ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

The average of A.C. current and voltage over a complete cycle is

Question # 2

The alternative voltage of current is actually measured by:

Question # 3

The total reactance of a series RLC circuit at resonance is

Question # 4

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

Question # 5

A diode characteristic curve is a plot between

Question # 6

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

Question # 7

The RMS value of alternating current is:

Question # 8

For the normal operation of the transistor, its

Question # 9

In series RC circuit when R=Xc, then the phase angle is

Question # 10

A digital system deals with quantities or variables which have

Question # 11

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

Question # 12

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

Question # 13

The phase angle of a series RLC circuit at resonance is

Question # 14

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

Question # 15

The Instantaneous value of alternative current maybe:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
3 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
4 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
5 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC
6 The highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value
7 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
8 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
9 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
10 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value

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