ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

The magnitude of alternative voltage V:

Question # 2

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 3

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

Question # 4

The impedance of RLC series resonance circuit at resonant frequency is

Question # 5

At resonance frequency the impedance of parallel resonance circuit is

Question # 6

In half wave rectification

Question # 7

Average value of A.C voltage during one cycle is

Question # 8

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

Question # 9

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

Question # 10

The most common source of alternating voltage is:

Question # 11

The highest value reached by the voltage or current:

Question # 12

A digital system deals with quantities or variables which have

Question # 13

OP-AMP has the following input terminals

Question # 14

Alternating current is produced by a voltage source which polarity:

Question # 15

During the positive half-cycle in the half-wave rectification,the diode

Question # 16

In a transistor, the central region is called

Question # 17

A P-N juction or semiconductor diode cannot be used as

Question # 18

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

Question # 19

Peak value of alternative current is:

Question # 20

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

Question # 21

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

Question # 22

Electromagnetic waves transmit energy equal to

Question # 23

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

Question # 24

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

Question # 25

Which one of the following waves belongs to electromagnetic spectrum

Question # 26

The total reactance of a series RLC circuit at resonance is

Question # 27

A changing magnetic flux creates around itself

Question # 28

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

Question # 29

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

Question # 30

When the pn-junction is forward biased. the current flows through it is of the order of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
2 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
3 A diode characteristic curve is a plot between
A. current and time
B. voltage and time
C. voltage and current
D. forward voltage and reversed voltage
4 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
5 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
6 The basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
7 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
8 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
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
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 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector

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