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

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 2

Alternating current can be transmitted:

Question # 3

A changing magnetic flux creates around itself

Question # 4

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 5

The total reactance of a series RLC circuit at resonance is

Question # 6

The waveform of alternating voltage is a:

Question # 7

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 8

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

Question # 9

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

Question # 10

The value of current gain of n-p-n transistor is of the order of

Question # 11

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 12

Electromagnetic waves transmit energy equal to

Question # 13

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

Question # 14

In a transistor, the central region is called

Question # 15

A diode characteristic curve is a plot between

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
2 A diode characteristic curve is a plot between
A. current and time
B. voltage and time
C. voltage and current
D. forward voltage and reversed voltage
3 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
4 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
5 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
6 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
7 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
8 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states
9 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
10 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these

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