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

Question # 2

In a transistor, the central region is called

Question # 3

A digital system deals with quantities or variables which have

Question # 4

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 5

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

Question # 6

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

Question # 7

The Instantaneous value of alternative current maybe:

Question # 8

The value of the input resistance of OP-AMP is of the order of

Question # 9

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

Question # 10

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

Question # 11

The basic circuit elements of A.C circuit are

Question # 12

Average value of A.C voltage during one cycle is

Question # 13

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

Question # 14

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 15

The impedance of RLC series resonance circuit at resonant frequency is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
3 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
4 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
5 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
6 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
7 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
8 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
9 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1
10 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

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