Current Electricity MCQs for Class 12 Physics (NCERT)
Current Electricity – MCQs for Class 12 Physics
Class: 12 | Subject: Physics |
Section: Current Electricity |
Topic: Current Electricity MCQs (NCERT)
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. Electric current is defined as:
Answer: B
Electric current is the rate of flow of electric charge through a conductor.
Electric current is the rate of flow of electric charge through a conductor.
2. SI unit of current is:
Answer: C
1 Ampere = 1 Coulomb per second.
1 Ampere = 1 Coulomb per second.
3. Ohm’s law states V ∝ I when:
Answer: B
Ohm’s law holds only when temperature and physical conditions remain constant.
Ohm’s law holds only when temperature and physical conditions remain constant.
4. Resistance unit:
Answer: B
SI unit of resistance is Ohm (Ω).
SI unit of resistance is Ohm (Ω).
5. Resistivity depends on:
Answer: C
Resistivity is a property of the material.
Resistivity is a property of the material.
6. R = ρL/A shows resistance depends on:
Answer: D
All factors affect resistance.
All factors affect resistance.
7. Drift velocity is proportional to:
Answer: B
vd ∝ Electric field.
vd ∝ Electric field.
8. Mobility unit:
Answer: A
Mobility = drift velocity / field.
Mobility = drift velocity / field.
9. Kirchhoff’s junction law based on:
Answer: B
Total current entering = leaving.
Total current entering = leaving.
10. Loop law based on:
Answer: B
Energy conservation in loop.
Energy conservation in loop.
11. EMF unit:
Answer: A
EMF measured in volts.
EMF measured in volts.
12. Internal resistance opposes:
Answer: B
Limits current inside cell.
Limits current inside cell.
13. Terminal voltage equals EMF when:
Answer: A
No internal drop.
No internal drop.
14. Wheatstone bridge measures:
Answer: C
Unknown resistance.
Unknown resistance.
15. Bridge balanced when:
Answer: A
P/Q = R/S.
P/Q = R/S.
16. Potentiometer measures:
Answer: B
Accurate EMF measurement.
Accurate EMF measurement.
17. Temperature ↑ → resistance of metal:
Answer: B
More lattice collisions.
More lattice collisions.
18. Superconductors have resistance:
Answer: C
At critical temperature.
At critical temperature.
19. Electric power P =
Answer: A
Power = voltage × current.
Power = voltage × current.
20. Commercial unit of energy:
Answer: B
1 kWh = 3.6×10⁶ J.
1 kWh = 3.6×10⁶ J.