Represent −45 as an 8-bit two's complement binary number.
From Paper 2 (written)
1.21 mark
Convert 11010011 to hexadecimal.
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1.32 marks
A floating-point number has an 8-bit two's complement mantissa 0.1010000 and a 4-bit two's complement exponent 0011. Calculate its denary value.
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1.42 marks
Explain why floating-point numbers are normalised.
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1.53 marks
A 3-minute stereo recording is sampled at 44.1 kHz with 16-bit resolution. Calculate the file size in megabytes (1 MB = 10⁶ bytes).
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1.62 marks
Calculate the size in bytes of an uncompressed 1920 × 1080 bitmap with a colour depth of 24 bits.
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1.73 marks
Explain how run-length encoding works and why it is effective for some images but not others.
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1.82 marks
Explain the difference between lossy and lossless compression.
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1.93 marks
Explain why the Vernam cipher is said to offer perfect security.
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This paper is written by Plasmo in the style of the AQA A-Level Computer Science exam. It is not a past paper and is not produced or endorsed by the exam board.
Fundamentals of data representation Exam Questions: AQA A-Level Computer Science | Plasmo