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

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

Question # 2

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 3

At resonance frequency the impedance of parallel resonance circuit is

Question # 4

For a n-p-n transistor, the conventional current equation can be written as

Question # 5

The magnitude of alternative voltage V:

Question # 6

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 7

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 # 8

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 # 9

The phase angle of a series RLC circuit at resonance is

Question # 10

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

Question # 11

The most common source of alternating voltage is:

Question # 12

The closed loop gain of the inverting amplifier is written as

Question # 13

The power factor of resonant series circuit is

Question # 14

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

Question # 15

In RLC series circuit, resonance occurs when

Question # 16

The sum of positive and negative peak values is called:

Question # 17

Chock consumes externally small

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

Alternating current can induce voltage because it has a

Question # 22

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

Question # 23

SI unit of impedance is

Question # 24

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 25

The waveform of alternating voltage is a:

Question # 26

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

Question # 27

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 28

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

Question # 29

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

Question # 30

At resonance, the impedance of RLC series circuit is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The bridge circuit of full wave rectification uses
A. one diode
B. two diode
C. three diode
D. four diode
2 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
3 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
4 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
5 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
6 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
7 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
8 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
9 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
10 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°

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