ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 16 Alternating Current

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

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

Question # 2

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

Question # 3

In a transistor, if the central region is n-type, then this type of transistor is known as

Question # 4

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 5

Which of the following has a great concentration of impurity

Question # 6

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

Question # 7

Transmitting antenna emits

Question # 8

Alternating current can be transmitted:

Question # 9

Conversion of alternating current into direct current is called

Question # 10

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

Question # 11

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

Question # 12

The RMS value of alternating current is:

Question # 13

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

Question # 14

The length of rotating vector (on a certain scale) represents the:

Question # 15

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 16

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

Question # 17

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

Question # 18

The waveform of alternating voltage is a:

Question # 19

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

Question # 20

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 21

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

Question # 22

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

Question # 23

Average value of A.C voltage during one cycle is

Question # 24

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

Question # 25

Which one of the following is correct?

Question # 26

A digital system deals with quantities or variables which have

Question # 27

The total reactance of a series RLC circuit at resonance is

Question # 28

Electromagnetic waves transmit energy equal to

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
3 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
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 power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
6 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
7 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
8 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
9 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
10 The value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V

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