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 basic circuit element in D.C. circuit is:

Question # 2

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

Question # 3

The magnitude of alternative voltage V:

Question # 4

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

Question # 5

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 6

In frequency modulation (FM), the carrier waves amplitude

Question # 7

The most common source of alternating voltage is:

Question # 8

In describing functions of digital systems, a closed switch will be shown as

Question # 9

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

Question # 10

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 11

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

Question # 12

Peak value of alternative current is:

Question # 13

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

Question # 14

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
2 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
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 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
5 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
6 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
7 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
8 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
9 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
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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