If any one input is HIGH (or 1), and output is also HIGH (or 1), such Gate is:

Which one of the following is not a semiconductor?

Which one of the following metals is used as semiconductor in transistors?

Solar cell is a device that converts light energy into electrical energy. We obtain the highest output of energy during noon when the sun is just above our head, because

Which one of the following element is used in solar cells?

Which of the following diode is used in ultra-high speed switching electronic circuits?