A-Level AQA Computer Science Paper 2 Review Questions and Answers

Baud Rate The maximum possible number of signal changes that can occur in a wire per second. Bit Rate The number of bits that can be sent down a wire per second. Integer A whole number that can be positive, negative or zero. Examples: -3, 0, 7, 2013588. Natural (Number) A whole number that is either positive or zero. Examples: 0, 1, 2, 100, 67238. Rational (Number) Any number that can be represented as the fraction 'a/b' where 'a' and 'b' are both integers. Examples: -0.2, 4/5, 1, 1/3. Irrational (Number) Any number that cannot be represented as a fraction. Examples: square root of 2, PI. Real (Number) Any number that can either be rational or irrational. Boolean A value that is either true or false. String A series of characters. Array A variable that can store multiple values of the same data type. Example: Storing the high-scores of a game as integers. Record A variable that can store multiple values that can have different data types. Example: Storing data about a book; a string for the title, an integer for the number of pages, etc.