Edexcel GCSE Computer Science Exam 2024 Updated Questions And Complete Answers
What is a character?
A letter,number or symbol on a given character set
What is a string?
A sequence of characters
What is casting?
Changing the data type of a variable
What is a count-controlled loop?
A loop...
What is a character?
A letter,number or symbol on a given character set
What is a string?
A sequence of characters
What is casting?
Changing the data type of a variable
What is a count-controlled loop?
A loop that repeats a specific number of times (FOR loops)
What is a condition controlled loop?
A loop that runs until a condition is met (WHILE loops)
When would you use a variable?
When a value might need to change while the program is running
When would you use a constant?
When a value would not need to change while while the program is running
Why are constants useful?
Readability and easier to update
What is a subprogram?
A block of code that performs a specific task
What are libraries?
Collections of pre-written subprograms for specific purposes
What is a local variable?
A variable that is declared inside a function or procedure so can be accessed within the
subprogram
What is a global variable?
A variable that can be accessed from anywhere
,Do functions return a value?
Yes
Do procedures return a value?
No
What is an array?
A data structure with one or more elements of the same type (have a fixed length only
contain elements of the same data type)
What is an index?
A position within an array
What is a 1D array?
An array that stores data in one direction (horizontal)
What is a 2D array?
An array that stores data horizontally and vertically (indexed with two numbers)
Why is it good to close files after use?
It frees up resources,prevents corruption and flushes the buffer
What's does MOD do?
Gives remainder
What does DIV do?
Shows how many times x goes into y (23 DIV 5 = 4)
What does the Boolean operator NOT do?
The opposite of the input
What does the Boolean operator OR do?
If one side is true then the output is true
What does the Boolean operator AND do?
Both sides have to be true for the output to be true
What is iterative testing?
Testing in stages
What is final testing?
Testing after implementation
What is sanitisation?
Modifying an input to make it valid
, What is an overflow error?
An error that occurs because a value is too large for the program to handle
What is a bitmap?
An image stored as an array of individual pixels
What is a pixel?
An individual picture element
What is the resolution?
The amount of detail an image holds
What is the equation for size of image?
Width * Height
What is colour depth?
The number of bits allocated to represent each pixel's colour
What effect does increasing resolution and colour depth have?
It gives a greater quality image but increases file size
What is the equation for File size?
File size = Width Height Colour depth
File size measured in bits
Width measured in pixels
Height measured in pixels
Colour depth measured in bits
What is included in metadata?
File name
File format
Colour depth
Resolution
What does increasing bitrate cause?
More detailed audio but more storage required
What is sampling?
Recording a signal at regular intervals
What is sampling frequency?
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