PHYSICS 2nd Year MCQs Chapter No.5 ALTERNATING CURRENT Online MDCAT Exams Preparation Test No.2

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Chapter Name : Alternating Current 
Chapter No. 5  [Test No.2]
2nd Year
Multiple Choice Questions


Book Name :  PHYSICS
Chapter No. 5 (Test No.2)
Chapter Name : Alternating Current 
Total MCQ from Text Book :  100
Book Version  :

Published By : Punjab Text Book Board Lahore
Approved By : Govt of the Punjab and Federal Ministry for Education
Test Type : MCQ’s
Exam conduct By : Inter Boards of Sindh, KPK, Balochistan, AJK, Gilgit Baltistan, Punjab & Federal
Class / Grade  : 12 ( F.Sc. Intermediate)
Total Marks : 100
Total Time :   100 minutes



1 / 100

A device that allows only the continuous flow of A.C. through a circuit is

2 / 100

The inductive reactance of the coil is given by the expression

3 / 100

A device that allows only the continuous flow of an A.C. through a circuit is

4 / 100

In a three phase A.C. generator, there are three coils inclined at

5 / 100

If Vo is thee value of A.C. voltage its rms value is

6 / 100

The P-P value of AC voltage wave form is

7 / 100

The SI unit of inductance is

8 / 100

Which of the following waves are more energetic

9 / 100

In RLC series circuit, the current at resonance frequency is

10 / 100

In capacitive circuit, at high frequency, the current will he

11 / 100

In RLC series circuit, the impedance of the circuit at resonance is

12 / 100

In the equation P = IV cos 0, cos 0 is called

13 / 100

In three phase A.C. generator, the voltage between any line and the neutral line is

14 / 100

In free space, the speed of electromagnetic waves is

15 / 100

In capacitor circuit, at low frequency, the current will be

16 / 100

In a L-C parallel circuit at the resonance condition the current and applied voltage are

17 / 100

At low frequency of the alternating current, the current will be

18 / 100

The inductive reactance is directly proportional to

19 / 100

The inductance and capacitance behave as a function of

20 / 100

In capacitive circuit, at high frequency, the reactance will be

21 / 100

A sinusoidal current has rms (effective) value of 10A. Its maximum value is

22 / 100

The examples of electromagnetic waves are

23 / 100

The ratio of the rms value Of the applied voltage to the rms value of A.C. is called

24 / 100

Which of the following has smallest wavelength?

25 / 100

The waves which do not require any material medium for their propagation are called

26 / 100

The phase at the negative peak of A.0 is

27 / 100

The flow of D.C. is blocked by

28 / 100

The value of resonance frequency f1 in case of series resonance circuit is given by

29 / 100

In RLC series circuit, at high frequency

30 / 100

An incandescent lamp will reach its maximum brilliance ________time per second when connected to a 220V,50Hz source

31 / 100

Electromagnetic waves were discovered by

32 / 100

The power dissipated in a pure inductive or capacitance, circuit is

33 / 100

The combined effect of resistance and reactance in an AC circuit is called

34 / 100

As A.C. continuously flows through the plates of a capacitor because of

35 / 100

The expression P = VI is true in case of A.C. circuit when

36 / 100

In a capacitive A.C. circuit the charge q and applied voltage V are

37 / 100

In pure resistive A.C. circuit the instantaneous values of voltage and current are

38 / 100

The phase angle between the voltage and current in resistive A.C. circuit is

39 / 100

In RLC series circuit, at resonance condition the voltage and current are

40 / 100

In a pure capacitor A.C. circuit, the current and the applied voltage are

41 / 100

Alternating current is that which is produced by a voltage source whose polarity

42 / 100

The averagelueiof alternating current or voltage over a complete cycle is

43 / 100

A changing magnetic field creates a

44 / 100

Electromagnetic waves consists of

45 / 100

The main reason far the world-wide use of A.C. is that it can be transmitted to

46 / 100

The opposition offered by a capacitor to the flow of A.C. is called-its

47 / 100

For practice L-C parallel circuit the current at resonance frequency is

48 / 100

Metals detectors arc made by the combination of

49 / 100

A choke is a coil having

50 / 100

The behavior of resistance is independent of

51 / 100

Ohm is the unit of

52 / 100

Which of the following EMW has the longest wavelength?

53 / 100

The graph between alternating voltage and time is a

54 / 100

An A.C. varies as a function of

55 / 100

In the resonance condition of RLC series circuit the power factor is

56 / 100

At low frequency of the alternating current, the inductive reactance XL

57 / 100

In an A.C. circuit with pure capacitor only, the current

58 / 100

If we connect an ordinary D.C. ammeter to measure alternating current, it Would measure its

59 / 100

The average of square value of alternating current or voltage over a complete cycle is:

60 / 100

The capacitance required to construct a resonance circuit of frequency 1000 KHz with an inductor of 5mH is

61 / 100

The capacitance required to construct a resonance circuit of frequency 1000 KHz with an inductor of 5mH is

62 / 100

The output voltage of n A.C. generator at time t = T/2 is given by

63 / 100

As frequency of AC increases

64 / 100

Electromagnetic waves emitted from an antenna arc

65 / 100

In a pure inductor coil the power dissipated is

66 / 100

At resonance frequency, the impedance of RLC series circuit is

67 / 100

The frequency at which an inductor of 1.0 H have a reactance of 500 ?

68 / 100

The most common source of an A.C. voltage is

69 / 100

SI unit of impedance is

70 / 100

The frequency for 2 henry inductor having reactance of 1000? is

71 / 100

The A.C. circuit in which current and voltage are in phase, the power factor is

72 / 100

In a R-L series circuit, the current

73 / 100

In L-C parallel circuit at resonance condition the power factor is

74 / 100

The opposition offered by the inductor to the flow of A.C. is called

75 / 100

In L-C parallel circuit the capacitor draws a

76 / 100

Capacitor of 2000 μF is connected across alternating source of 20 volts. If frequency of the source is 50/? 117 Hz then reactance of the capacitor is:

77 / 100

The power dissipated in resistive circuit is

78 / 100

Current in a dry-cell is an example of

79 / 100

For a practical L-C parallel circuit at the resonance frequency the circuit impedance is

80 / 100

Maxwell's equation were discovered by .James Clark Maxwell in.

81 / 100

The electric field and magnetic field and the direction of propagation of electromagnetic waves are mutually

82 / 100

A three phase A.C. generator, if the first coil has phase 0, then the other two coils will have phases

83 / 100

A resonance curve for RLC circuit is a plot of frequency versus

84 / 100

In free space, the radio waves travel with a speed

85 / 100

A radio transmitting antenna provides a good example of generating

86 / 100

A choke coil is used to limit current in

87 / 100

The basic circuit element in a D.C. circuit which controls the current or voltage is a

88 / 100

In a three phase A.C, generator, the phase difference between each pair of coil is equal to

89 / 100

Which one Of the following waves are not electromagnetic waves?

90 / 100

Choke consumes extremely small

91 / 100

The current which keeps on reversing its direction (or polarity) with lime is called

92 / 100

The highest value reached, by A.C. voltage or current in one cycle is called

93 / 100

The output voltage of an A.C. generator at time t = T/4 is given by

94 / 100

The expression P = VI holds only when current and voltage are

95 / 100

Voltage across any two lines of a three phase A.C. supply is about

96 / 100

In the RLC parallel circuit, the resonance frequency is

97 / 100

The unit of reactance is Xc of a a capacitor joined across alternating source can be found by the relation

98 / 100

In a R-C series circuit, the current

99 / 100

If Io is the peak value of A.C. current, itsaverage value over the complete cycle is:

100 / 100

In a pure capacitor A.C. circuit, the current I anti charge q are

Your score is

The average score is 0%


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