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 Instantaneous value of alternative current maybe:

Question # 2

Which of the following has a great concentration of impurity

Question # 3

Conversion of alternating current into direct current is called

Question # 4

A changing magnetic flux creates around itself

Question # 5

The impedance of RLC series resonance circuit at resonant frequency is

Question # 6

Alternating current is produced by a voltage source which polarity:

Question # 7

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 8

OP-AMP has the following input terminals

Question # 9

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

Question # 10

A digital system deals with quantities or variables which have

Question # 11

At resonance frequency the impedance of parallel resonance circuit is

Question # 12

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

Question # 13

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

Question # 14

A diode characteristic curve is a plot between

Question # 15

In a normally biased n-p-n transistor, an electron c current IEflows from the

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
D. none of these
2 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
3 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
4 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
5 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
6 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°
7 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
8 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
9 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
10 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ

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