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This mock test of Alternating Current MSQ for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Alternating Current MSQ (mcq) to study with solutions a complete question bank.
The solved questions answers in this Alternating Current MSQ quiz give you a good mix of easy questions and tough questions. Physics
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*Multiple options can be correct

QUESTION: 1

A choke coil of resistance **5ω** and inductance **0.6 H** is in series with a capacitance of

Solution:

The frequency

The current at resonance is

The correct answers are: **I _{0} = 40A** ,

*Multiple options can be correct

QUESTION: 2

An alternating *emf* of angular frequency is applied to a series *LCR* circuit. For this frequency of the applied *emf*, which of the following is not true.

Solution:

(ε = ε_{0 }sinωt)

As we know resonating angular frequency is

so circuit is in resonance and impedence is made up of only resistance part

The correct answers are: The circuit is at *resonanc**e* and its impedance is made up only of a reactive part, The sum of the potential differences across the inductance and capacitance equals the applied *emf* which is 180° ahead of phase of the current in the circuit, Impedance of the circuit is less than **R**

*Multiple options can be correct

QUESTION: 3

The value of current in two series *LCR* circuits at resonance is same when connected across a sinusoidal voltage source. Then which of the following is incorrect :

Solution:

The correct answers are: both circuits must be having same value of capacitance and inductor, in both circuits ratio of * L* and

*Multiple options can be correct

QUESTION: 4

Graph shows variation of source *emf* * V* and

Solution:

It is apparent from the graph that *emf* attains its maximum value before the current does, therefore current lags behind emf in the circuit. Nature of the circuit is inductive.

Value of power factor cos φ increases by either by decreasing * L *or by increasing

The correct answers are: The circuit is more inductive than capacitive., To increase the rate at which energy is transferred to the resistive load, * L* should be decreased.

*Multiple options can be correct

QUESTION: 5

In the circuit shown, resistance ** R = 100Ω**, inductance L = 2H/π and capacitance C = 8μF/π are connected in series with an

Solution:

= 2*A
*

= 1000 volt

The correct answers are:

*Multiple options can be correct

QUESTION: 6

In an **ac** circuit shown below in figure the supply, voltage has a constant *rms* value * V* but variable frequency

Solution:

When *L* and *C* are in series, voltage across capacitor and inductor is 180º out of phase.

The correct answers are: has current given by I = V/R has a voltage across the capacitor which is 180° out of phase with that across the inductor

*Multiple options can be correct

QUESTION: 7

Resonance occurs in a series *LCR* circuit when the frequency of the applied *emf* is 1000*Hz*.

Solution:

(*f* = 900 *Hz*) < (*f*_{res} = 1000 *Hz*), so *X _{C}* >

At resistance, impedance in minimum.

Not only at resonance, but at all conditions voltage across

The correct answers are: when ** f = 900Hz**, then the current through the voltage source will be ahead of

*Multiple options can be correct

QUESTION: 8

In the given * ac* circuit, which of the following is incorrect :

Solution:

Since the circuit is at resonance so current in the circuit is in the phase with applied voltage. Voltage across inductro leads the current by π/2 and across a capacitor lag by π/2. So the voltage across resistance is lagging by 90^{∘} than the voltage across capacitor.

*Multiple options can be correct

QUESTION: 9

Which of the following statements is TRUE? Heat produced in a current carrying conductor depends upon :

Solution:

1) DC current will travel through the entirety of the wire -- AC current will tend to move on the outside of the conductor (see Skin Effect). This will cause slightly more ohmic heating in AC than in DC. That's why AC wire is usually stranded while DC wire is usually solid -- more strands = more surface area.

the time for which the current flows in the conductor, the resistance of the conductor, the strength of the current.

*Multiple options can be correct

QUESTION: 10

In an RLC series circuit shown in figure the reading of voltmeters V_{1} and V_{2} are 100V and 120V, respectively. The source voltage is 130V. For this situation, mark out the correct statement(s).

Solution:

Since V_{C} < V_{L}, so circuit is capacitive

The correct answers are: Voltage across resistor, inductor and capacitor are and respectively, Power factor of the circuit is 5/13, The circuit is capacitive in nature

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