Digital Electronics
The NOR gate can function as a NOT gate if

 one input is set to 1
 all inputs are connected together
 inputs are left open
 one input is set to 0

ANSWER DOWNLOAD EXAMIANS APP

Digital Electronics
2421 code is

 weighted non-self-complementing code
 non-weighted and non-self-complementing code
 non-weighted self-complementing code
 weighted self-complementing code

ANSWER DOWNLOAD EXAMIANS APP