How Cellphone Works Quiz

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Welcome BSET 2nd Year Students to our 4th Online Short Quiz in ELS 24-Electronics Workshop Practice 2. Let us see and test how far did you understand the topics/lessons which had been discussed this past few weeks. Before taking the quiz, kindly consider watching this video to fully understand how does a cell phone works as one of the convenient medium of communication. You may also add your insights about what have transpired after watching the video by posting your comments below. This Multiple Choice quiz is only good for 10 minutes. You only have one attempt to take the Read moreexam so make the best out of it. Good Luck!


Questions and Answers
  • 1. 

    It separates the spectrum into distinct voice channels by splitting it into uniform chunks of bandwidth.

    • A.

      CDMA

    • B.

      FDMA

    • C.

      TDMA

    • D.

      PDMA

    Correct Answer
    B. FDMA
    Explanation
    FDMA separates the spectrum into distinct voice channels by splitting it into uniform chunks of bandwidth. To better understand FDMA, think of radio stations: Each station sends its signal at a different frequency within the available band. FDMA is used mainly for analog transmission. While it is certainly capable of carrying digital information, FDMA is not considered to be an efficient method for digital transmission.

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  • 2. 

    The first company to produce a handheld mobile phone.

    • A.

      Nokia

    • B.

      Motorola

    • C.

      Samsung

    • D.

      Apple

    Correct Answer
    B. Motorola
    Explanation
    On 3 April 1973 when Martin Cooper, a Motorola researcher and executive, made the first mobile telephone call from handheld subscriber equipment, placing a call to Dr. Joel S. Engel of Bell Labs.

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  • 3. 

    The first mobile phone ever made invented by Martin Cooper on April 3, 1973.

    • A.

      Nokia 1011

    • B.

      Samsung SC-1000

    • C.

      Motorola DynaTAC 8000x

    • D.

      Orbitel 901

    Correct Answer
    C. Motorola DynaTAC 8000x
    Explanation
    The Motorola DynaTAC 8000X commercial portable cellular phone received approval from the U.S. FCC on September 21, 1983.[1] A full charge took roughly 10 hours, and it offered 30 minutes of talk time.[2] It also offered an LED display for dialing or recall of one of 30 phone numbers. It was priced at $3,995 in 1984, its commercial release year, worth a modern-day price of nearly $10,000. DynaTAC was an abbreviation of "Dynamic Adaptive Total Area Coverage."

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  • 4. 

    It pertains to device where both transmitters use the same frequency but only one party can talk at a time.

    • A.

      Half-duplex

    • B.

      Full-duplex

    • C.

      Transceiver

    • D.

      Transmitter

    Correct Answer
    A. Half-duplex
    Explanation
    Both walkie-talkies and CB radios are half-duplex devices. That is, two people communicating on a CB radio use the same frequency, so only one person can talk at a time.

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  • 5. 

    A unique 32-bit number programmed into the phone when it is manufactured

    • A.

      Electronic Serial Number

    • B.

      Mobile Identification Number

    • C.

      System Identification Code

    • D.

      Roaming Number

    Correct Answer
    A. Electronic Serial Number
    Explanation
    The correct answer is Electronic Serial Number. The explanation is that a unique 32-bit number is programmed into the phone when it is manufactured, and this number is known as the Electronic Serial Number. It serves as a unique identifier for the phone and is used for various purposes such as tracking, authentication, and activation of the device.

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  • 6. 

    Central office that  handles all of the phone connections to the normal land-based phone system and controls all of the base stations in the region.

    • A.

      Mobile Telecom Switching Office

    • B.

      Mobile Telephone Sending Office

    • C.

      Mobile Transmitting and Switching Office

    • D.

      Mobile Telephone Switching Office

    Correct Answer
    D. Mobile Telephone Switching Office
    Explanation
    A typical large city can have hundreds of towers. But because so many people are using cell phones, costs remain low per user. Each carrier in each city also runs one central office called the Mobile Telephone Switching Office (MTSO). This office handles all of the phone connections to the normal land-based phone system and controls all of the base stations in the region.

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  • 7. 

    A 10-digit number derived from your phone's number

    • A.

      Electronic Serial Number

    • B.

      Mobile Identification Number

    • C.

      System Identification Code

    • D.

      Roaming Number

    Correct Answer
    B. Mobile Identification Number
    Explanation
    The Mobile Identification Number (MIN) is a 10-digit number that is derived from your phone's number. It is a unique identifier assigned to mobile devices, allowing them to be recognized and authenticated on a cellular network. The MIN is used for various purposes such as routing calls, tracking usage, and identifying the device for billing and security purposes.

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  • 8. 

    A unique 15-bit number that is assigned to each carrier by the Federal Communications Commission (FCC)

    • A.

      Electronic Serial Number

    • B.

      Mobile Identification Number

    • C.

      System Identification Code

    • D.

      Roaming Number

    Correct Answer
    C. System Identification Code
    Explanation
    The correct answer is System Identification Code. The System Identification Code is a unique 15-bit number that is assigned to each carrier by the Federal Communications Commission (FCC). It is used to identify and differentiate carriers within the telecommunications network. The System Identification Code helps in managing and regulating the communication services provided by different carriers.

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  • 9. 

    A cell phone standard that uses a range of frequencies between 824 megahertz (MHz) and 894 MHz for analog cell phones. 

    • A.

      Amplified Mobile Phone System

    • B.

      Advanced Mobile Phone Service

    • C.

      Alternative Mobile Phone System

    • D.

      Advanced Mobile Phone System

    Correct Answer
    D. Advanced Mobile Phone System
    Explanation
    Old school: DynaTAC cell phone, 1983
    PHOTO COURTESY MOTOROLA, INC.
    In 1983, the analog cell phone standard called AMPS (Advanced Mobile Phone System) was approved by the U.S. Federal Communications Commission (FCC) and first used in Chicago. AMPS uses a range of frequencies between 824 megahertz (MHz) and 894 MHz for analog cell phones. In order to encourage competition and keep prices low, the U. S. government required the presence of two carriers in every market, known as A and B carriers. One of the carriers was normally the local-exchange carrier (LEC), a fancy way of saying the local phone company.

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  • 10. 

    A version of AMPS which incorporates some digital technology to allow the system to carry about three times as many calls as the original version. 

    • A.

      Narrowband Amplitude Mobile Phone Service

    • B.

      Network band Advanced Mobile Phone Service

    • C.

      Narrowband Advanced Mobile Phone Service

    • D.

      Nanoband Advanced Mobile Phone Service

    Correct Answer
    C. Narrowband Advanced Mobile Phone Service
    Explanation
    A version of AMPS known as Narrowband Advanced Mobile Phone Service (NAMPS) incorporates some digital technology to allow the system to carry about three times as many calls as the original version. Even though it uses digital technology, it is still considered analog. AMPS and NAMPS only operate in the 800-MHz band and don't offer many of the features common in digital cellular service, such as e-mail and Web browsing.

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  • 11. 

    A process of  using two frequencies, one for binary ( 1s and the other for 0s), alternating rapidly between the two to send digital information between the cell tower and the phone. 

    • A.

      Frequency Service Keeping

    • B.

      Frequency Shift Keying

    • C.

      Frequency Shift Keeping

    • D.

      Frequency Service Keying

    Correct Answer
    B. Frequency Shift Keying
    Explanation
    Many digital cellular systems rely on frequency-shift keying (FSK) to send data back and forth over AMPS. FSK uses two frequencies, one for 1s and the other for 0s, alternating rapidly between the two to send digital information between the cell tower and the phone. Clever modulation and encoding schemes are required to convert the analog information to digital, compress it and convert it back again while maintaining an acceptable level of voice quality. All of this means that digital cell phones have to contain a lot of processing power.

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  • 12. 

    A highly customized processor designed to perform signal-manipulation calculations at high speed for cellphones.

    • A.

      Digital Signal Processor

    • B.

      Digital System Processor

    • C.

      Digital Servicel Processor

    • D.

      Direct Signal Processor

    Correct Answer
    A. Digital Signal Processor
    Explanation
    A Digital Signal Processor (DSP) is a highly specialized processor designed specifically for performing signal manipulation calculations at high speed. It is commonly used in cellphones and other devices that require real-time processing of audio, video, and other signals. DSPs are optimized for tasks such as filtering, encoding, decoding, and compressing signals, making them ideal for applications where fast and efficient signal processing is necessary.

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  • 13. 

    An access method that  uses a narrow band that is 30 kHz wide and 6.7 milliseconds long is split time-wise into three time slots.

    • A.

      CDMA

    • B.

      FDMA

    • C.

      TDMA

    • D.

      PDMA

    Correct Answer
    C. TDMA
    Explanation
    TDMA is the access method used by the Electronics Industry Alliance and the Telecommunications Industry Association for Interim Standard 54 (IS-54) and Interim Standard 136 (IS-136). Using TDMA, a narrow band that is 30 kHz wide and 6.7 milliseconds long is split time-wise into three time slots.

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  • 14. 

    After digitizing data, it spreads it out over the entire available bandwidth. 

    • A.

      CDMA

    • B.

      FDMA

    • C.

      TDMA

    • D.

      PDMA

    Correct Answer
    A. CDMA
    Explanation
    CDMA takes an entirely different approach from TDMA. CDMA, after digitizing data, spreads it out over the entire available bandwidth. Multiple calls are overlaid on each other on the channel, with each assigned a unique sequence code. CDMA is a form of spread spectrum, which simply means that data is sent in small pieces over a number of the discrete frequencies available for use at any time in the specified range. Verizon, Sprint and most other U.S. carriers use CDMA, which means no SIM card.

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  • 15. 

    A standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile phones, become the default global standard for mobile communications.

    • A.

      Global System for Mobile Communications

    • B.

      Global Standard for Mobile Communications

    • C.

      Global Satellite for Mobile Communications

    • D.

      Global Standard for Mobile Channels

    Correct Answer
    A. Global System for Mobile Communications
    Explanation
    GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile phones, first deployed in Finland in July 1991.As of 2014 it has become the default global standard for mobile communications - with over 90% market share, operating in over 219 countries and territories

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  • 16. 

    The cellular phone got  its name from ___________

    • A.

      The division of graphic area into cells

    • B.

      Cellular membrane technology

    • C.

      The grouping of different frequencies

    • D.

      The transmission of data/radio waves to a receiving handheld device

    Correct Answer
    A. The division of graphic area into cells
    Explanation
    You might imagine the cell phone network as blanket of radio waves spread over a large region. It's really more like a quilt made of small, hexagonal areas called cells. Each cell has its own tower and base station.

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  • 17. 

    The range served by each cell phone base station is about _____________

    • A.

      5 square miles (13 square kilometers)

    • B.

      10 square miles (26 square kilometers)

    • C.

      25 square miles (65 square kilometers)

    • D.

      50 square miles (100 square kilometers)

    Correct Answer
    C. 25 square miles (65 square kilometers)
    Explanation
    The signals from each tower don't travel far beyond their range of 10 square miles. This means that cellular providers can use the same frequencies over and over in different cells, so more people can talk at the same time.
    25 square miles (65 square kilometers)

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  • 18. 

    How do digital phones let more people within a cell talk at once?

    • A.

      They transfer data quicker, so the frequencies aren't clogged.

    • B.

      They convert voices into binary code, compressing the calls.

    • C.

      They use higher frequencies than analog phones.

    • D.

      They used variety of frequencies and the cellphone system selects one channel to talk at once

    Correct Answer
    B. They convert voices into binary code, compressing the calls.
    Explanation
    If you're talking on a digital phone over a digital network, your voice becomes a stream of 1s and 0s. These 1s and 0s take up a lot less room than an analog signal, which is a constantly varying wave of information.

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  • 19. 

    A locked phone __________________

    • A.

      Can work with only one specific provider's service

    • B.

      Can work only in a limited range within a network

    • C.

      Can work with different service provider and unlimited range of network

    • D.

      Has no SIM card

    Correct Answer
    A. Can work with only one specific provider's service
    Explanation
    When the Apple iPhone hit the market, it was a locked phone -- it worked only with AT&T service. But inventive users quickly found hacks that could bypass the lock, making their phones usable on other networks.

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  • 20. 

    It provides storage for the phone's operating system and customizable features, such as the phone directory

    • A.

      Microprocessor

    • B.

      ROM

    • C.

      RAM

    • D.

      Display

    Correct Answer
    B. ROM
    Explanation
    ROM stands for Read-Only Memory, which is a type of storage in a computer or electronic device that permanently stores data. In the context of a phone, ROM provides storage for the phone's operating system and customizable features, such as the phone directory. Unlike RAM (Random Access Memory), ROM retains its data even when the device is powered off. This allows the phone to boot up and run essential functions smoothly. Therefore, ROM is the correct answer as it explains the storage function of the phone's operating system and customizable features.

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