Quiz 6

In data structures, which data structure is a linear collection of elements with constant-time insertions and deletions at both ends?

• a) Queue

• b) Stack

• c) Linked List

• d) Deque (Double-ended Queue)

What is the output of the following JavaScript code?

console.log(2 + '2');

• a) 4

• b) "22"

• c) 22

• d) "2 + 2"

In Java, which keyword is used to implement method overriding?

• a) extends

• b) override

• c) implements

• d) super

In the MERN stack, which component is responsible for building user interfaces?

• a) MongoDB

• b) Express.js

• c) React

• d) Node.js

What does "CPU" stand for in the context of computer hardware?

• a) Central Processing Unit

• b) Computer Processing Unit

• c) Core Processing Unit

• d) Control Processing Unit

In algorithm complexity analysis, what does "O(n log n)" represent?

• a) Linear time complexity

• b) Quadratic time complexity

• c) Logarithmic time complexity

• d) Linearithmic time complexity

What is the purpose of "useState" in React?

• a) To perform asynchronous operations

• b) To manage state in functional components

• c) To fetch data from an API

• d) To define class components

Which of the following is a NoSQL database?

• a) MySQL

• b) PostgreSQL

• c) MongoDB

• d) Oracle

What is the role of a "try-catch" block in programming?

• a) To terminate the program

• b) To handle exceptions

• c) To create loops

• d) To define functions

Which Java feature allows a subclass to have multiple superclasses?

• a) Multiple inheritance

• b) Multithreading

• c) Method overriding

• d) Method overloading