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 value of current gain of n-p-n transistor is of the order of

Question # 2

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

Question # 3

During each cycle, alternating voltage reaches a peak value

Question # 4

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 5

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

Question # 6

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

Question # 7

The basic circuit elements of A.C circuit are

Question # 8

For the normal operation of the transistor, its

Question # 9

Average value of A.C voltage during one cycle is

Question # 10

The output voltage of half wave rectification is in the form of

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The phase angle of a series RLC circuit at resonance is

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 A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
2 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
3 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
4 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
5 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
6 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
7 In n-p-n transistor, emitter base junction is kept
A. reversed
B. forward biased
C. may be reversed or may be forward biased
D. none of these
8 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
9 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
10 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive

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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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