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

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 2

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 3

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 4

Transmitting antenna emits

Question # 5

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

Question # 6

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 7

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

Question # 8

At resonance, the impedance of RLC series circuit is

Question # 9

Peak value of alternative current is:

Question # 10

Which of the following has a great concentration of impurity

Question # 11

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 12

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

Question # 13

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

Question # 14

The RMS value of alternating current is:

Question # 15

The alternative voltage of current is actually measured by:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
3 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
4 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
5 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
6 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
7 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
8 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
9 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
10 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
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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