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  1. The physical layer concerns with:
  2. A.
    bit-by-bit delivery
    B.
    process to process delivery
    C.
    application to application delivery
    D.
    none of the mentioned

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  3. Which transmission media has the highest transmission speed in a network?
  4. A.
    coaxial cable
    B.
    twisted pair cable
    C.
    optical fiber
    D.
    electrical cable

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  5. Bits can be send over guided and unguided media as analog signal by:
  6. A.
    digital modulation
    B.
    amplitude modulation
    C.
    frequency modulation
    D.
    phase modulation

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  7. The portion of physical layer that interfaces with the media access control sublayer is called:
  8. A.
    physical signalling sublayer
    B.
    physical data sublayer
    C.
    physical address sublayer
    D.
    none of the mentioned

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  9. physical layer provides:
  10. A.
    mechanical specifications of electrical connectors and cables
    B.
    electrical specification of transmission line signal level
    C.
    specification for IR over optical fiber
    D.
    all of the mentioned

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  11. In asynchronous serial communication the physical layer provides:
  12. A.
    start and stop signalling
    B.
    flow control
    C.
    both (a) and (b)
    D.
    none of the mentioned

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  13. The physical layer is responsible for:
  14. A.
    line coding
    B.
    channel coding
    C.
    modulation
    D.
    all of the mentioned

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  15. The physical layer translates logical communication requests from the ______ into hardware specific operations.
  16. A.
    data link layer
    B.
    network layer
    C.
    trasnport layer
    D.
    application layer

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  17. A single channel is shared by multiple signals by:
  18. A.
    analog modulation
    B.
    digital modulation
    C.
    multiplexing
    D.
    none of the mentioned

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  19. Wireless transmission can be done via:
  20. A.
    radio waves
    B.
    microwaves
    C.
    infrared
    D.
    all of the mentioned

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