ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

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

Question # 2

The time interval during which the Voltage source changes its polarity once is known as:

Question # 3

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 4

The waveform of alternating voltage is a:

Question # 5

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

Question # 6

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

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

At resonance, the impedance of RLC series circuit is

Question # 9

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

Question # 10

Which of the following diode is used for the detection of light

Question # 11

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

Question # 12

During the positive half-cycle in the half-wave rectification,the diode

Question # 13

Conversion of alternating current into direct current is called

Question # 14

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 15

A diode characteristic curve is a plot between

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The bridge circuit of full wave rectification uses
A. one diode
B. two diode
C. three diode
D. four diode
3 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
4 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
5 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
6 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
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 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
9 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
10 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these

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