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

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 # 2

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

Question # 3

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

Question # 4

The basic circuit element in D.C. circuit is:

Question # 5

The impedance of RLC series resonance circuit at resonant frequency is

Question # 6

For a n-p-n transistor, the conventional current equation can be written as

Question # 7

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 # 8

The highest value reached by the voltage or current:

Question # 9

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

Question # 10

Average value of A.C voltage during one cycle is

Question # 11

The most common source of alternating voltage is:

Question # 12

In frequency modulation (FM), the carrier waves amplitude

Question # 13

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 14

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

Question # 15

Transmitting antenna emits

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
4 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
5 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
6 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
7 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC
8 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
9 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
10 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105

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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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