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

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 2

The value of current gain of n-p-n transistor is of the order of

Question # 3

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 4

Alternating current is produced by a voltage source which polarity:

Question # 5

In a transistor, the central region is called

Question # 6

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

Question # 7

Which one of the following is correct?

Question # 8

The alternative voltage of current is actually measured by:

Question # 9

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

Question # 10

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

Question # 11

SI unit of impedance is

Question # 12

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 13

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 14

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

Question # 15

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
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 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
4 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
5 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
6 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
7 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
D. Both (A) and (C)
8 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
9 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC
10 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier

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