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For the following questions answer them individually
Incandescent lamp is filled by
argon gas
oxygen gas
carbon di oxide
Sulphur oxide
In house wiring which type of insulation is used?
rubber
P.V.C
V.I.R
Paper
The unit of solid angle is
Solid angle
Radian
Steradian
Candela
In case of frosted GLS lamps, frosting of shell is done by_____.
Acid etching
ammonia
ozone
salt water
The resistance of arc
Decreases with increase of the current
Increases with increase of the current
Does not depend on current
None of these
For welding duty the rectifier commonly used are
Mercury arc rectifier
Selenium metal rectifier
Both Mercury arc rectifier and Selenium metal rectifier
The device necessarily used for automatic temperature control in a furnace is
Thermostat
Auto-transformer
Thermo-couple
Any of the options
The ideal method of heating plastics is
Coal/oil fired furnace
Dielectric heating
Induction heating
Resistance heating
Which of the following element belongs to the same group of periodic tables as that of silicon and lead?
Phosphorous
Carbon
Arsenic
Mercury
The merging of a free electron and a hole is known as
recombination
extrusion
absorption
adsorption
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