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

The basic circuit element in A.C. circuits are:

Question # 2

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

Question # 3

During the negative half-cycle of the half-wave rectification, the diode

Question # 4

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 5

The sum of positive and negative peak values is called:

Question # 6

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

Question # 7

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

Question # 8

In frequency modulation (FM), the carrier waves amplitude

Question # 9

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 10

A diode characteristic curve is a plot between

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Which of the following has a great concentration of impurity

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
2 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
3 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
4 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one 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 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
7 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
8 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
9 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
10 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these

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  • Iiqra Fatima

    Iiqra Fatima

    25 May 2018

    You should let us practice difficult mcqs ..These are too easy for ECAT level....Thanku

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