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 basic circuit elements of A.C circuit are

Question # 2

At resonance, the phase angle for RLC series resonance circuit equals

Question # 3

The waveform of alternating voltage is a:

Question # 4

Alternating current can be transmitted:

Question # 5

The basic circuit element in A.C. circuits are:

Question # 6

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

Question # 7

For normal operation of transistor, the batteries

Question # 8

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

Question # 9

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 10

Electromagnetic waves transmit energy equal to

Question # 11

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

Question # 12

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

Question # 13

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 14

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

Question # 15

The device which allows only the flow of an A.C. through a circuit is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
2 When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
3 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
4 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1
5 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
6 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
7 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
8 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
9 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
10 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

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