Top 50 Most Repeated Physics Questions in JEE Mains

The Joint Entrance Examination (JEE) Mains consistently tests core physics concepts that have appeared over and over across years. This comprehensive list highlights the top 50 most frequently repeated physics questions, helping you focus your preparation efficiently. Mastering these will significantly improve your chances of scoring well in JEE Mains.

1. Mechanics

  1. Projectile Motion: Calculate range, maximum height, time of flight for given velocity and angle.
  2. Newton’s Laws: Problems on friction, tension, inclined planes, and circular motion.
  3. Work-Energy Theorem: Relation between work done and change in kinetic energy.
  4. Conservation of Momentum: Elastic and inelastic collision problems.
  5. Simple Harmonic Motion (SHM): Oscillations of springs and pendulums; calculating period and amplitude.
  6. Rotational Motion: Torque, angular momentum, moment of inertia calculations.
  7. Center of Mass: Finding CM of systems and motion of CM.
  8. Impulse: Calculation of impulse and its relation to change in momentum.
  9. Power and Efficiency: Problems involving mechanical power and efficiency of machines.
  10. Fluid Mechanics: Bernoulli’s theorem, pressure, buoyancy, and viscosity-related questions.

2. Thermodynamics

  1. First Law of Thermodynamics: Calculations involving internal energy, heat, and work done.
  2. Heat Engines and Refrigerators: Efficiency and coefficient of performance.
  3. Gas Laws: Isothermal and adiabatic processes, work done in such processes.
  4. Specific Heat Capacities: Relation between \(C_p\) and \(C_v\), Mayer’s relation.
  5. Calorimetry: Problems on heat transfer and phase changes.

3. Electrostatics

  1. Coulomb’s Law: Forces between point charges, vector addition of forces.
  2. Electric Field: Due to point charges, electric dipoles; field lines and equipotential surfaces.
  3. Electric Potential: Calculations and relation with electric field.
  4. Capacitance: Capacitors in series and parallel; energy stored.
  5. Gauss’s Law: Applications to spheres, cylinders, and planes.

4. Current Electricity

  1. Ohm’s Law: Voltage, current, resistance relationships.
  2. Resistances in Series and Parallel: Calculations of equivalent resistance.
  3. Kirchhoff’s Laws: Junction and loop rules for complex circuits.
  4. Wheatstone Bridge: Condition for balance and finding unknown resistance.
  5. Heating Effect of Current: Power dissipation in resistors.

5. Magnetic Effects of Current and Magnetism

  1. Biot-Savart Law: Magnetic field due to current carrying conductor.
  2. Ampere’s Circuital Law: Magnetic field inside solenoids and toroids.
  3. Force on Current-Carrying Conductor: Calculation of force and torque.
  4. Magnetic Moment and Dipole: Calculation of magnetic dipole moment and related problems.

6. Optics

  1. Laws of Reflection and Refraction: Calculations using Snell’s law.
  2. Lens and Mirror Formulas: Image formation, magnification, and focal length.
  3. Interference: Young’s double-slit experiment, fringe width, and conditions for constructive/destructive interference.
  4. Diffraction: Single slit diffraction and minima positions.
  5. Polarization: Brewster’s angle and Malus’ law.

7. Modern Physics

  1. Photoelectric Effect: Threshold frequency, stopping potential.
  2. Bohr’s Model: Energy levels, spectral lines of hydrogen atom.
  3. Radioactivity: Decay constant, half-life, activity calculations.
  4. Mass-Energy Equivalence: Einstein’s equation \( E = mc^2 \).
  5. X-rays: Production and properties.

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