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

In n-p-n transistor, emitter base junction is kept

Question # 2

In frequency modulation (FM), the carrier waves amplitude

Question # 3

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

Question # 4

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 5

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 6

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 7

The alternative voltage of current is actually measured by:

Question # 8

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

Question # 9

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

Question # 10

The Instantaneous value of alternative current maybe:

Question # 11

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

Question # 12

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 13

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

Question # 14

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

Question # 15

Which of the following has a great concentration of impurity

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
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 magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
5 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
6 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
7 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
8 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
9 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
10 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate

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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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