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

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

Question # 2

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

Question # 3

In free space, the speed of electromagnetic waves is

Question # 4

The phase angle of a series RLC circuit at resonance is

Question # 5

For a n-p-n transistor, the conventional current equation can be written as

Question # 6

Conversion of alternating current into direct current is called

Question # 7

The sum of positive and negative peak values is called:

Question # 8

The Instantaneous value of alternative current maybe:

Question # 9

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

Question # 10

A P-N juction or semiconductor diode cannot be used as

Question # 11

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 12

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

Question # 13

The highest value reached by the voltage or current:

Question # 14

The RMS value of alternating current is:

Question # 15

Transmitting antenna emits

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
2 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
3 A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
4 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)
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 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)
7 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
8 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
9 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
10 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them

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