\(12~\text{V},60~\text{W}\) lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of \(220~\text{V}\). Assuming the transformer to be ideal, what is the current in the primary winding?
1. \(0.37 ~\mathrm{A}\)
2. \(0.27 ~\mathrm{A}\)
3. \(2.7 ~\mathrm{A}\)
4. \(3.7 ~\mathrm{A}\)

Subtopic:  Transformer |
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In a series \({LCR}\) circuit, the inductance \({L}\) is \(10~\text{mH}\), capacitance \({C}\) is \(1~\mu\text{F}\) and resistance \({R}\) is \(100~\Omega\). The frequency at which resonance occurs is:
1. \(1.59~\text{kHz}\) 2. \(15.9~\text{rad/s}\)
3. \(15.9~\text{kHz}\) 4. \(1.59~\text{rad/s}\)
Subtopic:  Different Types of AC Circuits |
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NEET - 2023
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The net impedance of circuit (as shown in the figure) will be:
        
1. \(25~\Omega\)
2. \(10\sqrt{2}~\Omega\)
3. \(15~\Omega\)
4. \(5\sqrt{5}~\Omega\)
 
Subtopic:  Different Types of AC Circuits |
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An AC source is connected to the given circuit. The value of \(\phi\) will be:
          
1. \(60^\circ\) 2. \(90^\circ\)
3. \(30^\circ\) 4. \(45^\circ\)
Subtopic:  Different Types of AC Circuits |
 64%
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If \(Z_1\) and \(Z_2\) are the impedances of the given circuits (a) and (b) as shown in figures, then choose the correct option:
         
1. \(Z_1<Z_2\) 2. \(Z_1+Z_2=20~\Omega\)
3. \(Z_1=Z_2\) 4. \(Z_1>Z_2\)

Subtopic:  Different Types of AC Circuits |
 61%
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The maximum power is dissipated for an AC in a/an:
1. resistive circuit 2. \({LC}\) circuit
3. inductive circuit 4. capacitive circuit
Subtopic:  Power factor |
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For very high frequencies, the effective impedance of the circuit (shown in the figure) will be: 
              
1. \(4~ \Omega\)
2. \(6~ \Omega\)
3. \(1~ \Omega\)
4. \(3~ \Omega\)
Subtopic:  Different Types of AC Circuits |
From NCERT
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An ac source is connected to a capacitor \(C\). Due to decrease in its operating frequency:
1. capacitive reactance remains constant 2. capacitive reactance decreases.
3. displacement current increases. 4. displacement current decreases.
Subtopic:  Different Types of AC Circuits |
From NCERT
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A standard filament lamp consumes \(100\) W when connected to \(200\) V AC mains supply. The peak current through the bulb will be:
1. \(0.707\) A
2. \(1\) A
3. \(1.414\) A
4. \(2\) A
Subtopic:  RMS & Average Values |
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NEET - 2022
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An inductor of inductance \(2~\text{mH}\) is connected to a \(220~\text{V}\), \(50~\text{Hz}\) ac source. Let the inductive reactance in the circuit is \(X_1\). If a \(220~\text{V}\) DC source replaces the AC source in the circuit, then the inductive reactance in the circuit is \(X_2\). \(X_1\) and \(X_2\), respectively, are:
1. \(6.28~\Omega\), zero
2. \(6.28~\Omega\), infinity
3. \(0.628~\Omega\), zero
4. \(0.628~\Omega\), infinity
Subtopic:  Different Types of AC Circuits |
 65%
From NCERT
NEET - 2022
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