1000+ QA Engineer Interview Questions and Answers

Selenium code to login and add to cart on yatra.com

• Launch the yatra.com website

• Enter login credentials and click on login button

• Search for desired product and add to cart

• Verify the product is added to cart

Quality Assurance focuses on preventing defects, while Quality Control focuses on identifying and fixing defects.

• Quality Assurance is a proactive process that involves establishing and maintaining standards, processes, and procedures to prevent defects.

• Quality Control is a reactive process that involves inspecting and testing products or services to identify and fix defects.

• Quality Assurance is focused on the entire software development lifecycle, ensuring that quality is bui...read more

Entering valid username and password and successfully logging in

• Enter a valid username and password

• Click on the login button

• Verify that the user is successfully logged in

The least count of a vernier caliper is the smallest measurement that can be read on the scale.

• The least count is determined by the number of divisions on the main scale and the vernier scale.

• It is calculated by dividing the smallest division on the main scale by the number of divisions on the vernier scale.

• For example, if the smallest division on the main scale is 0.1 mm and the vernier scale has 10 divisions, the least count would be 0.01 mm.

Identifying problems and non-conformities in manufacturing processes during plant visit.

• Observe the production line for any bottlenecks or delays

• Check if the workers are following safety protocols

• Inspect the quality of raw materials used in production

• Review the documentation and records of the manufacturing process

• Identify any deviations from the standard operating procedures

• Look for any equipment or machinery that needs maintenance or repair

• Check if the finished products mee...read more

As a QA Engineer, I have experience handling various measuring instruments such as calipers, micrometers, gauges, and rulers.

• Calipers

• Micrometers

• Gauges

• Rulers

E2E tests in automation are written to simulate real user scenarios from start to finish.

• Identify end-to-end scenarios to test

• Use automation tools like Selenium or Cypress

• Write test scripts to simulate user actions

• Verify expected outcomes and results

• Run tests regularly to ensure functionality

Python star pattern 1 12 123 is a pattern printing question. List and Dictionary are data structures in Python.

• Python star pattern 1 12 123 can be achieved using nested loops.

• Lists are ordered collections of items, accessed by index. Dictionaries are key-value pairs, accessed by key.

• Example: List - [1, 2, 3], Dictionary - {'a': 1, 'b': 2, 'c': 3}

driver.close() closes the current window while driver.quit() closes all windows and ends the session.

• driver.close() only closes the current window while driver.quit() closes all windows and ends the session

• driver.close() can be used when multiple windows are open and you want to close only one of them

• driver.quit() should be used at the end of the script to ensure all windows are closed and the session is ended

SQL commands are used to interact with databases, writing test cases involves creating scenarios to test product functionality, types of testing include unit, integration, regression, etc.

• SQL commands like SELECT, INSERT, UPDATE, DELETE are used to retrieve, add, modify, and delete data in databases

• Writing test cases involves creating scenarios to test different aspects of the product such as functionality, performance, security, etc.

• Types of testing include unit testing to t...read more

BBT stands for Behavior-Based Testing, a software testing technique that focuses on the behavior of the system under test.

• BBT involves creating test cases based on the expected behavior of the system

• It is a black-box testing technique that does not require knowledge of the internal workings of the system

• BBT can be used to test both functional and non-functional requirements

• Examples of BBT tools include Selenium, Cucumber, and FitNesse

I am currently working with Selenium WebDriver, JIRA, and Jenkins.

• Selenium WebDriver for automated testing

• JIRA for bug tracking and project management

• Jenkins for continuous integration and deployment

The interview questions cover topics like palindrome checking, inheritance, STLC, Agile Testing, testing approaches, white box vs black box testing, and SDLC models.

• Palindrome checking involves determining if a string reads the same forwards and backwards.

• Inheritance in programming allows a class to inherit properties and methods from another class.

• STLC (Software Testing Life Cycle) is a series of steps followed to ensure high-quality software.

• Agile Testing is a software test...read more

API stands for Application Programming Interface. It is a set of protocols and tools for building software applications.

• API allows different software applications to communicate with each other

• APIs can be used to retrieve data from a remote server

• APIs can be used to send data to a remote server

• APIs can be used to perform actions on a remote server

• HTTP status codes are used to indicate the status of a request

• 400 status code indicates a bad request

• 400 status code is returned wh...read more

TDD focuses on testing the functionality of individual units of code, while BDD focuses on testing the behavior of the system as a whole.

• TDD stands for Test-Driven Development, where tests are written before the code is implemented to drive the development process.

• BDD stands for Behavior-Driven Development, where tests are written in a human-readable format to describe the behavior of the system.

• TDD is more focused on the technical aspects of the code, ensuring that individua...read more

An interface is a contract between two entities defining the communication between them. In Selenium, interfaces are used to define the behavior of web elements.

• An interface defines a set of methods that a class implementing it must implement

• In Selenium, the WebElement interface is used to interact with web elements on a page

• Other interfaces in Selenium include WebDriver, TakesScreenshot, and JavascriptExecutor

• Interfaces allow for abstraction and modularity in code

Launch 100 windows and select a particular window from opened tabs

• Use a loop to launch 100 windows

• Keep track of each window's handle or identifier

• Use the handle or identifier to select the desired window

Code to sort array elements without duplicates

• Use a Set to store unique elements while iterating through the array

• Convert the Set back to an array for the final result

• Use Array.sort() method to sort the elements in the array

Questions related to quality, MSA, experience, gauges least count, and drawing knowledge for QA Engineer position.

• Quality refers to the degree of excellence of a product or service.

• MSA stands for Measurement System Analysis, which is a statistical method used to determine the accuracy and precision of a measurement system.

• Years of experience in QA field is important for this position.

• Least count is the smallest value that can be measured by a gauge.

• Knowledge about drawing is ...read more

The candidate is asked to write XPath and CSS selectors for elements on a webpage.

• XPath is a language used to navigate XML documents and can be used to locate elements on a webpage.

• CSS selectors are patterns used to select elements on a webpage based on their attributes.

• XPath selectors start with a forward slash (/) and can traverse the DOM hierarchy.

• CSS selectors can select elements based on their tag name, class, ID, or other attributes.

• Examples of XPath selector: /html/bod...read more

Program to store characters of a string in an arraylist and print it.

• Create an ArrayList to store characters

• Iterate through the string and add each character to the ArrayList

• Print the ArrayList

Priority and severity are terms used in software testing to indicate the importance and impact of a defect.

• Priority refers to the level of urgency in fixing a defect, based on its impact on the system and business goals.

• Severity refers to the degree of impact a defect has on the system's functionality and user experience.

• Priority and severity are often assigned numerical values or labels, such as high, medium, or low.

• Examples of high priority and severity defects include crit...read more

The number of bugs in a module can vary due to various factors.

• The complexity of the module can affect the number of bugs.

• The experience and skill level of the developer can also play a role.

• The testing process can catch and eliminate bugs before release.

• The use of automated testing tools can help identify and fix bugs.

• The quality of the code review process can also impact the number of bugs.

• The use of best practices and coding standards can reduce the likelihood of bugs.

Object Oriented Programming is a programming paradigm that uses objects to represent real-world entities and their interactions.

• Encapsulation: bundling of data and methods that operate on that data within a single unit

• Inheritance: ability of a class to inherit properties and methods from a parent class

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

• Abstraction: hiding of complex implementation details and providing a simplified interface for t...read more

Access specifiers define the level of access to classes, methods, and variables in object-oriented programming.

• Access specifiers include public, private, protected, and default.

• Public access specifier allows access from any other class.

• Private access specifier restricts access to only within the same class.

• Protected access specifier allows access within the same package and subclasses.

• Default access specifier (no keyword) restricts access to only within the same package.

Smoke testing is a quick test to check if the software build is stable, while sanity testing is a more thorough test to check specific functionalities.

• Smoke testing is done to ensure the critical functionalities of the software are working fine after a build, while sanity testing is done to verify specific features or functionalities.

• Smoke testing is usually performed before detailed testing, while sanity testing is performed after regression testing.

• Smoke testing is a subset...read more

SDLC is Software Development Life Cycle, STLC is Software Testing Life Cycle, priority and severity are used to prioritize bugs, Agile methodology is a software development approach, Jira is a project management tool.

• SDLC (Software Development Life Cycle) is a process used by software development teams to design, develop, and test high-quality software.

• STLC (Software Testing Life Cycle) is a process used by testing teams to plan, design, execute, and report on tests.

• Priority ...read more

Regression testing is retesting of previously tested software to ensure that changes made to the software have not affected its existing functionality.

• Regression testing is done to ensure that changes made to the software have not introduced new bugs or affected its existing functionality.

• It is usually done after a new feature or bug fix is implemented.

• Examples include running a test suite after a code change or after a new release of the software.

• Integration testing is testi...read more

Test case with valid credentials and expected successful login is most appropriate for testing a login system.

• Test with valid credentials

• Test with invalid credentials

• Test with blank credentials

• Test with special characters in credentials

Answers to common QA Engineer interview questions

• Sanity testing is a quick check to ensure that the major functionalities of the software are working as expected

• Regression testing is retesting of the software after changes have been made to ensure that the existing functionalities are not affected

• Scenario-based questions are used to test the software in different scenarios to ensure that it works as expected in all situations

• Defect bug life cycle includes identification, logg...read more

No, in Java you cannot overload/override functions based on return types.

• In Java, method overloading is based on the number and type of parameters, not the return type.

• Method overriding is based on the method signature, which includes the method name, parameter types, and order, but not the return type.

• Attempting to overload or override a method based solely on return type will result in a compilation error.

Use recursion to print numbers from 1 to 1000 without using loops

• Create a recursive function that takes a number as input

• Print the number and call the function with the next number until 1000 is reached

To validate the button color, inspect the CSS properties or use a color picker tool.

• Inspect the CSS properties of the button element to check the color value

• Use a color picker tool to sample the color of the button on the UI

• Compare the sampled color with the expected blue color value

You can validate data presence in a table using Selenium by locating the table element and then searching for the desired value.

• Locate the table element using Selenium WebDriver

• Iterate through the rows and columns of the table to find the desired value

• Use assertions to validate if the value is present in the table

Negative test cases for site authentication

• Entering an incorrect username and password combination

• Leaving the username field blank and entering a valid password

• Leaving the password field blank and entering a valid username

• Entering a valid username and password combination but with additional spaces

• Entering a username and password that exceed the maximum character limit

• Entering special characters in the username or password fields

SDLC is a process followed for software development. Test cases for T.V. include image quality, sound quality, remote control functionality, etc. Short term goal is to learn new skills. Long term goal is to become a team lead.

• SDLC is Software Development Life Cycle

• It includes planning, designing, coding, testing, and maintenance

• Test cases for T.V. include checking image and sound quality, remote control functionality, connectivity, etc.

• Short term goal is to learn new skills a...read more

Data query language is used to retrieve data from a database, while data definition language is used to define and modify the structure of a database.

• Data query language (DQL) is used to retrieve data from a database, such as SQL SELECT statement.

• Data definition language (DDL) is used to define and modify the structure of a database, such as SQL CREATE TABLE statement.

• DQL focuses on querying and retrieving data, while DDL focuses on defining and modifying the database schema....read more

There are multiple web element selectors used in QA testing, such as ID, class name, name, tag name, link text, partial link text, xpath, and css selector.

• ID selector - Selects an element based on its ID attribute

• Class name selector - Selects elements based on their class attribute

• Name selector - Selects elements based on their name attribute

• Tag name selector - Selects elements based on their tag name

• Link text selector - Selects elements based on their exact text

• Partial link...read more

The maximum number of floors from which you can drop an egg without breaking is determined using a binary search approach.

• Start by dropping the first egg from the 14th floor, then increment by 13 floors (13, 12, 11, ...) until the first egg breaks.

• Once the first egg breaks, use the second egg to test each floor starting from the last unbroken floor.

• The optimal solution involves dropping the first egg at intervals that decrease by 1 each time (14, 13, 12, ...).

A test plan is a document outlining the scope, approach, resources, and schedule for testing a software application.

• Identify test objectives and scope

• Define test strategies and methodologies

• List resources and tools required for testing

• Outline test schedule and milestones

• Specify test cases and scenarios

• Include risk assessment and mitigation plan

Regression, Sanity, and Smoke testing are different types of testing performed at different stages of the software development lifecycle.

• Regression testing is performed to ensure that new code changes have not adversely affected existing functionality.

• Sanity testing is a subset of regression testing and is performed to quickly determine if a new build is stable enough for more rigorous testing.

• Smoke testing is performed to check if the critical functionalities of the software...read more

Identify bugs and test cases on a specific PDP page

• Check for broken links or images on the page

• Verify that all product information is displayed correctly

• Test the add to cart functionality

• Ensure that the product price is accurate

• Validate the product reviews section

A high severity low priority bug is a software defect that has a significant impact on the system but can be deferred for a later release.

• It is a bug that affects a critical functionality of the system

• It does not require an immediate fix and can be postponed

• It may not affect the end user experience directly

• It can be fixed in a future release or patch

• Examples include cosmetic issues, minor UI glitches, etc.

Register color coding is used to identify the resistance value of electronic components. Sample resistance color coding can be calculated using the color bands on the resistor.

• Register color coding uses colored bands to represent different digits and multipliers for resistance values.

• To calculate the resistance value of a resistor, you need to identify the color bands and their corresponding values.

• For example, a resistor with color bands of brown, black, red, and gold repres...read more

Reducing latency in TDMA can be achieved by optimizing time slot allocation, reducing frame size, and implementing efficient scheduling algorithms.

• Optimize time slot allocation to minimize idle time between transmissions.

• Reduce frame size to decrease the time required for transmitting a complete frame.

• Implement efficient scheduling algorithms to prioritize critical data and reduce waiting time.

• Use advanced modulation techniques to increase the data rate within each time slot....read more

QA's main work is to ensure quality of software by testing and identifying bugs and errors.

• QA's main work is to test software and identify bugs and errors

• They ensure that the software meets the requirements and specifications

• Bugs are coding mistakes that cause unexpected behavior

• Errors are mistakes made by the user that cause the software to fail

• QA engineers use various testing techniques to identify and report bugs and errors

Web locators include ID, name, class name, tag name, link text, and partial link text. Web driver supports implicit, explicit, and fluent waits.

• Web locators are used to identify elements on a web page

• ID and name locators are unique to an element

• Class name and tag name locators can identify multiple elements

• Link text and partial link text locators are used for links

• Implicit waits wait for a certain amount of time before throwing an exception

• Explicit waits wait for a certain co...read more