When an alternating voltage is given as \(E = (6 sin\omega t - 2 cos \omega t)\) volt, what is its RMS value?
1. \(4 \sqrt 2 \) V
2. \(2 \sqrt 5\) V
3. \(2 \sqrt 3\) V
4. \(4\) V

Subtopic:  RMS & Average Values |
 77%
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Current through an elements in ac circuit is said to be wattless, when the elements is

1. Pure inductor (L)

2. Pure capacitor (C)

3. Series L-C circuit

4. All of these

Subtopic:  LC Oscillations (OLD NCERT) |
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An LC circuit contains an inductor (L=25 mH) and a capacitor (C=25 mF) with an initial charge of Q0. At what time will the circuit have an equal amount of electrical and magnetic energy?

1. π160 s

2. 3π160 s

3. 5π160 s

4. All of these

Subtopic:  LC Oscillations (OLD NCERT) |
 57%
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In which of the following circuits can the power factor be zero?

1. LC circuit

2. LCR circuit

3. Purely resistive circuit

4. Both (1) & (2)

Subtopic:  LC Oscillations (OLD NCERT) |
 55%
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The quality factor of the resonance circuit is given by (symbols have usual meanings)

1.ω0LR
2. 1ω0RC
3. ω0C R
4. Both (1) & (2)

 

Subtopic:  LC Oscillations (OLD NCERT) |
 79%
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In the given circuit, switch S is closed at t=0. After a long time, the iron rod is withdrawn from the inductor L. Then, the bulb

1. Glow with the same brightness

2. Glows more brightly

3. Gets dimmer

4. Stops glowing

Subtopic:  Different Types of AC Circuits |
 67%
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The circuit is in a steady state when the key is at position 1. If the switch is changed from position 1 to position 2, then the steady current in the circuit will be:
  
1. \(E_o \over R\)
2. \(E_o \over 3R\)
3. \(E_o \over 2R\)
4. \(E_o \over 4R\)

Subtopic:  Different Types of AC Circuits |
 62%
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LCR series circuit is connected with an alternating emf source. If the peak current and voltage are l0 and V0 respectively then at resonance the value of wattless current is

1. l0
2. l02
3. 2l0
4. zero 

Subtopic:  Different Types of AC Circuits |
 62%
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The value of quality factor ( Q-value) of the series resonant circuit with inductance L = 2.0 H, capacitance C= 32 μF and resistance R = 10 Ω, is

1. 25

2. 250

3. 0.25

4. 2.5

Subtopic:  LC Oscillations (OLD NCERT) |
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Given below are two statements.
 
Assertion (A): When a current \(I=(3+4 sin \omega t)\) flows in a wire, then the reading of a dc ammeter connected in series is \(4\) units.
Reason (R): A dc ammeter measures only the value of the current amplitude.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  AC vs DC |
 59%
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