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

For a n-p-n transistor, the conventional current equation can be written as

Question # 2

The phase angle of a series RLC circuit at resonance is

Question # 3

The closed loop gain of the inverting amplifier is written as

Question # 4

The most common source of alternating voltage is:

Question # 5

The total reactance of a series RLC circuit at resonance is

Question # 6

A digital system deals with quantities or variables which have

Question # 7

Alternating current is produced by a voltage source which polarity:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The basic circuit elements of A.C circuit are

Question # 13

The bridge circuit of full wave rectification uses

Question # 14

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 15

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

Question # 16

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

Question # 17

The value of output resistance of OP-AMOP is of the order of

Question # 18

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 19

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

Question # 20

The impedance of RLC series resonance circuit at resonant frequency is

Question # 21

Which one of the following is correct?

Question # 22

The magnitude of alternative voltage V:

Question # 23

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

Question # 24

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 25

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

Question # 26

At resonance frequency the impedance of parallel resonance circuit is

Question # 27

The power factor of resonant series circuit is

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
2 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
3 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
4 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
5 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
6 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
7 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
8 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
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
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
10 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

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