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

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

Question # 3

The device which allows only the flow of an A.C. through a circuit is

Question # 4

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 5

The length of rotating vector (on a certain scale) represents the:

Question # 6

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

Question # 7

During each cycle, alternating voltage reaches a peak value

Question # 8

Alternating current can induce voltage because it has a

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The r.m.s. value of alternating current is equal to its maximum value at angle of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
2 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
3 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
4 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
5 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
6 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
7 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
8 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
9 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
10 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms

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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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