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

Question # 2

The alternative voltage of current is actually measured by:

Question # 3

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 4

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

Question # 5

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

Question # 6

At resonance, the phase angle for RLC series resonance circuit equals

Question # 7

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

Question # 8

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

Question # 9

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 10

Conversion of alternating current into direct current is called

Question # 11

The power factor of resonant series circuit is

Question # 12

In which of the following components, pn-junction is used

Question # 13

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

Question # 14

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 15

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
2 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
3 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
4 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
5 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
6 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
7 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
8 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
9 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
10 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

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