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

Peak value of alternative current is:

Question # 2

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

Question # 3

The total reactance of a series RLC circuit at resonance is

Question # 4

The amplifier which us used to perform mathematical operations electronically is known as

Question # 5

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

Question # 6

At resonance frequency the impedance of parallel resonance circuit is

Question # 7

In a transistor, the central region is called

Question # 8

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

Question # 9

The waveform of alternating voltage is a:

Question # 10

The wave form of alternating voltage is the graph between:

Question # 11

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

Question # 12

Which one of the following waves belongs to electromagnetic spectrum

Question # 13

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

Question # 14

SI unit of impedance is

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
3 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)
4 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
5 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
6 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
7 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
8 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
9 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
10 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these

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