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• 1. State Snell’s law.
• 2. Define atomicity.
• 3. Calculate the gram molecular mass of CO2
• 4. Write a short note on mesophyll.
• 5. What is a respiratory quotient?
• 6. Calculate the velocity of a moving body of mass 10Kg whose linear momentum is 2KgmS-1
• 7. State Newton’s first law.
• 8. What are the causes of myopia?
• 9. Define inertia. Give its classification.
• 10. State Snell’s law.
• 11. Define atomicity.
• 12. Define relative atomic mass?
• 13. Write the differences between atoms and molecules
• 14. Write any two applications of Avogadro’s law.
• 15. What is Photosynthesis? Write it equation.
• 16. What is rust? Give the equation for the formation of rust.
• 17. Calculate the molecular mass of water.
• 18. What are chloroplast and write the functions of chloroplast?
• 19. Draw the overview of Hill and Calvin cycle?
• 20. Define respiratory quotient?
• 21. Write the applications of the concave lenses?
• 22. Define atomicity?
• 23. Match the following:
1. 8 g of O2 – 4 moles
2. 4 g of H2 – 0.25 moles
3. 52 g of He – 2 moles
4. 35.5 g of Cl2 – 0.5 moles
• 24. Define dispersion of light?
• 25. Write the functions of the epidermal tissue system?
• 26. Differentiate mass and weight?
• 27. If 5 N and 15 N forces are acting opposite to one another. Find the resultant force and the
direction of the resultant force?
• 28. What is a collateral vascular bundle?
• 29. Differentiate aerobic and anaerobic respiration?
• 30. Where do the light-dependent reaction and Calvin cycle occur in the chloroplast?
• 31. Answer the following questions using the data given below:
i) A and R are correct, R explains the A
ii) A is correct, R is wrong
iii) A is wrong, R is correct
iv) A and R are correct, R doesn’t explain A
• 32. Define atomicity?
• 33. Calculate the number of water molecules present in one drop of water that weighs 0.18 g?
• 34. Define inertia. Give its classification?
• 35. State Newton’s second law?
• 36. Differentiate mass and weight?
• 37. Define one calorie

• 38. Define the unit of current
• 39. State ohm’s law
• 40. Match the following
A. Electric current – volt
B. Potential difference – ohm meter
C. Specific resistance – watt
D. Electrical power –joule
E. Electrical energy – ampere
• 41. True or false (if false give the correct statement)
A. Moseley’s periodic table is based on atomic mass
B. An alloys is a homogeneous mixture of metals
• 42. What is meant by binary solution?
• 43. To match
A. Blue vitriol – CaSO4 H2o
B. Gypsum. – Cao
C. Deliquescence – CaSO4 H2o
D. Hygroscopic – NaOH
• 44. Who discovered Rh factor? Why was it named so?
• 45. What do you understand by the term phenotype and genotype?
• 46. Write the difference between endocrine and exocrine gland
• 47. How can menstrual hygiene be maintained during menstrual days?
• 48. State Ohm’s law.
• 49. a) ________ acts as a buffer and also helps in the regulation of pH and body temperature.
b) The essential parts of a flower are __________.
• 50. Distinguish between resistivity and conductivity.
• 51. a) Name two-layered protective covering of the human heart.
b) Which hormone induces parthenocarpy in tomatoes?
• 52. Match the following :
1. Solid – solid (a) Mixture of helium-oxygen gas
2. Liquid – solid (b) Alloys
3. Gas – gas (c) Mercury with Amalgam
4. Solid-liquid (d) NaCl in water
• 53. What are allosomes?
• 54. State True or false (If false give the correct statement).
a. Horizontal rows are called groups. Vertical columns are called periods. Horizontal rows are called
groups. Vertical columns are called periods.
b. Sodium chloride dissolved in water forms a non-aqueous solution.
• 55. Calculate the resistance of a conductor through which a current of 2 A passes, when the potential
difference between its ends is 30 V.
• 56. State Modern periodic law.

• 57. Draw and label the parts of the given hormone.
• 58. State the law of volume
• 59. Define the unit of current
• 60. State Ohm’s law
• 61. What is rust? Give the equation for the formation of rust
• 62. Match the following
A B
i. Blue Vitrol -a. CaSO4 2H₂O
ii. Gypsum – CaO
iii.Deliquescence – Cuso45H₂O
iv. Hygroscopic -NaOH
• 63. Give an example each
a. gas in liquid
b. Solid in liquid
• 64. What would happen to the leaves of a plant that transpires more water than its absorption in the
roots?
• 65. What is bolting? How can it be induced artificially?
• 66. Define Triple fusion.
• 67. What do you understand by the terms phenotype and genotype?
• 68. a. What is a longitudinal wave?
b. What is meant by the reflection of sound?
• 69. State whether the following statements are true or false.If false correct the statement.
a. Gamma radiation is dangerous because it produces an enormous amount of light.
b. Comma radiation is very low.
• 70. Define combination reaction. Give an example for an exothermic combination reaction.
• 71. Define ethnobotany and write its importance.
• 72. What is biofortification?
• 73. How somatic gene therapy differs from germline gene therapy.
• 74. What are psychotropic drugs?
• 75. Why fossil fuels are to be conserved?
• 76. Write down two conditions for hearing the echo.
• 77. State Soddy and Fagan’s displacement law.
• 78. Define combination reaction. Give an example.
• 79. Classify the following compounds based on the pattern of the carbon chain and give their
structural formula:
(i) Propane (ii) Benzene (iii) Cyclobutene (iv) Furan
• 80. Differentiate between outbreeding and inbreeding.

• 81. What are the various routes by which transmission of human immunodeficiency virus takes
place?
• 82. How is a cancer cell different from a normal cell?
• 83. How are e-wastes generated?
• 84. What is the importance of rainwater harvesting?
• 85. Calculate the pH of 1.0×10-4 molar solution of HNO3.
10th Science Important 4 Mark Questions – English Medium
• 1. Define Inertia. Give its classification.
• 2. i) What is Avagodrao Hypothesis.
ii) Write any two applications of Avogadro’s law,
• 3. How many grams are there in the following?
i) 3 moles of Chlorine molecule, Cl2
ii) 4 moles of Phosphorous molecule, P4
• 4. i) What is photosynthesis? ii) Where in a cell it occur?
• 5. i) Draw and Label the Parts of Chloroplast. ii) Write the reaction for photosynthesis.
• 6. An object is placed at a distance 20cm from a convex lens of focal length 10cm. Find the image
distance and nature of the image.
• 7. Differentiate between mass and weight
• 8. (i) What is the power of accommodation of the eye?
(ii) Distinguish between the convex lens and concave lens
• 9. Calculate the velocity of the moving body of mass 5kg whose linear momentum is 2.5 kgms-1
• 10. In a convex lens, when objects are placed between F and C draw the ray diagram and write the
characteristics of image?
• 11. How does the light-dependent reaction differ from the light-independent reaction?
• 12. Write the different types of isotopes of oxygen and its percentage abundance?
• 13. State Avagadro’s hypothesis and write its number?
• 14. What is Hypermeteropia ? What is the cause of it?
• 15. Write any two stages of Aerobic respiration?
• 16. Calculate the number of moles present in 27 grams of Aluminium
• 17. Define inertia. Give its classification?
• 18. Two bodies have a mass ratio of 3:4.The force applied on the bigger mass produces an
acceleration of12ms-2. What could be the acceleration of the other body, if the same force acts on
it?
• 19. Explain the rules for obtaining images formed by a convex lens with the help of a ray diagram?
• 20. What are plastids and give its types?
• 22. List the properties of light?
• 23. What is photosynthesis and wherein a cell does it occur?
• 25. Identify and label the parts?

• 26. Classify the types of force based on their application? Give an example for each type.
• 27. Two bodies have a mass ratio 3:4.The force applied on the bigger mass produces an acceleration
of 12ms-2 .What could be the acceleration of the other body, if the same force acts on it?
• 28. Explain the rules for obtaining images formed by a convex lens with the help of a ray diagram?
• 29. What are casparian strips and Rhizodermis?
• 31. Draw the structure of dicot stem?
• 33. What is photosynthesis and were in a cell does it occur?
• 35. State snell’s law?
• 36. Define electric potential and potential difference?
• 37. Distinguish between ideal gas and real gas
• 38. Three resistors of resistance 5 ohms, 3 ohms, and 2 ohms are connected is series with 10V
battery to calculate their effective resistance and the current following through the circuit.
• 39. What is an aqueous and non-aqueous solution?
• 40. What is an alloy? Give appropriate reasons of alloying
• 41. What is the importance of transpiration?
• 42. ‘ A’ is a blue-colored crystalline salt on heating it loses blue color and to give ‘ B’ when water is
added ‘ B’ gives back to ‘A’. Identify A and B write the equation.
• 43. a) Enumerate any four functions of blood.
b) Name the secondary sex organs in males.
• 44. Differentiate between hygroscopic and deliquescence substances.
• 45. a) The ratio of the potential difference to the current is known as ________.
b) The value of Avogadro number ________.
c) A charge of 12 coulomb flows through a bulb in 5 seconds. What is the current through the bulb?
• 46. Draw a neat diagram of spermatozoan and label the parts.
• 47. a) Write a note on Saturated and Unsaturated solutions.
b) What is rusting? Write the chemical formula of rust.
• 48. a) Define electric potential and electric potential difference.
b) The relation between the different types of scales of temperature:
i. Celsius and Kelvin: K =
ii. Fahrenheit and Kelvin: [K] =
• 49. Explain the structure of a chromosome with a labeled diagram.
• 50. Distinguish between ideal gas and real gas
• 51. A 100-watt electric bulb is used for 5 hours daily, and four 60-watt bulbs are used for 5 hours
daily. Calculate the energy consumed (in kWh) in the month of January.
• 52. State four conditions necessary for rusting of iron
• 53. In what way do hygroscopic substances differ from deliquescent substances?
• 54. A is blue-colored crystalline salt. On heating, it loses a blue color and to give B. When water is
added, B gives back to A. Identify A and B. Write the equation
• 55. What is transpiration? Give the importance of transpiration
• 56. What are the functions of blood?
• 57. Write the physiological effects of gibberellins
• 58. What are the advantages and disadvantages of cross-pollination?
• 59. Explain the structure of the ovum

• 60. Write a short note on i) spontaneous generation or abiogenesis
ii) Match the following.
a. Use and disuse theory — life originates from pre-existing life
b. Interspecific struggle. — competition among the individuals of the same species
c. Intraspecific struggle. —- competition between the organism of different species
d. Biogenesis. —– not used organ gradually degenerates
• 61. Differentiate between outbreeding and inbreeding.
• 62. a.How is a cancer cell different from a normal cell?
b. How is HIV transmitted generally?
• 63. How will you conserve electrical energy?
• 64. i) Match the following health effects of E-waste.
a. Lead. — damage brain and respiratory system
b. Chromium. —- accumulated in kidney and liver, neural damage
c. Cadmium. —- damage CNS and PNS
d. Mercury. —- Asthmatic bronchitis
• 65. a) Explain why the ceilings of concert halls are curved?
b) What do you understand by the term ‘ultrasonic vibration’?
• 66. Write down the benefits of radiation.
• 67. Explain the types of double displacement reactions with examples.
• 68. The molecular formula of alcohol is C4H10O. the locant number of its -OH group is 2.
i) Draw its structural formula. ii) Give its IUPAC name.
• 69. What is called homologous series? Give any three of its characteristics?
• 70. Describe mutation breeding with an example.
• 71. Define Ethnobotany and write its importance.
• 72. How do rainwater harvesting structures recharge groundwater?
• 73. Explain the principles of Lamarckism?
10th Science Important 7 Mark Questions – English Medium
• 1.) i) State Newton’s second law.
ii) Deduced the equation of a force using Newton’s second law of motion.
• 2. i) List any five properties of light. ii) What are the causes of “Myopia”?
• 3. (a) i) Give the salient features of modern atomic theory.
ii) Calculate the mass of 1.51 X 1023 molecules of water.
• 4. i) How does the light-dependent reaction different from the light-independent reaction.
ii) What are the end product and reactant in each?
iii) Where does each reaction occur within the chloroplast?
• 5. State and explain Newton’s laws of motion
• 6. Distinguish between short sight and long sight
• 7. Explain the concepts of “Modern Atomic theory”
• 8. Calculate the molecular mass of Carbondioxide and calcium phosphate (Atomic mass:-
Carbon – 12, Oxygen-16, Calcium-40, Phosphorous-30)
• 9. Discuss the internal structure of Dicot root (Bean)
• 10. i) What are the factors affecting Photosynthesis?
ii) Drae the structure of chloroplast
• 11. i) State newton’s second law of motion?
ii) Deduce the equation of a force using Newton’s second law of motion

• 12. Differentiate the eye defects: Myopia and Hypermetropia.
• 13. Give the salient features of modern atomic theory?
a) Differentiate atoms and molecules?
b) Diffrentiate homoatomic and heteroatomic mole . Give one example each?
• 14. Draw and explain types of Vascular Bundles?
• 15. Describe and name three stages of cellular respiration the aerobic organisms use to obtain energy
from glucose?
• 16. State newton’s law of gravitation and deduce the universal law of gravitation?
• 17. An object is placed at a distance 20 cm from a convex lens of focal length 10 cm. Find the image
distance and nature of the image.
• 18. Give the salient features of modern atomic theory and differentiate atoms and molecules?
• 19. How many grams are there in the following?
i) 2 moles of hydrogen molecule, H2
ii) 3 moles of chlorine molecule, C12
iii) 5 moles of sulphur molecules, S8
iv) 4 moles of the phosphorous molecule, P4
• 20. Explain tissue and tissue system in detail?
• 21. Describe and name three stages of cellular respiration the aerobic organisms use to obtain energy
from glucose?
• 22 Derive the ideal gas equation
• 23. (i) What is meant by electric current
(ii) Name and define it’s unit
(iii) which instrument is used to measure the electric current? How should it be connected in a
circuit?
• 24. Explain the salient features of periods in the modern periodic table
• 25. i) In what way hygroscopic substance differ from deliquescent substance
ii) Define hydrated salt
iii) what is the water crystalline
• 26. (i) Enumerate the function of blood
(ii) write the physiological effects of gibberellins
• 27. (i) Draw the structure of the human ovum and label its parts
(ii) Explain the DNA structure?
• 28. a) What is meant by electric current?
b) Name and define its unit.
c) SI Unit of resistivity, electric power, electric potential
• 29. a) Distinguish between ideal gas and real gas.
b) Define temperature.
c) The SI unit of temperature is __________.
• 30. a) Define amalgam.
b) What are the reasons for alloying?
c) Name the group :
Group 16 –
Group 17 –
Group 18 –

• 31. a) What happens when MgSO4.7H2O is heated? Write the appropriate equation.
b) Define Hydrated salt.
c) A solution is a __________ mixture.
• 32. a) How is the structure of DNA organized?
b) What are the conditions which occur due to lack of ADH and insulin? How are the conditions
different from one another?
33. Describe the different types of expansion of solids
• 34. Describe the various components of a circuit with their uses and symbols
• 35. What are the physical properties of metals?
• 36. Explain the different types of solutions based on the amount of solute
• 37. Describe the different types of hormones produced by the anterior pituitary gland
• 38. Explain the structure of Watson and crick’s model of DNA
• 39. (a) (i) What is real gases? In which conditions the real gases behave as Ideal gases. State the
reasons.
(ii) Define – Ideal gases
• 40. (i) Write notes on electrical conductance and electrical conductivity.
(ii) Give two examples for Conductor and Insulator.
• 41. (i) Write about Hydrated salts and water of crystallization with examples.
ii) Define: Concentrated solutions and dilute solutions.
• 42. i) What is Metal Corrosion
ii) Write the methods of preventing corrosions.
• 43. i) Write a note on the pancreas.
ii) Explain the functions of Pancreatic hormones.
• 44. i) Explain the Mendel’s Dihybrid cross experiments.
• 45. ii) Write the phenotypic ratio of the Dihybrid cross.
• 46. i) Natural selection is the driving force for evolution – How?
ii) Biofortification may help in removing hidden hanger-How?
• 47. i) what is rainwater harvesting?
ii) Explain rooftop rainwater harvesting and Moranis.
iii) List the advantages of rainwater harvesting.
• 48. (A) What is meant by the reflection of sound? Explain:
a) Reflection at the boundary of rarer medium.
b) Reflection at the boundary of denser medium.
c) Reflection at curved surfaces.
• 49. Compare the properties of alpha, beta and gamma radiations.
• 50. (1) What is the pH of 1.0 × 10-5 molar solution of KOH.
(2) A solid compound ‘A’ decomposes on heating into ‘B’ and a gas ‘C’. On passing the gas ‘C’
through water, it becomes acidic. Identify A, B, and C.
• 51. How is ethanol manufactured from sugarcane?
• 52. 1) What are the effects of hybrid vigour in animals.
2) Discuss the importance of biotechnology in the field of medicine.
• 53. Natural selection is a driving force for evolution – How

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