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

A diode characteristic curve is a plot between

Question # 2

The basic circuit element in A.C. circuits are:

Question # 3

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 4

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 5

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

Question # 6

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

Question # 7

In RLC series circuit, resonance occurs when

Question # 8

Which of the following has a great concentration of impurity

Question # 9

In a transistor, the central region is called

Question # 10

A P-N juction or semiconductor diode cannot be used as

Question # 11

A digital system deals with quantities or variables which have

Question # 12

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

Question # 13

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 # 14

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 15

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
2 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
3 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
4 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
5 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
6 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None 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 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
9 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
10 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these

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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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