Electromagnetic Induction MCQs Class 12 Physics
Electromagnetic Induction – MCQs Class 12 Physics
Class: 12 | Subject: Physics |
Section: Electromagnetic Induction & Alternating Current |
Topic: Electromagnetic Induction
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. Electromagnetic induction is the phenomenon of:
Answer: B
Emf is induced when magnetic flux linked with a circuit changes.
Emf is induced when magnetic flux linked with a circuit changes.
2. SI unit of magnetic flux:
Answer: B
Unit is Weber (Wb).
Unit is Weber (Wb).
3. Faraday’s law states emf ∝
Answer: B
e = − dΦ/dt.
e = − dΦ/dt.
4. Negative sign represents:
Answer: B
Opposes cause of induction.
Opposes cause of induction.
5. Lenz’s law based on:
Answer: B
Prevents energy creation.
Prevents energy creation.
6. Motional emf formula:
Answer: A
Conductor moving in field.
Conductor moving in field.
7. Eddy currents are:
Answer: B
Loop currents in bulk metal.
Loop currents in bulk metal.
8. Eddy currents reduced by:
Answer: A
Laminated sheets.
Laminated sheets.
9. Self induction occurs when:
Answer: A
Due to own current change.
Due to own current change.
10. Unit of inductance:
Answer: C
SI unit Henry.
SI unit Henry.
11. Mutual induction occurs between:
Answer: A
Changing current induces emf.
Changing current induces emf.
12. Transformer works on:
Answer: B
Flux linkage between coils.
Flux linkage between coils.
13. Induced emf increases with:
Answer: D
From Faraday’s law.
From Faraday’s law.
14. Fleming’s right hand rule gives:
Answer: B
Generator rule.
Generator rule.
15. Induction cooktop uses:
Answer: A
Heating via induced currents.
Heating via induced currents.
16. Induced current opposes:
Answer: B
Lenz’s law.
Lenz’s law.
17. Magnetic flux Φ =
Answer: B
Dot product relation.
Dot product relation.
18. Maximum flux when θ =
Answer: A
cos0° = 1.
cos0° = 1.
19. Generator converts:
Answer: B
Based on EMI.
Based on EMI.
20. Back emf in motor due to:
Answer: B
Opposes applied voltage.
Opposes applied voltage.
