PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 Transistor are made from Plastics Metals Insulators Doped semiconductors
2 The advantage of electron tube over semiconductor is. <sub>its efficiency</sub> its unlimited type Its low consumption power That it takes no warming up time
3 How positives feedback will effect an amplifier. Increases the voltage gain Decreases the voltage gain Imitates oscillation to occur Damaged it
4 A darling ion amplifier is characterized by High voltage and current gain High input resistance and current gain High output resistant and current gain Low input resistance and current gain
5 Emitter follower amplifier is an example of. Current series feedback Voltage series feedback Current shunt feed back Voltage shunt feedback
6 A CE amplifier with by passed emitter resistor is an example of. Current series feedback Voltage sires feed back Current shunt feedback Voltage shunt feed back
7 Low frequency response of an amplifier is mainly limited by. Biasing configuration Coupling capacitor By pass capacitor Input impedance
8 Current gain of a CE amplifier is 50, ITS hfe is about 25 50 75 100
9 Which configuration is used to connect high impedance source to a low impedance lead. CE CB CC BE
10 The band width of an audio amplifier is. 10 Hz to 10 kHz 20 Hz to 54 Hz 20 Hz to 20 kHz 20 Hz to 60 kHz
11 The input exultation for a JFET is Current signal Voltage signal Voltage and current signals Neither voltage nor current signal
12 Which type of amplifier causes minimum drain of power supply. Class -A Class -B Class-C Class -AB
13 The input resistance of a JFET is of the order of. 1 M Mega 10 M Mega 100 M Mega 1,000 M Mega
14 A logic circuit whose output signal is '1' when inputs are different is. NAND gate NOR gate Exclusive OR gate Exclusive NOR gate
15 A logic circuit with one input and one output that inverts the input signal at the output is. AND gate NOT gate OR gate NOR gate
16 Usually in an operational amplifier the inputs used are of Equal voltage and same polarity Equal voltage and opposite polarity Different voltage and same polarity Different voltage and opposite polarity
17 the gain of an amplifier is independent of The two externally connected resistances What is happening inside the amplifier Internal structure of the amplifier All of the above
18 The value of open loop gain for the amplifier is zero very low very high of an intermediate vaue
19 An operational amplifiers will act as an inverting amplifier when the input signal is connected to. Inverting terminal Non inverting terminal Earthened wire Both a and b
20 A unijunction transistor Has only one junction Is a two terminal device Is fabricated from germanium Is fabricated fromuranium
21 Push pull amplifiers employ One transistor Two transistors Three transistors Four transistors
22 Which BJT configurations used for signal inversion. CE CC CB BE
23 Negative feedback Increases stability Decreases stability Produces oscillatory Cannot occur
24 The advantage of electron tube over a transistor is. Its high efficiency Its high gain Low consumption of power Low input impedance
25 There are how many modes of operations of a BJT. 2 3 4 5
26 Which one the following is not a component of a Bipolar junction Transistor Base Emitter Collector Grid
27 As oscillator is basically an amplifier with loop gain Zero Infinity Less than unity More than unity
28 What is the overall gain, if three amplifiers each with a gain of 30 are cacaded. 30 90 270 27,000
29 Why transistor is preferred to triode valve for use as an amplifier. Because it can handle large power Because it has higher input impedance Because it has higher voltage gain Because it has lower voltage gain
30 An operational amplifier can be used as a Comparator Night switch Inverting and non inverting amplifier All of the above
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