ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

Try The 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

A P-N juction or semiconductor diode cannot be used as

Question # 2

In frequency modulation (FM), the carrier waves amplitude

Question # 3

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

Question # 4

The RMS value of alternating current is:

Question # 5

The wave form of alternating voltage is the graph between:

Question # 6

SI unit of impedance is

Question # 7

The phase angle of a series RLC circuit at resonance is

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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 # 12

In a transistor, if the central region is n-type, then this type of transistor is known as

Question # 13

A digital system deals with quantities or variables which have

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

Question # 20

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

Question # 21

The most common source of alternating voltage is:

Question # 22

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

Question # 23

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 24

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

Question # 25

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

Which of the following diodes can operate in the reverse biased condition

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
3 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC
4 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
5 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
6 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1
7 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
8 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
9 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
10 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

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