A student has been given a task by his/ her teacher to make a security alarm for passengers' luggage. The MOST suitable logic gate used by the student will be
Correct answer: A. XOR gate
- A. XOR gate
- B. NOR gate
- C. XNOR gate
- D. NAND gate
Explanation
The most suitable logic gate for a security alarm intended to detect changes or tampering with luggage is the XOR gate. This gate outputs a true signal when its inputs differ, which is ideal for signaling when a condition has changed, such as when luggage is moved or opened. Other gates like NOR, XNOR, and NAND do not provide this functionality as effectively: the NOR gate outputs true only when all inputs are false, the XNOR gate outputs true when inputs are the same, and the NAND gate outputs false only when all inputs are true. These characteristics do not align with the need to detect differences or changes in state.
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A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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