For the following questions answer them individually
In an electric heater, the metal case is connected to .............
Which of the following is not an indoor lighting ?
Carbon arc lamps are commonly used in .......
Lumen/watt is the unit of ............
Arc can be produced by ?
A rectifier for welding has voltage/current characteristics as ...............
The insulating material suitable for low temperature applications is ..............
The method suitable for heating of conducting medium is .............
The numberof valence electron in boron is ...........
The potential barrier acts as a barrier against the flow of. ............