A capacitor acts as an infinite resistance for 

1.  DC

2.  AC

3.  DC as well as AC

4.  neither AC nor DC

Subtopic:  Different Types of AC Circuits |
 71%
From NCERT
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An AC source producing emf
ε = ε0 [cos(100 π s–1)t + cos(500 π s–1)t]
is connected in series with a capacitor and a resistor. The steady-state current in the circuit is found to be
i = i1 cos [(100 π s–1)t +ϕ1] i2 cos[(500 π s–1)t + φ2]

1.  i1 > i2 

2.  i1 = i2 

3.  i1 < i2

4.  the information is insufficient to find the relation between i1 and i2

Subtopic:  Different Types of AC Circuits |
From NCERT
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The peak voltage in a 220 V AC source is

1.  220 V

2.  about 160 V

3.  about 310 V

4.  440 V

Subtopic:  RMS & Average Values |
 75%
From NCERT
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An AC source is rated \(220~\mathrm{V}\), \(50~\mathrm{Hz}\). The average voltage is calculated in a time interval of \(0.01~\mathrm{s}\). It,

1. must be zero
2. may be zero
3. is never zero
4. is \(220\sqrt{2}\) V

Subtopic:  RMS & Average Values |
 53%
From NCERT
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Which of the following plots may represent the reactance of a series LC combination?
                      
Correct option:

1.  a

2.  b

3.  c

4.  d
Subtopic:  Different Types of AC Circuits |
 51%
From NCERT
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A series AC circuit has a resistance of 4  Ω and a reactance of 3. Ω. The impedance of the circuit is

1.  5 Ω

2.  7 Ω

3.  12/7 Ω

4.  7/12 Ω

Subtopic:  Different Types of AC Circuits |
 88%
From NCERT
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Transformers are used

1.  in DC circuits only

2.  in AC circuits only

3.  in both DC and AC circuits

4.  neither in DC nor in AC circuits

Subtopic:  Transformer |
 81%
From NCERT
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An alternating current is given by 
\(i=i_1 \cos \omega t+i_2 \sin \omega t\)
The rms current is given by:

1.    \(\frac{i_{1}+i_{2}}{\sqrt{2}}\)

2.  \(\frac{\left|i_{1}-i_{2}\right|}{\sqrt{2}}\)

3.   \(\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{2}}\)

4.  \(\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{\sqrt{2}}}\)

Subtopic:  RMS & Average Values |
 84%
From NCERT
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An alternating current having peak value \(14\) A is used to heat a metal wire. To produce the same heating effect, a constant current \(i\) can be used, where \(i\) is:
1. \(14\) A
2. about \(20\) A
3. \(7\) A
4. about \(10\) A

Subtopic:  Power factor |
 65%
From NCERT
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A constant current of 2.8 A exists in a resistor. The RMS current is

1.  2.8 A

2.  about 2 A

3.  1.4 A

4.  undefined for a direct current

Subtopic:  RMS & Average Values |
 52%
From NCERT
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