PCAP-31-03 3.1 Understand Machine Representation of Characters PCAP-31 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What is the purpose of the escape sequence \\ in a Python string literal?

   • AIt represents a single backslash character.
   • BIt represents a newline character.
   • CIt represents a forward slash character.
   • DIt represents a double backslash character.
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2. 7expert · hard

   A developer is optimizing a Python application that processes large text files. The files are predominantly ASCII but occasionally contain non-ASCII characters. The developer is considering whether to use UTF-8 or UTF-16 for storage. What is the most accurate trade-off to consider?

   • AUTF-16 is always more storage-efficient than UTF-8 because it uses a fixed 2-byte width.
   • BUTF-8 and UTF-16 use the same amount of storage for all characters.
   • CUTF-8 will always use less storage than UTF-16 for any text.
   • DUTF-8 is more storage-efficient for ASCII-heavy text, but UTF-16 may be more efficient for text with many BMP characters.
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4. 8application · easy

   A Python application needs to store user-generated text that includes emoji and mathematical symbols. The team is deciding between ASCII and Unicode. Which statement accurately describes the limitation they will face?

   • AUnicode assigns a unique code point to every character, including emoji and symbols.
   • BASCII is a superset of Unicode and can represent all Unicode characters.
   • CUnicode code points are limited to 256 values, so emoji must be encoded separately.
   • DASCII can represent emoji if the code point is below 128.
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5. 9foundation · easy

   Which statement correctly describes the ASCII character encoding standard?

   • AIt uses 16 bits per character and defines 65,536 code points.
   • BIt uses 8 bits per character and defines exactly 256 code points.
   • CIt uses 7 bits per character and defines 128 code points, from 0 to 127.
   • DIt uses a variable number of bits per character, from 1 to 4 bytes.
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6. 10application · medium

   A Python application is being developed for international use. The team needs to store text in a database that supports only a fixed-width character encoding. They are evaluating whether to use UTF-32 instead of UTF-8. What is a key trade-off they should consider?

   • AUTF-32 uses less storage than UTF-8 for text containing many ASCII characters.
   • BUTF-32 cannot represent emoji, so it is unsuitable for modern applications.
   • CUTF-32 is backward-compatible with ASCII, so existing ASCII data requires no conversion.
   • DUTF-32 uses more storage space but simplifies indexing because every character is the same width.
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