WJEC Eduqas GCSE Computer Science

Topic 4: Data: revision quiz and key terms

Free practice for Topic 4: Data in WJEC Eduqas GCSE Computer Science. It has 8 parts, listed below. Try the questions, then check the key terms.

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Question 1 · Multiple choice

What is the denary value of the hexadecimal number 2F?

Question 2 · True or false?

Vector images are often used for logos and illustrations because they stay sharp.

Question 3 · Multiple choice

What is -5 represented as in 8-bit two's complement?

Question 4 · True or false?

Increasing the sample rate of a sound recording will reduce its file size.

Question 5 · Multiple choice

What is the effect of an arithmetic shift right by 2 places on a binary number?

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Key terms for Topic 4: Data

Bitmap image: Made up of a grid of individual coloured pixels.
Boolean data type: Can only store one of two possible values, true or false.
Denary: The standard base-10 number system used in everyday life.
Hexadecimal: A base-16 number system that uses the digits 0–9 and the letters A–F.
Lossless compression: Reduces file size without losing any data, so the original can be fully restored.
Lossy compression: Reduces file size by permanently removing some data, so the original cannot be fully restored.
Sample rate: The number of samples of a sound wave taken each second, measured in hertz.
Two's complement: A method of representing signed binary numbers in which the most significant bit has a negative place value.

What Topic 4: Data covers

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

4.1 Number Systems
4.2 Signed Binary
4.3 Binary Calculations
4.4 Arithmetic Shift
4.5 Character Sets and Data Types
4.6 Graphical Representation
4.7 Sound Representation
4.8 Compression

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