12th Class Physics Chapter 16 Alternating Current Preparation Online Test

Physics FSC Part 2 Chapter 16 Online MCQ's Test

Sr. #	Questions	Answers Choice
1	In AC system we generate sine wave form because:	It san be easily draw It produces least disturbance in electrical circuits It is nature standard Other waves cannot be produced easily
2	In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?	4 times 1/4 times 8 times 2 times
3	In chopke coil the resistance X_L an resistance R are:	X<sub>L</sub>=R X<sub>L</sub><<R X<sub>L</sub>>>R X<sub>L</sub>=<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">∞</span>
4	The peak value of alternating current is 5√2 A. The mean square value of current will be:	5A 2.5A 5<b style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">√2A</b> 5<sup>2</sup>
5	The peak value of alternating current is 5√2 A. The mean square value of current will be:	5A 2.5A 5<b style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">√2A</b> 5<sup>2</sup>
6	A capacitor is perfectly insulator for:	Direct current Alternating current Direct as well as alternating current None of these
7	The AC system is preferred to DC system because:	AC voltage can be easily changed in magnitude DC motor angular velocity is affected badly High voltage AC transmission is less efficient Domestic appliance require AC voltage for their operation
8	In Series resonance circuit the impedance of circuit art resonance frequency, is	Maximum Minimum It is unequal to R None of above
9	The resonance frequency is given by:	fr = 2π√LC fr = 1/2πLC fr = 1/ 2π√LC f1 = 1/ 2πC√L
10	The condition of resonance is:	XL = 1/2 Xc X<sub>L</sub> = X<sub>c</sub> X<sub>c</sub> = 4<sub>x2</sub> None of above
11	Power dissipation in A.C circuit is expressed as:	P =I<sub>rms</sub> x V<sub>rms</sub> Sinθ IxVCosθ I<sub>rms</sub>xV<sub>rms</sub>Cosθ I<sub>rms</sub> x V<sub>rms</sub> Sin2θ
12	Power dissipation is a pure inductive or in a pure capacitance circuit is:	10<sup>6</sup> 0 10<sup>∘</sup> Maximum
13	Unit of impedance is:	Ohm Ohm<sup>-1</sup> no unit Ohm m<sup>-1</sup>
14	Impedance is denoted by:	A  Z P Q
15	The combined effect of resistance and reactance in circuit is called:	Impedance Inductance Capacitance None of above
16	X_L=	2πfL 1/2πfL 2πfL fL/2π
17	In A.C circuit of inductor which one is true	Voltage leads current by phase angle π/2 Voltage lags current by π/2 Current leads voltage by π/2 Both remain in phase

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