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

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

Question # 2

At resonance frequency the impedance of parallel resonance circuit is

Question # 3

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 4

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

Question # 5

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 # 6

During the positive half-cycle in the half-wave rectification,the diode

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Conversion of alternating current into direct current is called

Question # 11

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

Question # 12

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

Question # 13

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 14

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

Question # 15

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

Question # 16

Chock consumes externally small

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

For normal operation of transistor, the batteries

Question # 21

During each cycle, alternating voltage reaches a peak value

Question # 22

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 23

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 24

The phase angle of a series RLC circuit at resonance is

Question # 25

The bridge circuit of full wave rectification uses

Question # 26

Peak value of alternative current is:

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

Alternating current is produced by a voltage source which polarity:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
2 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
3 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
4 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
5 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
6 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither 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 basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
9 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
10 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these

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