NICE Interview Questions, Process, and Tips

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Q1. Nice and nice and nice and nice
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Q2. Rjd ke liye message Kiya tha na
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Aptitude test and attribute of the day of the day of the day of

There is aptitude+DBMS+OS+coding online test round

Q1. OOP-Polymorphism
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Q2. DSA-Mirror image of binary tree
Ans. 
Mirror image of a binary tree involves swapping the left and right children of each node.
• Start with the root node and recursively swap the left and right children of each node.

• Repeat this process for all nodes in the binary tree.

• The resulting tree will be the mirror image of the original binary tree.
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Q3. SQL query related to joins
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Q4. Discussion on projects and internship experience
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1st round had aptitude , OS , and software development cycle qns , and then 2 coding questions easy and medium level

Q1. DSA- oops questions were asked
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Q2. SQl queries were asked
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Q1. Authorisation and authentication difference
Ans. 
Authentication verifies the identity of a user, while authorization determines what actions they are allowed to perform.
• Authentication confirms the user's identity through credentials like passwords or biometrics.

• Authorization controls the access rights of authenticated users to specific resources or actions.

• Example: Logging into a system with a username and password is authentication, while being able to view/edit cer
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Q1. Explain Feature selection Techniques
Ans. 
Feature selection techniques are methods used to select the most relevant features for a predictive model.
• Filter methods: Select features based on statistical measures like correlation, chi-squared, or mutual information.

• Wrapper methods: Use a specific model to evaluate the importance of features by training and testing subsets of features.

• Embedded methods: Features are selected as part of the model training process, l...read more
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Q2. Difference between Covariance and Correlation
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Covariance measures the relationship between two variables, while correlation measures the strength and direction of a relationship.
• Covariance can be positive, negative, or zero, indicating the direction of the relationship.

• Correlation is always between -1 and 1, with 1 indicating a perfect positive relationship, -1 indicating a perfect negative relationship, and 0 indicating no relationship.

• Covariance is affected by t...read more
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Q1. Handle dynamic dropdowns in selenium
Ans. 
Use Select class in Selenium to handle dynamic dropdowns by locating the dropdown element and selecting options by visible text, value, or index.
• Locate the dropdown element using findElement method

• Create a Select object using the dropdown element

• Select options by visible text, value, or index using selectByVisibleText, selectByValue, selectByIndex methods
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Q1. What is BDD and TDD
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BDD stands for Behavior Driven Development and TDD stands for Test Driven Development.
• BDD focuses on the behavior of the system from the user's perspective.

• TDD focuses on writing tests before writing the actual code.

• BDD uses natural language to describe the behavior of the system.

• TDD helps in ensuring that the code meets the requirements and is well-tested.

• Both BDD and TDD help in improving the quality of the software
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Q2. What is JUnit and Mockito
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JUnit is a unit testing framework for Java, while Mockito is a mocking framework used for creating mock objects in unit tests.
• JUnit is used for writing and running repeatable automated tests to ensure code behaves as expected.

• Mockito is used to create mock objects to simulate the behavior of real objects in unit tests.

• Both JUnit and Mockito are commonly used in test-driven development (TDD) to ensure code quality and r
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Q3. What is microservices architecture
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Microservices architecture is an architectural style that structures an application as a collection of loosely coupled services.
• Each service is self-contained and can be developed, deployed, and scaled independently.

• Services communicate with each other over lightweight protocols like HTTP or messaging queues.

• Microservices allow for flexibility, scalability, and easier maintenance compared to monolithic architectures.

• Ex...read more
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Q4. Why HashSet has default size 16
Ans. 
HashSet default size 16 for performance balance between memory usage and lookup time.
• Default size 16 provides a good balance between memory usage and lookup time.

• Choosing a power of 2 size helps in distributing elements evenly across buckets.

• Resizing the HashSet is expensive, so starting with a larger size reduces the need for resizing.

• Example: If the default size was too small, it would lead to more collisions and deg
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Q5. What is diff between ActiveMQ and RabbitMQ
Ans. 
ActiveMQ is Java-based messaging broker while RabbitMQ is a message broker that implements the Advanced Message Queuing Protocol (AMQP).
• ActiveMQ is written in Java and supports multiple messaging protocols like OpenWire, STOMP, MQTT, and AMQP.

• RabbitMQ is written in Erlang and specifically implements the AMQP protocol.

• ActiveMQ is more feature-rich and has a larger user base, while RabbitMQ is known for its reliability a...read more
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Q6. What are databases are present in Azure DB
Ans. 
Azure DB offers various databases including SQL Database, Cosmos DB, MySQL, PostgreSQL, and MariaDB.
• SQL Database

• Cosmos DB

• MySQL

• PostgreSQL

• MariaDB
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Q7. Diff between HashSet and HashMap

Ans. 

HashSet is a collection of unique elements, while HashMap is a key-value pair collection.

• HashSet does not allow duplicate elements, HashMap allows duplicate keys but not duplicate values.

• HashSet uses Set interface, HashMap uses Map interface.

• Example: HashSet set = new HashSet<>(); HashMap map = new HashMap<>();

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