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AC Circuits Physics - AC Circuits

Maharashtra Board - STD 12 - Physics (MSBSHSE - Semi English Medium). 128 questions in this chapter.

Question types

AC Circuits question types

128 questions across 4 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

128
Questions
4
Question groups
5
Question types
Sample Questions

AC Circuits questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
In a series LCR circuit the phase difference between the voltage and the current is 45°. Then the power factor will be
  • A
    0.607
  • ✓
    0.707
  • C
    0.808
  • D
    1

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
In an $A C$ circuit, e and $i$ are given by $e=150 \sin (150 t ) V$ and $i=150 \sin \left(150 t+\frac{\pi}{3}\right) A$. the power dissipated in the circuit is
  • A
    106W
  • B
    150W
  • ✓
    5625W
  • D
    Zero

Answer: C.

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Q 3M.C.Q (1 Marks)1 Mark
In a circuit L, C & R are connected in series with an alternating voltage of frequency f. the current leads the voltage by 450. The value of C is
  • A
    $\frac{1}{\pi f(2 \pi f L-R)}$
  • ✓
    $\frac{1}{2 \pi f(2 \pi f L-R)}$
  • C
    $\frac{1}{\pi f(2 \pi f L+R)}$
  • D
    $\frac{1}{2 \pi f(2 \pi f L+R)}$

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark
A resistor of $500 \Omega$ and an inductance of $0.5 H$ are in series with an $AC$ source which is given by $V=100 \sqrt{2} \sin (1000 t)$. The power factor of the combination
  • ✓
    $\frac{1}{\sqrt{2}}$
  • B
    $\frac{1}{\sqrt{3}}$
  • C
    0.5
  • D
    0.6

Answer: A.

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Q 5M.C.Q (1 Marks)1 Mark
If the RMS current in a $50 Hz AC$ circuit is $5 A$, the value of the current $\frac{1}{300}$ seconds after its value becomes zero is
  • A
    $5 \sqrt{2} A$
  • ✓
    $5 \sqrt{\frac{3}{2}} A$
  • C
    $\frac{5}{6} A$
  • D
    $\frac{5}{\sqrt{2}} A$

Answer: B.

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Q 15Answer the following in Brief3 Marks
An ac voltage of rms value $1 V$ is applied to a parallel combination of inductor $L =10 mH$ and capacitor $C =4 \mu F$. Calculate the resonant frequency and the current through each branch at resonance.
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Q 16Answer the following in Detail4 Marks
A $100 \mu F$ capacitor is charged with a $50\ V$ source supply. Then source supply is removed and the capacitor is connected across an inductance, as a result of which $5\ A$ current flows through the inductance. Calculate the value of the inductance.
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Q 17Answer the following in Detail4 Marks
A $10 \mu F$ capacitor is charged to a $25$ volt of potential. The battery is disconnected and a pure $100\ mH$ coil is connected across the capacitor so that $LC$ oscillations are set up. Calculate the maximum current in the coil.
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