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 half wave rectification

Question # 2

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

Question # 3

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 # 4

OP-AMP has the following input terminals

Question # 5

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

Question # 6

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 7

The phase at the positive peak of an A.C. cycle is:

Question # 8

At resonance frequency the impedance of parallel resonance circuit is

Question # 9

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 10

Which one of the following waves belongs to electromagnetic spectrum

Question # 11

The waveform of alternating voltage is a:

Question # 12

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 13

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 14

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
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 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
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
6 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
7 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
8 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
9 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
10 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

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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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