In the given A.C. circuit, the instantaneous current through inductor and capacitor are 0.8 A and 0.4 A respectively. The instantaneous current through the resistor is 

1. 1.2 A

2. 0.6 a

3. 0.4 A

4. 0.8 A

Subtopic:  Different Types of AC Circuits |
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In the LCR series A.C. circuit, as we vary the frequency of A.C. source, peak current is obtained. The value of this peak current, apart from the supply voltage, depends upon (symbols have their usual meaning)

1. L and R

2. L and C

3. R and C

4. R only

Subtopic:  Different Types of AC Circuits |
 61%
From NCERT
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A direct current of \(2~\text{A}\) and an alternating current having peak value \(2~\text{A}\) flow through two identical resistance at the same time. The ratio of heat produced in the two resistance will be:
1. \(1:1\)
2. \(1:2\)
3. \(2:1\)
4. \(4:1\)

Subtopic:  AC vs DC |
 65%
From NCERT
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The inductive reactance and resistance of the L-R circuit are respectively 30 ohm and 40 ohm. The impedance of the circuit is

1. 50 ohm

2. 10 ohm

3. 70 ohm

4. 43 ohm

Subtopic:  Different Types of AC Circuits |
 91%
From NCERT
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A bulb and a capacitor are in series with an A.C. source. On increasing frequency, how will the glow of the bulb change?

1. The glow decreases

2. The glow increases

3. The glow remains the same

4. The glow first decreases then increases

Subtopic:  Different Types of AC Circuits |
 71%
From NCERT
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In the circuit shown, X is joining to Y for a long time, and then X is joined to Z. The total heat produced in R2 is ( symbols have their usual meaning)

 1. LE22R12
2. LE22R22
3.LE22R1R2
4. LE2R22R13

Subtopic:  Different Types of AC Circuits |
 55%
From NCERT
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A transformer has a turn ratio of 1: 5. A DC source of EMF 10 V is applied across its primary. EMF across the secondary will be

1. 50 V

2. 2 V

3. zero

4. 100 V

Subtopic:  Transformer |
 66%
From NCERT
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A series LCR circuit has resistance 2Ω and self inductance 20 mH. Bandwidth of the circuit is (in radian/s)

1. 1000

2. 100

3. 10

4. 11000

Subtopic:  Different Types of AC Circuits |
 79%
From NCERT
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Voltage across the resistor, inductor and capacitor in series LCR circuit are 20 V, 50 V and 50 V respectively. Peak value of the applied source is

1. 20 V

2. 202 V

3. 1202 V

4. 120 V

Subtopic:  Different Types of AC Circuits |
 68%
From NCERT
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The r.m.s value of current for

l= 3sinωt + 4 cosωt is 

1. 5 A

2. 52 A

3. 52A

4. 72A

Subtopic:  RMS & Average Values |
 76%
From NCERT
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