Class 12 Physics PYQ Quiz - Part 1

 

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Physics Chapter 1: Electric Charges & Fields (PYQs)

Instructions:
1. This quiz contains 25 Previous Year Questions (Part 1). Total Marks = 50.
2. You can select an answer only once for each question. Think before you click!
3. Immediate right/wrong feedback will appear below the question.
4. Click on 'Submit & View Result' at the bottom to see your full performance.

1. A particle of mass m and charge q starts from rest and moves in an electric field E = E<sub>0</sub>î. After travelling a distance x, its kinetic energy will be: (CBSE 2026)

• A) qE<sub>0</sub>x<sup>2</sup>
• B) qE<sub>0</sub><sup>2</sup>x
• C) q<sup>2</sup>E<sub>0</sub>x
• D) qE<sub>0</sub>x

2. Two identical point charges are placed at vertices A and B of an equilateral triangle. If a hollow conducting sphere of radius l/4 is placed at the third vertex P, the magnitude of electric field at point P becomes: (CBSE 2025)

• A) 2E
• B) E
• C) E/2
• D) Zero

3. An electron is moving with velocity v<sub>0</sub>î. If a uniform electric field E = E<sub>0</sub>ĵ is set up in the region, the electron will: (CBSE 2026)

• A) describe a circular path
• B) describe a helical path
• C) describe a parabolic path
• D) continue moving without any deviation

4. Which one of the following statements is correct? Electric field due to static charges is: (CBSE 2025)

• A) conservative and field lines do not form closed loops.
• B) conservative and field lines form closed loops.
• C) non-conservative and field lines do not form closed loops.
• D) non-conservative and field lines form closed loops.

5. A charged sphere of radius r has surface charge density σ. The electric field on its surface is E. If the radius of the sphere is doubled, keeping charge density the same, the ratio of the electric field on the old sphere to that on the new sphere will be: (CBSE 2024)

• A) 1
• B) 1/2
• C) 1/4
• D) 4

6. Two charged particles P and Q, having the same charge but different masses m<sub>P</sub> and m<sub>Q</sub>, start from rest and travel equal distances in a uniform electric field in time t<sub>P</sub> and t<sub>Q</sub> respectively. The ratio t<sub>P</sub>/t<sub>Q</sub> is: (CBSE 2024)

• A) m<sub>P</sub> / m<sub>Q</sub>
• B) m<sub>Q</sub> / m<sub>P</sub>
• C) √(m<sub>P</sub> / m<sub>Q</sub>)
• D) √(m<sub>Q</sub> / m<sub>P</sub>)

7. An isolated conductor, with a cavity, has a net charge +Q. A point charge +q is inside the cavity. The charges on the cavity wall and the outer surface are respectively: (CBSE 2024)

• A) 0 and Q
• B) -q and Q - q
• C) -q and Q + q
• D) 0 and Q - q

8. An electric dipole is kept in a uniform electric field E. The amount of work done to rotate it from the position of stable equilibrium to that of unstable equilibrium will be: (CBSE 2024)

• A) 2pE
• B) -2pE
• C) pE
• D) zero

9. A point charge situated at a distance 'r' from a short electric dipole on its axis, experiences a force F. If the distance of the charge is '2r', the force on the charge will be: (CBSE 2023)

• A) F/16
• B) F/8
• C) F/4
• D) F/2

10. The magnitude of the electric field due to a point charge object at a distance of 4.0 m is 9 N/C. From the same charged object the electric field of magnitude 16 N/C will be at a distance of: (CBSE 2023)

• A) 1 m
• B) 2 m
• C) 3 m
• D) 6 m

11. An isolated point charge particle produces an electric field E at a point 3 m away from it. The distance of the point at which the field is E/4 will be: (CBSE 2023)

• A) 2 m
• B) 3 m
• C) 4 m
• D) 6 m

12. Which one of the following is NOT a scalar quantity? (CBSE 2023)

• A) Electric field
• B) Voltage
• C) Resistivity
• D) Power

13. A charge Q is placed at the centre of a cube. The electric flux through ONE of its faces is: (CBSE 2023)

• A) Q/ε<sub>0</sub>
• B) Q/2ε<sub>0</sub>
• C) Q/6ε<sub>0</sub>
• D) Q/3ε<sub>0</sub>

14. If the net electric flux through a closed surface is zero, then we can infer that: (CBSE 2020)

• A) no net charge is enclosed by the surface.
• B) uniform electric field exists within the surface.
• C) electric potential varies from point to point inside.
• D) charge is present inside the surface.

15. The electric flux emerging out from a 1C charge is: (CBSE 2020)

• A) 1/ε<sub>0</sub>
• B) 4π
• C) ε<sub>0</sub>4π
• D) ε<sub>0</sub>

16. An electric dipole consisting of charges +q and -q separated by a distance r, is kept symmetrically at the centre of an imaginary sphere of radius R (> r). Another point charge Q is also kept at the centre. The net electric flux coming out of the sphere will be: (CBSE 2020)

• A) (2q + Q) / 4πε<sub>0</sub>
• B) Q / ε<sub>0</sub>
• C) (2q + Q) / ε<sub>0</sub>
• D) 2q / ε<sub>0</sub>

17. The electric flux through a closed Gaussian surface depends upon: (CBSE 2020)

• A) Net charge enclosed and permittivity of the medium.
• B) Net charge enclosed, permittivity of the medium and the size of the surface.
• C) Net charge enclosed only.
• D) Permittivity of the medium only.

18. Two small identical metallic balls having charges q and -2q are kept far at a separation r. They are brought in contact and then separated at distance r/2. Compared to the initial force F, they will now: (CBSE 2026)

• A) attract with a force F/2
• B) repel with a force F/2
• C) repel with a force F
• D) attract with a force F

19. A point P lies at a distance x from the mid-point of an electric dipole on its axis. The electric field at a point P is proportional to: (CBSE 2023)

• A) 1/x<sup>2</sup>
• B) 1/x<sup>3</sup>
• C) 1/x<sup>4</sup>
• D) 1/x<sup>1/2</sup>

20. A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to: (JEE Main)

• A) -Q/2
• B) -Q/4
• C) +Q/4
• D) +Q/2

21. Three-point charges 4q, Q and q are placed on a straight line of length l at points distant 0, l/2 and l respectively. The net force on charge q is zero. The value of Q is:

• A) -q
• B) -2q
• C) -q/2
• D) 4q

22. An electric dipole of length 2 cm is placed at an angle of 30° with an electric field 2 × 10<sup>5</sup> N/C. If the dipole experiences a torque of 8 × 10<sup>-3</sup> Nm, the magnitude of either charge is: (CBSE 2023)

• A) 4 μC
• B) 7 μC
• C) 8 mC
• D) 2 mC

23. The physical quantity having SI unit N/C is: (CBSE 2020)

• A) Electric potential
• B) Electric dipole moment
• C) Electric field
• D) Electric flux

24. Two charges q<sub>1</sub> and q<sub>2</sub> are placed at the centres of two spherical conducting shells of radius r<sub>1</sub> and r<sub>2</sub> respectively. The shells are arranged such that their centres are d [> (r<sub>1</sub> + r<sub>2</sub>)] distance apart. The force on q<sub>2</sub> due to q<sub>1</sub> is: (CBSE 2023)

• A) (1 / 4πε<sub>0</sub>) × (q<sub>1</sub>q<sub>2</sub> / d<sup>2</sup>)
• B) (1 / 4πε<sub>0</sub>) × (q<sub>1</sub>q<sub>2</sub> / (d - r<sub>1</sub>)<sup>2</sup>)
• C) Zero
• D) (1 / 4πε<sub>0</sub>) × (q<sub>1</sub>q<sub>2</sub> / [d - (r<sub>1</sub> + r<sub>2</sub>)]<sup>2</sup>)

25. An electron experiences a force 1.6 × 10<sup>-16</sup> î N in an electric field E. The electric field E is: (CBSE 2023)

• A) 1.0 × 10<sup>3</sup> î N/C
• B) -1.0 × 10<sup>3</sup> î N/C
• C) 1.0 × 10<sup>-3</sup> î N/C
• D) -1.0 × 10<sup>-3</sup> î N/C

📊 Quiz Summary

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