PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 Which circuit elements has two stable states and can be used to store information. Flip flop or latch Logic gate Oscillator Amplifier
2 An important property of an ideal power supply is. Infinite internal resistance Zero internal resistance Large output resistance Small output resistance
3 Choose the one which acts as single inverter. Common emitter common collector Common base Diode
4 An oscillator is basically an amplifier with loop gain Zero Less than unity More than unity Infinity
5 Why is a capacitor resistor combination used in oscillators in grid circuit. To generate oscillation To bias the grid automatically To amplify oscillations To sustain the oscillations.
6 Transistor stands for Transfer of resistance Transfer of current Transfer of power Transfer of voltage
7 Transistor are made from Plastics Metals Insulators Doped semiconductors
8 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
9 How positives feedback will effect an amplifier. Increases the voltage gain Decreases the voltage gain Imitates oscillation to occur Damaged it
10 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
11 Emitter follower amplifier is an example of. Current series feedback Voltage series feedback Current shunt feed back Voltage shunt feedback
12 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
13 Low frequency response of an amplifier is mainly limited by. Biasing configuration Coupling capacitor By pass capacitor Input impedance
14 Current gain of a CE amplifier is 50, ITS hfe is about 25 50 75 100
15 Which configuration is used to connect high impedance source to a low impedance lead. CE CB CC BE
16 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
17 The input exultation for a JFET is Current signal Voltage signal Voltage and current signals Neither voltage nor current signal
18 Which type of amplifier causes minimum drain of power supply. Class -A Class -B Class-C Class -AB
19 The input resistance of a JFET is of the order of. 1 M Mega 10 M Mega 100 M Mega 1,000 M Mega
20 A logic circuit whose output signal is '1' when inputs are different is. NAND gate NOR gate Exclusive OR gate Exclusive NOR gate
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