A-Level AQA Computer
Science Paper 2 2026 |
Study Guide, Practice
Questions, Answers,
Rationales & Exam Review
| Complete Ethics Study
Guide
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
,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.
Variable A metaphor for it is that is a box that can store a specific type of item (the data type)
and has a name assigned to it (the identifier). Its value can be changed during run-
time of the program.
, Constant A metaphor for it is that is a box that can store a specific type of item (the data type)
and has a name assigned to it (the identifier). Its value cannot be changed during
run-time of the program.
Subroutine This can be broken down into procedures and functions.
Procedure A block of code that performs a specific task that does not return a value.
Parameters can be passed into it.
Function A block of code that performs a specific task that returns a value. Parameters can
be passed into it.
Selection This is when an if statement or select case is used to, for example, check the value
of a variable.
Iteration This is when, within the program, there is a loop.
Definite Iteration The number of times that the program will loop is already specified.
Example: For loop.
Indefinite Iteration The number of times the program will loop is unknown.
Example: Do loop.
Nested (structures) This is when either iterative or selective statements are put inside of each other.
Meaningful Identifiers Subroutines, variables and objects should have sensible names.
Real Division Finds the value (usually as a decimal) of one number divided by another.
Integer Division Finds the integer part of one number divided by another.
Science Paper 2 2026 |
Study Guide, Practice
Questions, Answers,
Rationales & Exam Review
| Complete Ethics Study
Guide
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
,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.
Variable A metaphor for it is that is a box that can store a specific type of item (the data type)
and has a name assigned to it (the identifier). Its value can be changed during run-
time of the program.
, Constant A metaphor for it is that is a box that can store a specific type of item (the data type)
and has a name assigned to it (the identifier). Its value cannot be changed during
run-time of the program.
Subroutine This can be broken down into procedures and functions.
Procedure A block of code that performs a specific task that does not return a value.
Parameters can be passed into it.
Function A block of code that performs a specific task that returns a value. Parameters can
be passed into it.
Selection This is when an if statement or select case is used to, for example, check the value
of a variable.
Iteration This is when, within the program, there is a loop.
Definite Iteration The number of times that the program will loop is already specified.
Example: For loop.
Indefinite Iteration The number of times the program will loop is unknown.
Example: Do loop.
Nested (structures) This is when either iterative or selective statements are put inside of each other.
Meaningful Identifiers Subroutines, variables and objects should have sensible names.
Real Division Finds the value (usually as a decimal) of one number divided by another.
Integer Division Finds the integer part of one number divided by another.
