Electrostatic Potential and Capacitance MCQs with Answers
Electrostatic Potential and Capacitance – MCQs with Answers
Class: 12 |
Subject: Physics |
Section: Electrostatics |
Topic: Electrostatic Potential and Capacitance
Based on: NCERT Syllabus | CBSE Board Examination Standard
Based on: NCERT Syllabus | CBSE Board Examination Standard
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. Electrostatic potential is defined as:
Answer: B
Electrostatic potential at a point is the work done in bringing a unit positive test charge from infinity to that point without acceleration.
Electrostatic potential at a point is the work done in bringing a unit positive test charge from infinity to that point without acceleration.
2. SI unit of electrostatic potential is:
Answer: C
1 Volt = 1 Joule/Coulomb. It represents work done per unit charge.
1 Volt = 1 Joule/Coulomb. It represents work done per unit charge.
3. Potential due to a point charge varies:
Answer: B
V = kQ/r, hence inversely proportional to distance.
V = kQ/r, hence inversely proportional to distance.
4. Equipotential surfaces are always:
Answer: B
No work is done along an equipotential surface, so electric field must be perpendicular.
No work is done along an equipotential surface, so electric field must be perpendicular.
5. Electric field is negative gradient of:
Answer: B
Mathematically, E = −dV/dr.
Mathematically, E = −dV/dr.
6. Capacitance depends on:
Answer: C
Capacitance depends on size, shape, and medium between conductors.
Capacitance depends on size, shape, and medium between conductors.
7. SI unit of capacitance is:
Answer: B
1 Farad = 1 Coulomb/Volt.
1 Farad = 1 Coulomb/Volt.
8. Capacitance of parallel plate capacitor increases if:
Answer: C
Dielectric increases capacitance by factor K.
Dielectric increases capacitance by factor K.
9. Energy stored in capacitor is:
Answer: B
Energy stored = ½CV².
Energy stored = ½CV².
10. Dielectric constant is ratio of:
Answer: B
K = C/C₀, capacitance with and without dielectric.
K = C/C₀, capacitance with and without dielectric.
11. Potential inside a conductor is:
Answer: B
Electric field inside conductor is zero → potential constant.
Electric field inside conductor is zero → potential constant.
12. Work done on equipotential surface is:
Answer: C
No potential difference → no work done.
No potential difference → no work done.
13. Unit of electric field is:
Answer: A
E = Force/Charge.
E = Force/Charge.
14. Series combination capacitance is:
Answer: B
Equivalent capacitance decreases in series.
Equivalent capacitance decreases in series.
15. Parallel combination capacitance is:
Answer: B
Capacitances add directly.
Capacitances add directly.
16. Potential energy of charge system depends on:
Answer: D
All factors influence electrostatic energy.
All factors influence electrostatic energy.
17. Field lines on equipotential surface are:
Answer: B
Electric field always normal to surface.
Electric field always normal to surface.
18. Potential at infinity is assumed:
Answer: B
Reference level chosen zero.
Reference level chosen zero.
19. Breakdown of dielectric occurs due to:
Answer: B
Strong field ionizes dielectric.
Strong field ionizes dielectric.
20. Capacitor stores energy in:
Answer: C
Energy stored in electric field between plates.
Energy stored in electric field between plates.