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

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 2

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

Question # 3

The total reactance of a series RLC circuit at resonance is

Question # 4

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

Question # 5

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 6

In a transistor, if the central region is p-type then this type of transistor is known as

Question # 7

The length of rotating vector (on a certain scale) represents the:

Question # 8

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

Question # 9

Which of the following diodes can operate in the reverse biased condition

Question # 10

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

Question # 11

Which one of the following waves belongs to electromagnetic spectrum

Question # 12

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

Question # 13

The impedance of RLC series resonance circuit at resonant frequency is

Question # 14

For the normal operation of the transistor, its

Question # 15

The open loop gain of OP-AMP is of the order of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
2 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
3 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
4 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF
5 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
6 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
7 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
8 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
9 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
10 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
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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