20+ DTA Public School Interview Questions and Answers

Program to find the Nth term in an infinite series

• The series has a repeating pattern

• Use modulo operator to find the index of the repeating pattern

• Calculate the value of Nth term based on the pattern

Program to find the longest palindrome substring in a given string.

• Iterate through the string and check for palindromes of different lengths

• Store the longest palindrome found

• Return the length and substring

I am highly proficient in HTML, CSS, and JavaScript.

• Extensive experience in building responsive web applications using HTML, CSS, and JavaScript

• Strong understanding of front-end frameworks like React, Angular, or Vue.js

• Familiarity with CSS preprocessors like SASS or LESS

• Knowledge of modern JavaScript ES6+ features and best practices

• Experience in optimizing web performance and cross-browser compatibility

Implement strategies to resolve backlog of requests from microservice two due to microservice three breaking.

• Identify the root cause of the issue in microservice three and fix it.

• Implement circuit breaker pattern to handle failures and prevent cascading failures.

• Implement retries with exponential backoff for failed requests from microservice two to microservice three.

• Scale up microservice three to handle increased load from microservice two.

• Implement message queues or asynchr...read more

The process for registering XML Publisher Report

• Create a data model for the report

• Create a template for the report using RTF or XSL-FO

• Upload the template to the server

• Create a report definition using the data model and template

• Register the report definition with the XML Publisher server

Program to find second max in a list and its time complexity

• Sort the list in descending order and return the second element

• Traverse the list and keep track of the maximum and second maximum elements

• Time complexity: O(n)

Abstract class is a class that cannot be instantiated and may contain abstract methods, while interfaces only define method signatures.

• Abstract classes can have both abstract and non-abstract methods, providing a partial implementation for subclasses.

• Interfaces can only have method signatures, requiring implementing classes to define the actual implementation.

• Abstract classes can have constructors, member variables, and method implementations, while interfaces cannot.

• Abstract...read more

MongoDB is a popular choice as an alternative to Elasticsearch due to its flexibility and scalability.

• MongoDB is a document-oriented NoSQL database that allows for flexible schema design, making it a good fit for a wide range of use cases.

• MongoDB also offers powerful indexing and querying capabilities, similar to Elasticsearch.

• MongoDB's horizontal scalability and sharding capabilities make it suitable for handling large volumes of data, just like Elasticsearch.

• MongoDB has a s...read more

Our application is a cloud-based project management tool that helps teams collaborate and track progress.

• Utilizes React for front-end development

• Uses Node.js for back-end development

• Integrates with third-party APIs for additional functionality

Conventional URLs use query parameters while attribute URLs use route parameters in .NET Core Web API.

• Conventional URLs use query parameters to pass data in the URL, while attribute URLs use route parameters in the route template.

• Conventional URLs are more flexible as they allow for optional parameters, while attribute URLs are more rigid in their structure.

• Attribute URLs are more readable and provide a cleaner way to define routes in the code.

• Example: Conventional URL - /api...read more

To ensure maintainability, I follow coding best practices, use version control, write clean and modular code, document thoroughly, and conduct regular code reviews.

• Follow coding best practices such as SOLID principles and design patterns

• Use version control system like Git to track changes and collaborate with team members

• Write clean and modular code to make it easier to understand and update

• Thoroughly document code, including comments and README files

• Conduct regular code revi...read more

Differences between Oracle EBS 12.1 and 12.2 Technical Architecture

• 12.2 has a web-based interface while 12.1 has a client-server interface

• 12.2 has a multi-node architecture while 12.1 has a single-node architecture

• 12.2 has a more modular architecture with fewer dependencies

• 12.2 has a more streamlined upgrade process compared to 12.1

I have utilized design patterns such as Singleton, Factory, and Observer in my projects.

• Singleton pattern for ensuring a class has only one instance

• Factory pattern for creating objects without specifying the exact class

• Observer pattern for defining a one-to-many dependency between objects

The application architecture follows a microservices design pattern with a front-end client communicating with multiple back-end services.

• Front-end client communicates with back-end services via APIs

• Back-end services are independent and handle specific functionalities

• Data is stored in a distributed database for scalability

• Use of containerization for deployment and scaling

• Message queues for asynchronous communication between services

MongoDB is a NoSQL database while PostgreSQL is a relational database management system.

• MongoDB is schema-less, allowing for flexible data models, while PostgreSQL enforces a predefined schema.

• MongoDB uses a document-based data model with JSON-like documents, while PostgreSQL uses tables with rows and columns.

• MongoDB is better suited for applications with large amounts of unstructured data, while PostgreSQL is better for complex queries and transactions.

• MongoDB is horizontall...read more

OAuth authorization is a protocol that allows a user to grant limited access to their resources without sharing their credentials.

• OAuth allows a user to grant access to their resources to a third-party application without sharing their credentials.

• It involves the exchange of tokens between the user, the third-party application, and the resource server.

• OAuth uses authorization codes, access tokens, and refresh tokens to authenticate and authorize access.

• OAuth 2.0 is the curren...read more

I have utilized design patterns such as Singleton, Factory, and Observer in my work.

• Singleton pattern for ensuring a class has only one instance

• Factory pattern for creating objects without specifying the exact class

• Observer pattern for defining a one-to-many dependency between objects

Program in .NET to output characters appearing more than two times consecutively in a given string.

• Iterate through the string and check if the current character is the same as the previous one.

• Keep track of the count of consecutive characters and output those that appear more than two times.

• Use a StringBuilder to efficiently build the output string.

Use a hash set to efficiently find duplicate strings in a list.

• Create a hash set to store unique strings.

• Iterate through the list of strings, adding each string to the hash set.

• If a string is already in the hash set, add it to the list of duplicates.

• Return the list of duplicate strings.

Repository Pattern helps in separating data access logic from business logic, improving code maintainability.

• Encapsulates the logic required to access data from the data source, providing a clean separation between data access and business logic.

• Promotes code reusability by allowing different parts of the application to use the same data access logic without duplicating code.

• Facilitates unit testing by enabling the mocking of data access logic, making it easier to test busine...read more

Use Angular HttpClient to call web api and display data in UI

• Create a service in Angular to make HTTP requests using HttpClient module

• Subscribe to the observable returned by HttpClient.get() method to fetch data

• Bind the fetched data to UI elements in the component template

MS SQL for structured data, NoSQL for unstructured data or high scalability

• Use MS SQL for structured data with complex relationships and transactions

• Use NoSQL for unstructured data or high scalability requirements

• Consider using a combination of both for different parts of the application

• Example: Use MS SQL for financial transactions and NoSQL for user profiles

A Logger is a software component used to record events, messages, and errors during the execution of a program.

• Loggers are used to track the flow of a program and provide insights into its behavior.

• They can be configured to log different levels of messages such as INFO, DEBUG, WARN, ERROR, etc.

• Loggers can write logs to various outputs like console, files, databases, or remote servers.

• They help in troubleshooting issues, monitoring performance, and auditing activities.

• Popular ...read more

Unions are used to combine multiple variables of different data types into a single variable.

• Unions allow for efficient use of memory by sharing the same memory location for different variables.

• They are commonly used in low-level programming for hardware access and data serialization.

• An example of a union is a struct that contains a float and an integer, where changing the value of one will affect the other.