Alternating Current MCQ for Class 12 | Alternating Current JEE and NEET MCQ

Alternating Current MCQ for Class 12,

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Alternating Current MCQ for Class 12

Here In this Post we are providing you Some Important Questions related to Alternating Current of 12th Class which can be asked in NEET and JEE Examination. If you are Preparing for NEET and JEE Exam, then you must Practice this Alternating Current MCQ for Class 12.

Alternating Current MCQ for Class 12 – Alternating Current NEET and JEE Mock Test

1. Which of the following combination should be selected for better turning of an L.C.R circuit used for communication?

(a) R 250, L 15H, C = 45µF

(b) R = 250, L = 1.5H, C = 35µF

(c) R=250, L = 2.5H, C = 45µF

(d) R 150, L3.5H, C = 30µF

2. The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is:

(a) 0.4

(b) 0.5

(c) 0.8

(d) 1.0

3. A small signal voltage V(t)=V0​   sinωt is applied across an ideal capacitor C. Then:

(a) current I(t) is in phase with voltage V (t)

(b) current I(t) leads voltage V (t) by 180°

(c) current I(t), lags voltage V (t) by 90°

(d) over a full cycle the capacitor C does not consume any energy from the voltage source

4. A series R-C circuit is connected to an alternating voltage source. Consider two situation:
(a) When capacitor is filled
(b) When capacitor is mica filled
Current through resister is i and voltage across capacitor is V then :

(a) Va = Vb

(b) Va < Vb

(c) Va > Vb

(d) ia = ib

7. An ac voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3Ω, the phase difference between the applied voltage and the current in the circuit is

8. A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source of 200 volt, 100 Hz is connected across the coil, the current in the coil will be :

(a) 2.0 A

(b) 4.0 A

(c) 8.0 A

(d)  A

10. For a series LCR circuit, the power loss at resonance is :

(a)                                             (b) Lw

(c) R                                      (d)

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ANSWER KEY

1.Ans D

2.Ans C

3.Ans D

4.Ans C

5.Ans B

6.Ans B

7.Ans C