AQA GCSE Computer Science (8525)

3.3: Fundamentals of Data Representation: revision quiz and key terms

Free practice for 3.3: Fundamentals of Data Representation in AQA GCSE Computer Science (8525). It has 8 parts, listed below. Try the questions, then check the key terms.

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Question 1 · Multiple choice

Which compression method assigns shorter codes to more frequently occurring characters?

Question 2 · True or false?

Shifting a binary number one place to the left generally multiplies its value by 2.

Question 3 · Multiple choice

What is the denary value of the binary number 10101100?

Question 4 · True or false?

Sound must be converted into an analogue form before it can be stored on a computer.

Question 5 · Multiple choice

Which change would increase the file size of a sound recording?

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Key terms for 3.3: Fundamentals of Data Representation

8-bit number: A binary number made up of eight binary digits, able to represent values from 0 to 255.
Colour depth: The number of bits used to store the colour of each pixel.
Decimal: The base 10 number system that humans commonly use in everyday life.
Pixel: The smallest single element of a bitmap image.
Run length encoding (RLE): A compression method that represents repeated data using frequency and data value pairs.
Sample rate: The number of sound samples taken per second, measured in hertz.
Sample resolution: The number of bits used to store each sound sample.
SI units: The International System of Units, on which kilo, mega, giga and tera are based, using powers of 10.

What 3.3: Fundamentals of Data Representation covers

In RADevo this topic has a full topic test and a focused quiz for each part:

3.3.1 Number Bases
3.3.2 Converting Between Number Bases
3.3.3 Units of Information
3.3.4 Binary Arithmetic
3.3.5 Character Encoding
3.3.6 Representing Images
3.3.7 Representing Sound
3.3.8 Data Compression

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