Bangladesh Bank, Assistant Director(ICT), 2025 (MCQ)
Bangladesh Bank
Post: Assistant Director (ICT)
Exam Date: 07.02.2025, Exam Taker: FBS

Here Total Question: 49
To show all question with answer click: See Answer or take exam

1.
Find output-

int fun(int *p) {
*p = *p + 10;
return *p;
}
int main() {
int x = 5;
cout << fun(&x);
return 0;
}

2.
Find output

int main() {
int x = 3, y = 2;
if (x == 3)
y = 2;
else
y = 3;
cout << x << " " << y << endl;
return 0;
}

3.
Which one is a Universal Logic Gate?
4.
Which data structure is preferred for Priority Queue?
5.
What is the Work of a Rectifier?
6.
A to B transfer balance but not sent to B? Which property in ACID is responsible?
7.
What is the 2’s complement of (67)₁₀
8.
What does inductance depend on?
9.
Zener diode is a ______ conducting device.
10.
Which of the following does NOT achieve encapsulation?
11.
Which algorithm is used in email security?
12.
In the given circuit, resistors of 10Ω, 20Ω, and 30Ω are connected in parallel, and 60V is applied. What is the equivalent current?
13.
A process needs I/O operations, it switches to ______.
14.
Which of the following is NOT a web server?
15.
Which clause is executed first in an SQL query?
16.
What should be true for a Zener Diode?
17.
Which of the following is a DML (Data Manipulation Language) command?
18.
What kind of encryption is used for securing emails in transit?
19.
Digital Signature uses which algorithm?
20.
What does HTTP Status Code 500 indicate?
21.
Which data structure is best suited for implementing a scheduler in an operating system?
22.
Priority Scheduling (Non-Preemptive) with with No Arrival Time Consider the following set of processes with respective burst time and priority. (lower number = higher priority). What is the Average turnaround time?

ProcessBurst Time (BT)Priority
P1103
P211
P324
P415
P552

23.
What is the major drawback of Waterfall Model?
24.
Which of the following is a command of Data Definition Language (DDL)?
25.
Which connect the two Seas in Suez Canal?
26.
Which protocol is primarily used to securely transfer files over the internet?
27.
Who won Nobel Peace Prize in 2024?
28.
The highest peak in Bangladesh is —
29.
Strasbourg belongs to which country?
30.
A pipe can fill a tank in 4 hours, and another pipe can fill it in 6 hours. How long will they take together?
31.
A man goes 5 meters north, then 3 meters east, and then 2 meters south. What is the distance from the starting point?
32.
Mr. X uses 30% of his salary for one expense, 20% for another, and 10% for another. Remaining amount is 12,000 Taka. What is his total salary?
33.
The father’s age is 36 years. Son’s age is 16. How many years ago was the father’s age three times the son’s age?
34.
There are 8 balls, and one of them is heavier than the other 7. How many weighings are required to guarantee finding the heavier ball?
35.
Which of the following is an application of Queue data structure?
36.
Which operator should be preferred to overload as a global function rather than a member method?
37.
What are the advantages of Linear Search over Binary Search?
38.
Integration testing is the process of testing the ______ between two software units or modules.
39.
Digital signature uses which algorithm for encryption?
40.
What is Docker Hub and Docker?
41.
An IP address is given 192.168.3.0, need 254 usable hosts. What is the CIDR value and subnet mask?
42.
Which one makes data access from a database faster?
43.
Which ACID property ensures that a transaction, once committed, will remain permanent even after a system failure?
44.
Who is first ICC ODI men’s World Cup winner captain?
45.
Which sorting algorithm guarantees O(n log n) time complexity in the worst case?
46.
What is the worst case time complexity of inserting n elements into an empty linked list, if the linked list needs to be maintained in sorted order?
47.
Which one of the following is an application of Stack Data Structure?
48.
What is the best way to implement priority queue?
49.
Which device is needed to convert AC to DC?
Bangladesh Bank, Assistant Director (ICT), 2025
Bangladesh Bank • Year 2025
Bangladesh Bank
💼Post Name: Assistant Director (ICT) 📅Exam Date: 07-Feb-2025
    • ☆
      1
      Data StructureHeap
      Convert the array (56,33,48,29,99,12 and 344) into min heap.
      Initial array as a binary tree:
                56
       /      \
     33        48
    /  \      /  \
  29   99   12  344
      Swap 48 and 12: 
                56
       /      \
     33        12
    /  \      /  \
  29   99   48  344
      Swap 33 and 29: 
                56
       /      \
     29        12
    /  \      /  \
  33   99   48  344
      Swap 56 and 12: 
                12
       /      \
     29        56
    /  \      /  \
  33   99   48  344
      Swap 56 and 48: 
                12
       /      \
     29        48
    /  \      /  \
  33   99   56  344
      Final Result

      The array now satisfies the min heap property: every parent node is smaller than or equal to its children.

                12
       /      \
     29        48
    /  \      /  \
  33   99   56  344

    • ☆
      2
      Programming ConceptArray
      Write the pseudocode/ program (in any language) to print the common element between two arrays and the total number of such elements found. [assume each element in an array distinct].
      #include <iostream>
using namespace std;
int main() {
    int size1, size2;
    // Taking input size of first array
    cout << "Enter size of first array: "; 
    cin >> size1;
    int arr1[size1];
    cout << "Enter elements of first array:\n";
    for (int i = 0; i < size1; i++) {
        cin >> arr1[i];
    }
    // Taking input size of second array
    cout << "Enter size of second array: ";
    cin >> size2;
    int arr2[size2];
    cout << "Enter elements of second array:\n";
    for (int i = 0; i < size2; i++) {
        cin >> arr2[i];
    }
    // To store common elements
    int commonElements[size1 < size2 ? size1 : size2];
    int count = 0;
    // Check each element in arr1 against arr2
    for (int i = 0; i < size1; i++) {
        bool found = false;
        for (int j = 0; j < size2; j++) {
            if (arr1[i] == arr2[j]) {
                found = true;
                break;
            }
        }
        if (found) {
            // Check for duplicates
            bool alreadyExists = false;
            for (int k = 0; k < count; k++) {
                if (commonElements[k] == arr1[i]) {
                    alreadyExists = true;
                    break;
                }
            }
            if (!alreadyExists) {
                commonElements[count] = arr1[i];
                count++;
            }
        }
    }
    // Print common elements
    cout << "Common elements: ";
    for (int i = 0; i < count; i++) {
        cout << commonElements[i] << " ";
    }
    cout << endl;
    // Print total count
    cout << "Total number of common elements: " << count << endl;
    return 0;
}

      Sample I/O:
Enter size of first array: 5
Enter elements of first array: 0 20 30 40 50
Enter size of second array: 6
Enter elements of second array: 10 2 20 30 60 90
Common elements: 20 30 
Total number of common elements: 2

=== Code Execution Successful ===
      🔗 Run Online: Print Common Elements Between Two Arrays


    • ☆
      3
      Digital Logic DesignBasic Gate
      Given a logical function, find out the truth table of AB· (A+B).C


    • ☆
      4
      Operating SystemDeadlock
      Consider the following snapshot of a system where maximum instance of A, B, C and D are 3, 14, 12 and 12.

      Answer the following Question using the Bankers algorithm,

      a) Calculate the need matrix from the above table?

      b) Is the system in the safe state? Find out the safe sequence if no, justify the reason.
      a) answer:

      The Need matrix is calculated as: Need = Max - Allocation For each process, we subtract the Allocation from the Max to get the Need Matrix.



      b) answer:

      Step-by-step checking for our system:

      • P0: Needs [0, 0, 0, 0] ≤ Available [1, 5, 2, 0] → yes, so finish P0.
      • Update Available by adding P0's allocation: [1, 5, 2, 0] + [0, 0, 1, 2] = [1, 5, 3, 2]
      • P1: Needs [0, 7, 5, 0] ≤ Available [1, 5, 3, 2] → no, cannot finish yet.
      • P2: Needs [1, 0, 0, 2] ≤ Available [1, 5, 3, 2] → yes, finish P2.
      • Update Available : [1, 5, 3, 2] + [1, 3, 5, 4] = [2, 8, 8, 6]
      • P3: Needs [0, 0, 2, 0] ≤ Available [2, 8, 8, 6] → yes, finish P3.
      • Update Available : [2, 8, 8, 6] + [0, 6, 3, 2] = [2, 14, 11, 8]
      • P4: Needs [0, 6, 4, 2] ≤ Available [2, 14, 11, 8] → yes, finish P4.
      • Update Available : [2, 14, 11, 8] + [0, 0, 1, 4] = [2, 14, 12, 12]
      • P1 (rechecked): Needs [0, 7, 5, 0] ≤ Available [2, 14, 12, 12] → yes, finish P1.
      • Update Available : [2, 14, 12, 12] + [1, 0, 0, 0] = [3, 14, 12, 12]

      Since all processes can finish in this order, the system is in a safe state.

      Safe sequence: <P0, P2, P3, P4, P1>

      🎥 Video Solution: Deadlock Handling (Deadlock Avoidance - Banker's Algorithm)
    • ☆
      5
      Computer NetworkOSI/TCP-iP
      Synthia wants to send an email to her friend. He sends the email through the application and transport layer.

      (a)Mention the protocol of application layer and transport layer

      (b)Draw a diagram from the above scenario.

      Protocols used in Application Layer and Transport Layer:

      Application Layer: The protocol commonly used here for sending emails is SMTP (Simple Mail Transfer Protocol).

      Transport Layer: This layer is responsible for the reliable transmission of data between applications. The commonly used protocol at this layer is TCP (Transmission Control Protocol), which ensures that the data is delivered accurately and in order.

      ব্যাখ্যা দেখুন:

      Application Layer Protocol :Simple Mail Transfer Protocol(SMTP)

      ইমেইল পাঠানোর জন্য Application Layer-এ SMTP ব্যবহৃত হয়। SMTP এর কাজ হলো একটি কম্পিউটার থেকে অন্য কম্পিউটারে ইমেইল মেসেজ পাঠানো। এটি ব্যবহারকারীকে সহজে ইমেইল লিখে পাঠানোর সুযোগ দেয় এবং সার্ভারগুলোর মধ্যে মেসেজ ট্রান্সফার পরিচালনা করে।

      Transport Layer Protocol :TCP (Transmission Control Protocol)

      Transport Layer-এর মূল কাজ হলো ডেটা নির্ভরযোগ্যভাবে (reliably) গন্তব্যে পৌঁছে দেওয়া।

      TCP (Transmission Control Protocol) ব্যবহার করা হয় কারণ:

      • এটি ডেটাকে ছোট ছোট অংশে (segments) ভেঙে পাঠায়।
      • প্রতিটি অংশ ঠিকভাবে এবং সঠিক ক্রমে (in order) পৌঁছেছে কিনা তা যাচাই করে।
      • ডেটা হারিয়ে গেলে পুনরায় পাঠানোর ব্যবস্থা করে।

      ইমেইল একটি গুরুত্বপূর্ণ যোগাযোগ মাধ্যম। যদি মেসেজের কোনো অংশ হারিয়ে যায় বা এলোমেলোভাবে পৌঁছে যায়, তাহলে ইমেইলটি অপূর্ণ বা ভুল হয়ে যাবে। এজন্য Application Layer-এ SMTP ইমেইল পাঠানোর নিয়ম ঠিক করে দেয়, আর Transport Layer-এ TCP ডেটা সঠিকভাবে, সম্পূর্ণভাবে এবং নির্ভরযোগ্যভাবে পৌঁছানো নিশ্চিত করে।

      (b) Answer:
      The diagram illustrates the process of sending an email from the sender to the receiver

      ব্যাখ্যা দেখুন:

      Sender’s Device → Sender’s Mail Server এর সাথে SMTP protocol ব্যবহার করে যোগাযোগ করে।
      Sender’s Mail Server → ইন্টারনেটের মাধ্যমে SMTP ব্যবহার করে ইমেইলটি Receiver’s Mail Server-এ পাঠায়।
      Receiver’s Mail Server → ইমেইলটি Receiver’s Device-এ পৌঁছে দেওয়ার জন্য POP3 অথবা IMAP protocol ব্যবহার করে।


    • ☆
      6
      Database Management Systemkeys
      Find the primary key and foreign key after decomposition of the given schema (Branch_name, Acc_name, Balance, Brnach_city, Assets) and then identify which normalization it is?

      Original Schema:

      The original schema had attributes like Branch_name, Acc_name, Balance, Branch_city, and Assets.

      Initially, everything was in a single table, but it had some issues because Branch_name was part of the key for identifying branch info, while Acc_no was the key for account info.

      After Decomposition:

      1. Account Table:

      • Primary Key: Acc_no (Each account has a unique identifier).
      • Foreign Key: Branch_name (This links each account to a branch).
      • Non-key attributes (Acc_name, Balance) fully depend on Acc_no.

      2. Branch Table:

      • Primary Key: Branch_name (Each branch has a unique name).
      • Non-key attributes (Branch_city, Assets) fully depend on Branch_name.

      Why 2NF?

      2NF (Second Normal Form) means:

      • There are no partial dependencies (where attributes depend on part of the key).
      • In each table, all non-key attributes depend entirely on the full primary key.

      So, by breaking up the data into two tables, we've removed partial dependencies and made the schema 2NF.

      Explanation:

      ১. প্রথমে একক টেবিলের স্কিমা:

      আমাদের কাছে প্রথমে ছিল একটি টেবিল, এই টেবিলটির মধ্যে অ্যাট্রিবিউটগুলো হলো:

      (Branch_name, Acc_name, Balance, Branch_city, Assets)

      এই টেবিলটি ছিল একক টেবিল, কিন্তু এতে কিছু সমস্যা ছিল—বিশেষত partial dependency। এর মানে হলো, কিছু অ্যাট্রিবিউট (যেমন Branch_city এবং Assets) Branch_name এর উপর নির্ভরশীল, যেটি এই টেবিলের একটি অংশ। যাতে নরমালাইজেশন ছিলো না।

      ২. ডিকম্পোজিশন (Decomposition):

      এখন, এই সমস্যা সমাধান করতে আমরা টেবিলটিকে দুটি আলাদা টেবিলে ভাগ করি:

      Account Table:

      (Account_no, Acc_name, Balance, Branch_name)
      • Primary Key: Acc_noAcc_no একটি ইউনিক আইডেন্টিফায়ার, যা প্রতিটি অ্যাকাউন্টকে ইউনিক করে।
      • Foreign Key: Branch_nameBranch_name একটি ফরেন কী হিসেবে কাজ করে, যা Branch টেবিলের শাখার নামের সাথে সম্পর্কিত।

      Branch Table:

      • Primary Key: Branch_nameBranch_name শাখার ইউনিক আইডেন্টিফায়ার।
      • Foreign Key: এখানে কোনো ফরেন কী নেই।

      ৩. ২NF (Second Normal Form):

      Partial Dependency:

      প্রথম স্কিমাতে Branch_name ছিল একটি অংশ, যা Branch_city এবং Assets এর মতো শাখার তথ্য ধারণ করছিল। তবে, অ্যাকাউন্টের জন্য প্রাথমিক কী Acc_no পুরোপুরি অ্যাকাউন্টের তথ্য (Acc_name, Balance) নির্ধারণ করতে ব্যবহৃত হয়।

      ডিকম্পোজিশন করার পর, Account টেবিলের সমস্ত অ-প্রাথমিক অ্যাট্রিবিউট Acc_no এর উপর নির্ভরশীল হয়েছে, আর Branch টেবিলের সমস্ত অ-প্রাথমিক অ্যাট্রিবিউট Branch_name এর উপর নির্ভরশীল।

      এটি partial dependency দূর করেছে, যেখানে কোনো অ্যাট্রিবিউট প্রাথমিক কীর একটি অংশের উপর নির্ভরশীল ছিল না।

      ২NF অর্জিত হয়েছে কারণ:

      • Account টেবিলের সকল Non-key Attribute Acc_no এর উপর নির্ভরশীল।
      • Branch টেবিলের সকল Non-key Attribute Branch_name এর উপর নির্ভরশীল

      এই ডিকম্পোজিশনটি নিশ্চিত করেছে যে, আমরা partial dependency দূর করেছি এবং প্রতিটি টেবিলের Non-key Attribute তাদের পুরো primary keyএর উপর নির্ভরশীল। এর ফলে আমরা ২NF (Second Normal Form) অর্জন করেছি।


    • ☆
      7
      Computer NetworkTransmission Mode and Network Performance
      Suppose Bangladesh bank is designing a nation of communication network for office located in Dhaka and Rangpur. Their offices are connected via wide area network (WAN). The team needs to ensure that applications with low latency requirements (such as VOIP and video conferencing) can operate efficiently between these offices.
      Given:
      • Distance between Dhaka and Rangpur = 30 km
      • Speed of fiber optic link = 2 × 108 m/s
      • Link capacity = 1 Gbps
      • Average size of data packets = 15,000 bytes
      • Delay at each router/switch along the path = 5 ms
      • RTT between Dhaka and Rangpur = 50 ms

      Calculate the total network latency between office at Dhaka and Rangpur, considering the propagation delay and transmission delay.
      • Distance between Dhaka and Rangpur = 30 km = 30,000 meters
      • Speed of fiber optic link = 2 × 108 m/s
      • Link capacity = 1 Gbps = 1 × 109 bps
      • Average size of data packets = 15,000 bytes = 120,000 bits (15,000 × 8)
      • Delay at each router/switch = 5 ms
      • RTT between Dhaka and Rangpur = 50 ms
      Propagation Delay

      Propagation Delay = Distance / Propagation Speed

      = 30,000 meters / (2 × 108 m/s) = 0.00015 seconds = 0.15 ms

      Transmission Delay

      Transmission Delay = Packet Size (bits) / Link Capacity (bps)

      = 120,000 bits / (1 × 109 bps) = 0.00012 seconds = 0.12 ms

      Router Delay

      There are 1 routers and 1 switch each with 5 ms delay:

      Router Delay = 2 × 5 ms = 10 ms

      Total One-Way Latency

      Total Latency = Propagation Delay + Transmission Delay + Router Delay

      = 0.15 ms + 0.12 ms + 10 ms = 10.27 ms (Answer)

      Round Trip Time (RTT)

      RTT = 2 × One-way latency (since round trip includes going and coming back)

      RTT=2×10.27 ms=20.54 ms

      The given RTT (50 ms) is higher, which suggests additional delays are present such as queuing delay, processing delay, or other network factors not explicitly included in the simple calculation.


      🎥 Video Solution: Network Latency Calculation

      🎥 Video Solution: Network Delay Types & Round-Trip Time Explained (in Bangla)


    • ☆
      8
      Data Center & VirtualizationOthers
      Bangladesh Bank have client server and the communicate with Mail server, DNS server, web server. Bangladesh Bank want to ensure the security using firewall on those server. Draw a diagram with the scenario.

      The diagram represents a secure network architecture for Bangladesh Bank, where client-server communication is protected using firewalls:

      The diagram illustrates a secure client-server architecture for Bangladesh Bank, where clients communicate with different servers through a firewall to ensure network security.

      Clients (Users): Users access Bangladesh Bank's online services through the Internet using web browsers or mobile applications.
      Perimeter Firewall: The first firewall acts as a security gateway between the Internet and the bank's servers. It filters incoming and outgoing traffic, allowing only authorized requests while blocking unauthorized access and cyber attacks.
      DMZ (Demilitarized Zone): Public-facing servers are placed in the DMZ to minimize the risk of exposing the internal network. These include:
      Web Server – Handles HTTP/HTTPS requests from clients.
      Mail Server – Provides email services using SMTP/SMTPS protocols.
      DNS Server – Resolves domain names to IP addresses for client requests.
      Internal Firewall: A second firewall separates the DMZ from the bank's internal network. It allows only necessary communication between the public servers and the internal systems, preventing attackers from directly accessing sensitive resources.
      Application Server: This server hosts Bangladesh Bank's core banking applications and business logic. It processes requests received from the Web Server and communicates with the Database Server.
      Database Server: Stores confidential banking information such as customer records, transaction data, and account details. It is accessible only by the Application Server and is never exposed directly to the Internet.

      Security Features

      Filters unauthorized network traffic.
      Allows only required ports and services (HTTP/HTTPS, SMTP, DNS).
      Protects internal servers from external attacks.
      Isolates public-facing servers using a DMZ.
      Restricts access to sensitive banking data through an Internal Firewall.
      Enhances confidentiality, integrity, and availability of banking services.

      Conclusion:
      By deploying perimeter and internal firewalls along with a DMZ architecture, Bangladesh Bank ensures that client requests are securely processed while protecting its critical application and database servers from unauthorized access and cyber threats


    • ☆
      9
      Non Technical QuestionNon tech

      1. ∫ from 0 to 2 of (2x² + 3x) dx?

      2. In Bangladesh Bank there are 6 Assistant directors and 4 Deputy Directors (DD's). Each AD brings a bag, while only half of the DDs bring a bag. If a bag is selected at random from all the bags, what is the probability that the chosen bag belongs to a Deputy Director (DD)?

      3. Translations:ক) শনিবার হতে সে অফিস আসছে না
        খ) আপনার ব্যাংঙ্ক একাউন্টের স্থিতি জানার জন্য মোবাইল ব্যাংকিং এপ্লিকেশনে লগিন করুন

      4. Short notes on "AI and machine language mitigate challenge of cyber attack on banking system"
    • ☆
      10
      MCQMCQ
      1. Which the universal gate? Ans.: Nor and NAND gate
      2. What is best way to implement priority queue? Ans.: Heap
      3. Reverse voltage Zener diode is used as? Ans.: Voltage Regulator
      4. What kind of encryption is used for email? Ans.: TLS
      5. Which algorithm used digital signature? Ans.: RSA
      6. What is HTTP code 500? Ans.: Internal Server Error
      7. Which one make data access from a database faster? Ans.: Indexing
      8. Which device that's converts AC to DC? Ans.: Rectifier
      9. Priority scheduling math no arrival time, find the average TAT? Ans.: 0
      10. Find the current from a circuit, where voltage & resistance already given? Ans.: 0.5A
      11. What factors doesn’t affect inductance? Ans:
      12. What is the major drawback of waterfall model? Ans: lack of flexibility
      13. What is not a web server type? Ans:
      14. Docker containers within a single application?
      15. A circular queue has size 6, front 2nd index, rear 5th index. What will the position of rear after insert a value in front?
      16. During sending email that message should not alter/modify, which database properties ensure this?
      17. In binary tree what are the root value of the following 56, 58, 12, 78?
      18. Write the 2’s complement of (65)16.
      19. A process needs I/O operations, it switches to …..waiting state.
      20. Which the command of DDL?
      21. Integration testing is the process of testing the interface between two software or modules.
      22. SUEZ canal connects which two seas? Ans.: Mediterranean sea and the Red sea
      23. First ICC ODI Men's World Cup winner captain? Ans.: Clive Lloyd
      24. Who won the Nobel peace prize in 2024? Ans.: Nihon Hidankyo
      25. What the highest peak of Bangladesh? Ans.: Tazingdong
      26. Strasbourg belongs to which country? Ans.: France
      27. A pipe can fill a tank in 4 hours, and another pipe can fill it in 6 hours. How much time will they take to fill the tank together? Answer: 2.4 hours
      28. What is the distance from A's starting point to his final position? Answer: 4.24 meters
      29. Mr. X uses 30% of his salary for expenses, 20% for his final position, and 10% for another. His remaining amount is 12,000 Taka. What is his total salary? Ans.: 30,000
      30. The father's age is 36 and the son's age is 16. How many years ago was the father's age three times the son's age? Ans.: 6 years ago
      31. There are 8 balls, and one ball is heavier than the other 7, which are of the same weight. How many weighing are required to guarantee finding the heavier ball? Ans: 2
      32. 192.168.16.10, which the subnet address of this ip address?
      33. Find the output. 
            int main() {
      int x=3;
      int y=2;
      if (x==2)
        y=3;
      else
        y=2;
      printf("%d %d\n", x, y);
    }

        Ans.: 2, 3

Bangladesh Bank, Assistant Programmer, 2023 (MCQ)
Bangladesh Bank
Post: Assistant Programmer
Exam Date: 03.02.2023, Exam Taker: BIBM

Here Total Question: 25
To show all question with answer click: See Answer or take exam

1.
print(9 // 2)
2.
Which of the following operators cannot be overloaded in C/C++?
3.
Assume that the size of an integer is 4 bytes. Predict the output of the following program:


#include
int main() {
int i = 12;
int j = sizeof(i++);
printf("%d %d", i, j); return 0;
}

4.
Which of the following algorithm design techniques is used in finding all pairs of shortest distances in a graph?
5.
Access time of the symbolic table will be logarithmic if it is implemented by-
6.
When was International Mother Language Day declared by UNESCO?
7.
If the radius is increased by 100%, by how much will the area of the circle be increased?
8.
Which data structure allows insertion and deletion of elements from both ends?
9.
Which of the following belongs to the algorithm paradigm?
10.
What is the result of compiling and running the following code?

public class Test {
public static void main(String[] args) {
int[] a = new int[0];
System.out.print(a.length);
}
}

11.
World environment day is celebrated on _____ of every year.
12.
In a complete k-array, every internal node has exactly k children. The number of leaves in such a tree with n internal nodes is-
13.
The time taken by NP-class sorting algorithm is-
14.
Determine Output:

void main() {
struct xx {
int x=3;
char name[] = "hello";
};
struct xx *s = malloc(sizeof(struct xx));
printf("%d", s->x);
printf("%s", s->name);
}

15.
What is the complexity of Merge sort?
16.
Which of the following is a non-linear data structure?
17.
Which of the following is not the required condition for a binary search algorithm?
18.
Which of the following correctly accesses the seventh element stored in arr, an array with 100 elements?
19.
The _____ system may manage a high degree of interaction between processes and is very useful for high-speed and real-time processing.
20.
Table employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE. The SQL statement: SELECT COUNT (*) FROM employee WHERE SALARY > ALL (SELECT SALARY FROM EMPLOYEE);
21.
Design pattern for hierarchical structure is _____
22.
How many addresses are there in the network 200.10.10.10/20?
23.
Which is suitable subnet mask for 200 hosts?
24.
Determine Output:

void main() {
int i=i++, j=j++, k=k++;
 printf("%d %d %d", i, j, k);
}

25.
The IPv4 is encapsulated to IPv6 which is known as _____.
Bangladesh Bank, Assistant Maintenance Engineer, 2023 (MCQ)
Bangladesh Bank
Post: Assistant Maintenance Engineer
Exam Date:04/02/ 2023, Exam Taker: BIBM

Here Total Question: 26
To show all question with answer click: See Answer or take exam

1.
Which country is known as the 'Rainbow Nation'?
2.
Which one of the following is related to the services provided by the cloud?
3.
How many steps are in the waterfall model?
4.
Which is the third largest economic country?
5.
Where is data warehousing used?
6.
Which of the following is protected by copyright ACT?
7.
A basic memory storage element in a digital system is:
8.
What is the use of data cleaning?
9.
The greatest negative number which can be stored in a computer that has 8-bits work length and uses 2's complement arithmetic is:
10.

320 + 320 + 320=?

11.
Who won the Ballon d'Or in 2022?
12.
Small logical units where data warehouses hold large amounts of data is known as:
13.
Which of the following is an essential process in which intelligent methods are applied to extract data patterns?
14.
Two resistors R1 and R2 are connected in parallel with R1
15.
What type of computing technology refers to services and applications that typically run on a distributed network through virtualized resources?
16.
Cloud Computing architecture is a combination of:
17.
Service that generally focuses on the hardware following which one of the following services models?
18.
Which of the following pairs is an example of intra-domain routing protocols?
19.
Which of the following cannot be used as a public IP address?
20.
Which one of the following cloud concepts is related to sharing and pooling the resources?
21.
Which command loads a new version of the Cisco IOS into a router?
22.
Which of the following provides the ability to query information from the database and insert tuples into, delete tuples from, and modify tuples in the database?
23.
The lead character in the film 'The Bandit Queen' has been played by:
24.
A CPU generates 32-bit virtual addresses. The page size is 4 KB. The processor has a translation look-aside buffer (TLB) which can hold a total of 128 page table entries and is 4-way set associative. The minimum size of the TLB tag is:
25.
Page fault occurs when:
26.
When a host on network A sends a message to a host on network B, which address does the router look at?
Bangladesh Bank, Assistant Maintenance Engineer, 2023

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Bangladesh Bank, Assistant Programmer, 2023
Assistant Programmer • Year 2023
Bangladesh Bank
💼Post Name: Assistant Programmer 📅Exam Date: 03-Feb-2024
    • ☆
      1
      Data StructureHashing
      Consider strong entries with integer keys. Suppose the hash function is h (k) = k mod 13. Insert in the given order entries with keys 10, 3, 6, 16, 17, 19 in to the hash table using linear probing to resolve collisions. Show all the work.

      The hash function is given as h(k)=k mod 13.
      The table size is 13, meaning we have indices from 0 to 12.

      Step-by-Step Insertion Process

      Key: 10
      Hash value: h(10) = 10 mod 13 = 10. Insert 10 at index 10.

      Key: 3
      Hash value: h(3) = 3 mod 13 = 3. Insert 3 at index 3.

      Key: 6
      Hash value: h(6) = 6 mod 13 = 6. Insert 6 at index 6.

      Key: 16
      Hash value: h(16) = 16 mod 13 = 3. Index 3 is occupied. Use linear probing and insert 16 at index 4.

      Key: 17
      Hash value: h(17) = 17 mod 13 = 4. Index 4 is occupied. Use linear probing and insert 17 at index 5.

      Key: 19
      Hash value: h(19) = 19 mod 13 = 6. Index 6 is occupied. Use linear probing and insert 19 at index 7.

      Final Hash Table

      IndexValue
      0-
      1-
      2-
      33
      416
      517
      66
      719
      8-
      9-
      1010
      11-
      12-

      Summary
      The final hash table after inserting all keys using linear probing is as follows:

      [ - , - , - , 3 , 16 , 17 , 6 , 19 , - , - , 10 , - , - ]


    • ☆
      2
      Computer SecurityThreats
      Describe a man-in the middle attack on the Diffie-Hellman key exchange protocol in which the adversary generates two public key pairs for the attack.

      Man-in-the-Middle (MITM) Attack on Diffie–Hellman Key Exchange

      In a MITM attack on Diffie–Hellman (DH), an attacker (Mallory) sits between Alice and Bob, intercepts their public keys, and replaces them with her own. Since basic DH provides no authentication, Alice and Bob cannot verify the real sender of the public key.

      Normal DH (No Attack)

      • Public parameters: prime p, generator g
      • Alice selects private key a, sends public key A = ga mod p
      • Bob selects private key b, sends public key B = gb mod p
      • Shared key: K = gab mod p

      MITM Attack (Attacker Generates Two Key Pairs)

      Step 1: Interception
      Mallory intercepts Alice’s public key A and Bob’s public key B.

      Step 2: Mallory Creates Two Private Keys
      Mallory chooses two private keys: m1 (for Bob) and m2 (for Alice).

      Step 3: Mallory Generates Two Public Keys
      Mallory computes:
      M1 = gm1 mod p
      M2 = gm2 mod p

      Step 4: Key Replacement (Fake Public Keys)
      Mallory sends M1 to Bob pretending it is from Alice.
      Mallory sends M2 to Alice pretending it is from Bob.

      Step 5: Two Different Shared Keys are Formed

      • Alice computes: K1 = (M2)a mod p (Alice–Mallory key)
      • Bob computes: K2 = (M1)b mod p (Bob–Mallory key)
      • Mallory can compute both keys:
        K1 = (A)m2 mod p and K2 = (B)m1 mod p

      Result

      • Alice and Bob do not share the same secret key.
      • Mallory shares one key with Alice and another key with Bob.
      • Mallory can read, modify, and re-encrypt messages between them.

      Why It Works

      Because basic Diffie–Hellman does not provide authentication, public keys can be replaced without detection.

      Prevention

      • Use Authenticated Diffie–Hellman
      • Use Digital Signatures / Certificates (PKI)
      • Use TLS (DHE/ECDHE + certificates)

    • ☆
      3
      Computer SecurityCIA
      Preserving confidentiality integrity and availability of data is a restatement of the concern over falsification, interception, masquerade and denial of service. Explain how the first three concepts relate to the last four.

      The concepts of confidentiality, integrity, and availability (CIA triad) directly address the security concerns of falsification, interception, masquerade, and denial of service.

      Confidentiality ensures that sensitive information is accessible only to authorized users, protecting against interception, where data could be accessed or stolen by unauthorized parties.

      Integrity guarantees that data remains accurate and unaltered, defending against falsification, which involves malicious modification of data, and masquerade, where attackers assume false identities to tamper with information.

      Availability ensures that information and resources are accessible when needed, countering denial of service (DoS) attacks that aim to make systems or data unavailable to legitimate users.

      By maintaining confidentiality, integrity, and availability, organizations can effectively mitigate these four major security threats and enhance overall data protection.


    • ☆
      4
      Programming Concept
      Given two integers A and B as input write a program to compute the least common multiple of A and B.
      #include <stdio.h>
int main () {
int n1, n2, max;
printf ("Enter two positive integers: ");
scanf ("%d %d", &n1, &n2);
// maximum number between n1 and n2 is stored in max

max = (n1> n2) ? n1: n2;
while (1) {
// Check if max is divisible by both n1 and n2
if ((max% n1 == 0)&& (max % n2 ==0)) {
 // If true, max is the LCM of n1 and n2
printf("The LCM of %d and %d is %d.", n1,n2,max);
break;
}
++max;
}
return 0;
}
          
Sample I/O:
Enter two positive integers: 14 8
The LCM of 14 and 8 is 56.
=== Code Execution Successful ===
      🔗 Run Online: LCM of two integer

    • ☆
      5
      Programming Concept
      Consider the following code:

      Public class Class A {
      Public void m1 () {}
      Public void m2 (int i) {}
      Public void m3 (int i) {}
      Public static void m4 (int i) {}
      Public class class B extends class A {
      Public static void ml (int i) {}
      Public void m2 (int i) {}
      Public void m3 (string s) {}
      Public static void m4 (int i) {}

      Mention which of the methods overload, override and hied supper class methods. What about the remaining method?


    • ☆
      6
      Data StructureHeap
      Given the adjacency list representation of a complete binary tree with 7 vertices, write the equivalent adjacency matrix representation. Assume that the vertices are numbered from 1 to 7 as in a binary heap.

      Complete Binary Tree Bangladesh Bank AP 2023 Answer Adjacency List Representation

      VertexConnected Vertices
      12, 3
      24, 5
      36, 7
      4
      5
      6
      7

      Adjacency Matrix Representation

      1234567
      10110000
      20001100
      30000011
      40100000
      50100000
      60010000
      70010000

    • ☆
      7
      Database Management SystemKeys
      Suppose that we have a relational database with the following table. Underlined one represent primary key

      Movies (mid, title, year)
      People (pid, name)
      Genres (gid, genre)
      HasRole (pid, mid, role)
      Has Genre (gid, mid)

      Write a SQL query to return the number of movies that are romantic comedies.
      SELECT COUNT(*) FROM Movies, Genres, HasGenre WHERE Movies.mid = HasGenre.mid AND HasGenre.gid = Genres.gid AND Genres.genre = "romantic comedy";

    • ☆
      8
      Computer NetworkOSI/TCP-IP
      In order to prevent that the company decided to add end to end encryption techniques which layer of the OSI model is suitable to work in considering parameters like development time, software maintainability and development cost, Give reasons for your concepts.

      Suitable OSI Layer for End-to-End Encryption

      To implement end-to-end encryption (E2EE) while considering development time, software maintainability, and development cost, the most suitable layer of the OSI model is the Application Layer (Layer 7).

      Reasons for Choosing the Application Layer

      • Faster Development Time: Encryption at the application layer can be implemented directly within the application logic. Developers do not need to modify lower-level networking protocols, which significantly reduces development time.
      • Better Software Maintainability: Application-layer encryption is easier to update, debug, and maintain. Changes can be made without affecting the underlying network infrastructure or operating system.
      • Lower Development Cost: No changes are required in routers, switches, or transport-layer implementations. This avoids hardware upgrades and reduces overall implementation cost.
      • True End-to-End Security: Data is encrypted at the sender’s application and decrypted only at the receiver’s application. Intermediate systems (routers, proxies, servers) cannot read the data.
      • Platform Independence: Application-layer encryption works across different networks, protocols, and platforms without compatibility issues.

      Why Not Lower Layers?

      • Transport Layer (e.g., TLS): Requires certificate management and protocol-level integration, increasing complexity and cost.
      • Network/Data Link Layers: Require hardware or OS-level changes, leading to high cost and poor maintainability.

      Considering development time, cost efficiency, and long-term maintainability, implementing end-to-end encryption at the Application Layer is the best and most practical choice.


    • ☆
      9
      Computer NetworkOthers
      Draw A class diagram. A token-ring based local area network (LAN) is a network consisting of nodes in which network packets are sent around. Every node has a unique name within the network, and refers to its next node. Different kinds of nodes exist: Workstations are originators of messages; servers and printers are network nodes that can receive messages. Packets contain an originator a destination and content, and are sent around on a network. A LAN is a circular configuration of nodes.
      [source:visual-paradigm.com]

    • ☆
      10
      Object Oriented ProgrammingBasic
      Determine overloading method, overridden method and hide super class method?

      Method Overloading, Method Overriding, and Method Hiding

      1. Method Overloading

      Method overloading occurs when multiple methods in the same class have the same method name but different parameter lists (different number, type, or order of parameters).

      • Resolved at compile time
      • Improves code readability and flexibility

      Example:


      int add(int a, int b)
int add(int a, int b, int c)

      2. Method Overriding

      Method overriding happens when a subclass provides a new implementation of a method that is already defined in its superclass with the same method signature.

      • Occurs in inheritance
      • Resolved at runtime (runtime polymorphism)
      • Method must be non-static

      Example:


      class Parent {
  void show() { }
}
class Child extends Parent {
  void show() { }
}

      3. Method Hiding (Hiding Superclass Method)

      Method hiding occurs when a static method in a subclass has the same name and signature as a static method in the superclass.

      • Applies only to static methods
      • Resolved at compile time
      • Not true overriding

      Example:


      class Parent {
  static void display() { }
}
class Child extends Parent {
  static void display() { }
}

      Summary Comparison

      • Overloading: Same class, same method name, different parameters
      • Overriding: Subclass redefines superclass method (non-static)
      • Hiding: Static method in subclass hides static method of superclass

    • ☆
      11
      Non Technical QuestionNon tech
      Growing use to technology in the Financial Service Industry.

      11. Translation English to Bangla.

      12. Translation Bangla to English.

      13. If x is an Integer and x + 1/x= 17/4, then value of x – 1/x =?

      14. A basketball team has won 15 games and lost 9. If these games represent 16% of the games to be played, then how many more games must the team win to average 75% for the season?

      15. Students of a class are made to stand in rows. If 4 students are extra in each row, then there would be 2 rows less. If four students are less in each row, then there would be 4 more rows. What is the number of students in the class?

      16. In the given figure, PQT is a right triangle then what is the area of square QRST.

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