Alternating current cannot be measured by a D.C. ammeter because:
1. A.C. can not pass through D.C. Ammeter
2. A. C. changes direction
3. Average value of current for complete cycle is zero
4. D.C. Ammeter will get damaged
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn an L-R circuit, the inductive reactance is equal to the resistance R of the circuit. An emf of E = E0cos(ωt) is applied to the circuit. The power consumed by the circuit is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA series AC circuit has a resistance of 4 and an inductor of reactance 3 . The impedance of the circuit is z1. Now when a capacitor of reactance 6 is connected in series with the above combination, the impedance becomes will be:
1. 1 : 1
2. 5 : 4
3. 4 : 5
4. 2 : 1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn inductor (L) and resistance (R) are connected in series with an AC source. The phase difference between voltage (V) and current (i) is . If the phase difference between V and i remains the same, then the capacitive reactance and impedance of the L-C-R circuit will be:
1. 2R, R
2. R, R
3. R, R
4. 2R, R
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is the value of inductance L for which the current is a maximum in a series LCR circuit with C=10 μF and = 1000 s-1 ?
1. 10 mH
2. 100 mH
3. 1 mH
4. cannot be calculated unless R is known
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
In an ideal parallel LC circuit, the capacitor is charged by connecting it to a dc source which is then disconnected. The current in the circuit will:
1. become zero instantaneously.
2. grow monotonically.
3. decay monotonically.
4. oscillate instantaneously.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 50 Hz a.c. source of 20 volts is connected across R and C as shown in the figure below.
If the voltage across R is 12 volts, then the voltage across C will be:
1. 8 V
2. 16 V
3. 10 V
4. not possible to determine unless values of R and C
are given
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA transformer has an efficiency of 90% when working on a 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil, respectively, are:
1. 300 V, 15 A
2. 450 V, 15 A
3. 450 V, 13.5 A
4. 600 V, 15 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe core of a transformer is laminated because:
1. | energy losses due to eddy currents may be minimized |
2. | the weight of the transformer may be reduced |
3. | rusting of the core may be prevented |
4. | ratio of voltage in primary and secondary may be increased |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
How much power is dissipated in an L-C-R series circuit connected to an AC source of emf E?
1. \(\frac{\varepsilon^{2} R}{\left[R^{2}+\left(L \omega-\frac{1}{C \omega}\right)^{2}\right]}\)
2. \(\frac{\varepsilon^{2} \sqrt{R^{2}+\left(L \omega-\frac{1}{C \omega}\right)^{2}}}{R}\)
3. \(\frac{\varepsilon^{2}\left[R^{2}+\left(L \omega-\frac{1}{C \omega}\right)^{2}\right]}{R}\)
4. \(\frac{\varepsilon^{2}R}{\sqrt{R^{2}+\left(L \omega-\frac{1}{C \omega}\right)^{2}}}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology