Answer: NAND gate.
- A NAND gate
- B OR gate
- C NOT gate
- D AND gate
Correct answer: A. NAND gate
Explanation: The NAND gate (like NOR) can be combined to make any other logic gate, so it is universal.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.