Mastech InfoTrellis Interview Questions and Answers

Basic JavaScript output-based questions were presented in the form of multiple-choice questions (MCQs).

Q1. What is custom diractives in Angular
Ans. 
Custom directives in Angular allow you to create reusable components with custom behavior.
• Custom directives are used to extend the functionality of HTML elements in Angular.

• They can be used to create reusable components with custom behavior.

• Directives are markers on a DOM element that tell Angular to attach a specified behavior to that DOM element or even transform the DOM element and its children.

• Examples include crea...read more
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Q2. What is pipes in Angular
Ans. 
Pipes in Angular are used for transforming data in templates.
• Pipes are used to format data before displaying it in the view.

• They can be used to filter, sort, or transform data in various ways.

• Examples include currency, date, uppercase, and lowercase pipes.
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Q3. What is interceptor in Angular
Ans. 
An interceptor in Angular is a service that can be used to intercept and modify HTTP requests and responses.
• Interceptors can be used to add headers, modify requests, handle errors, etc.

• They are implemented as classes that implement the HttpInterceptor interface.

• Interceptors are added to the HttpClientModule providers array in the app module.

• Example: LoggingInterceptor implements HttpInterceptor to log all HTTP requests
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Q1. Do you know writing Unit test case?
Ans. 
Yes, I am familiar with writing unit test cases to ensure code quality and functionality.
• I have experience writing unit test cases using testing frameworks like JUnit, NUnit, or pytest.

• I understand the importance of writing testable code and creating comprehensive test suites.

• I can write test cases to cover different scenarios, including edge cases and boundary conditions.

• I know how to use mocking frameworks like Mocki...read more
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Q2. What state management library do you have used?
Ans. 
I have used Redux for state management in my previous projects.
• Redux is a predictable state container for JavaScript apps.

• It helps in managing the state of the application in a single immutable state tree.

• Actions are dispatched to update the state and components can subscribe to changes.

• Selectors can be used to efficiently extract data from the state tree.

• Middleware can be added to handle asynchronous actions.

• Example:
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Q1. What is your expected Salary?
Ans. 
My expected salary is based on my experience, skills, and the market rate for Software Development Engineers.
• Research the average salary for Software Development Engineers in the specific location and industry

• Consider your years of experience and level of expertise

• Factor in any additional benefits or perks offered by the company

• Be prepared to negotiate based on the job responsibilities and requirements
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Q2. How soon would you be able to join if you receive the offer letter today?
Ans. 
I can join within 2 weeks of receiving the offer letter.
• I can start within 2 weeks of receiving the offer letter.

• I need to give notice at my current job before starting.

• I may need to relocate, which could affect my start date.
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Q1. All employees having same salary in the smae department sql and pysprk
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Q2. How to create pipeline in databricks
Ans. 
To create a pipeline in Databricks, you can use Databricks Jobs or Apache Airflow for orchestration.
• Use Databricks Jobs to create a pipeline by scheduling notebooks or Spark jobs.

• Utilize Apache Airflow for more complex pipeline orchestration with dependencies and monitoring.

• Leverage Databricks Delta for managing data pipelines with ACID transactions and versioning.
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Q3. Palindrome, 2nd char in every word make is to upper case, sql rank and dense rank releated questions , given 2 tables country and city we need to calculate total population in each continent by joining the...read more
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Q4. String manuplation questions inpython
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Q1. What is an abstract class?
Ans. 
An abstract class is a class that cannot be instantiated and may contain abstract methods that must be implemented by its subclasses.
• Cannot be instantiated directly

• May contain abstract methods

• Used as a blueprint for other classes
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Q2. What is abstraction?
Ans. 
Abstraction is the process of hiding complex details and showing only the essential features of an object or system.
• Abstraction allows us to focus on what an object does, rather than how it does it

• It helps in simplifying complex systems by breaking them down into smaller, more manageable parts

• Examples of abstraction include using a car without needing to understand its internal combustion engine, or using a smartphone
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Q3. Best sorting algo?time complexity of it?
Ans. 
QuickSort is one of the best sorting algorithms with an average time complexity of O(n log n).
• QuickSort is a divide and conquer algorithm that works by selecting a 'pivot' element and partitioning the array around the pivot.

• It has an average time complexity of O(n log n) and a worst-case time complexity of O(n^2).

• Example: ['apple', 'banana', 'cherry', 'date', 'fig'] can be sorted using QuickSort.

• Example: ['3', '1', '4'...read more
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Q4. You have been provided a sorted list time complexity achieved after we apply bubble sorting
Ans. 
Bubble sorting has a time complexity of O(n^2) for a sorted list.
• Bubble sorting has a worst-case time complexity of O(n^2) for a sorted list.

• The time complexity does not change even if the list is already sorted.

• Example: If we have a sorted list of size n, bubble sorting will still take O(n^2) time.
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Q1. Have you ever been to a state other than jharkhand?
Ans. 
Yes, I have been to multiple states other than Jharkhand.
• I have traveled to states like Maharashtra, Karnataka, and Tamil Nadu for work and leisure.

• I have visited tourist destinations in states like Rajasthan, Kerala, and Himachal Pradesh.

• I have family in states like Uttar Pradesh, Bihar, and West Bengal, which I have visited multiple times.
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Q1. What is the Java code for reversing a linked list?
Ans. 
Reversing a linked list in Java using iterative approach.
• Create three pointers: prev, current, and next.

• Iterate through the list, updating pointers to reverse the links.

• Return the new head of the reversed list.
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Q2. How do you handle the StaleElementReferenceException in your code?
Ans. 
Handle StaleElementReferenceException by re-locating the element before interacting with it.
• Use try-catch block to catch StaleElementReferenceException

• Re-locate the element using findElement method before interacting with it

• Use WebDriverWait to wait for the element to become stale
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Q1. Can you describe your project experiences?
Ans. 
I have worked on various projects involving test automation, performance testing, and quality assurance processes.
• Developed automated test scripts using Selenium WebDriver for web applications

• Conducted performance testing using JMeter to identify bottlenecks and optimize system performance

• Implemented quality assurance processes to ensure software meets requirements and standards

• Collaborated with cross-functional teams ...read more
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Q2. What is your strategy for designing an automation framework?
Ans. 
My strategy for designing an automation framework involves identifying key functionalities, selecting appropriate tools, creating reusable components, implementing robust error handling, and integrating with CI/CD pipelines.
• Identify key functionalities to be automated based on priority and impact on testing.

• Select appropriate tools and technologies based on the application under test and team expertise.

• Create reusable ...read more
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