Light Emitting Diode (LED) work on principle of

Who discovered the concept of blackbody radiation

An SCR behaves as a ___ switch

A _____mirror always forms an erect image of the object

Transistor is a ______device

The device in which negative feedback is used is

 The purpose of choke in tube light is ___

Sound travels at the fastest speed in____

Select the Scalar Quantity _____

Nuclear sizes are expressed in a unit named ______