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

In n-p-n transistor, emitter base junction is kept

Question # 2

The amplifier which us used to perform mathematical operations electronically is known as

Question # 3

Peak value of alternative current is:

Question # 4

In free space, the speed of electromagnetic waves is

Question # 5

At resonance frequency the impedance of parallel resonance circuit is

Question # 6

A diode characteristic curve is a plot between

Question # 7

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

Question # 8

In describing functions of digital systems, a closed switch will be shown as

Question # 9

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

Question # 10

A P-N juction or semiconductor diode cannot be used as

Question # 11

In RLC series circuit, resonance occurs when

Question # 12

The RMS value of alternating current is:

Question # 13

In series RC circuit when R=Xc, then the phase angle is

Question # 14

Average value of A.C voltage during one cycle is

Question # 15

The sum of positive and negative peak values is called:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
2 The bridge circuit of full wave rectification uses
A. one diode
B. two diode
C. three diode
D. four diode
3 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
4 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
5 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
6 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
7 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
8 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
9 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
10 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these

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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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