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

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

Question # 2

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

Question # 3

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

Question # 4

At resonance frequency the impedance of parallel resonance circuit is

Question # 5

The magnitude of alternative voltage V:

Question # 6

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 # 7

The phase angle of a series RLC circuit at resonance is

Question # 8

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

Question # 9

The average of A.C. current and voltage over a complete cycle is

Question # 10

Peak value of alternative current is:

Question # 11

Which one of the following is correct?

Question # 12

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

Question # 13

The basic circuit element in D.C. circuit is:

Question # 14

In describing functions of digital systems, a closed switch will be shown as

Question # 15

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
2 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
3 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
4 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
5 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
6 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
7 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
8 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
9 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
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

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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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