PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 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
2 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
3 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
4 The value of open loop gain for the amplifier is zero very low very high of an intermediate vaue
5 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
6 A unijunction transistor Has only one junction Is a two terminal device Is fabricated from germanium Is fabricated fromuranium
7 Push pull amplifiers employ One transistor Two transistors Three transistors Four transistors
8 Which BJT configurations used for signal inversion. CE CC CB BE
9 Negative feedback Increases stability Decreases stability Produces oscillatory Cannot occur
10 The advantage of electron tube over a transistor is. Its high efficiency Its high gain Low consumption of power Low input impedance
11 There are how many modes of operations of a BJT. 2 3 4 5
12 Which one the following is not a component of a Bipolar junction Transistor Base Emitter Collector Grid
13 As oscillator is basically an amplifier with loop gain Zero Infinity Less than unity More than unity
14 What is the overall gain, if three amplifiers each with a gain of 30 are cacaded. 30 90 270 27,000
15 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
16 An operational amplifier can be used as a Comparator Night switch Inverting and non inverting amplifier All of the above
17 The resistance between(+) and (-) inputs of an amplifier is. Zero Low High Infinity
18 An operational amplifier have how many input terminals. One Two Three Four
19 When transistor works as an amplifier, its output is. More Less Zero Directly proportional to the input
20 A complete amplifier circuit made on a silicon chip and enclosed in a small capsule is Inductor Metal detector Diode Operational amplifier
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