100+ QaaS Labs Interview Questions and Answers

Web API is a set of protocols and tools for building software applications that communicate with each other through the internet.

• Web API allows different software applications to communicate with each other over the internet.

• It uses a set of protocols and tools to enable this communication.

• Web API is commonly used in web development to allow web applications to interact with each other.

• Examples of Web APIs include Google Maps API, Twitter API, and Facebook API.

Skip first and last 10 rows in Excel source and send to destination

• Use a library like Apache POI or OpenXML to read and write Excel files

• Identify the range of rows to be skipped using row numbers or cell values

• Copy the remaining rows to a new Excel file or sheet and save it as destination

Hashmap is a data structure in Java that stores key-value pairs. It provides fast retrieval and insertion of elements.

• Hashmap uses hashing to store and retrieve elements based on keys

• It allows null values and only one null key

• Lists are ordered collections while Hashmap is not

• Lists allow duplicate elements while Hashmap does not

Diamond structure problem occurs when a class inherits from two classes that have a common base class.

• Diamond structure problem is a common issue in multiple inheritance where a class inherits from two classes that have a common base class.

• This can lead to ambiguity in the inheritance hierarchy and can cause issues with method overriding and variable access.

• One way to resolve the diamond structure problem is by using virtual inheritance, where the common base class is inherit...read more

Programs to count frequency of characters in a string, check if a number is power of 3, and SQL query to get highest salary employees by country.

• For frequencyOfChars, use a HashMap to store character counts and iterate through the string.

• For isPowerOf3, keep dividing the number by 3 until it becomes 1 or not divisible by 3.

• For SQL query, use a subquery to get max salary for each country and join with Emp table.

• Example SQL query: SELECT e1.* FROM Emp e1 JOIN (SELECT Country, M...read more

The code segment that starts jquery execution is $(document).ready(function(){...});

• $() is a shorthand for jQuery() function

• document refers to the HTML document object

• ready() method waits for the document to be fully loaded

• function(){} is the code block that executes when the document is ready

Interface defines only method signatures while abstract class can have both method signatures and implementations.

• An interface can be implemented by multiple classes while an abstract class can only be extended by one class.

• An abstract class can have constructors while an interface cannot.

• An abstract class can have non-abstract methods while an interface can only have abstract methods.

• An abstract class can have instance variables while an interface cannot.

• Example of interface...read more

SpringBoot is a framework that simplifies the development of Java applications by providing a lightweight, opinionated approach.

• SpringBoot eliminates the need for boilerplate code and configuration, allowing developers to focus on writing business logic.

• It provides a wide range of built-in features and libraries, such as embedded servers, dependency management, and auto-configuration.

• SpringBoot promotes modular and scalable application development through its support for micr...read more

Errors in MVC can be handled using try-catch blocks, custom error pages, and logging.

• Use try-catch blocks to catch exceptions and handle them appropriately

• Create custom error pages to display user-friendly error messages

• Implement logging to track errors and debug issues

• Use ModelState.IsValid to validate user input and prevent errors

• Use global error handling filters to handle errors across the application

Security settings in IIS are configurations that help protect web applications from unauthorized access and attacks.

• IIS Manager allows for configuring security settings for websites and applications

• Authentication settings can be configured to control access to resources

• IP and domain restrictions can be set to allow or deny access to specific clients

• SSL/TLS settings can be configured to encrypt traffic between clients and servers

• Request filtering can be used to block requests ...read more

Application pool is a container for applications hosted on IIS.

• It provides a separate process and memory space for each application.

• It helps in isolating applications from each other.

• It allows for better resource management and application availability.

• It can be configured with different settings like .NET framework version, identity, etc.

Abstract class can have implementation while interface only has method signatures.

• Abstract class can have constructors while interface cannot.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract class can have non-public members while interface only has public members.

• Abstract class is used for creating a base class while interface is used for implementing a contract.

• Example of abstract class: Animal (with abstract method 'makeSound'...read more

Server side validation is the process of validating user input on the server before processing it.

• It ensures that the data received from the client is valid and secure.

• It prevents malicious attacks and data breaches.

• It reduces the load on the client-side and improves performance.

• Examples include checking for required fields, data type, length, and format.

• It is an essential part of web application security.

Advanced Java is used to develop complex and high-performance applications that require advanced features and functionalities.

• Advanced Java provides advanced features like multithreading, networking, and database connectivity.

• It allows for the development of robust and scalable enterprise applications.

• Advanced Java frameworks like Spring and Hibernate simplify application development.

• It enables the creation of secure and efficient web applications.

• Advanced Java is widely used...read more

SQL keys and use of surrogate key

• SQL keys are used to uniquely identify records in a table

• Primary key is a unique identifier for a record

• Foreign key is a reference to a primary key in another table

• Surrogate key is a system-generated unique identifier for a record

• Surrogate keys are useful when there is no natural primary key

I am fascinated by the problem-solving aspect of coding and the ability to create something from scratch.

• Enjoy the challenge of solving complex problems

• Love the creativity involved in building something new

• Appreciate the logical thinking required in coding

• Passionate about technology and innovation

I have used Angular version 8 and 9 in my previous projects.

• Used Angular 8 for a project that required advanced routing and lazy loading features

• Upgraded to Angular 9 to take advantage of improved performance and Ivy rendering engine

Cybage is a global technology consulting organization specializing in outsourced product engineering services.

• Founded in 1995 and headquartered in Pune, India

• Provides software development, testing, and maintenance services

• Has a presence in North America, Europe, and Asia-Pacific regions

• Serves industries such as healthcare, retail, banking, and finance

• Has partnerships with companies like Microsoft, IBM, and Amazon Web Services

Action filters are attributes that can be applied to controller actions to modify the way they behave.

• Action filters are used to perform tasks before or after an action method executes.

• They can be used to modify the result of an action method.

• Examples include authentication filters, caching filters, and exception filters.

Media type formatters are used to serialize and deserialize data in Web API.

• Media type formatters are responsible for converting data between CLR objects and their serialized representation.

• They are used in Web API to format the response data based on the client's request.

• Examples of media type formatters include JSON, XML, and BSON.

• Developers can create custom media type formatters to support other data formats.

React is a JavaScript library for building user interfaces. CSS is a styling language used to design web pages. Redux is a predictable state container for JavaScript apps.

• React is used for building reusable UI components

• CSS is used to style and layout web pages

• Redux is used for managing the state of an application

• React and Redux are often used together to build complex web applications

Attribute handling refers to the management and manipulation of attributes in software development.

• Attributes are characteristics or properties of an object or entity.

• Attribute handling involves defining, accessing, modifying, and deleting attributes.

• Attributes can be used to store data, control behavior, or provide metadata.

• Examples of attribute handling include setting the color of a button, retrieving the size of a file, or changing the font of a text.

• Attribute handling is...read more

Serialization is the process of converting an object into a format that can be stored or transmitted.

• Serialization is used to save the state of an object and recreate it later.

• It is commonly used in network communication to transmit data between different systems.

• Examples of serialization formats include JSON, XML, and binary formats like Protocol Buffers.

• Serialization can also be used for caching and data persistence.

Selector method is used to select and manipulate elements in a web page using CSS selectors.

• Selector method is a part of CSS (Cascading Style Sheets).

• It is used to select and manipulate HTML elements based on their attributes, classes, and IDs.

• Examples of selector methods include getElementById(), getElementsByClassName(), and querySelectorAll().

SSIS checkpoint and breakpoint are used for debugging and error handling in SSIS packages.

• Checkpoint saves the package progress and restarts from the last successful checkpoint in case of failure.

• Breakpoint pauses the package execution at a specific point to allow debugging and troubleshooting.

• Both can be set at the package level or individual task level.

• Checkpoint uses a checkpoint file to store the progress information.

• Breakpoint can be set by right-clicking on a task and s...read more

Cybage is a global technology consulting organization specializing in outsourced product engineering services.

• Cybage is a global technology consulting organization

• Specializes in outsourced product engineering services

• Offers services in software development, testing, and maintenance

• Has expertise in various domains including healthcare, finance, and retail

• Has a strong focus on quality and customer satisfaction

Delegate is a type that represents references to methods with a specific parameter list and return type.

• Delegates are similar to function pointers in C++.

• They are used to achieve loose coupling and separation of concerns.

• There are two types of delegates: singlecast and multicast.

• Singlecast delegates can hold references to a single method.

• Multicast delegates can hold references to multiple methods.

• Delegates are commonly used in event handling and callback scenarios.

CORS (Cross-Origin Resource Sharing) is a security feature that allows or restricts access to resources from different domains.

• CORS is used to prevent unauthorized access to resources from different domains

• It is implemented by adding specific headers to HTTP responses

• CORS can be configured to allow or restrict access based on the origin domain

• Examples of CORS headers include Access-Control-Allow-Origin and Access-Control-Allow-Methods

LINQ (Language Integrated Query) is a feature in C# that allows for querying data from different data sources using a uniform syntax.

• LINQ allows for querying data from collections, databases, XML, and more.

• It provides a set of standard query operators like Where, Select, OrderBy, etc.

• LINQ queries are written in a declarative syntax similar to SQL.

• Example: var result = from num in numbers where num % 2 == 0 select num;

Different types of joins in SQL include inner join, left join, right join, and full outer join.

• Inner join: Returns rows when there is a match in both tables

• Left join: Returns all rows from the left table and the matched rows from the right table

• Right join: Returns all rows from the right table and the matched rows from the left table

• Full outer join: Returns rows when there is a match in either table

REST stands for Representational State Transfer, a software architectural style for designing networked applications.

• REST is based on the idea of treating server objects as resources that can be created, updated, and deleted using standard HTTP methods.

• It uses a stateless communication protocol, meaning each request from a client to a server must contain all the information necessary to understand the request.

• RESTful APIs typically use endpoints to represent resources, with e...read more

Custom middleware in .NET Core is a piece of code that sits between the request and response pipeline to perform custom operations.

• Custom middleware can be used to add custom headers, logging, authentication, and authorization to the request pipeline.

• Middleware can be added to the pipeline using the Use() method in the Startup.cs file.

• Middleware can be created using classes that implement the IMiddleware interface or by using lambda expressions.

• Middleware can be ordered in th...read more

OOPS Concepts are fundamental principles of Object-Oriented Programming, including Inheritance, Encapsulation, Polymorphism, and Abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.

Spring is a framework for building Java applications, while Spring Boot is a tool for quickly creating Spring-based applications.

• Spring provides a comprehensive framework for building Java applications, while Spring Boot is a tool that simplifies the process of creating Spring-based applications.

• Spring requires more configuration and setup, while Spring Boot provides a more streamlined approach.

• Spring Boot includes an embedded server, making it easier to deploy and run applic...read more

Temp table is stored in tempdb and table variable is stored in memory.

• Temp table is created using CREATE TABLE statement and can be accessed by multiple sessions.

• Table variable is created using DECLARE statement and can only be accessed within the scope of the batch or procedure.

• Temp table can have indexes and statistics while table variable cannot.

• Temp table is useful for large data sets while table variable is useful for small data sets.

• Temp table can be used in transaction...read more

Discussing the impact of artificial intelligence on society

• Introduction to artificial intelligence and its applications

• Positive impacts of AI on society such as improved healthcare and efficiency

• Negative impacts of AI like job displacement and privacy concerns

• Ethical considerations in AI development and usage

• Future implications of AI on society

React dataflow is unidirectional, from parent to child components via props and from child to parent via callbacks.

• React follows a unidirectional data flow architecture.

• Parent components pass data down to child components via props.

• Child components can update the parent's state via callbacks.

• This helps to maintain a clear and predictable flow of data throughout the application.

• Redux can be used to manage more complex data flows.

To recover data from a virus-infected HDD, isolate the HDD, scan it with antivirus software, and use data recovery tools if necessary.

• Disconnect the infected HDD from the computer to prevent further spread of the virus

• Connect the HDD to a clean and secure computer as a secondary drive

• Run a thorough antivirus scan on the infected HDD to remove the virus

• If the antivirus scan doesn't recover the data, use data recovery software like Recuva, TestDisk, or EaseUS Data Recovery Wiza...read more

OOPs concept focuses on objects and classes, while MVC architecture separates the application into Model, View, and Controller components.

• OOPs concept involves encapsulation, inheritance, polymorphism, and abstraction.

• MVC architecture separates the application logic into Model (data), View (presentation), and Controller (interaction) components.

• Example of OOPs concept: Creating a class 'Car' with properties like 'color' and methods like 'drive'.

• Example of MVC architecture: A ...read more

Answering questions related to QA Automation Engineer interview

• To handle username and password popup, use sendKeys() method to enter the credentials

• To handle frames, use switchTo().frame() method

• To switch to another tab, use switchTo().window() method

• Relative xpath starts with '//' and searches for elements based on their relationship with other elements

• Absolute xpath starts with '/' and searches for elements based on their exact location in the HTML tree

• TestNG is a testing f...read more

Types of join in SQL

• Inner join: returns only the matching rows from both tables

• Left join: returns all rows from the left table and matching rows from the right table

• Right join: returns all rows from the right table and matching rows from the left table

• Full outer join: returns all rows from both tables

• Cross join: returns the Cartesian product of both tables

An interface is a contract that defines a set of methods that a class must implement.

• An interface provides a way to achieve multiple inheritance in Java.

• Interfaces are used to achieve abstraction and loose coupling.

• Classes can implement multiple interfaces.

• Interfaces can have default methods and static methods.

• Example: The Comparable interface in Java is used to compare objects.

Data can be submitted in PowerApps through various ways.

• Using SubmitForm function

• Using Patch function

• Using Update function

• Using Collect function

• Using a custom connector

• Using a data gateway

• Using a flow

• Using a REST API

OOPs concepts are fundamental principles in object-oriented programming that help in organizing and designing code.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: The ability of objects to take on multiple forms or have multiple behaviors.

• Abstraction: Hiding complex implementation details and showing only the necessary features of an o...read more

Reverse an array of strings in place

• Iterate through half of the array and swap elements at opposite ends

• Use a temporary variable to store the value being swapped

Spring Boot is a framework that simplifies the development of Java applications by providing a set of tools and conventions.

• Spring Boot eliminates the need for complex configuration by providing defaults for most settings.

• Actuator is a set of tools provided by Spring Boot for monitoring and managing the application.

• Query param is used to pass parameters in the URL of an HTTP request.

• HTTP methods like GET, POST, PUT, DELETE are used to perform different operations on resources...read more

Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types.

• Examples include method overloading and method overriding in object-oriented programming.

Wrapper classes are used to convert primitive data types into objects.

• Wrapper classes provide methods to convert primitive data types into objects and vice versa

• Wrapper classes are immutable

• Wrapper classes are used in collections and generics

• Examples of wrapper classes include Integer, Double, Boolean, etc.

Abstract classes are partially implemented classes while interfaces are fully abstract classes.

• Abstract classes can have both implemented and abstract methods while interfaces can only have abstract methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes can have constructors while interfaces cannot.

• Interfaces are used for achieving multiple inheritance in Java.

• Abstract classes are used for creating a base class for othe...read more

Collection framework in Java provides a set of interfaces and classes to store and manipulate groups of objects.

• Provides interfaces like List, Set, and Map for different types of collections

• Classes like ArrayList, HashSet, and HashMap implement these interfaces

• Allows easy manipulation and iteration over collections

• Provides algorithms like sorting and searching for collections

• Introduced in Java 1.2

Cybage is a global technology consulting organization specializing in outsourced product engineering services.

• Cybage has a strong focus on software engineering and product development.

• They have a global presence with offices in North America, Europe, and Asia.

• Cybage has expertise in various industries including healthcare, retail, and finance.

• They have won several awards for their work in software engineering and innovation.

React is better than Angular due to its flexibility, performance, and community support.

• React allows for more flexibility in terms of architecture and state management compared to Angular.

• React's virtual DOM leads to better performance by only updating the necessary components, while Angular's two-way data binding can cause performance issues.

• React has a larger and more active community, providing better support and a wider range of resources compared to Angular.

Content Query Web Part is a Sharepoint Online tool that displays content from multiple sites in a single location.

• Displays content from multiple sites in a single location

• Can be customized to show specific content based on filters

• Can be used to create dynamic navigation menus

• Can be used to display news or announcements from across the organization

Containers in SSIS are used to group related tasks and provide a logical flow for the package.

• Containers can be used to group tasks into a single unit of work

• There are several types of containers in SSIS, including Sequence, For Loop, and Foreach Loop

• Containers can be nested to create complex workflows

• Containers can have precedence constraints to control the order in which tasks are executed

Delegation allows users to assign tasks to others. Gallery controls are used to display images and videos.

• Delegation is a feature that allows users to assign tasks to others, giving them the ability to complete the task on behalf of the original user.

• Gallery controls are used to display images and videos in a visually appealing way, allowing users to easily browse and view content.

• Examples of gallery controls include the Picture Library Slideshow Web Part and the Media Web Pa...read more

Strings in Java are sequences of characters used to store and manipulate text data.

• Strings in Java are immutable, meaning their values cannot be changed once they are created.

• String objects can be created using the 'new' keyword or by directly assigning a string literal.

• Common string operations in Java include concatenation, substring extraction, and comparison.

Pipes in Angular are used for transforming data in templates.

• Pipes are used to format data before displaying it in the view.

• Angular provides built-in pipes like date, currency, uppercase, lowercase, etc.

• Custom pipes can also be created for specific formatting needs.

• Pipes can be chained together for multiple transformations.

• Example: {{ birthday | date:'MM/dd/yyyy' }} will format the birthday date.