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

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 2

In a transistor, the central region is called

Question # 3

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 4

In which of the following components, pn-junction is used

Question # 5

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

Question # 6

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 7

During each cycle, alternating voltage reaches a peak value

Question # 8

In RLC series circuit, resonance occurs when

Question # 9

Average value of A.C voltage during one cycle is

Question # 10

The average of A.C. current and voltage over a complete cycle is

Question # 11

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 12

The magnitude of alternative voltage V:

Question # 13

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

Question # 14

Which one of the following is correct?

Question # 15

In describing functions of digital systems, a closed switch will be shown as

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
2 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
3 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
4 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
5 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
6 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states
7 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
8 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
9 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
10 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

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