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

Question # 2

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 3

The Instantaneous value of alternative current maybe:

Question # 4

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

Question # 5

When the p-n junction is forward biased its resistance is of the order of

Question # 6

Which of the following has a great concentration of impurity

Question # 7

The value of the potential difference across the depletion region for the case of germanium is

Question # 8

The sum of positive and negative peak values is called:

Question # 9

The basic circuit elements of A.C circuit are

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

In free space, the speed of electromagnetic waves is

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
2 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
3 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
4 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
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 total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
7 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
8 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
9 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
10 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero

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