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

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

Question # 2

For the normal operation of the transistor, its

Question # 3

In describing functions of digital systems, a closed switch will be shown as

Question # 4

Alternating current can induce voltage because it has a

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The input resistance of the OP-AMP is the resistance between the

Question # 9

The impedance of RLC series resonance circuit at resonant frequency is

Question # 10

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

Question # 11

Conversion of alternating current into direct current is called

Question # 12

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 13

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

Question # 14

The value of the input resistance of OP-AMP is of the order of

Question # 15

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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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 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
3 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
4 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
5 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
6 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
7 The amplifier which us used to perform mathematical operations electronically is known as
A. calculator
B. OP-AMP
C. computer
D. any one of them
8 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
9 A diode characteristic curve is a plot between
A. current and time
B. voltage and time
C. voltage and current
D. forward voltage and reversed voltage
10 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
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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