Cognizant Core Knowledge and Fundamentals 4

Question 1

What does ACID stand for in database transactions?

Accepted Answer

Atomicity, Consistency, Isolation, Durability

Answer

ACID properties (Atomicity, Consistency, Isolation, Durability) ensure reliable processing of database transactions.

Question 2

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

Accepted Answer

Singleton Pattern

Answer

The Singleton pattern restricts instantiation of a class to a single object and provides a global access point to it.

Question 3

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

Accepted Answer

Answer

In Python 3, the / operator always performs true division and returns a float, so 3/2 equals 1.5, which is a float.

Question 4

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

Accepted Answer

Internet layer

Answer

The Internet layer in the TCP/IP model handles logical addressing and routing, corresponding to the Network layer (Layer 3) in OSI.

Question 5

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

Accepted Answer

Combines changes from one branch into another

Answer

git merge integrates changes from one branch into the current branch, creating a merge commit if histories have diverged.

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