Cellular Telephone - Marvel EDU

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Practice Listening: Multiple Choice, Single Answer ID: #41031 Short Cellular Telephone

Instructions ›

You will see a video explaining how cellular telephone transmission works. Listen to the recording and answer the multiple-choice question by selecting the correct response. Only one response is correct.

Transcript:

Unlike ordinary phones, which connect to the network by wire, a cellular telephone connects with the network by radio waves. A cellular telephone is actually a radio transmitter and receiver. These phones work with a network of low powered radio antennas and transmitters. Each station serves a geographical area called a cell. When an antenna receives radio signals from a cellular telephone, it sends them to a switching office, which in turn sends them by cable into the ordinary telephone network. The call is then routed to its destination. When a person in a moving car uses a cellular telephone, the antenna in the nearest cell handles the radio signals. As the car moves, the signals pass to the next cell without interrupting the call.

How does a cellular telephone maintain a continuous call while moving between geographical areas?

* Listen to the recording and select the correct answer

By increasing the power of the radio signals. By connecting to the nearest wired network. By passing the radio signals to the next cell. By storing the call data until the connection improves.

Result:

AI explanationShows the answer. Tap to open.

Option 3: "By passing the radio signals to the next cell."

Explanation: This option is correct because the text explicitly states that as a person in a moving car uses a cellular telephone, the signals pass to the next cell without interrupting the call. This process of transferring signals between cells is essential for maintaining a continuous call while moving.

Option 1: "By increasing the power of the radio signals."

Explanation: This option is incorrect because the text does not mention increasing the power of radio signals as a method for maintaining a call. Instead, it describes how cellular telephones operate through a network of low-powered antennas and transmitters, which indicates that power increase is not necessary for call continuity.

Option 2: "By connecting to the nearest wired network."

Explanation: This option is incorrect as the text specifies that cellular telephones connect to the network via radio waves, not by connecting to a wired network. The process described involves radio signals being sent to a switching office, which then connects to the ordinary telephone network, but does not imply a direct connection to a wired network.

Option 4: "By storing the call data until the connection improves."

Explanation: This option is incorrect because the text does not mention storing call data as a method for maintaining a call. Instead, it emphasizes the seamless transition of signals from one cell to another, which allows for uninterrupted communication while moving.

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