In the diagram, two sinusoidal voltages of the same frequency are shown. What is the frequency and the phase relationship between the voltages?
        

Frequency in Hz Phase lead of \(N\) over \(M\) in radians
1. \(0.4\) \(-\pi/4\)
2. \(2.5\) \(-\pi/2\)
3. \(2.5\) \(+\pi/2\)
4. \(2.5\) \(-\pi/4\)

Subtopic:  AC vs DC |
 67%
From NCERT
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Which of the following plots may represent the reactance of a series of \(LC\) combinations?

        
1. \(a\)
2. \(b\)
3. \(c\)
4. \(d\)

Subtopic:  Different Types of AC Circuits |
From NCERT
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Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

(a) R=20Ω, L=1.5H,C=35 μF

(b) R=25Ω, L=2.5H,C=45 μF

(c) R=15Ω, L=3.5H,C=30 μF

(d) R=25Ω, L=1.5H,C=45 μF

Subtopic:  Different Types of AC Circuits |
 69%
From NCERT
NEET - 2016
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The potential differences across the resistance, capacitance and inductance are \(80\) V, \(40\) V and \(100\) V respectively in an \(LCR\) circuit. What is the power factor of this circuit?
1. \(0.4\)
2. \(0.5\)
3. \(0.8\)
4. \(1.0\)

Subtopic:  Power factor |
 81%
From NCERT
NEET - 2016
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A 100 Ω resistance and a capacitor of 100 Ω reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

(1) 2.2 A             

(2) 11A

(3) 4.4A               

(4) 112A

Subtopic:  Different Types of AC Circuits |
 57%
From NCERT
NEET - 2016
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A small-signal voltage V(t)=Vo sinωt is applied across an ideal capacitor C 
(1) over a full cycle, the capacitor C does not consume any energy from the voltage source

(2) current I(t) is in phase with voltage V(t)

(3) current I(t) leads voltage V(t) by 180°

(4) current I(t) lags voltage V(t) by 90°

Subtopic:  Different Types of AC Circuits |
 70%
From NCERT
NEET - 2016
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An inductor 20 mH, a capacitor 50μF, and a resistor 40Ω are connected in series across a source of emf V=10sin340t. The power loss in the AC circuit is:

1. 0.67 W

2. 0.78W

3. 0.89 W

4. 0.46 W

Subtopic:  Different Types of AC Circuits |
From NCERT
NEET - 2016
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A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z' the power drawn will be:

1. PRZ2
2. PRZ
3. PRZ
4. P 



Subtopic:  Different Types of AC Circuits |
 56%
From NCERT
NEET - 2015
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A series R-C circuit is connected to an alternating voltage source. Consider two situations:

1. When the capacitor is air-filled.

2. When the capacitor is mica filled.

Current through the resistor is I and voltage across the capacitor is V then

(1)Va<Vb

(2)Va>Vb

(3)ia>ib

(4)Va=Vb

Subtopic:  Different Types of AC Circuits |
 64%
From NCERT
NEET - 2015
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A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6A, the voltage across the secondary coil and the current in the primary coil respectively are
1. 300V,15A
2. 450V,15A

3. 450V,13.5A

4. 600V,15A

Subtopic:  Transformer |
 75%
From NCERT
NEET - 2014
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