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

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

Question # 2

The impedance of RLC series resonance circuit at resonant frequency is

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The basic circuit elements of A.C circuit are

Question # 7

The phase at the positive peak of an A.C. cycle is:

Question # 8

During the negative half-cycle of the half-wave rectification, the diode

Question # 9

Which of the following diodes can operate in the reverse biased condition

Question # 10

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

Question # 11

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

Question # 12

A changing magnetic flux creates around itself

Question # 13

The wave form of alternating voltage is the graph between:

Question # 14

In series RC circuit when R=Xc, then the phase angle is

Question # 15

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

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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 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
3 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
4 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
5 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1
6 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
7 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
8 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
9 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
10 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero

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