List of top Physics Questions on Semiconductor electronics: materials, devices and simple circuits asked in NEET (UG), VITEEE

A semiconducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be

To obtain a $p$-type germanium semiconductor, it must be doped with

When npn transistor is used as an amplifier, then

Diamond is very hard because

A piece of copper and other of germanium are cooled from the room temperature to 80 K, then

p-n junction is said to be forward biased, when

At absolute zero, Si acts as