Commonly used conducting materials are_____________?

A. copper
B. aluminium
C. both (A) and (B)
D. copper and silver
E. platinum and gold

Superconducting metal in super conducting state has relative permeability of________________?
A. zero B. one C. negative D. more than one...
___________ is most commonly used for making magnetic recording tape?
A. Silver nitrate B. Ferric oxide C. Small particles of iron D. Silicon-iron...
In thermocouples which of the following pairs is commonly used ?
A. Copper-constantan B. Aluminium-tin C. Silver-German silver D. Iron-steel...
High resistivity materials are used in_____________?
A. precision instruments B. heating elements C. motor starters D. incandescent lamps E. all of the above...
Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
A. Nichrome B. Constantan C. Kanthal D. Molybdenum...
Piezoelectric materials serve as a source of ____________ ?
A. resonant waves B. musical waves C. microwaves D. ultrasonic waves...
Which of the following materials does not have covalent bonds ?
A. Organic polymers B. Silicon C. Metals...
Which of the following materials is the best conductor of electricity ?
A. Tungsten B. Aluminium C. Copper D. Carbon...
Low resistivity materials are used in__________?
A. transformer, motor and generator windings B. transmission and distribution lines C. house wiring D. all above applications...
Effect of moisture on the insulating materials is to________________?
A. decrease dielectric constant B. decrease dielectric strength C. decrease insulation resistance D. increase dielectric loss E. all of the above...