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 | –π/4 |
2. | 2.5 | –π/2 |
3. | 2.5 | +π/2 |
4. | 2.5 | –π/4 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following plots may represent the reactance of a series of LC combinations?
1. a
2. b
3. c
4. d
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn an ac circuit I= 100 sin 200 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. \(\frac{1}{400}~sec\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn AC voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to , then the phase difference between the applied voltage and the current in the circuit will be:
1.
2.
3. zero
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen an ac source of e.m.f. 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.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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.
3.
4. I0
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology