TCS Interview Questions, Process, and Tips

Q1. Difference between display none, visibility hidden and opacity 0 in CSS
Ans. 
display none hides the element completely, visibility hidden hides the element but still takes up space, opacity 0 makes the element transparent.
• display none removes the element from the layout

• visibility hidden hides the element but it still occupies space

• opacity 0 makes the element transparent but still occupies space

• Example: display: none; visibility: hidden; opacity: 0;
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Q2. Write a polyfill for javascript method "filter"
Ans. 
Polyfill for JavaScript method 'filter'
• Create a function called 'filter' that takes a callback function as an argument

• Loop through the array and apply the callback function to each element

• If the callback function returns true, add the element to a new array and return it
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Q3. Explain ShadowDOM
Ans. 
Shadow DOM is a way to encapsulate the styling and structure of a web component, preventing styles from leaking out and clashing with the rest of the page.
• Shadow DOM allows for creating self-contained components with their own DOM tree and styling.

• It helps in preventing styles from the main document affecting the component and vice versa.

• Shadow DOM can be created using the 'attachShadow' method in JavaScript.

• It is comm...read more
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Q4. Explain Currying in Javascript
Ans. 
Currying is a technique in JavaScript where a function with multiple arguments is transformed into a sequence of functions, each taking a single argument.
• Currying allows you to create reusable functions with partial application of arguments.

• It helps in creating more flexible and composable functions.

• Example: const add = (a) => (b) => a + b; const add5 = add(5); console.log(add5(3)); // Output: 8
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Q5. What is Event Deligation in javascript
Ans. 
Event delegation in JavaScript is a technique where a single event listener is attached to a parent element to handle events for multiple child elements.
• Event delegation helps improve performance by reducing the number of event listeners.

• It is useful for dynamically created elements or elements with similar behavior.

• Event delegation works by utilizing event bubbling, where events on child elements bubble up to the pare
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Q1. What areas have you worked on in Pega?
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Q2. Flows, case management, Integration, activity, data transforms
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Q1. What role do you expect to assume in this position?
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Q1. Write a Spring boot application to accept two values and generate an XML file.
Ans. 
Create a Spring Boot application to generate an XML file from two input values.
• Create a Spring Boot project using Spring Initializr

• Create a REST controller to accept two input values

• Use JAXB to generate XML from the input values

• Return the generated XML file as response
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Q2. Write a program to insert comma after every character.
Ans. 
Program to insert comma after every character in a string.
• Iterate through each character in the string

• Append the character and a comma to a new string

• Handle the last character to avoid adding an extra comma
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Q3. Find the third max Salary in Oracle.
Ans. 
Use SQL query with ROW_NUMBER() function to find the third max salary in Oracle.
• Use ROW_NUMBER() function to assign a unique row number to each row based on the salary in descending order.

• Filter the result where the row number is 3 to get the third max salary.
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Q4. Microservies design pattern. Explain annotation used in circuit breaker.
Ans. 
Circuit breaker is a design pattern used in microservices to prevent cascading failures.
• Circuit breaker is used to detect failures and prevent them from causing further issues.

• It works by wrapping a protected function call in a circuit breaker object.

• Annotations like @CircuitBreaker in Spring Cloud are used to implement circuit breaker pattern.

• These annotations allow developers to easily add circuit breaker functionali
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Q5. JPA vs Hibernate
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JPA is a specification while Hibernate is an implementation of JPA.
• JPA is a Java specification for managing relational data in applications.

• Hibernate is an ORM framework that implements the JPA specification.

• Hibernate provides additional features beyond JPA, such as caching and lazy loading.

• JPA is vendor-neutral, allowing developers to switch between different JPA implementations.

• Hibernate is a popular choice for JPA i...read more
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Q1. Desktop support
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Q2. Service desk
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Q1. Windows server dns DHCP 2012/2019
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Q2. Active directory
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Q3. Desktop os and deployment
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Aptitude covers verbal, quantitative and logical

Q1. What is Encryption?
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Q2. What is Decryption?
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Q3. Why data security?
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Q4. Difference between http and https
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Q5. Types of databases
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Q6. What is cloud and why cloud
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Q7. What is cucumber framework
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Q8. What is regression testing
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Q1. Write code to launch a browser?
Ans. 
Code to launch a browser in Java
• Use Selenium WebDriver to launch a browser

• Create a WebDriver object and specify the browser to launch (e.g. Chrome, Firefox)

• Use the get() method to open a specific URL in the browser
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Q2. Why we use WeDriver interface while creating a browser driver instance?
Ans. 
WebDriver interface provides a common set of methods to interact with different browsers, allowing for easy switching between browser drivers.
• WebDriver interface acts as a common API for interacting with different browsers

• It allows for easy switching between different browser drivers without changing the code

• WebDriver interface provides a set of methods for browser manipulation and navigation

• Using WebDriver interface p
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Q3. Why wrapper classes of Primitive datatypes are introduced in java?
Ans. 
Wrapper classes are introduced in Java to provide a way to convert primitive data types into objects.
• Wrapper classes allow primitive data types to be used in collections like ArrayList, where only objects can be stored.

• Wrapper classes provide utility methods to work with primitive data types, like converting them to strings or performing mathematical operations.

• Wrapper classes also allow null values to be assigned to p...read more
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Q4. Difference between Explicit wait and Fluent wait?
Ans. 
Explicit wait is used to wait for a specific condition to be met, while Fluent wait is used to wait for a condition with a polling frequency and timeout.
• Explicit wait is used with a specific condition and a timeout period.

• Fluent wait allows defining a custom polling frequency and ignoring specific exceptions.

• Example: Explicit wait - WebDriverWait wait = new WebDriverWait(driver, 10); wait.until(ExpectedConditions.visib...read more
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