EmSAT Computer Science 3

Question 1

Which data structure uses LIFO (Last In, First Out) ordering?

Accepted Answer

Stack

Answer

A stack follows LIFO order, meaning the last element added is the first to be removed.

Question 2

What is the output of the expression: 17 MOD 5?

Accepted Answer

2

Answer

17 divided by 5 gives quotient 3 and remainder 2, so 17 MOD 5 = 2.

Question 3

Which of the following is a characteristic of an algorithm?

Accepted Answer

It must have a finite number of steps

Answer

An algorithm must terminate after a finite number of steps to produce a result.

Question 4

In a relational database, what does a primary key ensure?

Accepted Answer

Each record is uniquely identified

Answer

A primary key uniquely identifies each record in a database table, ensuring no duplicates.

Question 5

Which layer of the OSI model is responsible for routing packets between networks?

Accepted Answer

Network Layer

Answer

The Network Layer (Layer 3) handles logical addressing and routing of packets across networks.

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