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

Which of the following diodes can operate in the reverse biased condition

Question # 2

In half wave rectification

Question # 3

The average of A.C. current and voltage over a complete cycle is

Question # 4

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

Question # 5

Which one of the following waves belongs to electromagnetic spectrum

Question # 6

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 # 7

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

Question # 8

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 9

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

Question # 10

At resonance frequency the impedance of parallel resonance circuit is

Question # 11

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

Question # 12

The wave form of alternating voltage is the graph between:

Question # 13

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

Question # 14

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

Question # 15

Electromagnetic waves transmit energy equal to

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts
2 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
3 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
4 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
5 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
6 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
7 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
8 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°
9 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one 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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