carol793
carol793 7d ago โ€ข 0 views

Multiple Choice Questions on Variables in Python and JavaScript

Hey there, future coders! ๐Ÿ‘‹ Ever wondered how variables work in Python and JavaScript? It's super important to nail down these concepts, so I've put together a quick study guide and a practice quiz to help you master them. Let's dive in! ๐Ÿ‘ฉโ€๐Ÿ’ป
๐Ÿ’ป Computer Science & Technology

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brendahorton1988 Jan 1, 2026

๐Ÿ“š Quick Study Guide

  • ๐Ÿ’ก Variables: Named storage locations in memory that hold values.
  • ๐Ÿ Python:
    • ๐Ÿท๏ธ Dynamic typing (no need to declare variable types).
    • ๐Ÿงฎ Assignment using the `=` operator (e.g., `x = 10`).
    • โœ’๏ธ Variable names are case-sensitive.
  • ๐Ÿ“œ JavaScript:
    • ๐Ÿ”‘ Uses `var`, `let`, and `const` for variable declaration.
    • ๐ŸŒ `var` has function scope (or global if declared outside a function).
    • ๐Ÿงฑ `let` and `const` have block scope.
    • ๐Ÿ”’ `const` variables must be initialized and cannot be reassigned.
  • โž• Common Data Types:
    • ๐Ÿ”ข Numbers (integers, floats)
    • ๐Ÿ“œ Strings (text)
    • boolean (true/false)
    • [] Arrays (lists)
    • {} Objects (key-value pairs)
  • โš ๏ธ Important Differences: JavaScript requires explicit declaration using `var`, `let`, or `const`, while Python does not. Scope rules also differ significantly between the two languages.

๐Ÿงช Practice Quiz

  1. What is the primary difference between `var` and `let` in JavaScript?
    1. `var` has block scope, while `let` has function scope.
    2. `var` can be reassigned, while `let` cannot.
    3. `var` has function scope, while `let` has block scope.
    4. There is no difference.
  2. In Python, how do you assign the value `25` to a variable named `age`?
    1. `age =: 25`
    2. `age == 25`
    3. `let age = 25`
    4. `age = 25`
  3. Which of the following is NOT a valid way to declare a variable in JavaScript?
    1. `var myVar = 10;`
    2. `let myVar = 10;`
    3. `const myVar = 10;`
    4. `int myVar = 10;`
  4. What is the data type of the variable `x` after the following Python code: `x = "Hello"`?
    1. Integer
    2. Float
    3. String
    4. Boolean
  5. In JavaScript, which keyword is used to declare a constant variable?
    1. `var`
    2. `let`
    3. `const`
    4. `constant`
  6. What will be the output of the following Python code: `x = 5; x = "updated"; print(x)`?
    1. 5
    2. "x"
    3. Error
    4. "updated"
  7. Which of the following statements about variable naming is true in both Python and JavaScript?
    1. Variable names must start with a number.
    2. Variable names can only contain letters and numbers.
    3. Variable names are case-insensitive.
    4. Variable names can contain letters, numbers, and underscores.
Click to see Answers
  1. C
  2. D
  3. D
  4. C
  5. C
  6. D
  7. D

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