Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 

Assertion (A): Average power in series LCR ac circuit is maximum at resonance.
Reason (R): At the resonance circuit is purely resistive.


In the light of the above statements choose the correct answer from the options given below:

 
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:  Different Types of AC Circuits |
 76%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 

 
Assertion (A): Current through a pure inductor is wattless.
Reason (R): Phase difference between e.m.f across a pure inductor and current through it is 90 °or π/2 .


In the light of the above statements choose the correct answer from the options given below:
 

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:  Different Types of AC Circuits |
 76%
From NCERT
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Given below are two statements: 

Statement I: DC and AC both can be measured by a hot wire instrument.
Statement II: A hot wire instrument works on the principle of the magnetic effect of current.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.

 
Subtopic:  AC vs DC |
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A: When the frequency of the AC source in a series LCR circuit equals to the resonant frequency, the reactance of the circuit is zero.

R: There is maximum current through the inductor as well as a capacitor at resonance.

1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

2. If both Assertion & Reasons are true but the reason is not the correct explanation of the assertion, then mark (2)

3. If Assertion is a true statement but the reason is false, the mark (3)

4. If both Assertion and Reason are false statements, then mark (4)

 

Subtopic:  Different Types of AC Circuits |
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Given below are two statements: 

Statement I: Average value of AC is always zero in a one-time period.
Statement II: Net charge transferred in one time period of AC is zero.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.

Subtopic:  RMS & Average Values |
From NCERT
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Given below are two statements: 

Statement I: In an LCR circuit, the total energy stored is constant at resonance.
Statement II: Resistance of the LCR circuit doesn't affect the total energy stored in the circuit at resonance.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.

Subtopic:  Different Types of AC Circuits |
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 

Assertion (A): On the increasing frequency of a.c. through a conductor resistance of the circuit may increase.
Reason (R): Resistance of a conductor is directly proportional to the frequency of the a.c. input.


In the light of the above statements choose the correct answer from the options given below:
 

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:  Different Types of AC Circuits |
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 
Assertion (A): A capacitor can replace the choke coils in an AC circuit.
Reason (R): A capacitor can reduce the current in an AC circuit like an inductor


In the light of the above statements choose the correct answer from the options given below:
 

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:  Different Types of AC Circuits |
From 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%
From NCERT
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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) |
 76%
From NCERT
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