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

Question # 2

Alternating current is produced by a voltage source which polarity:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

A digital system deals with quantities or variables which have

Question # 7

The wave form of alternating voltage is the graph between:

Question # 8

Electromagnetic waves transmit energy equal to

Question # 9

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

Question # 10

The closed loop gain of the non-inverting amplifier is given by

Question # 11

Conversion of alternating current into direct current is called

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Which of the following diode is used for the detection of light

Question # 16

The average of A.C. current and voltage over a complete cycle is

Question # 17

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 # 18

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 # 19

The total reactance of a series RLC circuit at resonance is

Question # 20

The Instantaneous value of alternative current maybe:

Question # 21

In frequency modulation (FM), the carrier waves amplitude

Question # 22

The bridge circuit of full wave rectification uses

Question # 23

The alternative voltage of current is actually measured by:

Question # 24

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 25

In describing functions of digital systems, a closed switch will be shown as

Question # 26

The value of the potential difference across the depletion region for the case of germanium is

Question # 27

Average value of A.C voltage during one cycle is

Question # 28

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

Question # 29

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
4 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
5 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
6 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
7 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
8 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
9 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
10 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105

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