12th Std Physics Important Five Marks – Public Exam 2025

12th Physics Important five Mark Questions for Public Exam 2025. Chapter-wise questions for effective preparation. Ace your Physics exam!

Chapter 1 : Electrostatics

  1. Electric field due to a dipole a) Axial line b) Equatorial line pg : 22
  2. Electrostatic Potential at a point due to electric dipole  Pg : 30
  3. Applications of Gauss law (4 cases) : Pg : 41
  4. Vandegraff Generator : Pg : 66

Chapter 2 : Current Electricity

  1. Microscopic model of current? Pg : 85
  2. Wheatstone Bridge ? 106
  3. Meter Bridge ? 108
  4. Comparison of emf of two cells with a potentiometer ?
  5. Internal resistance of a cell using Potentiometer ? 111
  6. Internal resistance of a cell using voltmeter?

Chapter 3 : Magnetism and magnetic effects of electric current

  1. Magnetic field due to long straight conductor carrying current
  2. Magnetic Field Produced along the axis of circular coil Pg . 157
  3. Moving coil galvanometer
  4. Discuss the working of cyclotron?

Ln4 : Electromagnetic Induction And Alternating Current

  1. Self induction / Mutual Induction between two long coaxial solenoids Pg : 215
  2. Induction of Emf by changing orientation of coil with magnetic field Pg : 221
  3. Explain the Construction and working of a Transformer ? Pg : 228
  4. Explain the various energy loses in a Transformer ? 2295.Find out the Phase relationship between voltage and current in a pure inductive circuit ? 239
  5. Find out the Phase relationship between voltage and current in a pure capacitive circuit ? 241
  6. Find out the Phase relationship between voltage and current in a RLC series ? Pg : 244

Chapter 5: Electromagnetic waves

  1. Write down maxwell equations in integral form (4 equations)  Pg : 270
  2. Properties of Electromagnetic waves Pg : 272
  3. Types of spectrum Pg : 277 a) Explain the types of emmision spectrum b) Explain the types of absorption spectrum

Chapter 6 : Ray Optics

  1. Derive Mirror Equation?Pg No.8
  2. Describe the Fizeau’s method to determine speed of light. Pg No.11
  3. Obtain lens maker’s formula and mention its significance. Pg No.30
  4. Angle of deviation produced by the prism? Pg No.38

Chapter 7 : Wave Optics

  1. Young’s double slit experiment , equation of path difference & Equation for bandwidth . Pg No. 63,64
  2. Prove laws of reflection using huygen’s Priciple? Pg No. 56
  3. Prove laws of refraction using huygen’s Priciple? Pg No. 56
  4. Discuss the diffraction at single slit and obtain the condition for the nth minimum?

Chapter 10 : Dual Nature of Radiation and Matter

  1. Explain variuos methods of electron emmision? Pg No. 110,111
  2. Explain Einstein’s Photoelectric equation? Pg No. 119
  3. Photo electric cell and their application? Pg No.121
  4. Davisson and germer experiment? Pg No.125
  5. Briefly explain the principle and working of electron microscope. Pg-126

Chapter 9 : Atomic and Nuclear physics

  1. Explain the J.J. Thomson experiment to determine the specific charge of electron. Pg No 143
  2. Discuss the Millikan’s oil drop experiment to determine the charge of an electron.Pg No 145
  3. Derive the equation for radius of the orbit of the electron? Pg No. 153
  4. Derive the equation for the energy of an electron in the nth orbit? Pg No.155
  5. Explain spectral lines of hydrogen atom(Lyman series to Pfund series) Pg No. 162
  6. Obtain law of radioactivity or radio activity decay? Pg No.173
  7. Describe the working of nuclear reactor with a block diagram. Pg No 182
  8. Discuss the alpha decay process with an example?

Chapter 10 : Electronics and Communication

  1. Explain the construction and working of a half wave rectifier? Pg No. 207
  2. Explain the construction and working of a full wave rectifier? Pg No. 208
  3. Sketch the static characteristics of a common emitter transistor and bring out the essence of input and output characteristics? Pg No. 219
  4. State and prove Demorgan’s first and second theorem? Pg No.231,232
  5. Explain transistor as a switch?Pg No 222
  6. Explain transitor as an amplifier,sketch the input and output wave forms?

Chapter11 : Recent Developments in Physics

  1. Discuss the applications of Nanomaterials in various fields. Pg No. 260
  2. Discuss the functions of key components in Robots. Pg No.-264
  3. Comment on the recent advancement in medical diagnosis and therapy. Pg No. 270-274

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