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

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 2

The impedance of RLC series resonance circuit at resonant frequency is

Question # 3

Alternating current is produced by a voltage source which polarity:

Question # 4

The RMS value of alternating current is:

Question # 5

During the positive half-cycle in the half-wave rectification,the diode

Question # 6

The length of rotating vector (on a certain scale) represents the:

Question # 7

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 8

In a transistor, the central region is called

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 phase at the positive peak of an A.C. cycle is:

Question # 11

At resonance frequency the impedance of parallel resonance circuit is

Question # 12

The sum of positive and negative peak values is called:

Question # 13

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

Question # 14

A changing magnetic flux creates around itself

Question # 15

A diode characteristic curve is a plot between

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
2 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
3 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
4 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
5 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
6 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
7 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
8 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
9 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
10 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

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