Virtusa Consulting Services PMO Lead Interview Questions and Answers

Q1. Remove duplicates in an array
Ans. 
Use a hash set to remove duplicates in an array of strings
• Create a hash set to store unique elements

• Iterate through the array and add each element to the hash set

• Convert the hash set back to an array to get the unique elements
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Q2. What is react virtual DOM
Ans. 
React virtual DOM is a lightweight copy of the actual DOM, used for efficient updates and rendering in React applications.
• Virtual DOM is a concept where a lightweight copy of the actual DOM is created in memory.

• React uses virtual DOM to efficiently update and render components without directly manipulating the actual DOM.

• When changes are made to the virtual DOM, React calculates the most efficient way to update the act...read more
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Q3. React hooks with example
Ans. 
React hooks are functions that let you use state and other React features without writing a class.
• React hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that allows you to perform side effects in functional components.

• useContext() is a hook that allows you to use the con...read more
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Q1. Performance optimisation
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Q1. Lods,parameters
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Q1. Sql queries on analytical queries
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Q2. Different constraints and join methods
Ans. 
Different constraints and join methods in database queries
• Constraints in database queries ensure data integrity and enforce rules on data

• Join methods in database queries are used to combine rows from two or more tables based on a related column between them

• Examples of constraints include primary key, foreign key, unique key, and check constraints

• Examples of join methods include inner join, outer join (left, right, full
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It was mostly on sub queries.

Q1. Questions on core java concepts
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Q2. Questions on SQL and Springboot
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Q1. Questions on Collection framework.
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Q2. Questions on Springboot and core java
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Q1. Scenario based question
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Q2. Stream API questions
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Q1. How are you doing
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Q2. Which was your previous institution
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Q1. Introduce about college experience?
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Q2. Some hidden things you liked in your management?
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Choose your own topic and explain to others?

Q1. How much salary do you expect?
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Q2. Why should we hire you?
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Q1. Graphql , Web workers vs Service workers
Ans. 
GraphQL is a query language for APIs, Web workers run scripts in background threads, Service workers are scripts that run in the background and can intercept network requests.
• GraphQL is a query language for APIs that allows clients to request only the data they need.

• Web workers run scripts in background threads separate from the main browser thread, improving performance by handling tasks concurrently.

• Service workers a...read more
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Q1. SOA vs Micro Service
Ans. 
SOA focuses on large, monolithic services while Microservices are small, independent services.
• SOA is a centralized architecture with shared services, while Microservices are decentralized with each service having its own database.

• SOA is typically implemented using ESB (Enterprise Service Bus), while Microservices communicate via lightweight protocols like HTTP or messaging queues.

• SOA is more suitable for large enterpri...read more
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Round robin base in os schedule