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.
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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