NICE Interview Questions, Process, and Tips

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

Q1. OOP-Polymorphism
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Q2. DSA-Mirror image of binary tree
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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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Q1. 1-Java Questions- this, super keyword, Difference between Abstract class and interfece
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Q2. 2-Asked OOPs concepts, asked questions on method overloading and overrding
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Q3. 3-Java program to reverse string, check palindrome
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Java program to reverse string and check if it is a palindrome.
• Create a function to reverse the input string.

• Compare the reversed string with the original string to check if it is a palindrome.

• Use built-in functions like StringBuilder or StringBuffer for string manipulation.

• Handle cases where input is null or empty.
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Q4. 4- Selenium questions- list vs set, findelement vs findelements, Actions class, write syntax for actions class, implict wait and explict wait
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Selenium questions covering list vs set, findelement vs findelements, Actions class, implicit wait, and explicit wait.
• List vs Set: List allows duplicate elements and maintains insertion order, while Set does not allow duplicates.

• findElement vs findElements: findElement returns the first matching element, findElements returns a list of all matching elements.

• Actions class: Used for performing complex user interactions li...read more
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Q5. 5- Questions on mostly used git commands, what is CICD
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Q6. 6-API testing various response codes
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API testing involves checking various response codes to ensure the API functions correctly.
• Test for common response codes like 200 (OK), 400 (Bad Request), 401 (Unauthorized), 404 (Not Found), 500 (Internal Server Error)

• Verify the response code matches the expected result based on the API request

• Use tools like Postman or RestAssured to automate API testing and check response codes

• Check for edge cases where the API may
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Q7. 7- Manual testing questions- what is regression testing, difference between regression and restesting Difference between intergration and system testing
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Q8. 8- agile process, what is user story, what is sprint
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User story is a description of a feature from an end-user perspective, and sprint is a time-boxed iteration in Agile development.
• User story is a short, simple description of a feature told from the perspective of the person who desires the new capability.

• Sprint is a time-boxed iteration in Agile development, usually lasting 1-4 weeks, where a team works on a set of user stories.

• User stories are written in a specific fo...read more
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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
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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
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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
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