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

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

Question # 2

The basic circuit element in A.C. circuits are:

Question # 3

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

Question # 4

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 5

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 6

The time interval during which the Voltage source changes its polarity once is known as:

Question # 7

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

Question # 8

At resonance, the impedance of RLC series circuit is

Question # 9

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

Question # 10

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

Question # 11

Which one of the following waves belongs to electromagnetic spectrum

Question # 12

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 13

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

Question # 14

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 15

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
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 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
4 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
5 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
6 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
7 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
8 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
9 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
10 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above

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