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Reading answers with explanations

IELTS · Part 3 · Cambridge 9 — Test 4

Information theory - the big idea: Reading answers

Answers to questions 27–40 (14 in all), each with why it is right.

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Read the whole passage and answer in the exam interface, timed as on the day.

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The passage opens

Information theory lies at the heart of everything - from DVD players and the genetic code of DNA to the physics of the universe at its most fundamental.It has been central to the development of the science of communication, which enables data to be sent electronically and has therefore had a major impact on our lives. A In April 2002 an event took place which demonstrated one of the many applications of information theory.The space probe Voyager I, launched in 1977, had sent back spectacular images of Jupiter and Saturn and then soared out of the Solar System on a one-way mission to the stars.After 25 years of exposure to the freezing temperatures of deep space, the probe was beginning to…

Answers 27–40

  1. 27

    an explanation of the factors affecting the transmission of information

    D Matching information

  2. 28

    an example of how unnecessary information can be omitted

    F Matching information

  3. 29

    a reference to Shannon's attitude to fame

    B Matching information

  4. 30

    details of a machine capable of interpreting incomplete information

    E Matching information

  5. 31

    a detailed account of an incident involving information theory

    A Matching information

  6. 32

    a reference to what Shannon initially intended to achieve in his research

    C Matching information

  7. 33

    Jupiter Note completion

  8. 34

    Solar System Note completion

  9. 35

    sensors Note completion

  10. 36

    spares Note completion

  11. 37

    radio dish Note completion

  12. 38

    The concept of describing something as true or false was the starting point for Shannon in his attempts to send messages over distances.

    TRUE True / False / Not Given

  13. 39

    The amount of information that can be sent in a given time period is determined with reference to the signal strength and noise level.

    TRUE True / False / Not Given

  14. 40

    Products have now been developed which can convey more information than Shannon had anticipated as possible.

    FALSE True / False / Not Given

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