1 ) A conducting wire is drawn to double its length . Final resistivity of material will be : -
A ) increased , B ) decreased ,
C ) no change , D ) None of these ,
Correct Answer : - C ) no change ,
So resistivity will remain Same . It is property of wire does not depend on its length , mass or cross - sectional area .
2 ) The resistance of an incandescent lamp . . . . . . . . . . . when switched on .
A ) increases , B ) decreases ,
C ) no change , D ) None of these ,
Correct Answer : - A ) increases ,
3 ) . . . . . . . . . . are usually made of metal oxides with temperature coefficient of resistivity .
A ) Thermistors , B ) Amplifiers ,
C ) Diodes , D ) None of these ,
Correct Answer : - A ) Thermistors ,
4 ) Current provided by a battery is maximum , when internal resistance is . . . . . . . . . . external resistance .
A ) greater than , B ) lesser than ,
C ) equal to , D ) None of these ,
Correct Answer : - C ) equal to ,
5 ) . . . . . . . . . is an arrangement of two different metals to convert heat energy into electrical energy .
A ) Thermistor , B ) Thermocouple ,
C ) Capacitor , D ) None of these ,
Correct Answer : - B ) Thermocouple ,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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