Most Repeated Questions in Physics Class 12 CBSE Board

Exam Pattern for CBSE Class 12 Physics Exam

The CBSE Class 12 Physics exam is structured to assess students' understanding through a variety of question types, distributed across five sections:

• Section A: 16 questions, including 12 multiple-choice questions (MCQs) and 4 assertion-reasoning questions, each worth 1 mark, totalling 16 marks.

• Section B: 5 very short answer questions, each carrying 2 marks, summing up to 10 marks.

• Section C: 7 short answer questions, each valued at 3 marks, amounting to 21 marks.

• Section D: 2 case study-based questions, each worth 4 marks, totalling 8 marks.

• Section E: 3 long answer questions, each carrying 5 marks, summing up to 15 marks.

Repeated Questions from CBSE Class 12 Physics (2018-2023)

MCQs (1 Mark)

1. What is the SI unit of electric flux? (Electrostatics)

2. A point charge is placed at the centre of a cube. The flux through one face is:(Electrostatics)

3. The drift velocity of electrons increases if:(Current Electricity)

4. What is the unit of magnetic permeability in free space? (Magnetism)

5. What happens to the resolving power of a microscope when wavelength decreases? (Optics)

Short Answer Questions (SAQ, 2–3 Marks)

1. Derive the formula for the equivalent resistance for resistors in parallel. (Current Electricity)

2. Define wavefront. State Huygens' principle. (Wave Optics)

3. Define electric dipole moment. Derive an expression for the electric field along the axial line. (Electrostatics)

4. Explain the working of a potentiometer for measuring emf. (Current Electricity)

5. State the laws of refraction. Explain Snell’s law. (Optics)

6. What are coherent sources? Why are they essential for interference? (Wave Optics)

7. State and derive Ohm’s law in terms of drift velocity. (Current Electricity)

8. Write the relation between magnification, object distance, and image distance for a lens. (Optics)

9. What is the photoelectric effect? Write Einstein’s equation. (Dual Nature of Matter)

10. Explain the concept of rectification. Draw the circuit for a full-wave rectifier. (Semiconductors)

Long Answer Questions (LAQ, 5–6 Marks)

1. Derive the lens maker's formula. (Optics)

2. Explain the working of an AC generator. (Electromagnetic Induction)

3. Using Biot-Savart law, derive the expression for the magnetic field at the centre of a circular current loop. (Magnetism)

4. Derive an expression for energy stored in a parallel plate capacitor. (Electrostatics)

5. Write the principle and workings of a transformer. Why is it not 100% efficient? (Electromagnetic Induction)

6. Explain the Davisson-Germer experiment. Derive the expression for de Broglie wavelength. (Dual Nature of Matter)

7. State and derive the equation for Young’s double-slit experiment. (Wave Optics)

8. Derive an expression for the electric potential due to a dipole at an axial point. (Electrostatics)

9. Derive the expression for the intensity in a diffraction pattern using single-slit diffraction. (Optics)

10. Explain the working of a Zener diode as a voltage regulator. (Semiconductors)

Case-Based Questions (4–5 Marks)

1. Topic: Current Electricity
   A potentiometer is used to measure the internal resistance of a cell. Questions focus on the formula, null point, and length effects.

2. Topic: Optics
   A passage about the dispersion of light in a prism. Questions focus on Snell’s law, angular deviation, and refractive index.

3. Topic: Magnetic Effects of Current
   Passage on a moving coil galvanometer. Questions focus on sensitivity, current sensitivity, and figures of merit.

Frequently Repeated Numerical Topics

1. Capacitor Problems (Energy stored, series and parallel combinations).

2. Resistor Networks (Equivalent resistance, power dissipation).

3. Magnetic Field Calculations (Circular loop, solenoid).

4. Young’s Double-Slit Experiment (Fringe width, path difference).

5. Photoelectric Effect (Kinetic energy, stopping potential).

6. Lens and Mirrors (Image distance, magnification).

7. Nuclear Decay (Half-life, remaining atoms after decay).

How to Use CBSE Class 12 Most Repeated Questions?

• Target Frequently Repeated Topics: Pay attention to chapters like Current Electricity, Electrostatics, Optics, Semiconductors, etc as these chapters are usually revisable for the coming year.

• Solve Year-Specific Questions: Official CBSE question banks should be used for studying in order to get accurate practice.

• Practice Case Studies: Do not forget to read NCERT to have context with case-study-based questions that you are going to attempt.