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 phase angle of a series RLC circuit at resonance is

Question # 2

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 3

Chock consumes externally small

Question # 4

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

Question # 5

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 6

The most common source of alternating voltage is:

Question # 7

In RLC series circuit, resonance occurs when

Question # 8

In half wave rectification

Question # 9

Which of the following has a great concentration of impurity

Question # 10

The device which allows only the flow of an A.C. through a circuit is

Question # 11

The total reactance of a series RLC circuit at resonance is

Question # 12

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 13

An A.C varies as a function of

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
2 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
3 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
4 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
5 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
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 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
8 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)
9 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
10 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above

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