ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

Conversion of alternating current into direct current is called

Question # 2

When the p-n junction is forward biased its resistance is of the order of

Question # 3

The total reactance of a series RLC circuit at resonance is

Question # 4

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

Question # 5

In free space, the speed of electromagnetic waves is

Question # 6

The bridge circuit of full wave rectification uses

Question # 7

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 8

SI unit of impedance is

Question # 9

Peak value of alternative current is:

Question # 10

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

Question # 11

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

Question # 12

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 13

The phase angle of a series RLC circuit at resonance is

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
3 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
4 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
5 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
6 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
7 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
8 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
9 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
10 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ

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