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AC Circuits

Maharashtra Board · Class 12 · Physics

Practice quiz for AC Circuits — Maharashtra Board Class 12 Physics. MCQs and questions with answers to test your preparation.

45 questions20 flashcards5 concepts

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Quick Quiz: AC Circuits

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1

An alternating voltage is given by e = 220 sin(314t). What is the RMS value of the voltage?

2

In a purely resistive AC circuit, the phase relationship between voltage and current is:

3

The inductive reactance of a coil with inductance 0.5 H at frequency 50 Hz is:

4

In a purely inductive circuit, the current:

45 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice

A capacitor of 100 μF is connected to 50 Hz AC supply. The capacitive reactance is:

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31.8 Ω

Capacitive reactance XC = 1/(2πfC) = 1/(2 × 3.14 × 50 × 100 × 10^-6) = 1/0.0314 = 31.8 Ω. Capacitive reactance is inversely proportional to frequency and capacitance.

2multiple correct

Which of the following statements about capacitive circuits are correct?

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Current leads voltage by 90°, Capacitive reactance decreases with frequency, Average power consumed is zero

In capacitive circuits: (1) Current leads voltage by 90° because current flows to charge/discharge the capacitor before voltage builds up, (2) XC = 1/(2πfC) shows inverse relationship with frequency, (3) Average power = 0 as energy oscillates between source and capacitor.

3multiple choice

The impedance of a series LCR circuit with R = 3Ω, XL = 4Ω, and XC = 4Ω is:

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3 Ω

Impedance Z = √[R² + (XL - XC)²] = √[3² + (4 - 4)²] = √[9 + 0] = 3 Ω. When XL = XC, the circuit is at resonance and impedance equals resistance.

4multiple choice

At resonance in a series LCR circuit:

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Current is maximum

At resonance, XL = XC, so impedance Z = R (minimum value). Since I = V/Z, minimum impedance gives maximum current. The circuit behaves as purely resistive with power factor = 1.

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Frequently Asked Questions

What are the important topics in AC Circuits for Maharashtra Board Class 12 Physics?
AC Circuits covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in AC Circuits — Maharashtra Board Class 12 Physics?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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