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

Transmitting antenna emits

Question # 2

Alternating current can be transmitted:

Question # 3

The alternative voltage of current is actually measured by:

Question # 4

The device which allows only the flow of an A.C. through a circuit is

Question # 5

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

Question # 6

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

Question # 7

The basic circuit elements of A.C circuit are

Question # 8

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 # 9

Which one of the following is correct?

Question # 10

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

Question # 11

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 12

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

Question # 13

The magnitude of alternative voltage V:

Question # 14

An A.C varies as a function of

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
D. none of these
2 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
3 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
4 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
5 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
6 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
7 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
8 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
9 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
10 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)

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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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