Logic Gates
A two-input logic gate gives an output of logic 1 only when both of its inputs are simultaneously at logic 1, and a student names this gate.
Select the correct option:
Solution
AND gate
NCERT introduces logic gates as the basic building blocks of digital electronics, each defined by a truth table relating outputs to inputs. The AND gate produces an output of logic 1 only when every input is at logic 1; if any input is 0, the output is 0. This matches the description exactly, since the gate outputs 1 solely when both inputs are simultaneously 1, expressed as Y=A⋅B. The OR gate is wrong because it outputs 1 when at least one input is 1, not only when both are, so it would give 1 for a single high input. The NOR gate is wrong because it is the inverse of OR and outputs 1 only when both inputs are 0, the opposite pattern. The NAND gate is wrong because it outputs 0 only when both inputs are 1 and 1 otherwise, again the complement of the required behaviour. As stated in NCERT Class 12, Chapter 14, the AND gate implements logical multiplication of its inputs. A consistency check confirms that testing the two inputs both at 1 gives output 1 while any other combination gives 0, uniquely identifying the AND gate.
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About This Question
- Subject
- physics
- Chapter
- electronic devices
- Topic
- logic gates
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
AND gate
NCERT introduces logic gates as the basic building blocks of digital electronics, each defined by a truth table relating outputs to inputs. The AND gate produces an output of logic 1 only when every input is at logic 1; if any input is 0, the output is 0. This matches the description exactly, since the gate outputs 1 solely when both inputs are simultaneously 1, expressed as Y=A⋅B. The OR gate is wrong because it outputs 1 when at least one input is 1, not only when both are, so it would give 1 for a single high input. The NOR gate is wrong because it is the inverse of OR and outputs 1 only when both inputs are 0, the opposite pattern. The NAND gate is wrong because it outputs 0 only when both inputs are 1 and 1 otherwise, again the complement of the required behaviour. As stated in NCERT Class 12, Chapter 14, the AND gate implements logical multiplication of its inputs. A consistency check confirms that testing the two inputs both at 1 gives output 1 while any other combination gives 0, uniquely identifying the AND gate.
This easy difficulty physics question is from the chapter electronic devices, covering the topic of logic gates. It appeared in the 2025 exam.
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