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

Question # 2

Which one of the following is correct?

Question # 3

During the negative half-cycle of the half-wave rectification, the diode

Question # 4

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

Question # 5

Alternating current is produced by a voltage source which polarity:

Question # 6

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

Question # 7

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 8

Average value of A.C voltage during one cycle is

Question # 9

An A.C varies as a function of

Question # 10

For the normal operation of the transistor, its

Question # 11

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

Question # 12

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 # 13

In series RC circuit when R=Xc, then the phase angle is

Question # 14

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

Question # 15

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

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ECAT Physics Chapter 16 Important MCQ's

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

B. 90º

C. 180º

D. 0 andᏘ
2 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
3 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
4 The value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V
5 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
6 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
7 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
8 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
9 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
10 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

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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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