Knowledge Hub Quiz

1. Which data structure uses FIFO (First In First Out) principle?

Stack Queue Tree

2. What is the time complexity of binary search algorithm?

O(n) O(log n) O(n log n)

3. Which of the following is NOT an operating system?

Windows Linux Oracle

4. What is the main function of an operating system?

Compiling code Managing hardware resources Designing websites

5. Which OOP concept allows using the same method name with different implementations?

Inheritance Polymorphism Encapsulation

6. Which OOP concept restricts direct access to some of an object's components?

Abstraction Encapsulation Inheritance

7. Which SQL statement is used to retrieve data from a database?

SELECT UPDATE DELETE

8. What is a primary key in a database?

A unique identifier for each record A field that can have duplicate values A field used for sorting data

9. What is the purpose of normalization in databases?

To increase redundancy To minimize data duplication and improve integrity To decrease performance

10. Which design pattern provides a way to access the elements of an aggregate object sequentially without exposing its underlying representation?

Singleton Iterator Observer