Alternating Current Test

Result

Alternating Current Test - 41

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Question 1
4 / -1

A fully charged capacitor C with initial charge q₀, is connected to a coil of self inductanceL at t = 0. The time at which the energy is stored equally between theelectric and the magnetic fields is

A

B

C

D

Solution
Question 2
4 / -1

An ac voltage source of variable angular frequency ω and fixed amplitude V connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased

A
The bulb glows dimmer

B
The bulb glows brighter

C
Total impedence of the circuit is unchanged

D
Total impedence of the circuit increases

Solution
Question 3
4 / -1

In the circuit shown in figure neglecting source resistance the voltmeter and ammeter reading will respectively be

A
0 V, 3A

B
150 V, 3A

C
150 V, 6A

D
0 V, 8 A

Solution
Question 4
4 / -1

In the circuit shown in the figure, the ac source gives a voltage V = 20 cos (2000 t). Neglecting source resistance, the voltmeter and ammeter reading will be

A
0 V, 0.47A

B
1.68 V, 0.47A

C
0 V, 1.4 A

D
5.64 V, 1.4 A

Solution
Question 5
4 / -1

The reading of ammeter in the circuit shown will be

A
2A

B
2.4 A

C
zero

D
1.7 A

Solution
Question 6
4 / -1

Is it possible

A
Yes

B
No

C
Cannot be predicted

D
Insufficient data to reply

Solution
Question 7
4 / -1

Which of the following curves represents the variation of impedance (Z) with frequency f in series LCR circuit

A

B

C

D

Solution
Question 8
4 / -1

The variation of the instantaneous current (I) and the instantaneous e.m.f. (E) in a circuit is as shows in fig.
Which of the following statement is correct

A
The voltage lags behind the current by π/2

B
The voltage leads the current by π /2

C
The voltage and the current are in phase

D
The voltage leads the current by π

Solution
Question 9
4 / -1

An alternating e.m.f is applied across a parallel combination of a resistance R, capacitance C and an inductance L. If I_R, I_L, I_C are the currents through R, L and C respectively, then the diagram which correctly represents the phase relationship among I_R, I_L, I_C and source e.m.f. E, is given by

A

B

C

D

Solution
Question 10
4 / -1

An ac source of variable frequency f is connected to an LCR series circuit. Which of the graphs in figure represents the variation of current I in the circuit with frequency f

A

B

C

D

Solution