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

In n-p-n transistor, emitter base junction is kept

Question # 2

Most OP-AMP operates with

Question # 3

The closed loop gain of the inverting amplifier is written as

Question # 4

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

Question # 5

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

Question # 6

The power factor of resonant series circuit is

Question # 7

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 # 8

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

Question # 9

The value of the input resistance of OP-AMP is of the order of

Question # 10

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 # 11

The value of current gain of n-p-n transistor is of the order of

Question # 12

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

Question # 13

The wave form of alternating voltage is the graph between:

Question # 14

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

Question # 15

Peak value of alternative current is:

Question # 16

Conversion of alternating current into direct current is called

Question # 17

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

Question # 18

The value of output resistance of OP-AMOP is of the order of

Question # 19

In a transistor, the central region is called

Question # 20

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

Question # 21

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

Question # 22

Electromagnetic waves transmit energy equal to

Question # 23

A digital system deals with quantities or variables which have

Question # 24

For normal operation of transistor, the batteries

Question # 25

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

Question # 26

OP-AMP has the following input terminals

Question # 27

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

Question # 28

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

Question # 29

For the normal operation of the transistor, its

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
2 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
3 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
4 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
5 The highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value
6 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
7 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts
8 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
9 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
10 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these

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