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

SI unit of impedance is

Question # 2

The device which allows only the flow of an A.C. through a circuit is

Question # 3

The wave form of alternating voltage is the graph between:

Question # 4

Alternating current can induce voltage because it has a

Question # 5

The total reactance of a series RLC circuit at resonance is

Question # 6

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 7

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

Question # 8

In a transistor, if the central region is n-type, then this type of transistor is known as

Question # 9

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

Question # 10

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

Question # 11

The sum of positive and negative peak values is called:

Question # 12

The basic circuit elements of A.C circuit are

Question # 13

A diode characteristic curve is a plot between

Question # 14

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

Question # 15

An A.C varies as a function of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
3 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
4 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
5 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
6 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
7 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
8 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
9 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
10 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these

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