BPSC (Ministry of Food), Network/Website Manager, Exam: 21.05.2025 (CSE) | প্রশ্ন ও সমাধান

Written question 1Programming

Explain the concept of polymorphism in Object-oriented Programming with example?

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Written question 2Algorithms

Write an Algorithm to detect a cycle in a directed graph.

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Written question 3Cyber Security

What is a Man-inThe Middle (MitM) attack? How can it be prevented?

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Written question 4Programming

Write a C program to find the sum of digits of an integer number using "recursion".

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Written question 5Algorithms

Write down the Pseudo Code for recursive binary search algorithm. Use the following function 5 definition: binarySearch (array, target, low, high).

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Written question 6Networking

Find the network address, subnet mask, broadcast address, and usable host IP range for the following IP address: 192.9.205.31/16.

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Written question 7Networking

Show the pictorial representation of TCP 3-way handshaking protocol for establishing a connection between a server and a client.

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Written question 8Digital Logic

Design a full adder using two half adders and an OR gate?

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Written question 9Operating Systems

Compare "Paging" and "Segmentation" memory management technique?

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Written question 10Computer Architecture

Write down the names of different stages of instruction pipelining in a multi-cycle datapath architecture. What is a data-hazard in a pipelined datapath?

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Written question 11Database

Explain the differences between Second Normal Form (2NF) and Third Normal Form (3NF) with examples.

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Written question 12Database

Given a Patient table in a hospital database below.

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Written question 13Software Engineering

Write down the differences between Agile model and Waterfall model in Software development. What is white box testing?

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Written question 14Cloud & Emerging Tech

Briefly explain supervised learning, unsupervised learning & reinforcement learning.

Model answer

Machine learning approaches differ mainly in what feedback (if any) the algorithm receives while learning from data.

Type	Data used	Goal	Example
Supervised	Labeled data (input + correct output)	Learn input-to-output mapping to predict labels for new data	Spam filter trained on emails marked "spam"/"not spam"
Unsupervised	Unlabeled data	Discover hidden patterns/groupings on its own	Grouping streaming viewers by watching habits (clustering)
Reinforcement	No fixed dataset - agent interacts with an environment	Maximize cumulative reward through trial and error	Training an AI to play chess or a self-driving car to navigate safely

Supervised learning is like learning with a teacher: every training example comes with the "correct answer," and the model is penalized for wrong predictions (e.g. regression, classification).
Unsupervised learning has no teacher or labels; the algorithm must find structure by itself - common tasks are clustering (grouping similar items) and dimensionality reduction.
Reinforcement learning involves an agent that takes actions in an environment, receiving rewards or penalties; over many trials it learns a policy that maximizes long-term reward, without being told the "correct" action directly.

Exam takeaway: Supervised learns from labeled examples; Unsupervised finds patterns without labels; Reinforcement learns via reward/penalty feedback from interacting with an environment.

Written question 15Cyber Security

Briefly explain phising attack and denial-of-service (DoS) attack.

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