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

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

Question # 2

Which of the following diodes can operate in the reverse biased condition

Question # 3

Chock consumes externally small

Question # 4

The closed loop gain of the non-inverting amplifier is given by

Question # 5

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

Question # 6

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

Question # 7

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 8

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

Question # 9

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 10

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 11

In RLC series circuit, resonance occurs when

Question # 12

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 13

The amplifier which us used to perform mathematical operations electronically is known as

Question # 14

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

Question # 15

Which one of the following waves belongs to electromagnetic spectrum

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
2 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
D. none of these
3 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
4 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
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 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
7 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
8 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
9 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
10 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

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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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