Cognizant Interview Questions, Process, and Tips

Aptitude test includes number series, profit and loss, percentage, train problems

Q1. About SQL queries and database
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Q2. About object oriented programming, pointers, arrays, linked list
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Q1. Java Basics -- method overloading and overriding, diff b/w interface and abstract class, Abstraction in oops concept, star program, prime no. Or not program
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Q2. Selenium BDD framework structure
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Q3. How to convert JSON file into Java object
Ans. 
Use libraries like Jackson or Gson to convert JSON file into Java object
• Use libraries like Jackson or Gson for easy conversion

• Create a POJO class that represents the structure of JSON data

• Use ObjectMapper class in Jackson or Gson.fromJson() method to convert JSON file into Java object
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Q4. Different annotations use in Junit hooks
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Different annotations used in JUnit hooks
• Annotations like @Before, @After, @BeforeClass, @AfterClass are used in JUnit hooks

• These annotations help in setting up and tearing down test fixtures before and after test methods

• Example: @Before public void setUp() { // setup code }
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Q5. One scenario based on hooks
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Q6. Background keyword in BDD
Ans. 
Background keyword in BDD is used to define preconditions for a scenario
• Background keyword is used to define steps that are common to all scenarios in a feature file

• It helps in reducing duplication of steps in scenarios

• Background keyword is placed before the first scenario in a feature file
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Q7. Different types of exceptions while executing test cases
Ans. 
Different types of exceptions encountered while executing test cases
• 1. Checked exceptions: Must be caught or declared in the method signature

• 2. Unchecked exceptions: Not required to be caught or declared

• 3. Runtime exceptions: Occur during runtime due to logical errors

• 4. Assertion errors: Failures in assertions made in the test cases

• 5. Timeout exceptions: Test case takes longer than expected to complete
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Q8. Syntax of Drag and Drop
Ans. 
Drag and Drop is a common interaction in web applications where a user can click and drag an element to a new location.
• Drag and Drop is implemented using HTML5's Drag and Drop API.

• The syntax involves setting the draggable attribute to true on the element you want to drag.

• You also need to define event handlers for dragstart, dragover, and drop events.

• Example:

  Drag me!
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Q9. Syntax for Pinch and zoom
Ans. 
Pinch and zoom syntax is used to zoom in and out on touch screen devices.
• Use two fingers to pinch inwards to zoom out

• Use two fingers to pinch outwards to zoom in

• For zooming, use the 'transform' property in CSS
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Q1. Question given on some cases that I solved over the phone call.
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Online Hackathon test was taken.

Q1. Tell Me About Yourself.
Ans. 
I am a passionate React Js Frontend Developer with experience in building user-friendly and responsive web applications.
• Experienced in developing web applications using React Js

• Proficient in HTML, CSS, and JavaScript

• Familiar with state management libraries like Redux

• Strong understanding of responsive design principles

• Ability to work collaboratively in a team environment
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Q2. Tell me about your roles and responsibilities in your current project.
Ans. 
I am responsible for developing and maintaining the frontend of the project using React Js.
• Developing user-friendly interfaces using React Js

• Implementing responsive design and ensuring cross-browser compatibility

• Collaborating with backend developers to integrate frontend with backend services

• Optimizing application performance and troubleshooting issues

• Participating in code reviews and providing feedback to team members
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Q3. How we implement SSR in React.
Ans. 
SSR in React is implemented using server-side rendering to pre-render React components on the server before sending them to the client.
• Use libraries like Next.js or Gatsby to implement SSR in React.

• Configure server to render React components on the server side.

• Optimize server-side rendering for performance by caching rendered components.
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Q4. How can we change our project in production mode from development mode.
Ans. 
To change a React project from development mode to production mode, you need to build the project using the 'npm run build' command.
• Run 'npm run build' command in the terminal to create a production build of the project.

• This command will generate a 'build' folder with optimized and minified files for production.

• You can then deploy the contents of the 'build' folder to a web server for production use.
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Q5. What is lazy loading and how we can implement in our project.

Ans. 

Lazy loading is a technique used to defer loading non-essential resources until they are needed.

• Lazy loading helps improve performance by only loading resources when they are required.

• In React, lazy loading can be implemented using React.lazy() and Suspense components.

• Example: const MyComponent = React.lazy(() => import('./MyComponent'));

• Example: Loading...

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