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

The open loop gain of OP-AMP is of the order of

Question # 2

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

Question # 3

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

Question # 4

In free space, the speed of electromagnetic waves is

Question # 5

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

Question # 6

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

Question # 7

The highest value reached by the voltage or current:

Question # 8

The impedance of RLC series resonance circuit at resonant frequency is

Question # 9

The most common source of alternating voltage is:

Question # 10

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

Question # 11

At resonance, the phase angle for RLC series resonance circuit equals

Question # 12

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

Question # 13

The waveform of alternating voltage is a:

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

A changing magnetic flux creates around itself

Question # 19

Chock consumes externally small

Question # 20

The basic circuit elements of A.C circuit are

Question # 21

Electromagnetic waves transmit energy equal to

Question # 22

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

Question # 23

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

Question # 24

Transmitting antenna emits

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

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

Question # 27

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 # 28

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 29

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

Question # 30

The sum of positive and negative peak values is called:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
4 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
5 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
6 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
7 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
8 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
9 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC
10 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

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