BCS Bachelor of Computer Science Degree 4

Question 1

Which graph traversal algorithm uses a queue data structure and explores nodes level by level?

Accepted Answer

Breadth-First Search (BFS)

Answer

Breadth-First Search (BFS) uses a queue to explore all neighbors at the current depth before moving deeper.

Question 2

In SQL, which clause is used to filter groups of rows after a GROUP BY operation?

Accepted Answer

HAVING

Answer

The HAVING clause filters aggregated groups in SQL, whereas WHERE filters individual rows before aggregation.

Question 3

What is the function of a virtual machine (VM) in computing?

Accepted Answer

To emulate a complete computer system on top of physical hardware

Answer

A virtual machine emulates an entire computer system, allowing multiple OS instances to run on one physical host.

Question 4

Which principle of secure software design states that a user should only have access to what is strictly necessary for their tasks?

Accepted Answer

Least Privilege

Answer

The Principle of Least Privilege dictates that users and systems should have only the minimum permissions needed for their function.

Question 5

In computer networks, what does CIDR notation '/24' indicate in an IP address like 192.168.1.0/24?

Accepted Answer

The first 24 bits are the network portion

Answer

CIDR /24 means the first 24 bits of the IP address identify the network, leaving 8 bits for host addresses.

BCS - Bachelor Of Computer Science Degree Practice Test