ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

A digital system deals with quantities or variables which have

Question # 2

Alternating current can be transmitted:

Question # 3

The impedance of RLC series resonance circuit at resonant frequency is

Question # 4

In a transistor, if the central region is n-type, then this type of transistor is known as

Question # 5

Chock consumes externally small

Question # 6

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 7

The wave form of alternating voltage is the graph between:

Question # 8

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

Question # 9

Which one of the following is correct?

Question # 10

At resonance, the impedance of RLC series circuit is

Question # 11

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

Question # 12

The waveform of alternating voltage is a:

Question # 13

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 # 14

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 15

Alternating current can induce voltage because it has a

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
2 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
3 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
4 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
5 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
6 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
7 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
8 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
9 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
10 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases

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