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By Ankit Gupta
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Updated on 15 Feb 2025, 16:02 IST
Preparing for CBSE Class 12 Physics can be tough, but focusing on CBSE Class 12 Physics Most Repeated Questions can make your study process easier. Many questions are asked repeatedly in board exams, and knowing them can help you score better. In this article, we will provide you with a collection of CBSE Class 12 Physics Important and Most Repeated Questions based on previous exam trends.
Over the years, certain topics and questions have appeared frequently in board exams. These questions are important because they highlight key concepts that CBSE focuses on. If you practice these CBSE Class 12 Physics Important Questions, you can understand the exam pattern better and improve your problem-solving skills.
Studying CBSE Class 12 Physics Most Repeated Questions can help you:
The CBSE Class 12 Physics Important and Most Repeated Questions cover chapters that frequently appear in exams. Here are some of the key topics to focus on:
These topics have been seen multiple times in previous CBSE Class 12 Physics exams. Reviewing these can increase your chances of getting similar questions in the 2025 board exam.
Q1. If the net electric flux through a closed surface is zero, then we can infer (2022)
Q2. An electric dipole of length 2 cm is placed at an angle of 30° with an electric field 2x105 N/C. If the dipole experiences a torque of 8 x 10-3 Nm, the magnitude of either charge of the dipole is (2023)
Do Check: CBSE Class 12 Physics Previous Year Question Paper
Q3. Electric flux through a spherical surface shown in the figure, is (2020)
Q4. Does the charge given to a metallic sphere depend on whether it is hollow or solid. Give reason for your answer. (Delhi 2017)
Q5. (a) A uniformly charged large plane sheet has charge density 𝜎=(1/18π)x10-15 C/m2 Find the electric field at point A which is 50 cm from the sheet.
Consider a straight line with three points P, Q and R placed 50 cm from the charged sheet on the right side as shown in the figure. At which of these points, does the magnitude of the electric field due to the sheet remain the same as that at point A and why?
Q6. N small conducting liquid droplets, each of radius r, are charged to a potential V each. These droplets coalesce to form a single large droplet without any charge leakage. Find the potential of the large drop. (2020)
Q7. Draw the equipotential surfaces corresponding to a uniform electric field in the z-direction.
Q8. Draw the equipotential surface due to an electric dipole.
Q9. Draw equipotential surface due to an isolated point charge (-q) and depict the electric field lines. (AI 2020)
Q10. A cube of side 20 cm is kept in a region as shown in the figure. An electric field E exists in the region such that the potential at a point is given by V=10x + 5, where V is in volt and x is in m. Find the electric field E and total electric flux through the cube. (AI 2020)
Q11. The energy required by an electron to jumbo the forbidden band in silicon at room temperature is about (2023)
(a) 0.01 ev
(b) 00.5 eV
(c) 0.7eV
(d) 1.1eV
Q12. The __, a property of materials C, Si, and Ge depends upon the energy gap between their conduction and valence bands. (2020)
Q13. Assertion (A): The resistance of intrinsic semiconductor decreases with increases in its temperature.
Reason (R): The number of conduction electrons as well as hole increase in an intrinsic semiconductor with rise in its temperature.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A)
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A)
(c) Assertion (A) is true, but Reason (R) is False.
(d) Assertion (A) is false, but Reason (R) is true.
(2023)
Q14. A square shaped coil of side 10 cm, having 100 turns is placed perpendicular to a magnetic field which is increasing at 1 T/s. The induced emf in the coil is (2023)
(a) 0.1 V
(b) 0.5 V.
(c) 0.75 V
(d) 1.0 V
Q15. Two identical circular discs, one of copper and another of aluminium, are rotated about their geometrical axes with same angular speed in the same magnetic field acting perpendicular to their planes. Compare the (i) induced emf, and (ii) induced current produced in discs between its centre and edge. Justify your answers. (2021C)
Q16. A flexible wire of irregular shape, abcd , as shown in the figure, turns into a circular shape when placed in a region of magnetic field which is directed normal to the plane of the loop away from the reader. Predict the direction of the induced current in the wire
Q17. A metallic rod PQ of length / is rotated with an angular velocity ω about an axis passing through its mid-point (O) and perpendicular to the plane of the paper, in uniform magnetic field B , as shown in the figure. What is the potential difference developed between the two ends of the rod, P and Q ? (2020)
Q18. The ratio of the nuclear densities of two nuclei having mass numbers 64 and 125 is (2023)
(a) 64/125
(b) ⅘
(c) 5/4
(d) 1
Do Check: CBSE Class 12 Physics Blueprint 2025
Q19. Which of the following statements is not correct according to the Rutherford model? (2020)
(a) Most of the space inside an atom is empty.
(b) The electrons revolve around the nucleus under the influence of coulomb force acting on them.
(c) Most part of the mass of the atom and its positive charge are concentrated at its centre .
(d) The stability of atom was established by the mode.
Q20. The energy of a photon of wavelength λ is (2023)
(a) hc λ
(b) hc/λ
(c) λ /hc
(d) λh/c
Q21. Define the term threshold frequency in photoelectric emission. (2020)
Q22. Sodium light consists of two wavelengths, 5900Ä and 5960Ä. If a slit of width 2x10-4 m is illuminated by sodium light, find t h e separation between the first secondary maxima of the diffraction pattern of the two wavelengths on a screen placed 1.5 m away. (2019C)
Q23. An object is kept 20cm in front of a concave mirror of radius of curvature 60cm. Find the nature and position of the image formed. (2020)
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CBSE Class 12 Physics Most Repeated Questions are those that have frequently appeared in past board exams. These questions help students understand important topics and exam trends.
Key topics include Electrostatics, Magnetism, Current Electricity, Optics, Electromagnetic Induction, and Modern Physics. These chapters often have repeated questions.
To prepare, solve past 10-12 years’ question papers, focus on numerical problems, understand key concepts, and revise regularly to improve accuracy and speed.
You can find CBSE Class 12 Physics Important and Most Repeated Questions in NCERT textbooks, previous year papers, sample papers, and online study resources.
