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 value of the potential difference across the depletion region for the case of germanium is

Question # 2

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

Question # 3

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 4

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 5

The power factor of resonant series circuit is

Question # 6

The open loop gain of OP-AMP is of the order of

Question # 7

A changing magnetic flux creates around itself

Question # 8

In frequency modulation (FM), the carrier waves amplitude

Question # 9

A diode characteristic curve is a plot between

Question # 10

In a transistor, the central region is called

Question # 11

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 # 12

The most common source of alternating voltage is:

Question # 13

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

Question # 14

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 15

In which of the following components, pn-junction is used

Question # 16

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

Question # 17

An A.C varies as a function of

Question # 18

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

Question # 19

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

Question # 20

In RLC series circuit, resonance occurs when

Question # 21

For the normal operation of the transistor, its

Question # 22

Average value of A.C voltage during one cycle is

Question # 23

The closed loop gain of the non-inverting amplifier is given by

Question # 24

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 25

Conversion of alternating current into direct current is called

Question # 26

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 27

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

Question # 28

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 29

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

Question # 30

During each cycle, alternating voltage reaches a peak value

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
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 value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V
4 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
5 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
6 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
7 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
8 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
9 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
10 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these

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