Q41. Choose the logic gate represented by the following combination of logic gates.
A
У1
y
B
У2
(a)

Q: What is the correct answer for CUET UG Physics Q41?

The correct answer is c. The given logic circuit diagram shows two NAND gates with their inputs tied together, which effectively act as NOT gates (inverters). Let the inputs be A and B. The first NAND gate with input A produces an output Y1 = A' (NOT A). The second NAND gate with input B produces an output Y2 = B' (NOT B). These two outputs (A' and B') are then fed as inputs into a third NAND gate. The final output 'y' of

Q: Q41. Choose the logic gate represented by the following combination of logic gates. A У1 y B У2 (a) NOR (b) NAND (c) AND (d) OR

The correct answer is c. The given logic circuit diagram shows two NAND gates with their inputs tied together, which effectively act as NOT gates (inverters). Let the inputs be A and B. The first NAND gate with input A produces an output Y1 = A' (NOT A). The second NAND gate with input B produces an output Y2 = B' (NOT B). These two outputs (A' and B') are then fed as inputs into a third NAND gate. The final output 'y' of

Q: What are the options for this CUET UG Physics question?

A. NOR · B. NAND · C. AND · D. OR

Question

Q41. Choose the logic gate represented by the following combination of logic gates.
A
У1
y
B
У2
(a) NOR
(b) NAND
(c) AND
(d) OR

FirstInTest · Accepted Answer

The given logic circuit diagram shows two NAND gates with their inputs tied together, which effectively act as NOT gates (inverters). Let the inputs be A and B. The first NAND gate with input A produces an output Y1 = A' (NOT A). The second NAND gate with input B produces an output Y2 = B' (NOT B). These two outputs (A' and B') are then fed as inputs into a third NAND gate. The final output 'y' of this third NAND gate will be y = (A' ⋅ B')'. By applying De Morgan's theorem, (A' ⋅ B')' = A'' + B'' = A + B. This Boolean expression A + B represents an OR gate. Therefore, the combination of logic gates shown represents an OR gate, which is option (d). However, the provided solution states that the correct answer is option (c), implying the circuit represents an AND gate. An AND gate (A ⋅ B) would typically be constructed by feeding the inputs A and B into a NAND gate to get (A ⋅ B)', and then feeding this output into another NAND gate acting as a NOT gate to obtain ((A ⋅ B)')' = A ⋅ B. The given circuit clearly does not produce an AND gate output.

Answer

NOR

Answer

NAND

Answer

AND

Answer

OR

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