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

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 2

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

Question # 3

Average value of A.C voltage during one cycle is

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

In free space, the speed of electromagnetic waves is

Question # 8

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

Question # 9

The input resistance of the OP-AMP is the resistance between the

Question # 10

During each cycle, alternating voltage reaches a peak value

Question # 11

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

Question # 12

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

Question # 13

Which one of the following is correct?

Question # 14

The time interval during which the Voltage source changes its polarity once is known as:

Question # 15

The Instantaneous value of alternative current maybe:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
2 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
3 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
4 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
5 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
6 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
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 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
9 The RMS value of alternating current is:
A. 0.7 times at the peak value
B. 0.5 times the peak value
C. 0.7 times the Instantaneous value
D. Equal to maximum voltage
10 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°

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