Electrostatic Potential and Capacitance MCQ Questions for Class 12 Physics Chapter 2 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Physics book Chapter 2 Electrostatic Potential and Capacitance with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Electrostatic Potential and Capacitance. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.


NCERT MCQ Chapters for Class 12 Physics

Q1. Equipotential surfaces

(i) are closer in regions of large electric fields compared to regions of lower electric fields.
(ii) will be more crowded near sharp edges of a conductor.
(iii) will always be equally spaced.
(iv) both (i) and (ii) are correct.

(iv) both (i) and (ii) are correct.


Q2. Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor ?

(i) 72 V
(ii) 60 V
(iii) 48 V
(iv) zero

(i) 72 V


Q3. The electric potential V at any point O (x, y, z all in metres) in space is given by V = 4x² volt. The electric field at the point (1 m, 0, 2 m) in volt/metre is

(i) 8 along negative x-axis
(ii) 8 along positive x-axis
(iii) 16 along negative x-axis
(iv) 16 along positive z-axis

(i) 8 along negative x-axis


Q4. Consider a uniform electric field in the z direction. The potential is not a constant

(i) in all space.
(ii) for any x for a given z.
(iii) for any y for a given z.
(iv) on the x-y plane for a given z.

(i) in all space.


Q5. Which of the following statement is true?

(i) Electrostatic force is a conservative force.
(ii) Potential at a point is the work done per unit charge in bringing a charge from any point to infinity.
(iii) Electrostatic force is non-conservative
(iv) Potential is the productof charge and work.

(i) Electrostatic force is a conservative force.


Q6. The capacitance of a capacitor will decrease if we introduce a slab of:

(i) copper
(ii) aluminium
(iii) zinc
(iv) None of these

(iv) None of these


Q7. Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately

(i) spheres
(ii) planes
(iii) paraboloids
(iv) ellipsoids

(i) spheres


Q8. A positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge

(i) remains a constant because the electric field is uniform.
(ii) increases because the charge moves along the electric field.
(iii) decreases because the charge moves along the electric field.
(iv) decreases because the charge moves opposite to the electric field.

(iii) decreases because the charge moves along the electric field.


Q9. In a region of constant potential

(i) the electric field is uniform.
(ii) the electric field is zero.
(iii) there can be no charge inside the region.
(iv) both (ii) and (iii) are correct.

(iv) both (ii) and (iii) are correct


Q10. In which of the following forms is the energy stored in a capacitor?

(i) Charge
(ii) Potential
(iii) Capacitance
(iv) Electric field

(iv) Electric field


Q11. If a unit positive charge is taken from one point to another over an equipotential surface, then

(i) work is done on the charge.
(ii) work is done by the charge.
(iii) work done is constant.
(iv) no work is done.

(iv) no work is done.


Q12. For equipotential surfaces, which statement is not correct?

(i) are closer in regions of large electric fields compared to regions of lower electric fields.
(ii) will always be equally spaced.
(iii) will be more crowded near sharp edges of a conductor.
(iv) will be more crowded near regions of large charge densities.

(ii) will always be equally spaced.


Q13. A test charge is moved from lower potential point to a higher potential point. The potential energy of test charge will

(i) remain the same
(ii) increase
(iii) decrease
(iv) become zero

(iii) decrease


Q14. Twenty seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop ?

(i) 180 V
(ii) 90 V
(iii) 120 V
(iv) 45 V

(ii) 90 V


Q15. The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is

(i) proportional to the square root of the distance between the plates.
(ii) linearly proportional to the distance between the plates.
(iii) independent of the distance between the plates.
(iv) inversely proportional to the distance between the plates.

(iii) independent of the distance between the plates.


Q16. In a region of constant potential

(i) the electric field is uniform
(ii) the electric field is zero
(iii) there can be charge inside the region.
(iv) the electric field shall necessarily change if a charge is placed outside the region.

(ii) the electric field is zero


Q17. A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system

(i) increases by a factor of 4.
(ii) decreases by a factor of 2.
(iii) remains the same.
(iv) increases by a factor of 2.

(ii) decreases by a factor of 2.


Q18. If a conductor has a potential V ≠ 0 and there are no charges anywhere else outside, then

(i) there must be charges on the surface or in¬side itself.
(ii) there cannot be any charge in the body of the conductor.
(iii) there must be charges only on the surface.
(iv) both (i) and (ii) are correct.

(iii) there must be charges only on the surface.


Q19. The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :

(i) 1.8 J
(ii) 2.4 J
(iii) 1.8 µJ
(iv) 2.4 µJ

(ii) 2.4 J


Q20. Which of the following options are correct? If a conductor has a potential V 4- 0 and there are no charges anywhere else outside, then

(i) there must not be charges on the surface or inside itself.
(ii) there cannot be any charge in the body of the conductor.
(iii) there must be charges only on the surface.
(iv) there must be charges inside the surface.

(ii) there cannot be any charge in the body of the conductor.


Q21. ielectric constant for a metal is

(i) zero
(ii) infinite
(iii) 1
(iv) 10

(ii) infinite


Q22. A bird sitting on a high power line:

(i) gets killed instantly
(ii) gets a mild shock
(iii) gets a fatal shock
(iv) is not affected practically

(iv) is not affected practically


Q23. 64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the small drop is q, then the charge on the big drop will be

(i) 2q
(ii) 4q
(iii) 16q
(iv) 64q

(iv) 64q


Q24. In a parallel plate capacitor, the capacity increases if

(i) area of the plate is decreased.
(ii) distance between the plates increases.
(iii) area of the plate is increased.
(iv) dielectric constantly decreases.

(iii) area of the plate is increased.


Q25. Choose the SI unit of electric potential energy :

(i) Joule
(ii) Coulomb
(iii) Netwon per coulomb
(iv) Erg

(i) Joule


Q26. A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the:

(i) cell is < E

(ii) cell is E

(ii) cell is > E
(iv) capacitor is E

(ii) cell is E


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