# The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit are shown in the figure. Which of the following statements is correct? 1. The voltage lags behind the current by π/2. 2. The voltage leads the current by π/2. 3. The voltage and the current are in phase. 4. The voltage leads the current by π.

Subtopic:  RMS & Average Values |
79%
From NCERT
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A constant voltage at different frequencies is applied across a capacitance C as shown in the figure.

Which of the following graphs accurately illustrates how current varies with frequency?

 1 2 3 4
Subtopic:  Different Types of AC Circuits |
59%
From NCERT
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The output current versus time curve of a rectifier is shown in the figure. The average value of the output current in this case will be:

 1 0 2 $$I_0 \over 2$$ 3 $$2I_0 \over \pi$$ 4 $$I_0$$
Subtopic:  RMS & Average Values |
66%
From NCERT
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When an ac source of e.m.f. $e={E}_{0}\mathrm{sin}\left(100$ $t\right)$ is connected across a circuit, the phase difference between the e.m.f. e and the current i in the circuit is observed to be $$\frac{\pi}{4}$$ as shown in the diagram. If the circuit consists only of RC or LC in series, then what is the relationship between the two elements?

 1 $$R=1 k \Omega, C=10 \mu F$$ 2 $$R=1 k \Omega, C=1 \mu F$$ 3 $$R=1 k \Omega, L=10 \ H$$ 4 $$R=1 k \Omega, L=1 \ H$$

Subtopic:  Different Types of AC Circuits |
54%
From NCERT
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In the diagram, two sinusoidal voltages of the same frequency are shown. What is the frequency and the phase relationship between the voltages?

 Frequency in Hz Phase lead of $$N$$ over $$M$$ in radians 1. $$0.4$$ $$-\pi/4$$ 2. $$2.5$$ $$-\pi/2$$ 3. $$2.5$$ $$+\pi/2$$ 4. $$2.5$$ $$-\pi/4$$
Subtopic:  AC vs DC |
67%
From NCERT
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Which of the following plots may represent the reactance of a series of LC combinations?

1. a

2. b

3. c

4. d

Subtopic:  Different Types of AC Circuits |
From NCERT
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In an ac circuit $$I=100~sin~200~ \pi t.$$ The time required for the current to reach its peak value will be:

 1 $$\frac{1}{100}~sec$$ 2 $$\frac{1}{200}~sec$$ 3 $$\frac{1}{300}~sec$$ 4 $$\frac{1}{400}~sec$$
Subtopic:  RMS & Average Values |
65%
From NCERT
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The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. What is the power factor of this circuit?

1. 0.4

2. 0.5

3. 0.8

4. 1.0

Subtopic:  Power factor |
81%
From NCERT
NEET - 2016
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A coil of self-inductance L is connected in series with a bulb B and an AC source. The brightness of the bulb decreases when:

 1 Frequency of the AC source is decreased 2 The number of turns in the coil is reduced 3 A capacitance of reactance Xc=XL is included in the same circuit 4 An iron rod is inserted in the coil
Subtopic:  Different Types of AC Circuits |
69%
From NCERT
NEET - 2013
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An $$AC$$ voltage is applied to a resistance $$R$$ and an inductor $$L$$ in series. If $$R$$ and the inductive reactance are both equal to $$3~ \Omega,$$ then the phase difference between the applied voltage and the current in the circuit will be:

 1 $$\pi / 4$$ 2 $$\pi / 2$$ 3 zero 4 $$\pi / 6$$
Subtopic:  Different Types of AC Circuits |
73%
From NCERT
NEET - 2011
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