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 has a great concentration of impurity

Question # 2

The alternative voltage of current is actually measured by:

Question # 3

Alternating current can induce voltage because it has a

Question # 4

Average value of A.C voltage during one cycle is

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The open loop gain of OP-AMP is of the order of

Question # 9

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 10

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

Question # 11

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 12

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

Question # 13

During the negative half-cycle of the half-wave rectification, the diode

Question # 14

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

Question # 15

In free space, the speed of electromagnetic waves is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
3 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
4 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
5 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
6 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
7 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
8 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
9 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
10 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF

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