Topic 2: Data: revision quiz and key terms
Free practice for Topic 2: Data in Pearson Edexcel GCSE Computer Science (1CP2). It covers: binary, data representation, and data storage and compression. Try the questions, then check the key terms.
Try 5 free questions
How many binary bits does each hexadecimal digit represent?
In two's complement, a binary number with 1 as its most significant bit represents a negative number.
How many different characters can a 7-bit ASCII code represent?
Lossless compression permanently removes some of the original data to reduce file size.
How many bits make up a byte?
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Key terms for Topic 2: Data
- Amplitude
- The height of a sound wave, related to its volume.
- Arithmetic shift
- A binary shift that preserves the sign of a number; in an arithmetic shift right, the sign bit is copied into the vacated positions.
- Bit depth
- The number of bits used to represent each individual sample.
- Byte
- A unit of data storage made up of eight bits.
- Kibibyte
- Equal to 1024 bytes.
- Sampling
- Taking regular samples of an analogue sound wave to convert it to digital form.
- Two's complement
- Represents both positive and negative integers in binary.
What Topic 2: Data covers
In RADevo this topic has a full topic test and a focused quiz for each part:
- 2.1 Binary
- 2.2 Data Representation
- 2.3 Data Storage and Compression: Practice questions.
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