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 closed loop gain of the non-inverting amplifier is given by

Question # 2

OP-AMP has the following input terminals

Question # 3

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 4

Which one of the following is correct?

Question # 5

When the p-n junction is forward biased its resistance is of the order of

Question # 6

The power factor of resonant series circuit is

Question # 7

The highest value reached by the voltage or current:

Question # 8

The waveform of alternating voltage is a:

Question # 9

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 10

Electromagnetic waves transmit energy equal to

Question # 11

The amplifier which us used to perform mathematical operations electronically is known as

Question # 12

Which of the following has a great concentration of impurity

Question # 13

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 14

The basic circuit elements of A.C circuit are

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
2 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
3 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
4 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
5 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
6 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF
7 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
8 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
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 a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these

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