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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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 |
50%
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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An inductor, a resistor and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance,

 a. of the inductor increases. b. of the resistor increases. c. of the capacitor increases. d. of the circuit increases.

Choose the correct option:
1. (a) only
2. (b), (c)
3. (c), (d)
4. (a), (d)

Subtopic:  Different Types of AC Circuits |
62%
From NCERT
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The reactance of a circuit connected to an AC circuit is zero. It is possible that the circuit contains

(a) an inductor and a capacitor
(b) an inductor but no capacitor
(c) a capacitor but no inductor
(d) neither an inductor nor a capacitor

Choose the correct option

1.  (a) only

2. (b), (c)

3. (c), (d)

4. (a), (d)

Subtopic:  Different Types of AC Circuits |
56%
From NCERT
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In an AC series circuit, the instantaneous current is zero when the instantaneous voltage is maximum. Connected to the source may be a:

 (a) pure inductor. (b) pure capacitor. (c) pure resistor. (d) combination of an inductor and a capacitor.

Choose the correct option:

 1 (a), (b), (d) 2 (b), (c), (a) 3 (c), (d), (a) 4 (a), (d), (c), (b)

Subtopic:  Different Types of AC Circuits |
71%
From NCERT
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