Computer Science AQA A-level Paper 1 Test With Verified Answers

Computer Science AQA A-level Paper 1 Test With Verified Answers What is an integer? - ANSWER A positive or negative whole number What is a Real or Float number? - ANSWER A positive or negative number that can have a fractional part. What is a Boolean? - ANSWER True or False What is a character? - ANSWER A single letter, number or symbol What is a string? - ANSWER A group of characters What is Date/Time? - ANSWER A way of storing Date/Time What is a pointer? - ANSWER A way of storing a memory address. What is a record? - ANSWER A collection of related fields, each of which could hold a different data type. What is an array? - ANSWER A finite, indexed set of related elements of the same data type. What is a user defined data type? - ANSWER A data type derived from existing data types in order to create a customized data structure. What is variable declaration? - ANSWER Creating a variable for the first time. giving it a name and sometimes a data type. What is constant decleration ? - ANSWER Creating a constant for the first time. What is assignment? - ANSWER giving a constant or a variable a value. what is iteration? - ANSWER repetition of a process e.g. a while or for loop. this could be definite or indefinite. What is selection? - ANSWER comparing values and then choosing an appropriate action. e.g. an if statement. what is a subroutine? - ANSWER A named block of code containing a set of instructions designed to perform a frequently used operation. What is definite iteration? - ANSWER the number of repititions is known before the loop starts. What is indefinite iteration? - ANSWER the number of repititions is not known before the loop starts. What is a nested structure? - ANSWER One structure is placed within another. Easily identified by indentation. What is meant by meaningful identifier names? - ANSWER Giving constants, variables and subroutines sensible and meaningful identifier names. What does the real/float division operator do? - ANSWER divides one number by the other. What does the integer division operator do? - ANSWER divides one number by the other but only returns the whole number part. What does the modulo operator do? - ANSWER returns the remainder of an integer division. What does the exponentiation operator do? - ANSWER raises one value to the power of another. What does the rounding operator do? - ANSWER limits the degree of accuracy of a number. (rounds up or down) What does the truncation operator do? - ANSWER removes the decimal part of a number. (never rounds up) what does the string handling function "Length" do? - ANSWER Returns the number of characters in a specified string. what does the string handling function "position" do? - ANSWER returns the position of a specified character within a string. what does the string handling function "concatenation" do? - ANSWER joins two or more