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

A diode characteristic curve is a plot between

Question # 2

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

Question # 3

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

Question # 4

The RMS value of alternating current is:

Question # 5

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

Question # 6

Alternating current can be transmitted:

Question # 7

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

Question # 8

In a transistor, the central region is called

Question # 9

Electromagnetic waves transmit energy equal to

Question # 10

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

Question # 11

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

Question # 12

The total reactance of a series RLC circuit at resonance is

Question # 13

Alternating current is produced by a voltage source which polarity:

Question # 14

In half wave rectification

Question # 15

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

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Sr. # Question Answer
1 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

2 Which one of the following is correct?

A. Vo= 1.414 Vrms

B. Iams= 1.414 Io

C.VO = 10.70 Vrms

D. Both a and b

3 A diode characteristic curve is a plot between

A. current and time

B. voltage and time

C.voltage and current

D. forward voltage and reversed voltage

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

A. Positive maximum value + Voand negative maximum value -Vo

B. Posiotive maximum value +Vo and zero

C.Zero and negative maximum value -Vo

D. Any of these

5 For the normal operation of the transistor, its

A. emitter-base and collector base junctions are forward biased

B. emitter-base junction is reversed biased and collector base junction is forward biased

C.emitter-base junction is forward biased and collector-base junction is reverse biased

D. any one of these

6 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

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

A. photo diode

B. light emitting diode

C.photo voltaic cell

D. all of them

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

A. A rectifier

B. Detector

C.Oscillator

D. An amplifier

9 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)

10 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

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

A. high - low

B. yes - no

C.on - off

D. 0 - 1

12 In RLC series circuit, resonance occurs when

A. XL > Xc

B. XL < Xc

C.XL = Xc

D. None of these

13 The magnitude of alternative voltage V:

A. Always increase

B. Always decrease

C.Remains constant

D. Does not remain constant

14 The input resistance of the OP-AMP is the resistance between the

A. (-) input and output

B. (+) input and output

C.(-) and (+) inputs

D. between any inputs

15 Average value of A.C voltage during one cycle is

A. 1

B. Zero

C.Maximum

D. Variable

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