PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 Transistors with various combinations are widely used as switches in. electric generators Rectificers Amplifiers Computers
2 The SI unit of current gain is. Ampere Ampere metre Ampere volt It has no unit
3 What is the basic advantage of class A operation of an amplifier. It has high efficiency It has high gain It has low distortion It has high distortion
4 Which of the following is the most commonly used regions of operations for a transistor. Cut off Saturation Active All of these
5 Which of the following is basic transistor configuration. CB CC CE All of these
6 In CC configuration voltage gain is. Less than one More than one One Zero
7 In CE amplifier phased reversal occurs when the output voltage is taken between Base and collector Base and emitter Collector and emitter None of the terminals
8 If the base emitter junction is forward biased and base collector junction is reverse biased the BJT is in. cut of mode Amplification mode Saturation mode Inversion mode
9 The decimal equivalent of 1111 is 5 10 15 120
10 The binary equivalent of 25 is 111001 11001 1001 10101
11 An AND gate is. Equivalent to a series switching circuit. Equivalent to a parallel switching circuit Equivalent ot universal gate A reciprocal of NAND gate
12 The output of two input OR gate is zero only when its. Either input is one Either input is zero Both inputs are zero Both inputs are one
13 NOR gate is a combination of. OR gate and NOT gate OR gate and AND gate OR gate and OR gate NOT gate and AND gate
14 If we use two diodes and a centre tapped transformer we eill get Transistor Amplifier Half wave rectifier Full wave rectifier
15 A transistor can be used as Oscillator Amplifier Switch Both a and c
16 For the normal operation of transistor the emitter base junction is always. Zero biased Reverse biased Forward bised Both a and b
17 A transistor consists of. One p-n junction Two p-n junctions Three p-n junctions Four p-n junction
18 Which one among these contacts in a transistor is non rectifying. Base Emitter Collector None of these
19 In a transistor which one is very thin. Collector Emitter Base Depletion region
20 In n-p-n transistor the current flows in the direction from Emitter to base emitter to collector Base to emitter Base to collector
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