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

Question # 2

The output voltage of half wave rectification is in the form of

Question # 3

The closed loop gain of the inverting amplifier is written as

Question # 4

At resonance, the phase angle for RLC series resonance circuit equals

Question # 5

For normal operation of transistor, the batteries

Question # 6

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

Question # 7

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 8

Average value of A.C voltage during one cycle is

Question # 9

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

Question # 10

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 11

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

Question # 12

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

Question # 13

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

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 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
2 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
3 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
4 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
5 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)
6 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
7 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
8 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
9 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
10 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts

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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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