In a transformer, the number of turns in the primary and secondary coils is \(410\) and \(1230\) respectively. If the current in the primary is \(6~\text A,\) then what is the current in the secondary coil?
1. \(2~\text A\)
2. \(18~\text A\)
3. \(12~\text A\)
4. \(1~\text A\)

Subtopic:  Transformer |
 75%
From NCERT
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A \(100~\Omega\) resistor is connected to a \(220~\text{V}\), \(50~\text{Hz}\) \(\text{AC}\) supply. The net power consumed over a full cycle is:
1. \(484~\text{W}\) 2. \(848~\text{W}\)
3. \(400~\text{W}\) 4. \(786~\text{W}\)
Subtopic:  Power factor |
 87%
From NCERT
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A \(44\) mH inductor is connected to a \(220\) V, \(50\) Hz AC supply. The RMS value of the current in the circuit is:
1. \(1.0~\text{A}\) 2. \(15~\text{A}\)
3. \(15.92~\text{A}\) 4. \(14.29~\text{A}\)
Subtopic:  Different Types of AC Circuits |
 80%
From NCERT
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Calculate the \(Q\text-\)value of a series \(LCR\) circuit with \(L= 2.0~\text{H}, C = 32~\mu\text{F}\) and \(R = 10~\Omega\).
1. \(35\)
2. \(20\)
3. \(15\)
4. \(25\)

Subtopic:  Different Types of AC Circuits |
 81%
From NCERT
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The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?

   
(a) (b)
   
(c) (d)

Choose the correct option from the given ones:

1. (a) and (d)
2. (a), (b), (c), and (d)
3. (a) and (b)
4.  only (a)

Subtopic:  AC vs DC |
 79%
From NCERT
NEET - 2019
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The peak value of an alternating emf; \(E = E_{0}\sin\omega t\) is \(10~\text V\) and its frequency is \(50~\text{Hz}.\) At a time \(t=\dfrac{1}{600}~\text{s},\) the instantaneous value of the emf will be:
1. \(1~\text V\)
2. \(5\sqrt 3~\text V\)
3. \(5~\text V\)
4. \(10~\text V\)

Subtopic:  RMS & Average Values |
 79%
From NCERT
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The time required for a \(50\) Hz sinusoidal alternating current to change its value from zero to the rms value will be:
1. \(1 . 5 \times 10^{- 2}~\text{s}\)

2. \(2 . 5 \times 10^{- 3}~\text{s}\)

3. \(10^{- 1}~\text{s}\)

4. \(10^{- 6}~\text{s}\)

Subtopic:  RMS & Average Values |
 78%
From NCERT
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A sinusoidal supply of frequency \(10\) Hz and rms voltage of \(12\) V is connected to a \(2.1~\mu\text{F}\) capacitor. What is the rms value of current?
1. \(5.5~\text{mA}\)
2. \(20~\text{mA}\)
3. \(26~\text{mA}\)
4. \(1.6~\text{mA}\)

Subtopic:  Different Types of AC Circuits |
 79%
From NCERT
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In a series \(RLC\) circuit, potential differences across \(R,L\) and \(C\) are \(30\) V, \(60\) V and \(100\) V respectively, as shown in the figure. The emf of the source (in volts) will be:

            

1. \(190\)

2. \(70\)

3. \(50\)

4. \(40\)

Subtopic:  Different Types of AC Circuits |
 89%
From NCERT
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In a series \(LCR\) circuit, the phase difference between voltage across \(L\) and voltage across \(C\) is equal to:
1. Zero 2. \(\pi\)
3. \(\pi \over 2\) 4. \(2\pi\)
Subtopic:  Different Types of AC Circuits |
 75%
From NCERT
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