Cognizant Core Knowledge and Fundamentals 4

Question 1

What does ACID stand for in database transactions?

Accepted Answer

Atomicity, Consistency, Isolation, Durability

Answer

Accuracy, Completeness, Integrity, Dependency

Answer

Atomicity, Concurrency, Isolation, Distribution

Answer

Access, Control, Integrity, Data

Question 2

Which design pattern ensures a class has only one instance and provides a global access point?

Accepted Answer

Singleton Pattern

Answer

Factory Pattern

Answer

Observer Pattern

Answer

Decorator Pattern

Question 3

What is the output of the following: print(type(3/2)) in Python 3?

Accepted Answer

Answer

Answer

Answer

Question 4

Which layer of the TCP/IP model corresponds to the OSI model's Network layer?

Accepted Answer

Internet layer

Answer

Application layer

Answer

Transport layer

Answer

Link layer

Question 5

In version control with Git, what does 'git merge' do?

Accepted Answer

Combines changes from one branch into another

Answer

Deletes a branch permanently

Answer

Creates a new repository copy

Answer

Reverts the last commit

Question 6

What is the difference between '==' and '===' in JavaScript?

Accepted Answer

'==' checks value only; '===' checks value and type

Answer

They are identical in behavior

Answer

'===' checks value only; '==' checks value and type

Answer

'==' is used for numbers only

Question 7

Which of the following best describes polymorphism in OOP?

Accepted Answer

The ability of different objects to be treated as instances of the same class

Answer

Hiding internal implementation details

Answer

A class inheriting from multiple parent classes

Answer

Bundling data and methods together