BCS Bachelor of Computer Science Degree MCQ 5

Question 1

Which machine learning technique is used when labeled training data is unavailable?

Accepted Answer

Unsupervised Learning

Answer

Unsupervised learning finds patterns in data without labeled examples, using methods like clustering and dimensionality reduction.

Question 2

What does the principle of 'separation of concerns' advocate in software design?

Accepted Answer

Dividing a program into distinct sections, each addressing a separate concern

Answer

Separation of concerns divides software into distinct sections (e.g., UI, logic, data) so each handles a specific responsibility.

Question 3

Which of the following best describes a deadlock in an operating system?

Accepted Answer

A set of processes each waiting for a resource held by another in the set

Answer

Deadlock occurs when a group of processes are permanently blocked because each holds a resource that another process in the group needs.

Question 4

In computer networks, what is the difference between a hub and a switch?

Accepted Answer

A hub broadcasts to all ports; a switch forwards to specific ports using MAC addresses

Answer

A hub broadcasts incoming frames to all ports while a switch learns MAC addresses and forwards frames only to the destination port.

Question 5

What is the time complexity of accessing an element by index in an array?

Accepted Answer

O(1)

Answer

Array index access is O(1) because the memory address is computed directly from the base address and index using arithmetic.

BCS - Bachelor Of Computer Science Degree Practice Test