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 sum of positive and negative peak values is called:

Question # 2

Electromagnetic waves transmit energy equal to

Question # 3

The waveform of alternating voltage is a:

Question # 4

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 5

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

Question # 6

Alternating current can induce voltage because it has a

Question # 7

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

Question # 8

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 9

SI unit of impedance is

Question # 10

The open loop gain of OP-AMP is of the order of

Question # 11

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 12

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

Question # 13

The basic circuit elements of A.C circuit are

Question # 14

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The output voltage of half wave rectification is in the form of
A. a smooth curve
B. a smooth wave
C. pulses
D. all of the above
2 A diode characteristic curve is a plot between
A. current and time
B. voltage and time
C. voltage and current
D. forward voltage and reversed voltage
3 A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
4 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
5 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
6 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
7 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
8 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
9 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
10 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
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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