ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

The basic circuit element in A.C. circuits are:

Question # 2

The output voltage of half wave rectification is in the form of

Question # 3

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 4

The value of output resistance of OP-AMOP is of the order of

Question # 5

The phase at the positive peak of an A.C. cycle is:

Question # 6

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 7

The value of current gain of n-p-n transistor is of the order of

Question # 8

Which of the following diodes can operate in the reverse biased condition

Question # 9

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 10

During the negative half-cycle of the half-wave rectification, the diode

Question # 11

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 12

During each cycle, alternating voltage reaches a peak value

Question # 13

For normal operation of transistor, the batteries

Question # 14

The power factor of resonant series circuit is

Question # 15

A signal is amplified at the output without any change of phase, if it is applied at the

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
2 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
3 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF
4 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
5 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
6 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
7 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
8 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
9 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
10 The highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value

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  • Iiqra Fatima

    Iiqra Fatima

    25 May 2018

    You should let us practice difficult mcqs ..These are too easy for ECAT level....Thanku

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