Cordless telephone system will not work under which of the following criteria?

Solution (By Examveda Team)

A cordless telephone system uses radio waves for communication between the handset and the base station. The range of these radio waves is limited.
Cordless telephones use short-range radio frequencies to communicate. This means there's a limited distance the handset can be from the base station before the signal becomes too weak to work effectively.
Option A: Within a home. Cordless phones are designed to work within a typical home. The range is usually sufficient to cover a house.
Option B: Within a building. Similar to a home, a cordless phone *could* work within a building, depending on the building size and construction materials which may interfere with the signal. Larger buildings or those with significant interference could cause problems.
Option C: Within campus. A campus is a significantly larger area than a home or building. The range of a cordless phone is not designed for such distances, and significant signal degradation and interference are highly likely.
Option D: Within a city. A city is even larger than a campus. The distance and interference from various sources (other wireless devices, buildings, etc.) would make a cordless phone completely impractical and unusable.
Therefore, the correct answer is Option D: Within a city, because the range of a cordless phone is far too limited for such a large and interference-prone environment.