Physics MCQs

Page No. 7

The alternating voltage is an example of_______________?


a A digital waveform


bAn analogue waveform


cDiscrete waveform


dNone at all


View Answer An analogue waveform

The device used for conversion of D.C. to A.C. is called______________?


aConverter


bA rectifier


c Inverter


dOscillator


View Answer Inverter

In half-wave rectification the output D.C. voltages is obtained across the load for_______________?


aThe negative half cycle of A.C.


bThe positive half cycle of A.C.


cThe positive and negative half cycles


dEither positive or negative half of A.C.



In full wave rectification the output D.C. voltage across the load is obtained for_____________?


aThe positive half cycle of input A.C.


bThe negative half cycle of input A.C.


cThe complete cycle of input A.C.


dAll of the above.



In the transistor schematic symbol, the arrow______________?


ais located on the emitter


bis located on the base


c is locate on the collector


d points form north to south



Which one of the following is not a donor impurity ?


aantimony


bphosphorus


caluminium


darsenic


View Answer aluminium

Forward current through a semi conductor diode circuit is due to____________?


aminority carriers


bmajority carriers


choles


delectron


View Answer majority carriers

The value of resistivity for insulator is of the order of____________?


a105 ohm metre


b106 ohm metre


c107 ohm metre


d108 ohm metre


View Answer 108 ohm metre

Which one of following band is completely filled in case of conductors ?


aConduction band


b Fermi band


cValence band


dForbidden band


View Answer Conduction band

Depletion region of a junction is formed_____________?


aduring the manufacturing process


bunder forward bias


cunder reverse bias


dwhen temperature varies



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