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 most common source of alternating voltage is:

Question # 2

At resonance, the impedance of RLC series circuit is

Question # 3

Conversion of alternating current into direct current is called

Question # 4

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 5

Alternating current can induce voltage because it has a

Question # 6

A digital system deals with quantities or variables which have

Question # 7

The RMS value of alternating current is:

Question # 8

During each cycle, alternating voltage reaches a peak value

Question # 9

For normal operation of transistor, the batteries

Question # 10

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

Question # 11

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 # 12

Which one of the following waves belongs to electromagnetic spectrum

Question # 13

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 14

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 # 15

When the pn-junction is connected reversed biased, its resistance is of the order of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
A. Instantaneous value
B. RMS value
C. Value averaged over a cycle
D. Either (B) or (C)
2 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these
3 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
4 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
5 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
6 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
7 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
8 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
9 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
10 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

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