The elements which become superconducting at extremely low temperatures are Ferromagnetic at room temperature Relatively poor conductors at room temperature Insulators at room temperature Good conductors at room temperature TRUE ANSWER : ? YOUR ANSWER : ?
Debye temperature of metals is About 200 K About 600 K About 2 K About 10 K TRUE ANSWER : ? YOUR ANSWER : ?
The most important set of specifications of transformer oil include flash point and viscosity viscosity and flash point dielectric strength and flash point dielectric strength and viscosity TRUE ANSWER : ? YOUR ANSWER : ?
Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied. True False TRUE ANSWER : ? YOUR ANSWER : ?
A characteristic property of crystal is its periodicity of structure. False True TRUE ANSWER : ? YOUR ANSWER : ?
When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability. False True TRUE ANSWER : ? YOUR ANSWER : ?
Spontaneous magnetisation is characteristic of ferromagnetic materials. False True TRUE ANSWER : ? YOUR ANSWER : ?
The merger of hole and free electron is called Thermal energy Covalent bonding Free electrons Recombination TRUE ANSWER : ? YOUR ANSWER : ?
With increase in temperature, the electrical conductivity would Decrease in metals but increase in intrinsic semiconductor Decrease in metals as well as in intrinsic semiconductor Increase in metals as well as in intrinsic semiconductor Increase in metals but decrease in intrinsic semiconductor TRUE ANSWER : ? YOUR ANSWER : ?
Which inductor is used at high frequencies? Iron alloy cored Sheet steel cored Cast iron cored Ceramic cored TRUE ANSWER : ? YOUR ANSWER : ?