1. Explain why the red box has an output of a 0?

2. When creating a truth table for logic gates it is important to test for all possible inputs. What do you notice about the inputs in red?

3. What is the output C? What goes in the question mark?

4. Read the excerpt below, examining the circuit and truth table, and fill in the blanks.

5. For the following circuit, if the inputs for A, B and C are all zero (0), what is the output at X?

6. Which statement from the following options is true about this diagram?

7. A burglar has entered via one of the windows. The output at '?' would be 0, the system does not work and the alarm would NOT sound.

8. If the inputs for A, B and C are all 1, what is the final output (X)?

9. If the inputs for A, B and C are all 0, what is the final output (X)?

10. If the inputs for A, B and C are all 1, what is the final output (X)?