Question

For NMOS transistor which of the following is not true?

(a) The substrate is of p-type semiconductor

(b) Inversion layer or induced channel is of n type

(c) Threshold voltage is negative

(d) None of the mentioned

This question was addressed to me in an international level competition.

This interesting question is from MOSFETs Device Strucuture and Physical Operation in section MOS Field Effect Transistors (MOSFETs) of Electronic Devices & Circuits

Answer 1

Correct answer is (c) Threshold voltage is negative

Best explanation: The threshold voltage is positive for NMOS.