The transition temperature of mercury is
1.14’K
9.22°K
18.0°K
4.12°K
4.12°K
By increasing impurity content in the metal alloy the residual resistivity always
decreases
remains constant
increases
becomes temperature independent
increases
The structure sensitive property of a super conductor is
critical current density
none of the above
transition temperature
critical magnetic field
critical current density
In thermocouples which of the following pairs is commonly used ?
Copper-constantan
Silver-German silver
Aluminium-tin
Iron-steel
Copper-constantan
______ is an example of piezoelectric material.
Neoprene
Quartz
Glass
Corrundum
Quartz
_____ is the main constituent of glass
Si02
Fe203
AI2O3
B2O3
Si02
Solder is an alloy of
silver copper and lead
nickel copper and zinc
copper and aluminium
tin and lead
tin and lead
_____ is most commonly used for making magnetic recording tape
Silver nitrate
Small particles of iron
Ferric oxide
Silicon-iron
Ferric oxide
Overhead telephone wires are made of
steel
copper
ACSR conductors
aluminium
steel
Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
Nichrome
Kanthal
Constantan
Molybdenum
Nichrome
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