Unit 1 Principles of Computer Science

• Computing
• Further Education (Key Stage 5)

Unit 1 Principles of Computer Science

Revision

What is meant by decomposition in computational thinking?

1. Identifying patterns in data
2. Breaking a problem into smaller parts
3. Removing unnecessary data
4. Writing program code

Which of the following best describes pattern recognition?

1. Writing algorithms
2. Finding similarities and differences in problems
3. Testing program output
4. Creating flowcharts

Which post-validation action would best improve data accuracy?

1. Ignoring the invalid input
2. Automatically ending the program
3. Prompting the user to re-enter valid data
4. Storing the invalid data for later use

What is abstraction mainly used for?

1. Writing longer programs
2. Removing irrelevant details
3. Adding extra data
4. Debugging code

What is a key advantage of using an API when developing software?

1. It removes the need for all testing
2. It guarantees software will be error-free
3. It replaces the need for programming languages
4. It allows developers to reuse existing functionality efficiently

What is the main purpose of algorithm design?

1. To test programs
2. To write code in a language
3. To describe a step-by-step solution
4. To store data

What is pseudocode mainly used for?

1. Writing final program code
2. Describing algorithms clearly
3. Running programs
4. Testing software

Which pseudocode keyword is used to receive data from a user?

1. OUTPUT
2. PRINT
3. INPUT
4. WRITE

Which structure controls decision making in pseudocode?

1. FOR
2. WHILE
3. IF
4. BEGIN

What does indentation show in pseudocode?

1. Variable type
2. Program speed
3. Structure and hierarchy
4. Output format

Which loop repeats a fixed number of times?

1. WHILE
2. REPEAT UNTIL
3. FOR
4. IF

Which symbol represents a decision in a flowchart?

1. Oval
2. Rectangle
3. Parallelogram
4. Diamond

Which data type stores true or false values?

1. Boolean
2. Float
3. Integer
4. String

What is a constant?

1. A loop control
2. A value that cannot change
3. A variable that can change
4. A data structure

What does the modulo (MOD) operator return?

1. Quotient
2. Remainder
3. Product
4. Difference

Which operator checks if two values are equal?

1. >=
2. <>
3. <=
4. =

Which Boolean operator returns true only if both conditions are true?

1. AND
2. XOR
3. NOT
4. OR

What does string concatenation do?

1. Converts numbers to strings
2. Finds string length
3. Removes characters
4. Joins strings together

What is the main purpose of built-in functions in a programming language?

1. To replace variables and data types
2. To prevent user input
3. To provide pre-written routines that perform common tasks
4. To allow programmers to write all code from scratch

What is the purpose of data validation?

1. Ensure data is correct
2. Encrypt data
3. Store more data
4. Improve program speed

Which validation check ensures a value falls within limits?

1. Data type
2. Format check
3. Presence check
4. Range check

What is meant by branching in a computer program?

1. Repeating a section of code a fixed number of times
2. Selecting different paths of execution based on conditions
3. Storing data in multiple locations
4. Breaking a problem into smaller parts

What does BREAK do in a loop?

1. Pauses execution
2. Exits the loop
3. Skips one iteration
4. Restarts the loop

Which algorithm repeatedly swaps adjacent values?

1. Binary search
2. Quick sort
3. Insertion sort
4. Bubble sort

Which search algorithm requires sorted data?

1. Linear search
2. Binary search
3. Serial search
4. Random search

What does FIFO stand for?

1. First In Final Out
2. Fast Input Fast Output
3. First In First Out
4. Final In First Out

What is an object in object-oriented programming?

1. A function
2. A variable
3. A loop
4. A class instance

Which OOP feature allows code reuse?

1. Polymorphism
2. Inheritance
3. Encapsulation
4. Data hiding

What triggers code execution in event-driven programming?

1. Loops
2. Functions
3. Events
4. Variables

What is the name of the code that defines the type of event that will trigger code?

1. Service Oriented Processing
2. Trigger
3. Event handler
4. Event loop

Which language is primarily a mark-up language?

1. Python
2. HTML5
3. Visual Basic
4. C++

What is client-side scripting mainly used for?

1. Database access
2. User interaction
3. File storage
4. Server processing

Why might code be translated to another language?

1. To remove features
2. To reduce readability
3. To increase errors
4. To improve compatibility

Who can be affected by translating code?

1. Users
2. Developers
3. Developers, users and organisations
4. Organisations

What is the main purpose of server-side processing in web development?

1. To respond only to mouse and keyboard events
2. To store data temporarily in the browser
3. To handle data processing and logic on the web server
4. To control how a web page looks on the user’s screen

Which feature is most closely associated with procedural programming?

1. Classes and objects
2. Top down processing
3. Mark-up tags
4. Event handlers

What does a sequential code construct mean in a program?

1. Code that repeats until a condition is met
2. Code that executes one statement after another in order
3. Code that runs only when an event occurs
4. Code that selects between multiple paths

What is a difference between lists and array data structures?

1. Arrays do not use an index to reference items of data
2. Arrays can only be used in a linear search routine
3. Arrays can only store data of one type
4. Lists are always multi dimensional

Which data type would you use to represent money?

1. Char
2. Integer
3. Float
4. Boolean