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 an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 2

The waveform of alternating voltage is a:

Question # 3

In a transistor, if the central region is p-type then this type of transistor is known as

Question # 4

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

Question # 5

A diode characteristic curve is a plot between

Question # 6

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

Question # 7

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 8

Which of the following has a great concentration of impurity

Question # 9

In RLC series circuit, resonance occurs when

Question # 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

Question # 11

In a transistor, if the central region is n-type, then this type of transistor is known as

Question # 12

Most OP-AMP operates with

Question # 13

The phase angle of a series RLC circuit at resonance is

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
2 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
3 The bridge circuit of full wave rectification uses
A. one diode
B. two diode
C. three diode
D. four diode
4 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
5 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
6 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
7 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
8 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
9 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°
10 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
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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