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This mock test of Alternating Current NAT Level - 2 for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Alternating Current NAT Level - 2 (mcq) to study with solutions a complete question bank.
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*Answer can only contain numeric values

QUESTION: 1

In an AC circuit the potential differences across an inductance and resistance joined in series are respectively 16V and 20V. The total potential difference across the circuit is X/5. Then *X* is :

Solution:

The correct answer is: 128

*Answer can only contain numeric values

QUESTION: 2

A *LCR* series circuit with 100Ω resistance is connected to an *AC* source of 200*V* and angular frequency 300 *radians per second*. When only the capacitance is removed, the current lags behind the voltage by 60°. When only the inductance is removed, the current leads the voltage by 60°. Calculate the average power dissipated in *LCR* circuit in watts.

Solution:

Impedance of circuit = *R
*

The correct answer is: 200

*Answer can only contain numeric values

QUESTION: 3

An inductor (X_{L} = 2Ω) a capacitor (X_{C }= 8Ω) and a resistance 8Ω are connected in series with an AC source. The voltage output of AC source is given by V = cos100πt, then the impedance of the circuit (in Ω).

Solution:

The correct answer is: 10

*Answer can only contain numeric values

QUESTION: 4

A *LCR *series, *AC* circuit operates at half its resonant frequency and at a power factor of **0.8**. Then the ratio of

Solution:

resonant frequency

The correct answer is: 1

*Answer can only contain numeric values

QUESTION: 5

In the *LCR* circuit shown if only * L* is removed, the current leads the supply voltage by 30°. If only

Solution:

The correct answer is: 3

*Answer can only contain numeric values

QUESTION: 6

The voltage time **( V-t)** graph for triangular wave having peak value

Solution:

⇒

The correct answer is: 3

*Answer can only contain numeric values

QUESTION: 7

The average value of current i = I_{m} sin ωt from t = π/2ω to t = 3π/2ω is how many times of I_{m} ?

Solution:

The correct answer is: 0

*Answer can only contain numeric values

QUESTION: 8

In the circuit diagram shown, *X _{C }*= 100Ω,

Solution:

The correct answer is: 8

*Answer can only contain numeric values

QUESTION: 9

Find the average value of current from t = 0 to t = 2π/ω, if the current varies as i = I_{m}sinωt.

Solution:

It can be seen graphically that the area of *i* = *t* graph of one cycle is zero.

∴ is one cycle.

The correct answer is: 0

*Answer can only contain numeric values

QUESTION: 10

An inductor (X_{L} = 2Ω), a capacitor (X_{C} = 8Ω) and a resistance 8Ω are connected in series with an AC source. The instantaneous potential difference between A and B when it is half of the voltage output from source at that instant is x/5 volt, then x is.

Solution:

The current leads in phase by

The instantaneous potential difference across *AB* is

The instantaneous potential difference across *AB* is half of source voltage.

The correct answer is: 24

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