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NEET Physics Proficiency Test

Electromagnetic Induction & Alternating Current

Total Marks

50

Total Time

60 minutes

Difficulty

NEET Level

Test Code

WA-PHY-002

Test Instructions:

• Total Marks: 50 | Total Time: 60 minutes
• Section A: 20 MCQs (1 mark each)
• Section B: 6 Descriptive Questions (2 marks each)
• Section C: 4 Descriptive Questions (3 marks each)
• For descriptive questions, use appropriate keywords for better evaluation
• You cannot go back to previous questions once submitted
• Results will be displayed immediately after submission

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60:00

NEET Physics Test

Chapters: Electromagnetic Induction & Alternating Current

Section A: 1 Mark Questions (20 Questions)

1. The phenomenon of electromagnetic induction was discovered by:

James Clerk Maxwell Michael Faraday Heinrich Lenz André-Marie Ampère

2. The SI unit of magnetic flux is:

Tesla Weber Henry Gauss

3. Lenz's law is a consequence of the law of conservation of:

Energy Charge Momentum Mass

4. The direction of induced current is given by:

Faraday's law Lenz's law Ampere's law Ohm's law

5. The self-inductance of a solenoid depends on:

Current through it Voltage applied Number of turns per unit length Material of the wire

6. The mutual inductance between two coils depends on:

Current in the coils Relative orientation of coils Material of the wires Voltage applied

7. Eddy currents are used in:

Transformers Induction furnaces Electric brakes All of the above

8. The coefficient of mutual induction has the unit:

Weber Henry Tesla Farad

9. In a pure inductor, the current:

Leads the voltage by π/2 Lags the voltage by π/2 Is in phase with voltage Is independent of voltage

10. The time constant of an LR circuit is:

L/R R/L LR 1/LR

11. The RMS value of alternating current is equal to:

Peak value Peak value/√2 Average value Instantaneous value

12. In an AC circuit containing only capacitance, the current:

Lags behind voltage by 90° Leads the voltage by 90° Remains in phase with voltage Is independent of voltage

13. The power factor of an AC circuit is given by:

R/Z Z/R RZ 1/RZ

14. The device used to increase or decrease AC voltage is:

Transformer Rectifier Dynamo Motor

15. In a series LCR circuit at resonance, the impedance is:

Maximum Minimum Zero Infinity

16. The quality factor (Q-factor) of a series resonant circuit is given by:

ωL/R R/ωL ωLR 1/ωLR

17. In an AC generator, the magnitude of induced emf depends on:

Speed of rotation Number of turns Strength of magnetic field All of the above

18. The average power consumed in an AC circuit is given by:

V_rms × I_rms V_rms × I_rms × cosφ V_max × I_max V_max × I_max × cosφ

19. The phase difference between voltage and current in a pure resistive circuit is:

0° 90° 180° 270°

20. The capacitive reactance of a capacitor in an AC circuit is:

Directly proportional to frequency Inversely proportional to frequency Independent of frequency Proportional to square of frequency

Section B: 2 Mark Questions (6 Questions)

21. State Faraday's laws of electromagnetic induction.

22. Explain Lenz's law with an example.

23. Differentiate between self-induction and mutual induction.

24. What are eddy currents? Give one application.

25. Define RMS value of alternating current. How is it related to peak value?

26. What is power factor? Why is it important in AC circuits?

Section C: 3 Mark Questions (4 Questions)

27. Derive an expression for the induced emf in a straight conductor moving in a uniform magnetic field.

28. Explain the principle, construction and working of an AC generator with a neat diagram.

29. Derive an expression for impedance in a series LCR circuit. Show the phase relationship between voltage and current.

30. Explain the principle of transformer. Derive the relationship between primary and secondary voltages with number of turns.

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RESULTS

0/50

1-Mark Questions: 0/20

2-Mark Questions: 0/12

3-Mark Questions: 0/12

Percentage: 0%

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