Cognizant Technical Screening 3

Question 1

Which HTTP method is idempotent and should be used to update a resource completely?

Accepted Answer

PUT

Answer

PUT replaces an entire resource and is idempotent — repeated calls produce the same result.

Question 2

What is the worst-case time complexity of QuickSort?

Accepted Answer

O(n²)

Answer

QuickSort degrades to O(n²) when the pivot is consistently the smallest or largest element (e.g., already sorted input with naive pivot).

Question 3

In Java, which collection class is synchronized and thread-safe by default?

Accepted Answer

Hashtable

Answer

Hashtable is synchronized on every method, making it thread-safe, unlike HashMap which is not.

Question 4

What does REST stand for in web services?

Accepted Answer

Representational State Transfer

Answer

REST stands for Representational State Transfer, an architectural style for distributed hypermedia systems.

Question 5

Which of the following is NOT a principle of SOLID design?

Accepted Answer

Dynamic Inheritance Principle

Answer

SOLID stands for Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion — Dynamic Inheritance is not part of it.

(Cognizant) Cognizant Test Practice Test

(Cognizant) Cognizant Test Practice Test

Cognizant Technical Screening 3