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

The input resistance of the OP-AMP is the resistance between the

Question # 2

Electromagnetic waves transmit energy equal to

Question # 3

Peak value of alternative current is:

Question # 4

In RLC series circuit, resonance occurs when

Question # 5

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 6

A P-N juction or semiconductor diode cannot be used as

Question # 7

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 8

The open loop gain of OP-AMP is of the order of

Question # 9

A diode characteristic curve is a plot between

Question # 10

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

Question # 11

The value of the input resistance of OP-AMP is of the order of

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Which one of the following is correct?

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
3 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
4 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
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 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
7 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
8 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
9 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
10 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5

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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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