ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 16 Alternating Current

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

The sum of positive and negative peak values is called:

Question # 2

In n-p-n transistor, emitter base junction is kept

Question # 3

Alternating current can be transmitted:

Question # 4

A diode characteristic curve is a plot between

Question # 5

Alternating current can induce voltage because it has a

Question # 6

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

Question # 7

The basic circuit elements of A.C circuit are

Question # 8

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

Question # 9

The basic circuit element in D.C. circuit is:

Question # 10

The waveform of alternating voltage is a:

Question # 11

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 12

A digital system deals with quantities or variables which have

Question # 13

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 14

In RLC series circuit, resonance occurs when

Question # 15

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

Question # 16

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

Question # 17

The bridge circuit of full wave rectification uses

Question # 18

The device which allows only the flow of an A.C. through a circuit is

Question # 19

Transmitting antenna emits

Question # 20

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 21

Alternating current is produced by a voltage source which polarity:

Question # 22

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 23

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

Question # 24

The length of rotating vector (on a certain scale) represents the:

Question # 25

For normal operation of transistor, the batteries

Question # 26

At resonance, the phase angle for RLC series resonance circuit equals

Question # 27

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

Question # 28

The Instantaneous value of alternative current maybe:

Question # 29

Conversion of alternating current into direct current is called

Question # 30

The phase angle of a series RLC circuit at resonance is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
A. Instantaneous value
B. RMS value
C. Value averaged over a cycle
D. Either (B) or (C)
2 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
3 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
4 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
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 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
7 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
D. Both (A) and (C)
8 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
9 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
10 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these

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