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 entire wave form of sinusoidal voltage is actually a set of all the:

Question # 2

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 3

In n-p-n transistor, emitter base junction is kept

Question # 4

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

Question # 5

A diode characteristic curve is a plot between

Question # 6

In free space, the speed of electromagnetic waves is

Question # 7

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 8

At resonance frequency the impedance of parallel resonance circuit is

Question # 9

Alternating current can induce voltage because it has a

Question # 10

The alternative voltage of current is actually measured by:

Question # 11

The total reactance of a series RLC circuit at resonance is

Question # 12

In describing functions of digital systems, a closed switch will be shown as

Question # 13

The basic circuit element in D.C. circuit is:

Question # 14

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

Question # 15

Alternating current can be transmitted:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
2 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
3 The value of the input resistance of OP-AMP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several maga ohms
4 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
5 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts
6 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
7 The basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
8 If we connect a A.C. volt meter to read A.C. voltage, It would read its:
A. RMS value
B. Instantaneous value
C. Valued average over a cycle
D. Zero
9 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
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
10 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant

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