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 a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

Question # 2

Alternating current can induce voltage because it has a

Question # 3

The phase angle of a series RLC circuit at resonance is

Question # 4

In half wave rectification

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The Instantaneous value of alternative current maybe:

Question # 9

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

Question # 10

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 11

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 12

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

Question # 13

The impedance of RLC series resonance circuit at resonant frequency is

Question # 14

The output voltage of half wave rectification is in the form of

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
4 The bridge circuit of full wave rectification uses
A. one diode
B. two diode
C. three diode
D. four diode
5 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
6 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
7 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
8 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
9 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°
10 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable

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