Cognizant Core Knowledge and Fundamentals 3

Question 1

Which sorting algorithm has the best average-case time complexity?

Accepted Answer

Merge Sort

Answer

Bubble Sort

Answer

Insertion Sort

Answer

Selection Sort

Question 2

What is a primary key in a relational database?

Accepted Answer

A column that uniquely identifies each row in a table

Answer

A foreign key that references another table

Answer

An index created automatically on every column

Answer

A constraint that allows duplicate values

Question 3

Which HTTP method is typically used to update an existing resource partially?

Accepted Answer

PATCH

Answer

GET

Answer

POST

Answer

PUT

Question 4

What is the purpose of a constructor in object-oriented programming?

Accepted Answer

To initialize an object when it is created

Answer

To destroy an object after use

Answer

To define static class methods

Answer

To override inherited methods

Question 5

Which of the following is an example of a non-linear data structure?

Accepted Answer

Graph

Answer

Array

Answer

Queue

Answer

Stack

Question 6

In networking, what does DNS stand for?

Accepted Answer

Domain Name System

Answer

Data Network System

Answer

Digital Network Service

Answer

Dynamic Node Service

Question 7

Which access modifier in Java makes a member accessible only within its own class?

Accepted Answer

private

Answer

public

Answer

protected

Answer

default