Coding Challenge for Grade 3

What is a variable in Scratch?

• A variable in Scratch is a fixed value that never changes.

• A variable in Scratch is a placeholder for a value that can change.

• A variable in Scratch is a type of costume for characters.

• A variable in Scratch is a tool used for drawing shapes.

How do you create a loop in Python?

• Use 'if' statements in Python

• Use 'for' loops or 'while' loops in Python.

• Use 'switch' statements in Python

• Use 'do-while' loops in Python

Explain the concept of functions in JavaScript.

• Functions in JavaScript are blocks of code that can be defined and called to perform a specific task. They can take input parameters and return a value. Functions help in organizing code, promoting reusability, and improving readability.

• Functions in JavaScript cannot accept any parameters.

• Functions in JavaScript are used for styling web pages.

• Functions in JavaScript can only be called once in a program.

Give an example of a conditional statement in Scratch.

• if touching color blue

• if touching color red

• repeat until mouse down

• when key pressed 'A'

What are the different data types in Python?

• float

• str

• int, float, complex, str, bool, list, tuple, dict, set

• int

• double

How do you handle events in Scratch?

• Use event blocks like 'when green flag clicked' or 'when key pressed' to handle events in Scratch.

• Use looks blocks to handle events in Scratch

• Use motion blocks to handle events in Scratch

• Use sound blocks to handle events in Scratch

Provide a practical example of coding in Scratch.

• Writing a code in Scratch to make a car sprite jump when the spacebar is pressed.

• Creating a program in Scratch where a cat sprite moves to the right when the right arrow key is pressed.

• Creating a program in Scratch where a dog sprite moves up when the left arrow key is pressed.

• Developing a game in Scratch where a ball sprite changes color randomly.

What is the use of lists in programming?

• Lists are used to display images on the screen.

• Lists are used to play audio files.

• Lists are used to store multiple items in a single variable.

• Lists are used to perform mathematical calculations.

How can you declare and initialize a list in Python?

• my_list = [1, 2, 3]

• my_list = []

• my_list = list()

• my_list = {}

Explain the importance of variables in programming.

• Variables help in managing data, enabling reusability, and enhancing the flexibility of the code.

• Variables are unnecessary in programming

• Variables make the code less readable

• Variables slow down the execution of the code