ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

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

Question # 2

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

Question # 3

A digital system deals with quantities or variables which have

Question # 4

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 5

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

Question # 6

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

Question # 7

The waveform of alternating voltage is a:

Question # 8

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

Question # 9

The bridge circuit of full wave rectification uses

Question # 10

The magnitude of alternative voltage V:

Question # 11

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

Question # 12

The basic circuit elements of A.C circuit are

Question # 13

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 # 14

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

Question # 15

In frequency modulation (FM), the carrier waves amplitude

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ECAT Class Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 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
4 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
5 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
6 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
7 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
8 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
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 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1

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