In LC oscillation, what is the current in the circuit when the total energy is stored in the form of magnetic energy?
(q0 is the maximum charge stored by the capacitor)

1. Zero 
2. q0Lc 
3. q0LC 
4. q0LC

Subtopic:  LC Oscillations (OLD NCERT) |
 63%
From NCERT
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The variation of alternating current (l) with time (t) is shown in the given graph. The average value of current for half cycle is:
         

1. 2/0π
2. l02
3. l02
4. Zero 

Subtopic:  RMS & Average Values |
From NCERT
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A capacitor and a resistor are connected in series across a.c. supply. Which of the following phasor diagram may be correct?

1.

2.

3.

4.

Subtopic:  Different Types of AC Circuits |
From NCERT
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An inductor of inductance (L), a capacitor of capacitance (C), and a resistor of resistance (R) are connected in series across E=E0sintLC, The reading of hot wire voltmeter connected across the resistor is

1. E0
2. E02
3. E02
4. zero 

Subtopic:  RMS & Average Values |
 80%
From NCERT
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The power factor of a series LCR circuit in resonance condition is:

1. Zero 
2. 12
3. 12
4. 1

Subtopic:  Power factor |
 81%
From NCERT
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What is the instantaneous power of a resistor having resistance R across an ac supply of E=E0sin ωt?

1. E02Rsin2 ωt
2. E02Rcos2 ωt
3. E02R
4. zero 

Subtopic:  Power factor |
 55%
From NCERT
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The ratio of resonant angular frequency and bandwidth of a given series LCR circuit is-

1. Inversely proportional to the angular frequency of ac

2. Directly proportional to the angular frequency of ac

3. Independent of the angular frequency of ac

4. Directly proportional to the square of the angular frequency of a.c

Subtopic:  LC Oscillations (OLD NCERT) |
 55%
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An electric bulb rated 100 W, 40 V has to be operated across 50 V, 50 Hz a.c supply. The capacitance of the capacitor which has to be connected in series will the bulb is

1. 12 F 
2. 24πF
3. 6πF 
4. 11200πF 

Subtopic:  Different Types of AC Circuits |
 68%
From NCERT
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An electricbulb is connected in series with an inductor across a.c supply. When an iron is inserted in the inductor, the brightness of bulb

1. Increases

2. Decreases

3. First increases the deceares

4. Remains the same

Subtopic:  Different Types of AC Circuits |
 72%
From NCERT
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The quality factor of the series resonant circuit is

1. 2πxMaximum energy stored Energy dissipation per cycle 
2. Resonant frequency Band width 
3. Potential difference across capacitor Potential difference across resistor 
4. All of these 

Subtopic:  Different Types of AC Circuits |
 78%
From NCERT
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