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

Question # 2

In which of the following components, pn-junction is used

Question # 3

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

Question # 4

The waveform of alternating voltage is a:

Question # 5

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

Question # 6

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 7

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 8

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 9

The average of A.C. current and voltage over a complete cycle is

Question # 10

In half wave rectification

Question # 11

The input resistance of the OP-AMP is the resistance between the

Question # 12

The basic circuit element in D.C. circuit is:

Question # 13

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

Question # 14

The total reactance of a series RLC circuit at resonance is

Question # 15

A changing magnetic flux creates around itself

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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)
2 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
3 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
4 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
5 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
6 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
7 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
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 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
10 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase

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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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