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

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 # 3

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

Question # 4

In free space, the speed of electromagnetic waves is

Question # 5

A changing magnetic flux creates around itself

Question # 6

The output voltage of half wave rectification is in the form of

Question # 7

For normal operation of transistor, the batteries

Question # 8

Chock consumes externally small

Question # 9

The total reactance of a series RLC circuit at resonance is

Question # 10

The magnitude of alternative voltage V:

Question # 11

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

Question # 12

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 13

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

Question # 14

Peak value of alternative current is:

Question # 15

The basic circuit element in A.C. circuits are:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
2 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
3 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)
4 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
5 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
6 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
7 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
8 Which of the following diodes can operate in the reverse biased condition
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
9 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
10 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

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