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

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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

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cComptons effect

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d Feed back effect

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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

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dstill under controversy

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View Answer free electrons

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


aOne

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bTwo

✓


cFour time

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dNone of these

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View Answer Two

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


a42Hz

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b7 Hz

✓


c256Hz

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d262Hz

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View Answer 7 Hz

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