Which of the following is the poorest conductor of electricity ?
Carbon
Aluminium
Silver
Steel
Carbon
______ has zero temperature co-efficient of resistance.
Manganin
Carbon
Aluminium
Porcelain
Manganin
At transition temperature the value of critical field is
complex value
zero
negative real value
positive real value
zero
Piezoelectric materials serve as a source of _____ .
ultrasonic waves
resonant waves
musical waves
microwaves
ultrasonic waves
Which of the following material is not a semiconductor ?
Gallium-arsenide
Selenium
Germanium
Silica
Silica
Which of the following are non-conductors of electricity?
Non-metal solids except carbon
Air and most other gases
All of the above
Pure water and liquids in general except mercury
All of the above
Steel wire is used as
all of the above
core wire of ACSR
earth wire
overhead telephone wire
all of the above
Which of the following materials is used for making coils of standard resistances ?
Manganin
Nichrome
Copper
Platinum
Manganin
is the property of absorbing moisture from atmosphere.
Porosity
Hygroscopicity
Solubility
Viscosity
Hygroscopicity
Which of the following is a semiconductor material ?
Silicon
Phosphorous
Rubber
Aluminium
Silicon
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