CBSE 2024-25 Competency-Based Questions With Answers: The Central Board of Secondary Education (CBSE) has released the competency-focused practice questions for the 2024-25 academic year, covering key subjects for both Class 10 and Class 12. By practicing these questions, students can better familiarise themselves with the format and style of questions likely to appear in the actual exams, improving their confidence and performance. These questions are organised chapter-wise across three volumes per subject. Specifically, for Class 12 Physics, Chapter 1 on Electrostatics, the CBSE has provided competency-based questions designed to enhance understanding and application skills for the 2025 exams. The FREE PDF files include both multiple-choice questions (MCQs) and free-response questions, which are available for download.
CBSE Class 12 Physics Chapter 1 Competency-Based Questions
1. The capacitance of a capacitor is Co. It is connected to a battery of voltage V which charges the capacitor. With the capacitor still connected to the battery, a slab of dielectric material is introduced between the plates of the capacitor. Which of the following explains the effect of the dielectric slab in the above situation?
A. The electric field between the plates of the capacitor rises.
B. The potential difference between the plates falls.
C. The total charge on the capacitor increases.
D. The ability of the capacitor to store charge decreases.
2. The image below shows two examples of electric field lines.
Which of the following statements is true?
A. The electric fields in both I and II arise due to a single positive point charge located somewhere on the left.
B. The electric fields in both I and II can be created by negative charges located somewhere on the left and positive charges somewhere on the right.
C. The electric field in I is the same everywhere but the electric field in II becomes stronger as we move from left to right.
D. As you move from left to right, the electric fields in both I and II become stronger.
3. In a given region, electric potential varies with position as V(x) = 3 + 2x2. Identify which of the following statements is correct.
A. Potential difference between the two points x = 2 and x = ‐2 is 2 V.
B. A charge of 1 C placed at x = 2 experiences a force of 6 N.
C. The force experienced by the above charge is along +x ‐ axis.
D. The electric field in the given region is non‐uniform along x ‐ axis.
4. A parallel plate capacitor is charged to a potential difference V. Two protons P and Q are placed at the two locations inside the capacitor as shown.
Which one of the statements is correct?
A. The forces on the two protons are identical.
B. The force on proton P near the positive plate is more than the force on proton Q.
C. The force on proton Q near the negative plate is more than the force on proton P.
D. The forces on both the protons are zero.
5. In a given region of an electric field, there is no charge present. A closed container is placed in this region of the electric field. What is the requirement for the total flux through the closed container to be zero?
A. The field must be uniform.
B. The container must be symmetric.
C. The container must be oriented in a particular direction.
D. There is no such requirement. The total flux through the container is zero no matter what
6. A uniform electric field of 5000 V/m exists in a certain region. What volume of this space will contain energy equal to 10‐6 J? (Take ∈o = 8.8 x10‐12 SI units)
A. 9 m3
B. 9 x 10‐3 m3
C. 9 x 10‐6 m3
D. 9 x 103 m3
7. Given are three different square arrangements of charges.
(a) Draw relevant vector diagrams to represent the resultant electric field ER at the center of the square in each case.
(b) Identify the arrangement in which the resultant electric field is the smallest at the center of the square.
8. The figure below shows an arrangement of four charges along with some electric field lines drawn between the charges.
(a) Identify three things that are incorrect in this figure.
(b) Draw a correct diagram representing the electric field lines for this system of charges.
9. In the case of a spherical charged conductor of radius R, hollow or solid, the electric potential is constant and maximum inside and on the surface. On the outside, the electric potential varies as, where r is the distance from the center of the sphere.
(a) Represent the variation of electric potential due to a charged sphere with distance graphically.
(b) How does the electric field intensity due to a charged sphere vary with distance r from the center in the above case?
(c) Represent the variation of electric field intensity due to a charged sphere with distance graphically.
10. For a given charge distribution, an equipotential surface is the locus of all points
having the same potential.
Draw two equipotential surfaces for each of the following:
(a) a uniform electric field
(b) a point charge
(c) an infinite straight line of charge
11. Study the graph between electric field intensity E versus the distance r.
(a) Describe the nature of variation of electric field intensity between r = 0 and r ≤ a.
(b) Describe the nature of variation of electric field intensity for r > a.
(c) Give an example of the body of charge distribution that can exhibit the above studied electric field distribution.
12. Given is a pair of parallel charged metal plates in the arrangement as shown.
(a) Sketch the electric field lines between the plates in I and II.
(b) Mention whether net electric field intensity is zero or non‐zero in each case.
13. The dielectric strength of a medium is the minimum electric field required to cause ionization of the medium. For air, this value is taken as 3 million V/m. With this information, find out if a metal sphere of radius 1 cm, surrounded by air, can hold a charge of 1 coulomb.
14. (a) If electric field strength at a point is zero at a given point, then what can you say about the electric potential at that point? Explain.
(b) In the two instances below, state whether electric field intensity and electric potential are zero or non zero at the mid‐point joining the two‐point charges.
15. A metal sphere A of radius a is charged to a potential V. It is enclosed inside a hollow metal shell B of radius b.
What will be the potential of A if it is connected to shell B by a conducting wire? Show the working.
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To access all the practice question of Physics chapter 1 Electrostatics, the complete FREE PDFs are attached here. Click on the 'Download PDF' to get the PDF.
CBSE Class 12 Physics Competency-Based Questions With Answer Key 2024-25 | Download PDF |
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