Quest Global V&V Engineer Interview Questions and Answers

Q1. They asked me to write a dockerfile
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Q2. Minimal questions about linux
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Q1. What is inheritance
Ans. 
Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.
• Allows for code reusability by creating a new class based on an existing class

• Derived class (subclass) inherits properties and behaviors from a base class (superclass)

• Can have multiple levels of inheritance, creating a hierarchy of classes

• Example: Animal class can be a base class with Dog and Cat
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Q2. What is polymorphism
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Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or classes.

• Examples include method overloading and method overriding in object-oriented programming.
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Q3. Write a code for string reverse
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Code to reverse a string using array of characters
• Iterate through half of the string and swap characters from start and end

• Use a temporary variable to store the character being swapped

• Handle edge cases like empty string or single character string
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Q1. Questions on streams rest api
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Q1. Managerial discussion
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Q1. What is abstraction and how can we achieve it?
Ans. 
Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the outside world.
• Abstraction allows us to focus on what an object does rather than how it does it

• Achieved through abstract classes and interfaces in object-oriented programming

• Example: A car dashboard abstracts the internal workings of the car and provides only essential information to the driver
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Q2. Difference between hashtable and hashmap
Ans. 
Hashtable is synchronized, while hashmap is not. Hashtable does not allow null keys or values, while hashmap does.
• Hashtable is synchronized, while hashmap is not

• Hashtable does not allow null keys or values, while hashmap does

• Hashtable is a legacy class, while hashmap is a newer class
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Q3. How get() works insterally in hashmap
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The get() method in HashMap retrieves the value associated with a specified key.
• get() method takes a key as input and returns the value associated with that key in the HashMap.

• Internally, get() uses the hash code of the key to find the corresponding bucket in the HashMap.

• If multiple keys have the same hash code, get() uses the equals() method to find the correct key-value pair.
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Q4. What is normalization?
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Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization helps in minimizing data redundancy by dividing the database into multiple tables and defining relationships between them.

• It ensures data integrity by avoiding update anomalies and inconsistencies.

• There are different normal forms such as 1NF, 2NF, 3NF, BCNF, and 4NF, each with specific rules to fo...read more
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Q5. What are constraints?
Ans. 
Constraints are limitations or restrictions placed on a system or process.
• Constraints define the boundaries within which a system must operate.

• They can include limitations on resources, time, or functionality.

• Examples of constraints in software engineering include memory limitations, processing speed, and input/output requirements.
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Q6. Write a query to get 3rd highest salary from the employee table
Ans. 
Query to retrieve the 3rd highest salary from the employee table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to retrieve the 3rd highest salary
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Q7. Write a code to get 2nd last node and its value from the singly linked list.
Ans. 
Traverse the linked list to find the 2nd last node and return its value.
• Traverse the linked list while keeping track of the current and previous nodes.

• Once at the end of the list, return the value of the previous node.
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Q8. You have an array of integer and retrieve the 2 smallest number from it without sorting the array.
Ans. 
Use two variables to keep track of the smallest and second smallest numbers in the array.
• Iterate through the array and update the variables accordingly.

• Initialize the variables with the maximum possible integer value to start with.

• Example: array = [5, 2, 8, 1, 3], smallest = 1, secondSmallest = 2.
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Q1. Linux related questions
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Q2. Networking related
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Techinal - 30mins,Aptitude - 15mins

4 coding question in two different language

Q1. Concepts and coding for 50 mins
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Q1. Projects, concepts coding for 50 mins
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Q1. Sql,logical resoning,projects, technical for 50 mins
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Q1. Normal hr Interview, like salary discussion
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Q1. Java, spring framework, hibernate questions
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Q1. Java, spring boot, design
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Q1. Why are you switching comany ? and Salary Expectations
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Merit and demerit of Machine learning ?

General Aptitude and reasoning

Q1. Oops concept, DBMS , Data Structure
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Q2. What is Normalisation?
Ans. 
Normalisation is the process of organizing data in a database to reduce redundancy and improve data integrity.
• It involves dividing larger tables into smaller ones and defining relationships between them.

• Normalization helps to eliminate data inconsistencies and anomalies.

• There are different levels of normalization, such as first normal form (1NF), second normal form (2NF), and so on.

• Normalization can improve database pe...read more
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Q3. What is polimorphism?
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Polymorphism is the ability of an object to take on many forms.
• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A shape class can have multiple subclasses like circle, square, etc. and all can be treated as shapes.

• Example: A method can take an object of a parent class as a parameter and it can accept a
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Q4. What is Stack and Pre and post Tree formation
Ans. 
Stack is a data structure that follows LIFO. Pre and post tree formation are methods of traversing a tree.
• Stack is used for backtracking, undoing, and recursion.

• Pre-order traversal visits the root node first, then left subtree, then right subtree.

• Post-order traversal visits the left subtree, then right subtree, then root node.
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Q1. Tell me about yourself
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Q2. Tell me About company ?
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