A switch produces only On and Off states and is thus considered binary.

• A. True
• B. False
• C. Sometimes
• D. Always

Answer: (A)

Binary means a system can exist in exactly two distinct states. A switch that has only On and Off positions fits that idea perfectly, since there are just two possible outputs it can produce. In digital logic, these two states map to the basic 0/1 or false/true values, which is why this switch is considered binary. The other options don’t apply: saying it’s not binary contradicts the two-state nature; saying it’s sometimes binary implies variability that isn’t present here; and saying it’s always binary would overstate universality, whereas there are devices that can have more than two states, even though this particular switch does not.