WAEC - Computer Studies (2024 - No. 11)
Use the devices in Figures 1 and 2 to answer the questions given that the input variables X and Y have values of 0011 and 0101 respectively as shown in Table 1.
| X | Y |
|
0 0 1 1 |
0 1 0 1 |
If the input variable X in Figure 1 is passed through the device in Figure 2 before going into the logic gate in Figure 1, what will be the value of the output Z?
0111
1011
1101
1110
Explanation
D: (1110)
The gate in figure 2 is a NOT gate that inverse the input. It gives 1 when the input is 0 and vice-versa.
- For input X = 0011,
when it passes through the NOT gate, it becomes 1100
- For input Y = 0101,
When it passes through the NOT gate, it becomes 1010
| \(\overline{X}\) | \(\overline{Y}\) | Z |
|
1 1 0 0 |
1 0 1 0 |
1 1 1 0 |
Z = 1110
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