speed. Slide to explore.
  136. Day 136MathsA boat rows at 10 km/h in still water against a 4 km/h stream. Find its upstream speed. Slide to explore.
  137. Day 137MathsA car goes one way at 40 km/h and back at 60 km/h. Find its average speed. Slide to explore.
  138. Day 138MathsFind the tax on a 1000 item at 12%. Slide the values to explore.
  139. Day 139MathsA square has an area of 144 square units. Find its side. Slide the area to explore.
  140. Day 140MathsAn interest of 300 comes from a principal of 2000 over 3 years. Find the rate. Slide to explore.
  141. Day 141MathsAn interest of 300 comes from a principal of 2000 at 5% per year. Find the time. Slide to explore.
  142. Day 142MathsAn interest of 300 is earned at 5% per year for 3 years. Find the principal. Slide to explore.
  143. Day 143MathsFind d if 2 : 3 = 4 : d. Slide a, b, c to explore.
  144. Day 144MathsAn item sold for 1500 after a 25% discount. Find the marked price. Slide to explore.
  145. Day 145MathsA 200 m train passes a pole in 10 s. Find its speed. Slide to explore.
  146. Day 146MathsIf 10 workers take 12 days, how long do 15 workers take? Slide to explore.
  147. Day 147MathsDivide 500 in the ratio 2 : 3. Find the first share. Slide the values to explore.
  148. Day 148MathsIf 12 items cost 240, what is the cost of one? Slide the values to explore.
  149. Day 149MathsState whether rational numbers are commutative under addition and under subtraction, with an example.
  150. Day 150MathsFind the additive inverse and the multiplicative inverse of 3/5.
  151. Day 151MathsSolve for x: 3x + 5 = 20.
  152. Day 152MathsThe sum of two consecutive natural numbers is 45. Find the numbers.
  153. Day 153MathsState two properties of perfect squares. Is 3728 a perfect square?
  154. Day 154MathsFind the square root of 324 by prime factorisation.
  155. Day 155MathsFind the cube root of 3375 by prime factorisation.
  156. Day 156MathsSimplify using laws of exponents: 2^3 x 2^4 and 5^6 / 5^2.
  157. Day 157MathsExpress 0.00000045 in standard form.
  158. Day 158MathsA student scored 45 marks out of 60. Find the percentage of marks.
  159. Day 159MathsAn article bought for 500 rupees is sold for 600 rupees. Find the profit percent.
  160. Day 160MathsThe marked price of a shirt is 800 rupees and a discount of 15% is given. Find the selling price.
  161. Day 161MathsFind the compound interest on 10000 rupees for 2 years at 10% per annum, compounded annually.
  162. Day 162MathsUse an identity to expand (x + 5)^2 and to evaluate 103^2.
  163. Day 163MathsEvaluate 98 x 102 using a suitable identity.
  164. Day 164MathsFactorise: 6xy + 9x + 4y + 6 by grouping.
  165. Day 165MathsThree angles of a quadrilateral are 90, 85 and 65 degrees. Find the fourth angle.
  166. Day 166MathsState any three properties of a parallelogram.
  167. Day 167MathsFind the sum of the interior angles of a hexagon, and each interior angle of a regular hexagon.
  168. Day 168MathsFind the area of a trapezium whose parallel sides are 12 cm and 8 cm and the distance between them is 5 cm.
  169. Day 169MathsFind the area of a rhombus whose diagonals are 16 cm and 12 cm.
  170. Day 170MathsFind the total surface area of a cuboid of length 8 cm, breadth 5 cm and height 3 cm.
  171. Day 171MathsFind the volume of a cylinder of radius 7 cm and height 10 cm. (Take pi = 22/7.)
  172. Day 172MathsIf 5 pens cost 60 rupees, what is the cost of 8 pens?
  173. Day 173MathsIf 6 workers finish a job in 12 days, how many days will 8 workers take?
Days 174–374

Class 9

Deepen the core0/201 learned▾
  1. Day 174PhysicsA car starting from rest accelerates uniformly at 2 m/s^2 for 5 seconds. Find its final velocity and the distance travelled.
  2. Day 175ChemistryWhy does evaporation cause cooling?
  3. Day 176BiologyGive two differences between a prokaryotic and a eukaryotic cell.
  4. Day 177MathsRationalise the denominator of 1 / sqrt(2).
  5. Day 178PhysicsState Newton's second law of motion and define momentum.
  6. Day 179ChemistryGive two differences between a mixture and a compound.
  7. Day 180BiologyWhat is meristematic tissue and where is it found in plants?
  8. Day 181MathsUsing the remainder theorem, find the remainder when p(x) = x^3 + 3x^2 + 3x + 1 is divided by (x + 1).
  9. Day 182PhysicsState the universal law of gravitation and write its formula.
  10. Day 183ChemistryState the law of conservation of mass with an example.
  11. Day 184BiologyWhat is the difference between mixed cropping and intercropping?
  12. Day 185MathsWhere does the line x + y = 5 meet the x-axis and the y-axis?
  13. Day 186PhysicsDefine work done by a force and state the formula for kinetic energy.
  14. Day 187ChemistryDefine the atomic number and the mass number of an atom.
  15. Day 188BiologyWhy is the atmosphere important for life on Earth?
  16. Day 189MathsFind the area of a triangle whose sides are 3 cm, 4 cm and 5 cm using Heron's formula.
  17. Day 190PhysicsWhat is an echo, and what is the minimum distance needed to hear one clearly?
  18. Day 191ChemistryWhat is the Tyndall effect, and what does it tell us about a mixture?
  19. Day 192BiologyWhat is osmosis? What happens to a cell placed in pure water?
  20. Day 193MathsFind the volume of a sphere of radius 7 cm. (Take pi = 22/7.)
  21. Day 194PhysicsState Archimedes' principle. Why does an iron nail sink but an iron ship float?
  22. Day 195ChemistryWhat are isotopes? Give one example.
  23. Day 196BiologyWhat are xylem and phloem? State the function of each.
  24. Day 197MathsFind the mean of the data: 10, 15, 20, 25, 30.
  25. Day 198PhysicsA block has a mass of 200 g and a volume of 50 cm^3. Find its density and decide if it floats in water.
  26. Day 199ChemistryHow many moles are there in 36 g of water (molar mass 18 g/mol)? Slide to explore.
  27. Day 200BiologyWhat is classification, and what is the sequence of the main groups used?
  28. Day 201MathsThe two shorter sides of a right triangle are 3 and 4. Find the hypotenuse. Slide to explore.
  29. Day 202PhysicsA force of 20 N moves a box 5 m in its direction. How much work is done? Slide to explore.
  30. Day 203ChemistryHow many molecules are there in 1 mole? And in 2 moles? Slide to explore.
  31. Day 204BiologyIf 40 out of 50 sown seeds sprout, what is the germination percentage? Slide to explore.
  32. Day 205MathsFive values add up to 250. Find their mean. Slide the values to explore.
  33. Day 206PhysicsFind the kinetic energy of a 2 kg body moving at 5 m/s, then try doubling the speed.
  34. Day 207Chemistry20 g of salt is dissolved to make 100 g of solution. Find the mass percentage. Slide to explore.
  35. Day 208BiologyGive three differences between prokaryotic and eukaryotic cells.
  36. Day 209MathsFind the surface area of a cube of side 4 units. Slide the side to explore.
  37. Day 210PhysicsWhat force gives a 10 kg body an acceleration of 5 m/s^2? Slide to explore.
  38. Day 211Chemistry20 g of solute is dissolved in 2 L of solution. Find the concentration. Slide to explore.
  39. Day 212BiologyWhat is the plasma membrane? Define diffusion.
  40. Day 213MathsFind the volume of a cone of radius 3 and height 7 units (pi = 3.14159). Slide to explore.
  41. Day 214PhysicsFind the momentum of a 10 kg body moving at 5 m/s. Slide the values to explore.
  42. Day 215ChemistryHow do you write the electronic configuration and find the valency of an element? Slide the atomic number from H to Ca to explore.
  43. Day 216BiologyDefine osmosis. What happens to a cell placed in a hypotonic and in a hypertonic solution?
  44. Day 217MathsFind the total surface area of a cylinder of radius 3 and height 7 units (pi = 3.14159). Slide to explore.
  45. Day 218PhysicsFind the weight of a 10 kg body on Earth (g = 9.8 m/s^2), then try the Moon. Slide g to explore.
  46. Day 219ChemistryAn atom has 6 protons and 6 neutrons. Find its mass number. Slide to explore.
  47. Day 220BiologyWhat is the cell wall made of? Define plasmolysis.
  48. Day 221MathsFind the surface area of a cuboid 3 x 4 x 5 units. Slide the dimensions to explore.
  49. Day 222Physics200 J of work is done in 10 s. Find the power. Slide the values to explore.
  50. Day 223ChemistryHow do you draw the electron dot structure of an element? Slide the atomic number to explore.
  51. Day 224BiologyState the functions of the nucleus.
  52. Day 225MathsFind the volume of a hemisphere of radius 6 units (pi = 3.14159). Slide to explore.
  53. Day 226PhysicsFind the potential energy of a 2 kg body raised 10 m (g = 9.8 m/s^2). Slide to explore.
  54. Day 227ChemistryConvert 25 C to the Kelvin scale. Slide the temperature to explore.
  55. Day 228BiologyWhy are mitochondria called the powerhouse of the cell?
  56. Day 229MathsA cone has radius 3 and height 4 units. Find its slant height. Slide to explore.
  57. Day 230PhysicsA wave has a frequency of 500 Hz and a wavelength of 0.5 m. Find its speed. Slide to explore.
  58. Day 231ChemistryHow many moles are 6.022 x 10^23 particles? And 1.2 x 10^24? Slide to explore.
  59. Day 232BiologyWhat are the functions of the rough and smooth endoplasmic reticulum?
  60. Day 233MathsFind the curved surface area of a cone with radius 3 and slant height 5 units (pi = 3.14159). Slide to explore.
  61. Day 234PhysicsA body speeds up from 0 to 20 m/s in 5 s. Find its acceleration. Slide the values to explore.
  62. Day 235ChemistryWhat is the mass of 2 moles of water (molar mass 18 g/mol)? Slide to explore.
  63. Day 236BiologyState the functions of the Golgi apparatus and lysosomes.
  64. Day 237MathsFind the total surface area of a cone with radius 3 and slant height 5 units (pi = 3.14159). Slide to explore.
  65. Day 238PhysicsA vibration has a time period of 0.5 s. Find its frequency. Slide the period to explore.
  66. Day 239ChemistryConvert 300 K to the Celsius scale. Slide the temperature to explore.
  67. Day 240BiologyWhat are plastids? State the function of the vacuole.
  68. Day 241MathsFind the curved surface area of a hemisphere of radius 6 units (pi = 3.14159). Slide to explore.
  69. Day 242PhysicsAn echo returns in 2 s where sound travels at 340 m/s. How far is the surface? Slide to explore.
  70. Day 243ChemistryChlorine is 75% mass-35 and 25% mass-37. Find its average atomic mass. Slide to explore.
  71. Day 244BiologyWhat is meristematic tissue? Name its three types by location.
  72. Day 245MathsFind the diagonal of a square of side 10 units. Slide the side to explore.
  73. Day 246PhysicsA vibration has a frequency of 2 Hz. Find its time period. Slide the frequency to explore.
  74. Day 247ChemistryA 100 g sample contains 90 g of pure substance. Find its percentage purity. Slide to explore.
  75. Day 248BiologyName the three simple permanent tissues in plants and give one function of each.
  76. Day 249MathsFind the diagonal of a rectangle 3 by 4 units. Slide the sides to explore.
  77. Day 250PhysicsTwo cars approach each other at 20 m/s and 10 m/s. How fast do they close in? Slide to explore.
  78. Day 251ChemistryAn atom has mass number 12 and atomic number 6. How many neutrons does it have? Slide to explore.
  79. Day 252BiologyName the two complex permanent tissues and state their functions.
  80. Day 253MathsFind the longest diagonal of a cuboid 3 x 4 x 12 units. Slide the dimensions to explore.
  81. Day 254PhysicsA body speeds up from 10 m/s to 30 m/s uniformly. Find its average velocity. Slide to explore.
  82. Day 255ChemistryHow do you write the formula of calcium chloride? Pick the ions to criss-cross their valencies.
  83. Day 256BiologyWhat is epithelial tissue? Name any two types.
  84. Day 257MathsFind the area of a triangle with sides 3, 4 and 5 units using Heron's formula. Slide to explore.
  85. Day 258PhysicsA body starts at 5 m/s and accelerates at 2 m/s^2 for 5 s. Find its final velocity. Slide to explore.
  86. Day 259ChemistryHow do the particles change as a solid is heated into a liquid and then a gas? Slide the heat to explore.
  87. Day 260BiologyWhat is connective tissue? Give three examples.
  88. Day 261MathsFind the area of an equilateral triangle of side 6 units. Slide the side to explore.
  89. Day 262PhysicsA body starts at 10 m/s and accelerates at 2 m/s^2 for 5 s. How far does it go? Slide to explore.
  90. Day 263ChemistryCan you match each element to its correct symbol? Tap the right symbol to score.
  91. Day 264BiologyName the three types of muscular tissue and describe nervous tissue briefly.
  92. Day 265MathsFind the curved surface area of a cylinder with radius 3 and height 7 units (pi = 3.14159). Slide to explore.
  93. Day 266PhysicsConvert 72 km/h into metres per second. Slide the speed to explore.
  94. Day 267ChemistryCompare the three states of matter in terms of shape, volume and compressibility.
  95. Day 268BiologyWhat is classification? Write the hierarchy of classification in order.
  96. Day 269MathsFind the longest diagonal of a cube of side 5 units. Slide the side to explore.
  97. Day 270PhysicsA body starts at 10 m/s and accelerates at 2 m/s^2 over 100 m. Find its final velocity. Slide to explore.
  98. Day 271ChemistryState the main characteristics of the particles of matter.
  99. Day 272BiologyName the five kingdoms proposed by Whittaker with one example each.
  100. Day 273MathsFind the total surface area of a solid hemisphere of radius 6 units (pi = 3.14159). Slide to explore.
  101. Day 274PhysicsA force of 20 N acts for 2 s. Find the impulse. Slide the values to explore.
  102. Day 275ChemistryWhat is latent heat of fusion? Why does the temperature stay constant during melting?
  103. Day 276BiologyDifferentiate between invertebrates and vertebrates. Name the classes of vertebrates.
  104. Day 277MathsA data set has a highest value of 80 and a lowest of 20. Find the range. Slide to explore.
  105. Day 278PhysicsA sound wave travels at 340 m/s with a frequency of 200 Hz. Find its wavelength. Slide to explore.
  106. Day 279ChemistryWhat is evaporation? State the factors that affect its rate.
  107. Day 280BiologyWhat is binomial nomenclature? State its conventions.
  108. Day 281MathsFind the class mark of the interval 10 to 20. Slide the limits to explore.
  109. Day 282PhysicsHow many oscillations does a 50 Hz vibration make in 10 s? Slide to explore.
  110. Day 283ChemistryHow do temperature and pressure affect the state of matter?
  111. Day 284BiologyDescribe the water cycle.
  112. Day 285MathsTwo interior angles of a triangle are 60 and 70 degrees. Find the exterior angle at the third vertex. Slide to explore.
  113. Day 286PhysicsConvert 20 m/s into kilometres per hour. Slide the speed to explore.
  114. Day 287ChemistryDifferentiate between a pure substance and a mixture.
  115. Day 288BiologyExplain the main steps of the nitrogen cycle.
  116. Day 289MathsWhat is the supplement of a 60 degree angle? Slide the angle to explore.
  117. Day 290PhysicsA body goes from 10 m/s to 30 m/s at 2 m/s^2. Find the distance covered. Slide to explore.
  118. Day 291ChemistryGive one difference between homogeneous and heterogeneous mixtures with examples.
  119. Day 292BiologyDescribe the carbon cycle and the greenhouse effect.
  120. Day 293MathsA cube has a volume of 64 cubic units. Find its edge. Slide the volume to explore.
  121. Day 294PhysicsA force of 20 N moves an object at 5 m/s. Find the power. Slide to explore.
  122. Day 295ChemistryDifferentiate between a true solution, a colloid and a suspension.
  123. Day 296BiologyWhat is the importance of the ozone layer? What damages it?
  124. Day 297MathsA triangle has an area of 40 square units and a base of 10. Find its height. Slide to explore.
  125. Day 298PhysicsHow fast is a body moving after falling 20 m (g = 9.8 m/s^2)? Slide the height to explore.
  126. Day 299ChemistryA solution contains 20 g of salt in 80 g of water. Find the mass percentage of the solute.
  127. Day 300BiologyName the three broad ways of improving crop yields.
  128. Day 301MathsFor the line y = 2x + 1, find y when x = 3. Slide m, x and c to explore.
  129. Day 302PhysicsHow long does a body take to fall 20 m (g = 9.8 m/s^2)? Slide the height to explore.
  130. Day 303ChemistryName the technique used to separate: (a) salt from sea water, (b) two miscible liquids, (c) cream from milk.
  131. Day 304BiologyWhat is animal husbandry? Give examples of its branches.
  132. Day 305MathsDifferentiate between rational and irrational numbers with an example each.
  133. Day 306PhysicsHow far does a dropped body fall in 3 s (g = 9.8 m/s^2)? Slide the time to explore.
  134. Day 307ChemistryHow is a compound different from a mixture?
  135. Day 308MathsRationalise the denominator of 1 / sqrt(3).
  136. Day 309PhysicsHow do you balance a see-saw with different weights? Slide the weights and distances to explore.
  137. Day 310ChemistryState the law of conservation of mass with an example.
  138. Day 311MathsSimplify 2^(1/2) x 2^(1/2) and (8)^(2/3).
  139. Day 312PhysicsFind the upthrust on an object that displaces 10 L of water (density 1000 kg/m^3, g = 9.8). Slide to explore.
  140. Day 313ChemistryState the law of constant proportions with an example.
  141. Day 314MathsDefine the degree of a polynomial. Name the polynomials of degree 1, 2 and 3.
  142. Day 315PhysicsFind the relative density of aluminium (density 2700 kg/m^3). Slide the density to explore.
  143. Day 316ChemistryDefine a molecule and atomicity. What is the atomicity of oxygen and ozone?
  144. Day 317MathsFind the remainder when p(x) = x^3 + 3x^2 + 3x + 1 is divided by (x + 1).
  145. Day 318PhysicsFind the power to lift 50 kg through 10 m in 10 s (g = 9.8). Slide to explore.
  146. Day 319ChemistryWhat is an ion? Differentiate between a cation and an anion.
  147. Day 320MathsState the factor theorem. Is (x - 2) a factor of p(x) = x^2 - 5x + 6?
  148. Day 321PhysicsDifferentiate between distance and displacement.
  149. Day 322ChemistryWrite the chemical formula of aluminium oxide using the criss-cross method.
  150. Day 323MathsExpand (x + 2y + 3z)^2 using a standard identity.
  151. Day 324PhysicsDefine speed and velocity. State their SI unit.
  152. Day 325ChemistryHow many molecules are present in 2 moles of water? What is their mass? (Molar mass of water = 18 g/mol.)
  153. Day 326MathsIn which quadrant do the points (3, -4) and (-2, 5) lie?
  154. Day 327PhysicsA car's velocity increases from 10 m/s to 30 m/s in 5 s. Find its acceleration.
  155. Day 328ChemistryCalculate the molecular mass of sulphuric acid, H2SO4. (H = 1, S = 32, O = 16.)
  156. Day 329MathsHow many solutions does a linear equation in two variables have? Find two solutions of x + y = 5.
  157. Day 330PhysicsWrite the three equations of motion and state what each symbol means.
  158. Day 331ChemistryName the three subatomic particles with their charge, mass and discoverer.
  159. Day 332MathsDefine a linear pair and vertically opposite angles.
  160. Day 333PhysicsA body starting from rest accelerates at 2 m/s^2 for 5 s. Find the distance covered.
  161. Day 334ChemistryDescribe Rutherford's model of the atom and how it improved on Thomson's model.
  162. Day 335MathsState the angle relationships when a transversal cuts two parallel lines.
  163. Day 336PhysicsWhy is uniform circular motion called accelerated motion?
  164. Day 337ChemistryState the main postulates of Bohr's model of the atom.
  165. Day 338MathsTwo interior angles of a triangle are 50 and 60 degrees. Find the third angle and the exterior angle at the third vertex.
  166. Day 339PhysicsWhat do the slope and the area under a velocity-time graph represent?
  167. Day 340ChemistryAn atom has 17 protons and 18 neutrons. Find its atomic number and mass number.
  168. Day 341MathsState the criteria for the congruence of two triangles.
  169. Day 342PhysicsState Newton's first law of motion and define inertia.
  170. Day 343ChemistryDifferentiate between isotopes and isobars with an example each.
  171. Day 344MathsState the two key properties of an isosceles triangle.
  172. Day 345PhysicsName the three types of inertia with one example each.
  173. Day 346ChemistryWrite the electronic configuration of magnesium (atomic number 12) and state its valency.
  174. Day 347MathsState any three properties of a parallelogram.
  175. Day 348PhysicsState Newton's second law. What force gives a 5 kg body an acceleration of 2 m/s^2?
  176. Day 349ChemistryHow is valency determined from the electronic configuration? Find the valency of chlorine (2, 8, 7).
  177. Day 350MathsState the midpoint theorem. If the third side of a triangle is 10 cm, how long is the segment joining the midpoints of the other two sides?
  178. Day 351PhysicsDefine momentum and find the momentum of a 2 kg ball moving at 5 m/s.
  179. Day 352MathsState two properties relating the centre of a circle to its chords.
  180. Day 353PhysicsState Newton's third law of motion and give one example.
  181. Day 354MathsState the angle-at-centre theorem and the property of a cyclic quadrilateral.
  182. Day 355PhysicsA gun of mass 4 kg fires a bullet of mass 0.02 kg at 200 m/s. Find the recoil velocity of the gun.
  183. Day 356MathsFind the area of a triangle whose sides are 3 cm, 4 cm and 5 cm using Heron's formula.
  184. Day 357PhysicsState Newton's universal law of gravitation and write its formula.
  185. Day 358MathsFind the volume of a cone of radius 3 cm and height 7 cm. (Take pi = 22/7.)
  186. Day 359PhysicsDifferentiate between mass and weight. Why is weight on the Moon less than on Earth?
  187. Day 360MathsFind the surface area of a sphere of radius 7 cm. (Take pi = 22/7.)
  188. Day 361PhysicsA stone is dropped from rest from a height. Find its velocity after 3 s. (Take g = 9.8 m/s^2.)
  189. Day 362MathsFind the total surface area of a closed cylinder of radius 7 cm and height 10 cm. (Take pi = 22/7.)
  190. Day 363PhysicsDefine thrust and pressure. State the SI unit of pressure.
  191. Day 364MathsFind the mean of the data: 10, 12, 14, 16, 18.
  192. Day 365PhysicsState Archimedes' principle and define buoyancy.
  193. Day 366MathsFind the median and mode of the data: 4, 6, 6, 8, 10.
  194. Day 367PhysicsThe density of a substance is 800 kg/m^3. Find its relative density and state if it floats on water.
  195. Day 368MathsA coin is tossed 100 times and a head appears 60 times. Find the empirical probability of getting a head.
  196. Day 369PhysicsA force of 20 N moves a body 5 m in the direction of the force. Find the work done.
  197. Day 370PhysicsFind the kinetic energy of a 2 kg body moving at 10 m/s.
  198. Day 371PhysicsFind the potential energy of a 5 kg body raised to a height of 4 m. (Take g = 10 m/s^2.)
  199. Day 372PhysicsState the law of conservation of energy and illustrate it with a freely falling body.
  200. Day 373PhysicsDefine power. A machine does 6000 J of work in 20 s. Find its power.
  201. Day 374PhysicsA person hears an echo 2 s after shouting towards a cliff. If the speed of sound is 340 m/s, how far is the cliff?
Days 375–586

Class 10

Master board-level concepts0/212 learned▾
  1. Day 375PhysicsWhy does a ray of light bend when it passes from air into glass?
  2. Day 376ChemistryWhen an iron nail is dipped in copper sulphate solution, the blue colour fades. Write the reaction and name its type.
  3. Day 377BiologyHow is oxygen transported from the lungs to the tissues in human beings?
  4. Day 378MathsFind the HCF of 96 and 404 using Euclid's division algorithm.
  5. Day 379PhysicsState the mirror formula and the sign convention used for a concave mirror.
  6. Day 380ChemistryWhat is the pH scale, and how does pH change as a solution becomes more acidic?
  7. Day 381BiologyGive two differences between arteries and veins.
  8. Day 382MathsFind the zeroes of the polynomial x^2 - 7x + 10 and verify the relationship between the zeroes and the coefficients.
  9. Day 383PhysicsState Ohm's law and define electrical resistance.
  10. Day 384ChemistryZinc can displace copper from copper sulphate, but copper cannot displace zinc from zinc sulphate. Explain.
  11. Day 385BiologyWhat is a reflex arc? Trace the path of a reflex action when you touch a hot object.
  12. Day 386MathsSolve the pair of equations: 2x + 3y = 13 and x - y = -1.
  13. Day 387PhysicsA current of 2 A flows through a 5 ohm resistor. Find the potential difference across it and the power dissipated.
  14. Day 388ChemistryWhy does carbon form a very large number of compounds?
  15. Day 389BiologyWhy does sexual reproduction produce more variation than asexual reproduction?
  16. Day 390MathsFind the roots of x^2 - 5x + 6 = 0 and state the nature of the roots using the discriminant.
  17. Day 391PhysicsState the right-hand thumb rule for the magnetic field around a straight current-carrying wire.
  18. Day 392ChemistryIn the reaction CuO + H2 -> Cu + H2O, identify the substance oxidised and the substance reduced.
  19. Day 393BiologyIn 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.
  20. Day 394MathsThe first term of an AP is 3 and the common difference is 5. Find its 10th term.
  21. Day 395PhysicsA convex lens has a focal length of 25 cm. Find its power.
  22. Day 396ChemistryWhat is a neutralisation reaction? Give the general equation and one everyday use.
  23. Day 397BiologyWhat is photosynthesis? Write its balanced equation and the conditions needed.
  24. Day 398MathsFind the sum of the first 20 terms of the AP 2, 5, 8, 11, ...
  25. Day 399PhysicsWhy does the clear sky appear blue?
  26. Day 400ChemistryWhat is a homologous series? State two of its characteristics.
  27. Day 401BiologyWhat is a food chain? State the ten percent law of energy transfer.
  28. Day 402MathsState the Basic Proportionality Theorem (Thales' theorem).
  29. Day 403PhysicsHow is the total resistance calculated for resistors joined in series and in parallel?
  30. Day 404ChemistryName the four main types of chemical reactions and give one example of each.
  31. Day 405BiologyWhat is a reflex action? Trace the pathway of a reflex arc.
  32. Day 406MathsFind the distance between the points (2, 3) and (5, 7).
  33. Day 407PhysicsWhy does the clear sky appear blue?
  34. Day 408ChemistryWhat is the reactivity series of metals, and why is it useful?
  35. Day 409BiologyIn a cross between two Tt pea plants, what offspring ratio is expected, and why?
  36. Day 410MathsIf sin(theta) = 3/5, find cos(theta) and tan(theta), where theta is acute.
  37. Day 411PhysicsWhat is electromagnetic induction, and how can the induced current be increased?
  38. Day 412ChemistryWhy does carbon form a very large number of compounds?
  39. Day 413BiologyGive three differences between arteries and veins.
  40. Day 414MathsThe 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.
  41. Day 415PhysicsA convex lens has a focal length of 0.5 m. Find its power. Slide the focal length to explore.
  42. Day 416ChemistryHow are alkanes named as the carbon chain grows? Slide the number of carbon atoms to explore.
  43. Day 417BiologyIf 500 deer live in a 25 km^2 forest, what is the population density? Slide to explore.
  44. Day 418MathsA 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.
  45. Day 419PhysicsLight 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.
  46. Day 420ChemistryHow do you balance H2 + O2 -> H2O? Slide the coefficients until both sides match.
  47. Day 421BiologyA population of 500 has 60 births and 40 deaths in a year. Find the new population. Slide to explore.
  48. Day 422MathsFind the volume of a cone whose base radius is 3 cm and height is 4 cm. (Take pi = 22/7.)
  49. Day 423PhysicsTwo resistors of 10 ohm and 20 ohm are connected in series. Find the total resistance. Slide to explore.
  50. Day 424ChemistryDifferentiate between combination and decomposition reactions with one example each.
  51. Day 425BiologyAt 72 beats per minute, how many times does the heart beat in 10 minutes? Slide to explore.
  52. Day 426MathsThe mean of a distribution is 27 and its median is 30. Estimate the mode using the empirical relationship.
  53. Day 427Physics30 C of charge flows past a point in 60 s. Find the current. Slide to explore.
  54. Day 428ChemistryDifferentiate between displacement and double displacement reactions with examples.
  55. Day 429BiologyIf a level has 1000 units of energy, how much reaches the next level? Slide to explore.
  56. Day 430MathsOne card is drawn at random from a well-shuffled deck of 52 playing cards. What is the probability that it is a king?
  57. Day 431PhysicsA current of 2 A flows through a 5 ohm resistor. Find the power dissipated. Slide to explore.
  58. Day 432ChemistryDefine oxidation and reduction. Identify them in: CuO + H2 -> Cu + H2O.
  59. Day 433BiologyAt 16 breaths per minute, how many breaths are taken in 10 minutes? Slide to explore.
  60. Day 434MathsEvaluate 2 tan^2(45 degrees) + cos^2(30 degrees) - sin^2(60 degrees).
  61. Day 435PhysicsTwo resistors of 10 ohm and 20 ohm are connected in parallel. Find the total resistance. Slide to explore.
  62. Day 436ChemistryWhat is corrosion and rancidity? State one method to prevent each.
  63. Day 437BiologyA population of 500 has 60 births and 40 deaths in a year. Find the growth rate. Slide to explore.
  64. Day 438MathsWhat is the probability of rolling a 4 on a fair die? Change the outcomes to explore.
  65. Day 439PhysicsA current of 2 A flows for 30 s. How much charge passes? Slide to explore.
  66. Day 440ChemistryState two properties each of acids and bases.
  67. Day 441BiologyWhat offspring do you get when you cross two tall pea plants that are both Tt? Pick the parents to explore.
  68. Day 442MathsFind the volume of a cylinder of radius 3 and height 7 units (pi = 3.14159). Slide to explore.
  69. Day 443PhysicsA 1000 W heater runs for 5 hours. How many units (kWh) does it use? Slide to explore.
  70. Day 444ChemistryWhat is the pH scale? State the importance of pH in everyday life.
  71. Day 445BiologyWhat is the pathway of a reflex action when you touch a hot object? Step through it to explore.
  72. Day 446MathsFind the surface area of a sphere of radius 7 units (pi = 3.14159). Slide to explore.
  73. Day 447Physics60 J of work moves 5 C of charge between two points. Find the potential difference. Slide to explore.
  74. Day 448ChemistryWhat is a neutralisation reaction? Give an example.
  75. Day 449BiologyWhat are the four chambers of the heart and what does each do? Tap a chamber to explore.
  76. Day 450MathsFind the 5th term of the AP starting at 2 with common difference 3. Slide to explore.
  77. Day 451PhysicsA voltage of 12 V drives a current of 2 A. Find the resistance. Slide to explore.
  78. Day 452ChemistryName the products obtained by the electrolysis of brine and one use of bleaching powder.
  79. Day 453BiologyWhat is photosynthesis? Write its balanced equation and the site where it occurs.
  80. Day 454MathsFind the sum of the first 5 terms of the AP starting at 2 with common difference 3. Slide to explore.
  81. Day 455PhysicsFind the heat produced by a 2 A current in a 5 ohm resistor for 10 s. Slide to explore.
  82. Day 456ChemistryGive the chemical name, formula and one use each of baking soda and washing soda.
  83. Day 457BiologyBriefly describe digestion of food in humans.
  84. Day 458MathsA line rises 6 units over a run of 3 units. Find its slope. Slide to explore.
  85. Day 459PhysicsA device runs at 12 V and draws 2 A. Find its power. Slide to explore.
  86. Day 460ChemistryWhat is water of crystallisation? How is Plaster of Paris prepared and used?
  87. Day 461BiologyDifferentiate between aerobic and anaerobic respiration with their end products.
  88. Day 462MathsFind the area of a 90 degree sector of a circle of radius 7 units (pi = 3.14159). Slide to explore.
  89. Day 463PhysicsA spherical mirror has a radius of curvature of 40 cm. Find its focal length. Slide to explore.
  90. Day 464ChemistryCompare the physical properties of metals and non-metals, with exceptions.
  91. Day 465BiologyDescribe the path of air in the human respiratory system and where gas exchange occurs.
  92. Day 466MathsFind the length of a 90 degree arc of a circle of radius 7 units (pi = 3.14159). Slide to explore.
  93. Day 467PhysicsHow fast does light travel in glass (n = 1.5), given c = 3 x 10^8 m/s? Slide to explore.
  94. Day 468ChemistryWhat is the reactivity series? How does it help predict a displacement reaction?
  95. Day 469BiologyWhat is double circulation? Why is it necessary in humans?
  96. Day 470MathsFind the discriminant of x^2 + 5x + 6 = 0. Slide a, b and c to explore.
  97. Day 471PhysicsA home uses 100 units at 6 rupees per unit. Find the bill. Slide the values to explore.
  98. Day 472ChemistryState four properties of ionic compounds.
  99. Day 473BiologyHow are water and food transported in plants?
  100. Day 474MathsFind the sum of the roots of x^2 - 5x + 6 = 0. Slide a and b to explore.
  101. Day 475PhysicsA 1100 W appliance runs on 220 V. What current does it draw? Slide to explore.
  102. Day 476ChemistryHow does the method of extracting a metal depend on its reactivity?
  103. Day 477BiologyWhat is the functional unit of the kidney? Briefly describe how urine is formed.
  104. Day 478MathsIn a right triangle the opposite side is 3 and the hypotenuse is 5. Find sin of the angle. Slide to explore.
  105. Day 479PhysicsFind the power of a 484 ohm element on 220 V. Slide to explore.
  106. Day 480ChemistryWhat conditions are necessary for rusting of iron? State two methods to prevent it.
  107. Day 481BiologyWhat is a reflex action? Trace the path of a reflex arc.
  108. Day 482MathsIn a right triangle the adjacent side is 4 and the hypotenuse is 5. Find cos of the angle. Slide to explore.
  109. Day 483PhysicsWhat happens to the other bulb when one bulb fails, in series versus parallel? Flip the wiring and break a bulb to explore.
  110. Day 484ChemistryWhy does carbon form a very large number of compounds?
  111. Day 485BiologyDraw the parts of a neuron and explain how an impulse travels across a synapse.
  112. Day 486MathsIn a right triangle the opposite side is 3 and the adjacent side is 4. Find tan of the angle. Slide to explore.
  113. Day 487PhysicsList the characteristics of an image formed by a plane mirror.
  114. Day 488ChemistryDifferentiate between saturated and unsaturated hydrocarbons with examples.
  115. Day 489BiologyName the three main parts of the human brain and give one function of each.
  116. Day 490MathsFind the distance between (0, 0) and (3, 4). Slide the coordinates to explore.
  117. Day 491PhysicsState one use each of a concave and a convex mirror, with a reason.
  118. Day 492ChemistryWhat is a homologous series? State two of its characteristics.
  119. Day 493BiologyName any four hormones in humans, the glands that secrete them and their functions.
  120. Day 494MathsFind the sum 1 + 2 + 3 + ... + 10. Slide n to explore.
  121. Day 495PhysicsAn object is placed 30 cm from a concave mirror of focal length 20 cm. Find the image distance.
  122. Day 496ChemistryGive the functional group and one property each of ethanol and ethanoic acid.
  123. Day 497BiologyWhat are tropisms? Name the plant hormone responsible for phototropism.
  124. Day 498MathsFind the perimeter of a 90 degree sector of radius 7 units (pi = 3.14159). Slide to explore.
  125. Day 499PhysicsDefine refractive index. What does a refractive index of 1.5 for glass mean?
  126. Day 500ChemistryWhat is a micelle? How do soaps remove oily dirt?
  127. Day 501BiologyName and explain any three methods of asexual reproduction.
  128. Day 502MathsWhat is the probability of NOT rolling a 4 on a die? Change the outcomes to explore.
  129. Day 503PhysicsDifferentiate between a convex and a concave lens and give one use of each.
  130. Day 504ChemistryState Mendeleev's periodic law and two achievements of his table.
  131. Day 505BiologyDifferentiate between pollination and fertilisation in flowering plants.
  132. Day 506MathsFind the product of the roots of x^2 - 5x + 6 = 0. Slide a and c to explore.
  133. Day 507PhysicsAn object is placed 15 cm from a convex lens of focal length 10 cm. Find the image distance.
  134. Day 508ChemistryState the modern periodic law and describe the arrangement of the modern periodic table.
  135. Day 509BiologyName the main organs of the male and female reproductive systems and their functions.
  136. Day 510MathsWhat is the complement of a 30 degree angle? Slide the angle to explore.
  137. Day 511PhysicsFind the power of a convex lens of focal length 25 cm.
  138. Day 512ChemistryHow do atomic size and metallic character vary across a period from left to right?
  139. Day 513BiologyWhat is the menstrual cycle? Why does menstruation occur?
  140. Day 514MathsFind the perimeter of a semicircle of radius 7 units (pi = 3.14159). Slide to explore.
  141. Day 515PhysicsName the main parts of the human eye and their functions.
  142. Day 516ChemistryHow do atomic size and metallic character change on going down a group?
  143. Day 517BiologyState Mendel's law of dominance and law of segregation.
  144. Day 518MathsFind the area of a semicircle of radius 7 units (pi = 3.14159). Slide to explore.
  145. Day 519PhysicsWhat is the power of accommodation of the eye?
  146. Day 520ChemistryBalance the equation: Fe + H2O -> Fe3O4 + H2.
  147. Day 521BiologyIn a cross between two tall pea plants (Tt x Tt), what is the phenotypic ratio of the offspring?
  148. Day 522MathsIn a right triangle the hypotenuse is 5 and the opposite side is 3. Find cosec of the angle. Slide to explore.
  149. Day 523PhysicsWhat is myopia? State its cause and correction.
  150. Day 524BiologyHow is the sex of a child determined in human beings?
  151. Day 525MathsIn a right triangle the hypotenuse is 5 and the adjacent side is 4. Find sec of the angle. Slide to explore.
  152. Day 526PhysicsWhat is hypermetropia and how is it corrected? What is presbyopia?
  153. Day 527BiologyDifferentiate between homologous and analogous organs with examples.
  154. Day 528MathsIn a right triangle the adjacent side is 4 and the opposite side is 3. Find cot of the angle. Slide to explore.
  155. Day 529PhysicsWhat is dispersion of light? Why does it occur?
  156. Day 530BiologyWhat is a food chain? Name the trophic levels with an example.
  157. Day 531MathsFrom 50 m away, the top of a tower has an angle of elevation of 30 degrees. Find its height. Slide to explore.
  158. Day 532PhysicsWhy is the sky blue and the Sun reddish at sunrise and sunset?
  159. Day 533BiologyState the ten percent law. Why are food chains usually short?
  160. Day 534MathsFind the area of a quadrant of radius 7 units (pi = 3.14159). Slide to explore.
  161. Day 535PhysicsDefine electric current and potential difference, and state their SI units.
  162. Day 536BiologyWhat is the role of decomposers? Why is the ozone layer important?
  163. Day 537MathsFind 1 + 3 + 5 + 7 + 9. Slide how many odd numbers to explore.
  164. Day 538PhysicsState Ohm's law. A 12 V battery drives a current of 3 A through a resistor. Find its resistance.
  165. Day 539BiologyWhat are the three R's of managing natural resources? What is sustainable development?
  166. Day 540MathsFind 2 + 4 + 6 + 8 + 10. Slide how many even numbers to explore.
  167. Day 541PhysicsOn what factors does the resistance of a conductor depend?
  168. Day 542BiologyHow can forests and water be conserved? Mention the Chipko movement.
  169. Day 543MathsFind a root of x^2 - 5x + 6 = 0 using the quadratic formula. Slide a, b, c to explore.
  170. Day 544PhysicsThree resistors of 2 ohm, 3 ohm and 5 ohm are connected in series. Find the total resistance.
  171. Day 545MathsThe HCF of 12 and 18 is 6. Find their LCM. Slide the values to explore.
  172. Day 546PhysicsTwo resistors of 6 ohm and 3 ohm are connected in parallel. Find the equivalent resistance.
  173. Day 547MathsFind the area of a ring with outer radius 10 and inner radius 6 units (pi = 3.14159). Slide to explore.
  174. Day 548PhysicsState Joule's law of heating. Find the heat produced in a 10 ohm resistor carrying 2 A for 30 s.
  175. Day 549MathsA circle has an area of 154 square units. Find its radius (pi = 3.14159). Slide to explore.
  176. Day 550PhysicsAn electric bulb is rated 60 W, 240 V. Find the current it draws and its resistance.
  177. Day 551MathsFind the mean proportional between 4 and 9. Slide the values to explore.
  178. Day 552PhysicsWhat is a magnetic field? State two properties of magnetic field lines.
  179. Day 553MathsFind the average term of the AP from 2 to 14. Slide the first and last terms to explore.
  180. Day 554PhysicsState the right-hand thumb rule for the magnetic field due to a straight current-carrying conductor.
  181. Day 555MathsHow many terms are in the AP 2, 5, 8, 11, 14? Slide the values to explore.
  182. Day 556PhysicsState Fleming's left-hand rule and name one device based on it.
  183. Day 557MathsFind the x-coordinate of the midpoint of x = 2 and x = 8. Slide the values to explore.
  184. Day 558PhysicsWhat is electromagnetic induction? State Fleming's right-hand rule.
  185. Day 559MathsA data set has a median of 40 and a mean of 38. Estimate the mode. Slide the values to explore.
  186. Day 560PhysicsWhat is the function of a fuse and of the earth wire in a domestic circuit?
  187. Day 561MathsA 50 m tower casts a shadow when the sun is at 45 degrees. Find the shadow length. Slide to explore.
  188. Day 562MathsThe HCF of two numbers is 6 and their product is 216. Find their LCM.
  189. Day 563MathsState the fundamental theorem of arithmetic and use it to find the HCF and LCM of 12 and 18.
  190. Day 564MathsHow is sqrt(2) proved to be irrational (outline)?
  191. Day 565MathsFind the sum and product of the zeroes of the polynomial x^2 - 5x + 6.
  192. Day 566MathsSolve by substitution: x + y = 10 and x - y = 4.
  193. Day 567MathsState the conditions for a pair of linear equations to have a unique solution, no solution and infinitely many solutions.
  194. Day 568MathsSolve the quadratic equation x^2 - 5x + 6 = 0 by factorisation.
  195. Day 569MathsSolve x^2 - 4x + 1 = 0 using the quadratic formula.
  196. Day 570MathsWhat is the discriminant? Find the nature of the roots of x^2 + 4x + 4 = 0.
  197. Day 571MathsFind the 15th term of the AP: 3, 7, 11, 15, ...
  198. Day 572MathsFind the sum of the first 20 terms of the AP: 2, 5, 8, 11, ...
  199. Day 573MathsState the criteria for the similarity of two triangles.
  200. Day 574MathsState the basic proportionality theorem (Thales theorem).
  201. Day 575MathsThe two shorter sides of a right triangle are 6 cm and 8 cm. Find the hypotenuse.
  202. Day 576MathsFind the distance between the points (1, 2) and (4, 6).
  203. Day 577MathsFind the coordinates of the point dividing the line joining (2, 3) and (6, 7) in the ratio 1:1 (the midpoint).
  204. Day 578MathsDefine sin, cos and tan of an acute angle in a right-angled triangle.
  205. Day 579MathsEvaluate sin 30 + cos 60 and tan 45.
  206. Day 580MathsState the three trigonometric identities. If sin A = 3/5, find cos A.
  207. Day 581MathsThe angle of elevation of the top of a tower from a point 30 m away is 45 degrees. Find the height of the tower.
  208. Day 582MathsWhat is a tangent to a circle? State the relationship between a tangent and the radius at the point of contact.
  209. Day 583MathsHow many tangents can be drawn from an external point to a circle, and what is special about them?
  210. Day 584MathsFind the area of a sector of a circle of radius 7 cm with a central angle of 90 degrees. (Take pi = 22/7.)
  211. Day 585MathsThe class marks and frequencies of a data set are: (10, 2), (20, 3), (30, 5). Find the mean.
  212. Day 586MathsA die is rolled once. Find the probability of getting an even number.
Days 587–592

Revision & self-test

Lock it in for good▾
  1. ★Day 587Revise every Class 8 concept - redo the ones that felt tricky
  2. ★Day 588Revise every Class 9 concept - play with the interactive diagrams
  3. ★Day 589Revise Class 10 Physics & Chemistry
  4. ★Day 590Revise Class 10 Biology & Maths
  5. ★Day 591Self-test: recall each 'why' and memory trick from memory
  6. ★Day 592Clear the last doubts with the AI tutor + target weak areas

Small steps, every day.

Ninety days from today, this whole foundation can be second nature. Open today's concept, and if anything is unclear, the AI tutor is one tap away.

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