Class 12 Physics 25 Most Expected Questions for Tomorrow’s Exam

Class 12 Physics board exam can feel overwhelming, especially the night before the paper. Students often revise chapters but still wonder, “What are the most expected questions?” If you are appearing for your Class 12 Physics exam tomorrow, we provide the list of 25 most expected questions to help you focus on the right areas.

Here are the 25 most expected questions for Class 12 Physics, based on previous year trends, weightage analysis, and commonly repeated concepts.

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25 Most Expected Questions for Class 12 Physics Exam

Every year, the Class 12 Physics board exam follows a predictable pattern. Certain derivations, definitions, numerical problems, and diagram-based questions are frequently repeated. Based on the previous year, here are the 25 most expected questions for Class 12 Physics CBSE board exam:

1. Use the relation E = -dV/dr to solve problems involving electric field and potential.

2. Given an electric field E = α * r_vector / r, calculate the potential at a certain distance from the origin using E = -dV/dr.

3. Find the position where a third charge should be placed such that the net electric field is zero, given two point charges separated by 30 cm.

4. Determine the equivalent capacitance of a given network where all capacitors have capacitance C.

5. Calculate the work done in moving a test charge once around a circle with a charge at its center. Hint: Consider the concept of an equipotential surface.

6. Calculate the electrostatic potential at the centroid of a triangle Calculate the potential energy of a system of three charges (+q, +q, -q) placed at the vertices of an equilateral triangle.

7. Determine the internal resistance of a cell from its V-I graph.

8. Apply Kirchhoff's laws to a given circuit to find the current flowing through each branch.

9. Calculate the number of electrons passing through a cross-section per second when an 8 mA current flows through a wire.

10. Analyze the motion of a proton, a deuteron, and an alpha particle, accelerated through the same potential difference and entering a uniform magnetic field.

11. Calculate the magnitude and direction of the force exerted by a long straight wire's magnetic field on a proton moving near it.

12. Identify two materials as diamagnetic, paramagnetic, or ferromagnetic based on their given magnetic susceptibility values.

13. Provide one example each for paramagnetic, diamagnetic, and ferromagnetic materials.

14. Calculate the net magnetic field at point P due to all segments for a given wire configuration.

15. Calculate the ratio of magnetic fields at the centers of two circular loops with areas A and 4A carrying specific currents.

16. Calculate the net force on the central wire due to the other two, for three parallel wires arranged in a plane.

17. Calculate the force on a 1 cm wire segment carrying 0.5 A current along the x-axis, due to a magnetic field given in vector form. Hint: Use F = I (L × B).

18. Calculate the input current of a step-down transformer with given efficiency, operating a bulb with specific power and voltage, and a known input voltage.

19. In an LCR circuit, if capacitance is changed from C to nC, determine the factor by which inductance L must be changed to keep the resonant frequency the same.

20. Explain the working principle of an AC generator with a labeled diagram.

21. Find the position of the image when a point source of light is placed in front of a convex glass surface. Hint: Use the spherical surface formula: (n₂/v) - (n₁/u) = (n₂ - n₁)/R.

22. Determine the power of each new lens when a biconcave lens is cut in half perpendicular to the principal axis, forming two plano-concave lenses.

23. Draw the ray diagram for an astronomical telescope forming an image at infinity.

24. Identify the type of extrinsic semiconductor formed and its properties when a Germanium crystal is doped with Boron. Hint: Boron is a trivalent impurity.

25. Calculate the number of photons emitted per second by a monochromatic light source emitting 3.31 mW power at a frequency of 5 x 10¹⁴ Hz.

Last-Minute Prep Tips for the Class 12 Physics Board Exam

The final hours before the Class 12 Physics Board Exam are not meant for learning new topics. They are meant for smart revision, calming your mind, and strengthening what you already know:

• Revise key formulas from Electrostatics, Current Electricity, Magnetism, Optics, and Modern Physics.
• Quickly go through important derivations like Gauss’s Law, Lens formula, YDSE, Bohr’s radius, and Induced EMF.
• Solve 2–3 important numericals from Current Electricity and Magnetism for confidence.
• Practice essential diagrams like AC generator, lens & mirror ray diagrams, p-n junction, and YDSE setup.
• Stay calm, sleep well, and manage exam time by attempting easy questions first, writing formulas clearly, and including units.