1000+ QA Engineer Interview Questions and Answers

Minimum 31 socks need to be taken out to get 15 pairs of socks

• To get 15 pairs of socks, you need to have 30 socks of different colors

• After taking out 30 socks, the next sock you take out will complete the 15 pairs

• So, minimum 31 socks need to be taken out to get 15 pairs of socks

To justify my view, I would communicate the reasons for the extended timeline and propose alternative solutions.

• Explain the complexity of the task and the potential risks involved

• Provide a detailed breakdown of the required steps and estimated time for each

• Highlight any dependencies or constraints that may impact the timeline

• Suggest alternative approaches or resources to expedite the task

• Discuss the potential consequences of rushing the task and the impact on quality

A list of questions asked in a QA Engineer interview covering topics such as Selenium, Java, and TestNG.

• Accessing Amazon page without using driver.get

• Getting the last second window in Selenium using getWindowHandles()

• Selecting multiple values in drop downs

• Swapping numbers without using a third variable

• Working with collections and strings

• Removing spaces in a string

• Printing words in a sentence on separate lines

• Understanding exceptions and using throw vs throws

• Working with inter...read more

The number of apples eaten on the first day can be calculated by working backwards from the total number of apples eaten over 5 days.

• Calculate the total number of apples eaten over 5 days: 100 apples

• Subtract the apples eaten on the 2nd day (6 more than the 1st day), 3rd day (6 more than the 2nd day), and so on until the 5th day to find the apples eaten on the 1st day

• Example: 1st day = x, 2nd day = x + 6, 3rd day = x + 12, 4th day = x + 18, 5th day = x + 24. Total = 100 apples

The weight of the pen is 4 kg.

• To find the weight of the pen, we can set up the equation: pen weight = 2 kg + 1/2 of its own weight

• Let x be the weight of the pen. The equation becomes: x = 2 + 1/2 * x

• Solving for x, we get x = 4 kg

When designing an online carrom game, the saved data when the game is paused and resumed should include player scores, positions of coins, game state, and timer status.

• Player scores should be saved to ensure continuity.

• Positions of coins on the board should be saved to resume the game accurately.

• Game state (such as whose turn it is) should be saved to maintain the flow.

• Timer status should be saved to resume the game with the correct time remaining.

We use JIRA as our bug tracking tool and TestRail as our test management tool.

• JIRA is a widely used bug tracking tool that helps us track and manage software defects.

• TestRail is a comprehensive test management tool that allows us to plan, track, and organize our testing efforts.

• Both tools integrate well with our development and testing processes, providing us with a seamless workflow.

• JIRA offers features like issue tracking, customizable workflows, and extensive reporting cap...read more

To correct the labels on 3 boxes with jumbled fruit labels, the least number of steps required is 2.

• Pick a fruit from the box labeled 'apples + oranges', since it must contain both fruits.

• Then pick a fruit from the box labeled 'oranges', as it cannot contain apples.

Questions on Java, API testing, Selenium, and SQL

• Java: OOPs concepts, initializing private elements, defining strings, exceptions, difference between exception and error, checked and unchecked exceptions

• API testing: Testing POST query, drawbacks, response codes

• Selenium: Assert vs verify, drawbacks, implicit and dynamic wait, types of testing supported, types of x-path

• SQL: Select query

To test an application on a remote server, use remote access tools like SSH or RDP. For local testing, use a local machine.

• For testing on a remote server, use remote access tools like SSH (Secure Shell) or RDP (Remote Desktop Protocol).

• Connect to the remote server using the appropriate credentials.

• Install the application on the remote server and perform the necessary tests.

• For local testing, set up a local machine with the required environment.

• Install the application on the l...read more

To calculate 15 mins using 11 mins and 7 mins hourglasses, start both hourglasses together. When the 7 mins hourglass runs out, flip it. When the 11 mins hourglass runs out, flip the 7 mins hourglass. When the 7 mins hourglass runs out again, 15 mins have passed.

• Start both hourglasses together

• When the 7 mins hourglass runs out, flip it

• When the 11 mins hourglass runs out, flip the 7 mins hourglass

• When the 7 mins hourglass runs out again, 15 mins have passed

Sanity, smoke, and regression testing are performed at different stages of software development to ensure quality and stability.

• Sanity testing is performed after a small change or bug fix to ensure that the core functionality of the software is still intact.

• Smoke testing is performed to check the basic functionality of the software after a build or release.

• Regression testing is performed to ensure that the existing functionality of the software is not affected by new changes ...read more

Answers to common questions asked in a QA Engineer interview

• Software testing is the process of evaluating a software application or system to find defects or bugs

• Manual testing is the process of testing software manually without the use of automated tools

• Regression testing is the process of testing changes made to a software application to ensure that existing functionality still works

• Retesting is the process of testing a defect that has been fixed to ensure that it has been ...read more

Defects on line can be solved by identifying the root cause, implementing corrective actions, and conducting thorough testing.

• Identify the root cause of the defect

• Implement corrective actions to fix the issue

• Conduct thorough testing to ensure the defect has been resolved

• Document the defect and the steps taken to resolve it for future reference

Testing without a specification requirement document requires a creative and exploratory approach.

• Analyze the available information and gather requirements from stakeholders.

• Create test scenarios and test cases based on assumptions and common usage patterns.

• Perform exploratory testing to uncover any unexpected behavior.

• Use risk-based testing to prioritize areas of the application that are critical or prone to defects.

• Leverage past experience and knowledge of similar systems t...read more

Query to get the second highest salary of an employee in DB testing.

• Use the SELECT statement to retrieve the salary column from the employee table.

• Order the results in descending order using the ORDER BY clause.

• Use the LIMIT clause to limit the result to the second row.

• Combine the above steps in a single query to get the second highest salary.

Selenium is a tool used for automating web browsers. Framework can be fixed by identifying and resolving issues. Navigation tools can be written using Selenium commands.

• Selenium is a popular open-source tool for automating web browsers

• To fix a framework, identify and resolve issues with the code

• Navigation tools can be written using Selenium commands like 'get', 'click', 'sendKeys', etc.

Interview questions for QA Engineer including Selenium, Rest API, Java collection, and programming based on data structures.

• Demonstrate ability to write Selenium code from scratch

• Show proficiency in writing Rest API code from scratch

• Exhibit knowledge of Java collection and its implementation

• Be able to write programs based on data structures like counting each element of a string and finding duplicates

• Use algorithms with O(n) complexity instead of O(n^2)

• Have a strong understan...read more

Fill 4L using 5L and 3L jugs with minimum water wastage

• Fill the 3L jug and pour it into the 5L jug, leaving 1L in the 3L jug

• Empty the 5L jug, then pour the 1L from the 3L jug into the 5L jug

• Fill the 3L jug again and pour it into the 5L jug, now you have 4L in the 5L jug

Different bodies that certify the quality of a system include ISO, CMMI, IEEE, and FDA.

• ISO (International Organization for Standardization) provides certification for various quality management systems.

• CMMI (Capability Maturity Model Integration) certifies the maturity level of an organization's processes.

• IEEE (Institute of Electrical and Electronics Engineers) sets standards for software quality assurance.

• FDA (Food and Drug Administration) certifies the quality of medical de...read more

Quality assurance ensures quality in the entire software development process, quality control ensures quality in the product, and testing is the process of finding defects.

• Quality assurance focuses on preventing defects by establishing processes and standards.

• Quality control focuses on identifying defects in the product through inspections and testing.

• Testing is the process of executing the software to find defects and ensure it meets requirements.

• Quality assurance and qualit...read more

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

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

Use alternative methods like JavaScript executor or actions class to interact with the element.

• Try using JavaScript executor to click the element

• Use actions class to perform a click action on the element

• Check if there are any alternative ways to interact with the element, like triggering a hover event before clicking

• Inspect the element and verify if it has any other clickable areas or child elements that can be clicked instead

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

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

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

Our company uses Selenium for UI automation and RestAssured for API automation.

• Selenium is used for UI automation

• RestAssured is used for API automation

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

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.

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

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

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().