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

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

Question # 2

The input resistance of the OP-AMP is the resistance between the

Question # 3

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 4

Transmitting antenna emits

Question # 5

The highest value reached by the voltage or current:

Question # 6

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

Question # 7

Which of the following has a great concentration of impurity

Question # 8

When the p-n junction is forward biased its resistance is of the order of

Question # 9

The Instantaneous value of alternative current maybe:

Question # 10

In frequency modulation (FM), the carrier waves amplitude

Question # 11

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

Question # 12

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

Question # 13

The alternative voltage of current is actually measured by:

Question # 14

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

Question # 15

Which one of the following is correct?

Question # 16

A changing magnetic flux creates around itself

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

The phase angle of a series RLC circuit at resonance is

Question # 24

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

Question # 25

An A.C varies as a function of

Question # 26

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

Question # 27

The power factor of resonant series circuit is

Question # 28

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

Question # 29

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

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 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
2 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
3 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
4 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
5 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
6 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
7 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
8 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
9 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
10 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these

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