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Exam (elaborations) A-Level AQA Computer Science Paper 2

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ENTAILS QUESTIONS AND ANSWERS

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A-Level AQA Computer Science Paper 2
Course
A-Level AQA Computer Science Paper 2

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,Baud Rate - CORRECT ANSWERS-The maximum possible number of signal changes
that can occur in a wire per second.

Bit Rate - CORRECT ANSWERS-The number of bits that can be sent down a wire per
second.

Integer - CORRECT ANSWERS-A whole number that can be positive, negative or zero.

Examples: -3, 0, 7, 2013588.

Natural (Number) - CORRECT ANSWERS-A whole number that is either positive or
zero.


Examples: 0, 1, 2, 100, 67238.

Rational (Number) - CORRECT ANSWERS-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) - CORRECT ANSWERS-Any number that cannot be represented as
a fraction.

Examples: square root of 2, PI.

Real (Number) - CORRECT ANSWERS-Any number that can either be rational or
irrational.

Boolean - CORRECT ANSWERS-A value that is either true or false.

String - CORRECT ANSWERS-A series of characters.

Array - CORRECT ANSWERS-A variable that can store multiple values of the same
data type.

Example: Storing the high-scores of a game as integers.

Record - CORRECT ANSWERS-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 - CORRECT ANSWERS-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 - CORRECT ANSWERS-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 - CORRECT ANSWERS-This can be broken down into procedures and
functions.

Procedure - CORRECT ANSWERS-A block of code that performs a specific task that
does not return a value. Parameters can be passed into it.

Function - CORRECT ANSWERS-A block of code that performs a specific task that
returns a value. Parameters can be passed into it.

Selection - CORRECT ANSWERS-This is when an if statement or select case is used
to, for example, check the value of a variable.

Iteration - CORRECT ANSWERS-This is when, within the program, there is a loop.

Definite Iteration - CORRECT ANSWERS-The number of times that the program will
loop is already specified.

Example: For loop.

Indefinite Iteration - CORRECT ANSWERS-The number of times the program will loop
is unknown.

Example: Do loop.

Nested (structures) - CORRECT ANSWERS-This is when either iterative or selective
statements are put inside of each other.

Meaningful Identifiers - CORRECT ANSWERS-Subroutines, variables and objects
should have sensible names.

Real Division - CORRECT ANSWERS-Finds the value (usually as a decimal) of one
number divided by another.

Integer Division - CORRECT ANSWERS-Finds the integer part of one number divided
by another.

Integer Remainder - CORRECT ANSWERS-Finds the remainder of one number divided
by another.

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Institution
A-Level AQA Computer Science Paper 2
Course
A-Level AQA Computer Science Paper 2

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