eNoah iSolution Mern Stack Developer Interview Questions and Answers

1 Hours aptitude test on hacker rank based on Aptitude question, Java, SQL

Q1. Java interview questions.
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Q2. What is wrapper class?
Ans. 
Wrapper class is a class that wraps around a primitive data type and provides additional functionality.
• Wrapper classes in Java are used to convert primitive data types into objects.

• They provide methods to access the value of the wrapped primitive type.

• Examples include Integer, Double, Boolean, etc.
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Q1. Salary discussion and all.
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Q1. About HTML, CSS, JS, Python ?
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Q2. What is Self Keyword in python?
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The self keyword in Python is a reference to the current instance of a class.
• Self is the first parameter in the definition of instance methods within a class.

• It is used to access variables and methods within the class.

• Self is not a reserved keyword in Python, but it is a convention to use self as the first parameter in instance methods.
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Q1. They Not Schedule Client Interview
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Topics consist of profit-loss, probability, permutation combination etc.

Coding question related to topics array and strings.

Q1. Questions related to Java, oops, DBMS and tech-stack are mention in the resume
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Q2. Role of java in backend, explain polymorphism in oops, reverse string.
Ans. 
Java is a popular backend language, polymorphism allows objects to be treated as instances of their parent class, reverse string by iterating through characters.
• Java is commonly used in backend development for its robustness and scalability.

• Polymorphism in OOP allows objects to be treated as instances of their parent class, enabling flexibility and reusability.

• To reverse a string, iterate through the characters from th...read more
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Q1. It also consists of technical questions, future goals, project discussion mentioned in the resume and related tech stack, future goals, etc.
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Q1. My knowledge and my complete core Java
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Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. Why should we hire you?
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Q4. Where do you see yourself in 5 years?
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Q5. What are your strengths and weaknesses?
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Q6. Tell me about yourself.
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Q7. My overall my communication skills
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Q1. My complete java full stack developer basic concepts
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Q1. My strength and and my weakness
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Coding programming

Round duration - 30 minutes
Round difficulty - Medium

Basic questions from Operating System, Object Oriented Programming, DBMS, various tech stacks used in project. Be through with the basics of these subjects. Like in my case DDL and scheduling algorithms were asked.
Asked questions related on css,javascript and some sql queries. Interviewer was helpful. If one gives a answer that is not exactly correct, he provided me hints .

Q1. OS Question
CPU scheduling algorithms
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Q2. Remove character
For a given string(str) and a character X, write a function to remove all the occurrences of X from the given string and return it.
The input string will remain unchanged if the given ch...read more
Ans. Iterative Solution
• We create an empty string that will store our final result. We will return it at the end.
• We iterate from 0 to the length of the string. Say, our loop variable is i. We can then access the ith character as input[i]
• If the ith character equals the character c i.e input[i] == c, then we skip this character and do nothing.
• Else we need to append the character to the output string.
• We finally return the outpu...read more
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