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Data Representation Flashcards
Free Computer Science Revision Cards
From converting between binary and hexadecimal to understanding how images and sound are stored digitally, these free Computer Science flashcards cover data representation from the ground up.
Question
What is a bit?
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Answer
The smallest unit of digital data — a binary digit that is either 0 or 1.
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Question
What is a byte?
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Answer
A group of 8 bits. One byte can represent 256 different values (0–255).
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Question
What is binary?
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Answer
Base-2 number system using only the digits 0 and 1. All digital computers represent data internally using binary.
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Question
What is denary (decimal)?
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Answer
Base-10 number system using digits 0–9. The number system used in everyday life.
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Question
Convert the binary number 1010 to denary.
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Answer
10. (1×8) + (0×4) + (1×2) + (0×1) = 8 + 0 + 2 + 0 = 10.
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Question
Convert the denary number 25 to binary.
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Answer
11001. 16+8+1 = 25 → 11001.
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Question
What is hexadecimal?
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Answer
Base-16 number system using digits 0–9 and letters A–F (where A=10, B=11, C=12, D=13, E=14, F=15). Used as a compact way to represent binary.
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Question
Why is hexadecimal used in computing?
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Answer
One hex digit represents exactly 4 bits (a nibble), so it's a compact and human-readable way to express binary values — used in colour codes, memory addresses, etc.
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Question
What is ASCII?
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Answer
American Standard Code for Information Interchange — a character encoding standard that maps characters (letters, digits, symbols) to 7-bit binary numbers.
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Question
What is Unicode and why was it developed?
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Answer
A universal character encoding standard that can represent characters from all the world's writing systems. ASCII only covers 128 characters; Unicode handles over 1 million.
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