Physics MCQs

Page No. 66

Reciprocal of resistivity is called__________________?


aresistance


binductance


cconductivity


dflexibility


View Answer conductivity

Resistance of an ideal insulator is __________________?


ainfinite


bzero


cfinite


ddepends upon nature


View Answer infinite

An immersion heater of 400 watts kept on for 5 hours will consume electrical power of __________________?


a2KWh


b20KWh


c6KWh


d12KWh


View Answer 2KWh

Thermocouples convert___________________?


aheat energy into electrical energy


bheat energy into light energy


cheat energy into mechanical energy


dmechanical energy into heat energy



Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ?


a 40 W


b90W


c100W


d120W


View Answer 90W

Production of heat due to an electric current flowing through a conductor is given by _________________?


a Joule effect


bJoule Thomsons effect


cComptons effect


d Feed back effect


View Answer Joule effect

A wire having very high value of conductance is said to be____________________?


a very good conductor


bmoderately good conductor


can insulator


dno specific criterion available



The current through a metallic conductor is due to the motion of _________________? 0 A. free electrons


afree electrons


bprotons


cneutrons


dstill under controversy


View Answer free electrons

Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe?


aOne


bTwo


cFour time


dNone of these


View Answer Two

The beats frequency (sensible) for a human car is _____________________?


a42Hz


b7 Hz


c256Hz


d262Hz


View Answer 7 Hz

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