PHYSICS 2nd Year MCQs Chapter No.5 ALTERNATING CURRENT Online MDCAT & ECAT Preparation Test No.1

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Chapter Name : Alternating Current 
Chapter No. 5  [Test No.1]
2nd Year
Multiple Choice Questions


Book Name :  PHYSICS
Chapter No. 5 (Test No.1)
Chapter Name : Alternating Current 
Total MCQ from Text Book :  99
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 : 99
Total Time :   99 minutes



1 / 99

The reactance of a capacitor at 50Hz is 10 Ohm Which of the following will be its reactance at 100 Hz?

2 / 99

For frequency modulated signal, the frequency of the modulated carrier wave is at its normal value when the signal amplitude is at its

3 / 99

High frequency radio wave is called as:-.

4 / 99

Electromagnetic waves are, generated when

5 / 99

AC can be converted into DC by:

6 / 99

In the modulation process, low, frequency signal is called

7 / 99

Which of the following radiations forms the part of electromagnetic spectrum?

8 / 99

When electrons in a transmitting antenna vibrate 94000 times each having frequency:

9 / 99

The power factor of an A.C circuit has.

10 / 99

In pure RLC circuit, the energy is dissipated in:

11 / 99

The phase difference between current and voltage in an Inductive circuit is

12 / 99

The sum of positive and negative peak value is called

13 / 99

In three phase A.C supply coils are inclined at an angle of

14 / 99

The peak value of A.C is 2?2 A Which of the following will be its apparent value?

15 / 99

The frequency modulation (F.M.) transmission, frequencies range from

16 / 99

The sum of positive and negative peak values is called:

17 / 99

The amplitude modulated transmission waves have frequencies range:

18 / 99

Electromagnetic waves emitted from radio antenna are:

19 / 99

The phase angle between the voltage and current through resistor is:

20 / 99

Phase difference between V and I of an A. C through resistor is

21 / 99

At resonance frequency, the impedance of RLC series circuit is:

22 / 99

The effective value of A.C in a circuit is 10A Which of the following will be its peak value.

23 / 99

For frequency modulated signal, the frequency of the modulated carrier wave is highest when the signal amplitude is at its

24 / 99

AC voltmeter measure

25 / 99

The reactance of an inductor is

26 / 99

The phase angle at +vc (positive) peak is

27 / 99

Dimensions of RC matches with

28 / 99

The frequency of the range 20 to.20,000 Iii is:

29 / 99

In alternating current, Inductors behave like

30 / 99

Waves we prefer for transmission of radio signals have

31 / 99

100 μf capacitor is connected to an AC-voltage of 24 V and frequency of 50 Hz. The reactance of the capacitor is

32 / 99

In R-L series circuit phase angle is given by

33 / 99

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

34 / 99

The frequency of AC in Pakistan is;

35 / 99

The impedance. Of RLC series circuit at, resonance is equal to;

36 / 99

Power factor is equal to:

37 / 99

In our radio receiver set, when we change station, or change the frequency we actually adjust the :due of

38 / 99

The flow of D.C. current is opposed by

39 / 99

The power factor in wattles current is

40 / 99

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance's is:

41 / 99

Choke consumes extremely small:

42 / 99

The frequency of electromagnetic waves received through a LC - circuit is adjusted by

43 / 99

Impedance Z can he expressed as;

44 / 99

The amplitude modulation (A.M.) transmission, frequencies range from

45 / 99

A.C. through inductor, the applied voltage:

46 / 99

Power dissipated in pure inductor is:

47 / 99

The wire receiving the waves is known as

48 / 99

The range or F.M transmission frequencies is from

49 / 99

The frequency range. for F.M is given by

50 / 99

For frequency modulated signal, the frequency of the modulated carrier wave is lowest when the signal amplitude is at its

51 / 99

The velocity of an oscillating charge as it moves to and fro along the wire is

52 / 99

The piece of wire through which charges are made to accelerate by mean o me waves is known as

53 / 99

The combined effect of resistance and reactance is known as:

54 / 99

The speed of electromagnetic wave in vacuum is given by

55 / 99

During each cycle AC voltage reaches a peak value

56 / 99

In RLC parallel circuit the resonance frequency is

57 / 99

In the modulation process, high frequency signal is called

58 / 99

If E and B be electric and magnetic field vectors of an electromagnetic wave, Then propagation of wave then propagation of wave is along the direction of

59 / 99

Electromagnetic waves transport

60 / 99

In RIC series circuit Xl=Xc Which of the following will be the power factor?

61 / 99

The velocity of an oscillating charge as it moves to and fro along a wire is:

62 / 99

The power factor of RL-series circuit is :

63 / 99

In an electromagnetic waves, the electric and magnetic field are:

64 / 99

In tuning circuit if capacitance is doubled and inductance is halved then its frequency

65 / 99

Choke coil in A.C circuit is used for

66 / 99

Which of the following is the time taken by an A.C of frequency 50 Hz to complete one cycle?

67 / 99

The highest value reached by the Voltage or current in one cycle is called;

68 / 99

The range of values of power factor is

69 / 99

When we accelerate the charges, which type of waves are produced.

70 / 99

The basic circuit element in a D.0 circuit which controls the current and voltage is

71 / 99

Electromagnetic waves do not transport any:

72 / 99

At high frequency the value of reactance of capacitor will he

73 / 99

Which of the following electromagnetic waves have shortest wavelength?

74 / 99

Main reasons for worldwide use of A. C is

75 / 99

In R-L-C Circuit, the energy is dissipated in:

76 / 99

The frequency of A.C. source used in Pakistan is;

77 / 99

The waveform of alternating voltage is a:

78 / 99

Modulation can be achieved by

79 / 99

The process of combining the low frequency signal with a high frequency signal is called

80 / 99

Capacitive reactance Xc =

81 / 99

In a pure inductive A.C. circuit the current

82 / 99

Which one is not present in AC generator?

83 / 99

In three phase AC generator the phase difference between each pair of coil is:

84 / 99

The peak value of A.C source is 20 A, then its rrms value will be:

85 / 99

An electric bulb is designed to operate at 12V DC. It is connected to AC and gives same brightness then peak AC value of voltage is

86 / 99

The sharpness of resonance RLC series resonant circuit, as the resistance of the circuit is increased,

87 / 99

Average value of current and voltage over a complete cycle is

88 / 99

Direct current cannot flow through:

89 / 99

The mean value of A.C. in a cycle is :

90 / 99

The slope of q-t curve at any instant of time gives:

91 / 99

AN inductor may store energy in:

92 / 99

At resonance frequency, the impedance of RLC - Parallel Circuit is

93 / 99

The reactance Of capacitor is equal to

94 / 99

As a result of modulation, the resulting wave is called

95 / 99

The most common source of A.C is:

96 / 99

In case of capacitor, the unit of reactance is:

97 / 99

In Pakistan, the frequency of A.C. supply is :

98 / 99

Direct current cannot flow through

99 / 99

Choke used to limit high frequency A.C has

Your score is

The average score is 26%


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