CBSE Class 12 Physics Board Exam 2025: CBSE has released the date sheet for class 10th and 12th board exam 2025. The Class 12 Physics exam is scheduled for February 21, 2025, while the exam will start on February 15 and end on April 4, 2025. With less than three months to go, students are preparing intensively for this important exam.
To help students excel, Shailendra Pandey of Physics Wallah has shared a list of expected questions for key chapters like Ray Optics, Wave Optics, and Dual Nature of Matter and Radiation. Along with these insights, students should focus on textbooks, sample papers, sample questions, and previous year papers available on the CBSE website.
CBSE Board Exam 2025: Expected Questions from Ray Optics and Optical Instruments, Wave Optics, and Dual Nature of Matter and Radiation
Chapter 9: Ray Optics and Optical Instruments
Question 1: Derive the mirror formula and explain the sign conventions used.
Question 2: Derive the lens manufacturer’s formula for a convex lens.
Question 3: Explain the phenomenon of total internal reflection with examples.
Question 4: Explain the working of compound microscope.
Chapter 10: Wave Optics
Question 1: Derive the conditions for constructive and destructive interference in Young’s double-slit experiment.
Question 2: Explain the phenomenon of diffraction in a single slit.
Question 3: Derive an expression for the central maximum width in single-slit diffraction.
Chapter 11: The Dual Nature of Matter and Radiation
Question 1: Derive an expression for the de Broglie wavelength of a particle.
Question 2: Explain the photoelectric effect and state Einstein’s photoelectric equation.
Question 3: Draw a graph to show the variation of photocurrent:
- Light intensity
- Frequency of light
- Possible differences
Question 4: Numerical: Calculate the threshold frequency of a material with a given work function.
Question 5: Numerical: Calculate the kinetic energy of a photoelectron emitted when light of a specific wavelength shines on a metal surface.
CBSE Board Exam 2025: Important Tips for Class 12 Physics Exam 2025
Make a study plan: Divide your study time between theory and numerical (ie, 40% theory, 60% numerical). Make sure to allocate time for daily revision and mock tests to stay on track and regularly assess your progress.
Master the basics: Ensure a clear understanding of basic concepts, formulas, and definitions. Revise key formulas and derivatives daily and maintain a formula sheet for quick reference during revision sessions.
Practice Numerical: Solve all solved and unsolved numericals from NCERT focusing on high weightage topics like Current Electricity, Electrostatics, Ray and Wave Optics, Magnetic Effects of Current, and Alternating Current. Gradually move from reference books to difficult problems.
Focus on important derivatives: Memorize and practice step-by-step derivations, as they are often asked in exams. Focus on derivatives such as the lens maker’s formula, the electric field due to dipoles, the Biot-Savart law, and the EMF in a rotating coil (AC generator).
Solve Sample Papers: Solve at least three sample papers on exam conditions during the last month of preparation. Analyze your performance to identify weak areas, time management issues, and areas that need further revision.
Revise regularly: Revise theoretical concepts, formulas and key questions regularly to strengthen your knowledge. Practice arithmetic and derivatives until you are confident and comfortable solving them in the exam.