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

Which of the following has a great concentration of impurity

Question # 2

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

Question # 3

Most OP-AMP operates with

Question # 4

Alternating current can induce voltage because it has a

Question # 5

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 6

In a transistor, the central region is called

Question # 7

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

Question # 8

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

Question # 9

A changing magnetic flux creates around itself

Question # 10

For the normal operation of the transistor, its

Question # 11

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

Question # 12

In RLC series circuit, resonance occurs when

Question # 13

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

Question # 14

The closed loop gain of the inverting amplifier is written as

Question # 15

The value of current gain of n-p-n transistor is of the order of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
2 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
3 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
4 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
5 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
6 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
7 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
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 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
10 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

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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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