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

Question # 2

In free space, the speed of electromagnetic waves is

Question # 3

The wave form of alternating voltage is the graph between:

Question # 4

When the p-n junction is forward biased its resistance is of the order of

Question # 5

The amplifier which us used to perform mathematical operations electronically is known as

Question # 6

Alternating current can induce voltage because it has a

Question # 7

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 # 8

Chock consumes externally small

Question # 9

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 # 10

Most OP-AMP operates with

Question # 11

A changing magnetic flux creates around itself

Question # 12

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 13

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

Question # 14

In frequency modulation (FM), the carrier waves amplitude

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
2 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states
3 The output voltage of half wave rectification is in the form of
A. a smooth curve
B. a smooth wave
C. pulses
D. all of the above
4 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
5 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
6 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
7 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
8 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
9 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
10 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal

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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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