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

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

Question # 2

Which one of the following is correct?

Question # 3

Alternating current is produced by a voltage source which polarity:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

During each cycle, alternating voltage reaches a peak value

Question # 8

The total reactance of a series RLC circuit at resonance is

Question # 9

A changing magnetic flux creates around itself

Question # 10

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 11

The basic circuit elements of A.C circuit are

Question # 12

At resonance frequency the impedance of parallel resonance circuit is

Question # 13

The wave form of alternating voltage is the graph between:

Question # 14

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 15

Alternating current can induce voltage because it has a

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
2 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
3 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
4 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
5 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
6 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
7 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
8 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
9 The RMS value of alternating current is:
A. 0.7 times at the peak value
B. 0.5 times the peak value
C. 0.7 times the Instantaneous value
D. Equal to maximum voltage
10 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them

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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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