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 ,
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. .
