📖 11th Physics Top 20 Three Mark Questions – Most Repeated (2025)

📚 Ace Your Public Exam with the Top 20 Repeated 3-Mark Questions!
This 11th Physics Top 20 Two Mark Questions Guide is designed to help Tamil Nadu 11th Public Exam 2025 students prepare effectively. It contains chapter-wise, most frequently asked 3-mark questions, compiled from previous year public exams, model tests, and textbook exercises. These frequently repeated questions are vital for scoring high marks in the 3-mark section.

11th physics study material,important three mark questions,pdf download,book

✔ Based on Tamil Nadu 11th Board Exam Syllabus
✔ Top 20 Repeated 3-Mark Questions with Answers
✔ Includes Formula-Based, Conceptual & Definition Questions
✔ Covers Key Diagrams & Derivations

11th Physics top 20 Repeated Three Marks

  1. State Kepler’s three laws / State Kepler’s laws of planetary motion (Repeated 5 times)
  2. Explain the variation of g with latitude/Altitude / Depth (Repeated 3 times)
  3. Using a free-body diagram, show that it is easier to pull an object than to push it (Repeated 3 times)
  4. What are the limitations of dimensional analysis? (Repeated 2 times)
  5. Derive an expression for the energy of a satellite (Repeated 2 times)
  6. How is surface tension related to surface energy? (Repeated 2 times)
  7. Give the expression for linear, area, and volume thermal expansions (Repeated 2 times)
  8. State and explain Lami’s theorem (Repeated 2 times)
  9. Explain the similarities and differences between centripetal and centrifugal forces (Repeated 2 times)
  10. How will you measure the distance of the Moon using the parallax method? (Repeated 2 times)
  11. During a cyclic process, a heat engine absorbs 500J of heat from a hot reservoir, does work, and ejects 300J into the surroundings (cold reservoir). Calculate the efficiency of the heat engine. (Repeated 2 times)
  12. Differentiate between conservative and non-conservative forces (Repeated 2 times)
  13. Write the rules for determining significant figures (Repeated 2 times)
  14. Derive the relation between linear velocity and angular velocity (Repeated 2 times)
  15. Describe Newton’s formula for the velocity of sound waves in air (Repeated 2 times)
  16. An athlete covers 3 rounds on a circular track of radius 50m. Calculate the total distance and displacement traveled by him (Repeated 2 times)
  17. Explain the propagation of error in the division of two quantities (Repeated 2 times)

Other Important Three Questions : ( To Score 90+) Must

  1. Check the correctness of the equation 1/2mv2=mgh\frac{1}{2} mv^2 = mgh21​mv2=mgh using the dimensional analysis method.
  2. Write a note on the triangulation method.
  3. Show that the path of a projectile is a parabola.
  4. Derive the relation between linear velocity and angular velocity.
  5. A particle moves along the x-axis in such a way that its coordinates vary with time t according to the equation x=2−5t+6t2x = 2 – 5t + 6t^2x=2−5t+6t2. What is the initial velocity of the particle?
  6. Discuss the properties of scalar products.
  7. Arrive at an expression for power and velocity.
  8. State and prove the Parallel Axis Theorem.
  9. Write the applications of Dimensional analysis.
  10. A car takes a turn with a velocity of 50 m/s on a circular road of radius 10 m. Calculate the centrifugal force experienced by a person of mass 60 kg inside the car.
  11. A wire 10 m long has a cross-sectional area of 1.25×10−4 m21.25 \times 10^{-4} \, m^21.25×10−4m2. It is subjected to a load of 5 kg. If Young’s modulus of the material is 4×1010 N/m24 \times 10^{10} \, N/m^24×1010N/m2, calculate the elongation produced in the wire. (Take g = 10 m/s²).
  12. Distinguish between streamlined flow and turbulent flow.
  13. State Pascal’s law in fluids.
  14. State Archimedes’ principle.
  15. How is surface tension related to surface energy?
  16. Give the characteristics of elastic and inelastic collisions.
  17. Define displacement and distance.
  18. Write down the kinematic equations for angular motion.
  19. What is the difference between velocity and average velocity?
  20. What is inertia? Give the types of inertia.
  21. Explain the propagation of errors in addition.
  22. Differentiate between static friction and kinetic friction.
  23. Explain with graph the work done by a constant force.
  24. Obtain an expression for the excess pressure inside a liquid drop.
  25. Give an expression for work done in an isothermal process.
  26. An object is thrown with an initial speed of 5 m/s at an angle of projection of 30°. Calculate the maximum height reached and the horizontal range.
  27. Explain the RADAR pulse method for determining large distances.
  28. We use a straw to suck soft drinks. Why?
  29. Explain Resonance. Give an example.
  30. What are the conditions for a reversible process?
  31. A force of (4i^−3j^+5k^)(4\hat{i} – 3\hat{j} + 5\hat{k})(4i^−3j^​+5k^) N is applied at a point whose position vector is (7i^+4j^−2k^)(7\hat{i} + 4\hat{j} – 2\hat{k})(7i^+4j^​−2k^) m. Find the torque of the force about the origin.
  32. Compare progressive waves and stationary waves.
  33. Derive an expression for the elastic energy stored per unit volume of a wire.
  34. Two bodies of masses m and 4m are placed at a distance r. Calculate the gravitational potential at a point on the line joining them where the gravitational field is zero.
  35. Mention the salient features of static and kinetic friction.
  36. The resultant of two vectors A and B is perpendicular to vector A, and its magnitude is equal to half of the magnitude of vector B. Find the angle between A and B.
  37. Write a note on the triangulation method to measure larger distances.
  38. Check the correctness of the equation V=u+atV = u + atV=u+at.
  39. What are inertial frames?
  40. Explain the inertia of rest with two examples.
  41. Derive the expression for the work done in an isothermal process.
  42. Write any three postulates of the kinetic theory of gases.
  43. What are the applications of viscosity?
  44. Why are there no lunar eclipses and solar eclipses every month?
  45. What is the relation between torque and angular momentum?
  46. What is radius of gyration?
  47. Derive the expression for loss of kinetic energy in a perfect inelastic collision.
  48. Show that impulse is the change of momentum.
  49. Calculate the area of the triangle for which two of its sides are given by the vectors A=5i−3j,B=4i+6jA = 5i – 3j, B = 4i + 6jA=5i−3j,B=4i+6j.
  50. Derive the dimensional formula for the expression hCG\frac{hC}{G}GhC​, where h is Planck’s constant, C is the speed of light, and G is the gravitational constant.
  51. Explain the similarities and differences of centripetal and centrifugal forces.
  52. Prove that the equation X=Asin⁡(ωt)+Bcos⁡(ωt)X = A\sin(\omega t) + B\cos(\omega t)X=Asin(ωt)+Bcos(ωt) represents a simple harmonic motion.
  53. What are the energies possessed by a liquid? Write down their equations.
  54. What are the conditions for unstable equilibrium?
  55. State and prove the law of conservation of total linear momentum.
  56. State the properties of the vector cross product.
  57. Explain the variation of g with altitude.
  58. Draw the PV diagram for isothermal expansion and isobaric compression processes.
  59. Write the expression for RMS speed, Average Speed, and most probable speed of a gas molecule.
  60. State Perpendicular Axes Theorem of moment of inertia.
  61. In the cricket game, a batsman strikes the ball with the speed 30 m/s at an angle 30° with the horizontal. Will the ball go for a six?
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