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Alternating Current Physics - Alternating Current

Bihar Board (BSEB) - STD 12 Science - Physics (BSEB - English Medium). 41 questions in this chapter.

Question types

Alternating Current question types

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

41
Questions
4
Question groups
5
Question types
Sample Questions

Alternating Current 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 [1M]1 Mark
The AC voltage across a resistance can be measured using:
  1. A potentiometer.
  2. A hot-wire voltmeter.
  3. A moving-coil galvanometer.
  4. A moving-magnet galvanometer.
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Q 2M.C.Q [1M]1 Mark
An AC source is rated 220V, 50Hz. The average voltage is calculated in a time interval of 0.01s, It:
  1. Must be zero.
  2. May be zero.
  3. Is never zero.
  4. Is $\Big(\frac{200}{\sqrt{2}}\Big)\text{V}.$
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Q 3M.C.Q [1M]1 Mark
An AC source rated 100V (rms) supplies a current of 10A (rms) to a circuit. The average power delivered by the source:
  1. Must be 1000W.
  2. May be 1000W.
  3. May be greater than 1000W.
  4. May be less than 1000W.
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Q 4M.C.Q [1M]1 Mark
The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0ms when connected to an AC source. The frequency of the source:
  1. 20Hz.
  2. 50Hz.
  3. 200Hz.
  4. 500Hz.
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Q 5M.C.Q [1M]1 Mark
An AC source producing emf $\in=\in_{0}\Big[\cos\big(100\pi\text{s}^{-1}\big)\text{t}+\cos\big(500\pi\text{s}^{-1}\big)\text{t}\Big]$ is connected in series with a capacitor and a resistor. The steady-state current in the circuit is found to be $\text{i}=\text{i}_1\cos\Big[\big(100\pi\text{s}^{-1}\big)\text{t}+\phi_1\Big]+\text{i}_2\cos\Big[\big(500\pi\text{s}^{-1}\big)\text{t}+\phi_2\Big].$
  1. i1 > i2
  2. i1 = i2
  3. i1 < i2
  4. The information is insufficient to find the relation between i1 and i2
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Q 81 Marks Question1 Mark
A current $\text{i}_1=\text{i}_0\sin\omega\text{t}$ passes through a resistor of resistance R. How much thermal energy is produced in one time period? A current $\text{i}_2=-\text{i}_0\sin\omega\text{t}$ passes through the resistor. How much thermal energy is produced in one time period? If i1, and i2 both pass through the resistor simultaneously, how much thermal energy is produced? Is the principle of superposition obeyed in this case?
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Q 101 Marks Question1 Mark
In a circuit containing a capacitor and an AC source the current is zero at the. stant the source voltage is maximum. Is it consistent with Ohm's law?
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Q 12Short Answer Type Questions [2M]2 Marks
The current in a discharging LR circuit is given by $\text{i}=\text{i}_0\text{e}^{\frac{-\text{t}}{\tau}}$ where $\tau$ is the time constant of the circuit. Calculate the rms current for the period $\text{t}=0$ to $\text{t}=\tau.$
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Q 13Short Answer Type Questions [2M]2 Marks
A resistance is connected to an AC source. If a capacitor is included in the series circuit, will the average power absorbed by the resistance increase or decrease? If an inductor of small inductance is also included in the series circuit, will the average power absorbed increase or decrease further?
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Q 14Short Answer Type Questions [2M]2 Marks
The dielectric strength of air is 3.0 × 106V/m. A parallel-plate air-capacitor has area 20cm2 and plate separation 0.10mm. Find the maximum rms voltage of an AC source that can be safely connected to this capacitor.
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Q 163 Marks Question3 Marks
A coil of inductance 5.0mH and negligible resistance is connected to the oscillator of the previous problem. Find the peak currents in the circuit for $\omega=100\text{s}^{-1},500\text{s}^{-1},1000\text{s}^{-1}.$
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Q 173 Marks Question3 Marks
The voltage and current in a series AC circuit are given by, $\text{V}=\text{V}_0\cos\omega\text{t}$ and $\text{i}=\text{i}_0\sin\omega\text{t}.$ What is the power dissipated in the circuit?
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Q 183 Marks Question3 Marks
A transformer has 50 turns in the primary and 100 in the secondary. If the primary is connected to a 220V DC supply, what will be the voltage across the secondary?
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Q 193 Marks Question3 Marks
An inductor-coil, a capacitor and an AC source of rms voltage 24V are connected in series. When the frequency of the source is varied, a maximum rms current of 6.0A is observed. If this inductor coil is connected to a battery of emf 12V and internal resistance $4.0\Omega,$ what will be the current?
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