1000+ QA Engineer Interview Questions and Answers

ETL stands for Extract, Transform, Load. It is a process used to extract data from various sources, transform it into a consistent format, and load it into a target database.

• ETL involves three main layers: Extraction, Transformation, and Loading.

• Extraction: Data is extracted from various sources such as databases, files, APIs, etc.

• Transformation: Data is cleaned, validated, and transformed into a consistent format.

• Loading: Transformed data is loaded into a target database or ...read more

ISO, IATF, EMS, OH&S are international standards for quality management, environmental management, and occupational health and safety.

• ISO (International Organization for Standardization) sets standards for quality management systems (QMS) and has revised its latest version to ISO 9001:2015

• IATF (International Automotive Task Force) sets standards for quality management systems in the automotive industry and has revised its latest version to IATF 16949:2016

• EMS (Environmental Ma...read more

To cover the range of weights from 1-40 kgs, select weights in powers of 2.

• Select weights in powers of 2: 1, 2, 4, 8, 16, 32

• These weights can cover the complete range from 1-40 kgs

• Example: 1 kg + 2 kg + 4 kg + 8 kg + 16 kg + 32 kg = 63 kgs

There are multiple ways to find elements on a page in Selenium, including by ID, name, class name, tag name, link text, partial link text, XPath, and CSS selector.

• By ID: driver.findElement(By.id("elementId"))

• By name: driver.findElement(By.name("elementName"))

• By class name: driver.findElement(By.className("className"))

• By tag name: driver.findElement(By.tagName("tagName"))

• By link text: driver.findElement(By.linkText("linkText"))

• By partial link text: driver.findElement(By.partia...read more

A test automation framework consists of different parts like libraries, tools, and guidelines to support automated testing.

• Libraries: reusable code modules for common functions like data manipulation, assertions, and interactions with the application under test

• Tools: software programs used to create, execute, and manage automated tests, such as Selenium, Appium, or JUnit

• Guidelines: best practices and standards for writing test scripts, organizing test cases, and reporting tes...read more

Test cases for Recruit CRM sign up/login page

• Positive test case: Enter valid email and password to sign up/login

• Negative test case: Enter invalid email and password to sign up/login

• Negative test case: Leave email or password field blank and try to sign up/login

• Negative test case: Enter email and password in wrong format and try to sign up/login

Selenium IDE is a record and playback tool for automating web applications. Manual testing is done by humans, while automation is done by machines.

• Selenium IDE is a browser extension that records user actions and generates automated test scripts.

• Manual testing involves human testers executing test cases and verifying results.

• Automation testing involves using tools to execute test cases and compare actual results with expected results.

• Manual testing is time-consuming and prone...read more

Calibration instrument is a process of removing errors between instruments and providing NABL certificate.

• Calibration is the process of adjusting an instrument to provide accurate results.

• It involves comparing the readings of the instrument with a known standard.

• The errors are then removed by adjusting the instrument accordingly.

• NABL (National Accreditation Board for Testing and Calibration Laboratories) certificate is provided to ensure the accuracy of the instrument.

• Calibra...read more

Process is a set of steps to achieve a desired outcome. To handle a line without breakdowns or defects, take containment, corrective and preventive actions.

• Identify potential issues and establish preventive measures

• Implement quality control checks at each stage of the process

• Train employees on proper procedures and provide ongoing support

• Conduct regular audits to identify areas for improvement

• Take immediate corrective action when issues arise

• Implement a containment plan to pr...read more

Pass page number and page size as query parameters for pagination in API.

• Pass 'page' parameter to specify the page number

• Pass 'pageSize' parameter to specify the number of items per page

I listen to their complaint, apologize for the inconvenience caused, and work towards finding a solution to their problem.

• Listen attentively to the customer's complaint

• Apologize for the inconvenience caused

• Ask questions to understand the issue better

• Offer a solution or escalate the issue to the appropriate team

• Follow up with the customer to ensure their issue has been resolved

I will buy a particular vehicle by considering my budget, researching different models, test driving them, and negotiating the price.

• Determine my budget for the vehicle

• Research different vehicle models that meet my requirements

• Test drive the shortlisted vehicles to assess their performance and comfort

• Compare prices from different sellers and negotiate for the best deal

Interview questions for QA Engineer

• Reverse a string using StringBuilder or StringBuffer

• Find second highest number by sorting the array and accessing the second last element

• String is immutable while StringBuffer is mutable

• HashMap stores key-value pairs while HashSet stores only keys

• Instance variables are declared inside a class while local variables are declared inside a method

• Primitive data types are int, float, double, etc. while non-primitive data types are arrays, classes,...read more

LeetCode problem 14 involves finding the longest common prefix among an array of strings.

• Iterate through the array of strings, comparing characters of each string.

• Use the first string as a reference and compare it with others.

• Stop when characters don't match or when reaching the end of any string.

• Example: For ['flower', 'flow', 'flight'], the common prefix is 'fl'.

Test case format and examples for lift and login page

• Test case format includes test case ID, description, preconditions, test steps, expected results, and actual results

• Positive test case for lift page: ID-001, description-Verify if the lift goes up when the up button is pressed, preconditions-Lift is on the ground floor, test steps-Press the up button, expected results-Lift goes up, actual results-Lift goes up

• Negative test case for lift page: ID-002, description-Verify if th...read more

Unit Testing

• Unit Testing is a type of testing where individual components or units of a software are tested.

• It focuses on verifying the functionality of each unit in isolation.

• It is usually performed by developers during the development process.

• Examples of unit testing frameworks include JUnit for Java and NUnit for .NET.

Severity refers to the impact of a defect on the system, while priority determines the order in which defects should be fixed.

• Severity is about the seriousness of a defect, while priority is about the order of fixing it.

• Severity is often categorized as high, medium, or low, while priority is typically assigned as high, medium, or low.

• For example, a critical defect that causes the system to crash would have high severity and high priority, while a cosmetic defect with low impa...read more

I implemented several steps to improve the CSAT of my previous process.

• Conducted thorough analysis of customer feedback

• Identified common pain points and areas of improvement

• Collaborated with cross-functional teams to implement necessary changes

• Implemented regular training sessions for support agents

• Introduced automated testing to ensure product quality

• Established a proactive approach to customer support

Yes, API testing involves testing the functionality, reliability, performance, and security of APIs.

• API testing involves verifying that the API meets the requirements in terms of functionality, reliability, performance, and security.

• It includes testing different types of APIs such as REST, SOAP, and GraphQL.

• Tools like Postman, SoapUI, and JMeter are commonly used for API testing.

• API testing can involve testing endpoints, data validation, error codes, authentication, and respo...read more

DQL stands for Document Query Language. It is used to query documents in a document-oriented database like MongoDB.

• DQL is used to retrieve documents from a MongoDB database.

• It supports a wide range of query operators and expressions.

• DQL can be used to perform complex queries on nested documents.

• It also supports aggregation pipeline for advanced data processing.

• Examples of DQL queries include find(), findOne(), and aggregate().

Automation testing tools like Selenium are needed to increase efficiency, accuracy, and coverage of testing processes.

• Automation tools help in executing repetitive test cases quickly and accurately.

• They can simulate user interactions with the application, covering a wide range of scenarios.

• Automation tools can run tests on multiple configurations and environments simultaneously.

• They provide detailed reports and logs for easy debugging and analysis.

• Automation testing tools hel...read more

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

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

To create a layout report for a specified part, I would use measurements, diagrams, and annotations.

• Take accurate measurements of the part using appropriate tools like calipers or rulers

• Create a detailed diagram of the part, including dimensions and key features

• Annotate the diagram with relevant information such as material type, tolerances, and any special instructions

• Include photographs of the part from different angles to provide visual reference

• Organize the layout report ...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.