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 |
52%
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 |
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 |
80%
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 |
83%
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 |
51%
From NCERT
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