Variables Constants Data Structures Quiz

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2. What is the main difference between a stack and a queue?

Stacks are faster than queues

Stacks use LIFO; queues use FIFO

Queues store more data than stacks

Stacks require more memory

3. Which of the following best describes variable naming conventions?

Rules that define how variables must be named for clarity and consistency

Restrictions that prevent variable usage

Mathematical formulas for calculating values

Methods for storing variables in memory

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5. What is the time complexity of accessing an element in an array by index?

O(n)

O(log n)

O(1)

O(n²)

6. Which statement about global variables is true?

They can only be used in one function

They are accessible throughout the entire program

They must be declared inside functions

They cannot be modified after declaration

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8. What is scope in programming?

The time a program takes to run

The region where a variable is accessible and usable

The size of memory allocated to data

The number of functions in a program

9. Which data structure is best for implementing a priority queue?

Array

Stack

Heap

String

10. What is the difference between declaring and initializing a variable?

They mean the same thing

Declaration creates the variable; initialization assigns it a value

Initialization happens only once; declaration can repeat

Declaration is for constants only

11. What is a variable in programming?

A named container that stores a value which can change during program execution

A fixed value that never changes

A mathematical equation used in calculations

A type of loop used in iteration

12. A linked list node typically contains which two components?

Key and value

Data and pointer to the next node

Index and element

Start and end positions

13. What is the main advantage of using arrays?

They can store only one data type

They allow random access to elements using an index

They automatically sort data

They require less memory than other structures

14. Which of the following is an example of a primitive data type?

String

Array

Integer

Class

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16. Which data structure uses the LIFO (Last In, First Out) principle?

Queue

Stack

Array

Linked List

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18. What is the primary purpose of data structures?

To organize and store data efficiently for quick access and modification

To replace all variables in a program

To eliminate the need for loops

To prevent errors in code

19. Which of the following best describes a constant?

A variable that changes frequently

A value that remains unchanged throughout program execution

A temporary storage location

A function parameter

Tech+ Basics of Variables Constants and Data Structures Quiz

1. In object-oriented programming, a _____ is a blueprint for creating objects.

2.

What first name or nickname would you like us to use?

2. What is the main difference between a stack and a queue?

3. Which of the following best describes variable naming conventions?

4. In a tree data structure, the topmost node is called the _____.

5. What is the time complexity of accessing an element in an array by index?

6. Which statement about global variables is true?

7. A _____ is a collection of key-value pairs used for fast lookups.

8. What is scope in programming?

9. Which data structure is best for implementing a priority queue?

10. What is the difference between declaring and initializing a variable?

11. What is a variable in programming?

12. A linked list node typically contains which two components?

13. What is the main advantage of using arrays?

14. Which of the following is an example of a primitive data type?

15. What does FIFO stand for in queue operations?

16. Which data structure uses the LIFO (Last In, First Out) principle?

17. A variable's _____ determines what type of data it can store.

18. What is the primary purpose of data structures?

19. Which of the following best describes a constant?