SQA National 5 Computing Science 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which numbering system uses only two digits?

Base 10

Base 16

Base 2

The numbering system that uses only two digits is Base 2, also known as the binary system. In this system, the only digits used are 0 and 1. Each digit represents a power of two, which is the foundational principle behind binary counting and digital electronics.

For example, in binary, the number "10" actually represents the decimal number 2 (1*2^1 + 0*2^0). This simplicity allows computers and electronic devices to use the binary system efficiently, as it corresponds to the two states of electronic switches: on (1) and off (0).

The other numbering systems mentioned use more than two digits. Base 10 uses ten digits (0 through 9), Base 16 uses sixteen digits (0 through 9 and A through F), and Base 8 uses eight digits (0 through 7). Each of these systems serves different purposes and represents numbers in their own way, but only Base 2 exclusively relies on just the two digits, making it unique among the options provided.

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Base 8

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