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

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 2

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 3

The magnitude of alternative voltage V:

Question # 4

The wave form of alternating voltage is the graph between:

Question # 5

During the positive half-cycle in the half-wave rectification,the diode

Question # 6

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

Question # 7

The phase at the positive peak of an A.C. cycle is:

Question # 8

In free space, the speed of electromagnetic waves is

Question # 9

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 10

At resonance frequency the impedance of parallel resonance circuit is

Question # 11

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 12

Which of the following has a great concentration of impurity

Question # 13

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

Question # 14

Which of the following diode is used for the detection of light

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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)
3 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)
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 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
6 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
7 The amplifier which us used to perform mathematical operations electronically is known as
A. calculator
B. OP-AMP
C. computer
D. any one of them
8 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
9 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
10 The bridge circuit of full wave rectification uses
A. one diode
B. two diode
C. three diode
D. four diode

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