The logic gates represented in Figure 1 is called 

Use the logic gate in Fig 2 to answer question 12.

Which of the logic gates will give an output opposite to the input state?

Use the logic gate in Fig 2 to answer question 13.

Which of the following statements is true about logic gates X and Y?

The logical equation for the logic circuit in Figure 3 is

The operation of a computer and peripherals attached to it is controlled by