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 closed loop gain of the inverting amplifier is written as

Question # 2

The sum of positive and negative peak values is called:

Question # 3

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

Question # 4

For the normal operation of the transistor, its

Question # 5

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

Question # 6

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

Question # 7

Alternating current is produced by a voltage source which polarity:

Question # 8

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

Question # 9

Transmitting antenna emits

Question # 10

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

Question # 11

The basic circuit element in D.C. circuit is:

Question # 12

During each cycle, alternating voltage reaches a peak value

Question # 13

Which one of the following waves belongs to electromagnetic spectrum

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

The magnitude of alternative voltage V:

Question # 19

The highest value reached by the voltage or current:

Question # 20

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 21

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

Question # 22

The power factor of resonant series circuit is

Question # 23

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

Question # 24

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

Question # 25

The Instantaneous value of alternative current maybe:

Question # 26

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

Question # 27

Alternating current can induce voltage because it has a

Question # 28

A diode characteristic curve is a plot between

Question # 29

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

Question # 30

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

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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 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
3 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
4 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
5 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
6 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
7 The value of the input resistance of OP-AMP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several maga ohms
8 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
9 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
10 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF

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