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

Which of the following diodes can operate in the reverse biased condition

Question # 2

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

Question # 3

The impedance of RLC series resonance circuit at resonant frequency is

Question # 4

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

Question # 5

The phase angle of a series RLC circuit at resonance is

Question # 6

The value of the input resistance of OP-AMP is of the order of

Question # 7

During the positive half-cycle in the half-wave rectification,the diode

Question # 8

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 9

Which of the following diode is used for the detection of light

Question # 10

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

Question # 11

SI unit of impedance is

Question # 12

Alternating current can induce voltage because it has a

Question # 13

A changing magnetic flux creates around itself

Question # 14

The bridge circuit of full wave rectification uses

Question # 15

Most OP-AMP operates with

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
2 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
3 The RMS value of alternating current is:
A. 0.7 times at the peak value
B. 0.5 times the peak value
C. 0.7 times the Instantaneous value
D. Equal to maximum voltage
4 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
5 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
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 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
8 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
9 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
10 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms

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