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

Alternating current is produced by a voltage source which polarity:

Question # 2

In free space, the speed of electromagnetic waves is

Question # 3

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

Question # 4

Which of the following diode is used for the detection of light

Question # 5

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

Question # 6

Chock consumes externally small

Question # 7

Alternating current can be transmitted:

Question # 8

The time interval during which the Voltage source changes its polarity once is known as:

Question # 9

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

Question # 10

OP-AMP has the following input terminals

Question # 11

An A.C varies as a function of

Question # 12

The basic circuit elements of A.C circuit are

Question # 13

A diode characteristic curve is a plot between

Question # 14

For the normal operation of the transistor, its

Question # 15

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

Question # 16

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

Question # 17

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 # 18

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

Question # 19

The RMS value of alternating current is:

Question # 20

Average value of A.C voltage during one cycle is

Question # 21

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

Question # 22

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

Question # 23

Conversion of alternating current into direct current is called

Question # 24

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

Question # 25

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 # 26

The impedance of RLC series resonance circuit at resonant frequency is

Question # 27

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

Question # 28

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

Question # 29

Peak value of alternative current is:

Question # 30

The wave form of alternating voltage is the graph between:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
2 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
3 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
4 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
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
5 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
6 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
7 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
8 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
9 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
10 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

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