UGC-NET Computer Science July 2016 Solved Paper 2

UGC-NET Computer Science July 2016 Solved Paper 2


Q:: 6  Which of the following logic expressions is incorrect ?
(1) 1 ⊕ 0 = 1
(2) 1 ⊕ 1 ⊕ 1 = 1
(3) 1 ⊕ 1 ⊕ 0 = 1
(4) 1 ⊕ 1 = 0

Answer:: (3)

Explanation::

The symbol  ⊕  stands for X-OR gate. X-OR gives output as 1 when only one of the two inputs are supplied as 1 otherwise 0.

A     B      A⊕B
0      0          0
0      1          1
1      0          1
1      1          0

 So, on inspecting option (3) produce 1 ⊕ 1 ⊕ 0 = 0 ⊕ 0 = 0.
 Hence it is incorrect. All others are correct.

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