What is Data in Computer Science?
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Questions and Answers

What is the ASCII value of the numeric character 0?

  • 65
  • 97
  • 32
  • 48 (correct)
  • A 32-bit computer can process 64-bit numbers in one operation.

    False

    What is the primary usage of JavaScript?

    Client-side scripting for web applications

    The binary value between 0 and 127 is used to represent a specific __________ in ASCII.

    <p>character</p> Signup and view all the answers

    Match the following prefixes with their equivalent power of 2:

    <p>Kilo = 2^10 Mega = 2^20 Giga = 2^30 Peta = 2^50</p> Signup and view all the answers

    What is the range of ASCII values for lower case alphabets?

    <p>97 to 122</p> Signup and view all the answers

    What is the meaning of the term 'datum'?

    <p>A raw fact</p> Signup and view all the answers

    A bit is a collection of 4 binary digits.

    <p>False</p> Signup and view all the answers

    What is the basic unit of measuring the memory size in the computer?

    <p>Byte</p> Signup and view all the answers

    A collection of 8 bits is called a _______________.

    <p>Byte</p> Signup and view all the answers

    What is the number of bits in a nibble?

    <p>4</p> Signup and view all the answers

    In decimal system, 1 Kilo represents 1024.

    <p>False</p> Signup and view all the answers

    What is the term for '0' or '1' that the Computer can understand?

    <p>Machine language</p> Signup and view all the answers

    Match the following memory sizes:

    <p>TeraByte = 1024 GB GigaByte = 1024 MB MegaByte = 1024 KB KiloByte = 1024 bytes</p> Signup and view all the answers

    Study Notes

    Data and Its Representation

    • Data originates from the term "datum," indicating a raw fact about people, places, or objects.
    • Variables defined include Name, Age, Class, Marks, and Subject. Example values: Name = Rajesh, Age = 16, Class = XI, Marks = 65, Subject = Computer Science.
    • Data is processed to form meaningful information, e.g., "Rajesh is 16 years old, studying in Class XI, has scored 65 marks in Computer Science."

    Binary System

    • Computers process data as binary digits, represented as ‘0’ (zero) and ‘1’ (one).
    • The binary system, known as Machine language, is essential for computer understanding of data.

    Units of Data

    • A bit is the smallest unit of data, representing either ‘0’ or ‘1’.
    • A nibble consists of 4 bits, while a byte, comprising 8 bits, is the standard memory size unit in computers.
    • Word length refers to bits processed by a CPU, which can be 8, 16, 32, or 64 bits; modern computers typically use 32 or 64 bits.

    Memory Size Measurements

    • KiloByte (KB) represents 1024 bytes (2^10).
    • MegaByte (MB) represents 1024 KB (2^20).
    • GigaByte (GB) represents 1024 MB (2^30).
    • TeraByte (TB) represents 1024 GB (2^40).

    Larger Memory Sizes

    • PetaByte (PB) = 2^50 bytes.
    • ExaByte (EB) = 2^60 bytes.
    • ZettaByte (ZB) = 2^70 bytes.
    • YottaByte (YB) = 2^80 bytes.

    Representing Characters

    • Bytes represent characters in text, utilizing coding schemes for character sets.
    • ASCII (American Standard Code for Information Interchange) is a widely used coding scheme where each binary value from 0 to 127 corresponds to specific characters.
    • ASCII values: space = 32, numeric 0 = 48, lowercase a-z = 97 to 122, uppercase A-Z = 65 to 90.

    Computer Speed

    • A computer's processing speed is influenced by its word length; a 64-bit computer can handle 64-bit numbers in one operation, while a 32-bit computer must break them into smaller sections, slowing processing speed.

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    Learn about the concept of data, its definition, and examples. Understand how data is a raw fact about people, places, or objects and how it is processed to get information.

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