ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

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

Question # 2

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 3

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

Question # 4

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

Question # 5

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

Question # 6

During each cycle, alternating voltage reaches a peak value

Question # 7

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

Question # 8

Which of the following diode is used for the detection of light

Question # 9

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 10

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

Question # 11

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

Question # 12

Peak value of alternative current is:

Question # 13

In RLC series circuit, resonance occurs when

Question # 14

The basic circuit element in A.C. circuits are:

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The value of the input resistance of OP-AMP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several maga ohms
2 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
3 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
4 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
5 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
6 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
7 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
8 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
9 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
10 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

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  • Iiqra Fatima

    Iiqra Fatima

    25 May 2018

    You should let us practice difficult mcqs ..These are too easy for ECAT level....Thanku

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