BCS Bachelor of Computer Science Degree MCQ 5 ā Questions and Answers
Question 1: Which machine learning technique is used when labeled training data is unavailable?
- Supervised Learning
- Reinforcement Learning
- Unsupervised Learning (Correct answer)
- Transfer Learning
Correct answer: Unsupervised Learning
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?
- Combining all related functionality into one module for simplicity
- Dividing a program into distinct sections, each addressing a separate concern (Correct answer)
- Ensuring all modules communicate through a single interface
- Keeping all business logic in the database layer
Correct answer: Dividing a program into distinct sections, each addressing a separate concern
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?
- A process consuming 100% CPU indefinitely
- A set of processes each waiting for a resource held by another in the set (Correct answer)
- A memory overflow causing a system crash
- A scheduling priority inversion between two threads
Correct answer: A set of processes each waiting for a resource held by another in the set
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?
- A hub operates at Layer 3; a switch at Layer 2
- A hub broadcasts to all ports; a switch forwards to specific ports using MAC addresses (Correct answer)
- A hub uses IP addresses; a switch uses MAC addresses for routing
- A hub is faster than a switch due to simpler hardware
Correct answer: A hub broadcasts to all ports; a switch forwards to specific ports using MAC addresses
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?
- O(n)
- O(log n)
- O(1) (Correct answer)
- O(nĀ²)
Correct answer: O(1)
Array index access is O(1) because the memory address is computed directly from the base address and index using arithmetic.
Question 6: Which software development methodology emphasizes iterative delivery, customer collaboration, and responding to change?
- Waterfall
- Agile (Correct answer)
- V-Model
- Spiral Model
Correct answer: Agile
Agile methodologies (e.g., Scrum, Kanban) prioritize iterative development, continuous feedback, and adaptability over rigid planning.
Question 7: In Boolean algebra, which law states that A + (B Ā· C) = (A + B) Ā· (A + C)?
- De Morgan's Law
- Absorption Law
- Distributive Law (Correct answer)
- Complement Law
Correct answer: Distributive Law
The Distributive Law in Boolean algebra allows OR to distribute over AND (and vice versa), similar to arithmetic distribution.
BCS Bachelor of Computer Science Degree MCQ 5
Which machine learning technique is used when labeled training data is unavailable?