Power2sme Junior Engineer - Quality Assurance Interview Questions and Answers

In the first round test was conducted on hackerrank platform
it consist of one coding question and one sql question and total 4 mcq are there
the difficulty of coding(dsa) problem is leetcode medium-hard and sql is hard

Q1. 1. Maths puzzle 2. a dp question 3. questions on inheritance 4. some css related question 5. dom application and why we are using dom? 6. DBMS questions
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Q2. Dp question and then optimised to o(n) solution
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Q3. Questions on oops and inheritance
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Q1. 1. some projects that i did 2. why you want to join bizongo? 3. what will you bring to the company if we select you? 4. some behavioural questions...
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Q1. Easy basics questions asked
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Q1. Easy basics questions asked
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Q1. System design was asked
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Q1. Asked core java question
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Q1. Asked dsa questions
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Given programming questions
String programs

Q1. Asked basic to intermediate level questions Datatypes OOP concepts Code snippets
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Q1. 1. Basic OOP Concepts 2. Difference between structure and class in terms of constructor 3. Can members of structure be defined as private 4. What's lambda function and it's real life use case 5. Difference...read more
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Q2. 6. What's O(n) in time and space complexity
Ans. 
O(n) refers to linear time and space complexity.
• O(n) means that the time or space required by an algorithm grows linearly with the size of the input.

• It implies that the algorithm's performance is directly proportional to the input size.

• For example, if an algorithm takes 10 seconds to process 100 elements, it would take 20 seconds to process 200 elements.

• O(n) complexity is considered efficient and desirable in most case
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Aptitude question based on time speed and logic

Q1. Ques on linked list and some more coding ques
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It was both aptitude and coding test.
Comprises of around same weightage.
Coding questions were some famous easy questions.

Q1. Most of the coding questions were from Linked list. Few from database and SQL.
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Q2. Adding a node in LinkedList, removal of a duplicate node in LinkedList.
Ans. 
Adding a node in LinkedList involves creating a new node and updating pointers. Removing a duplicate node requires iterating through the list and comparing values.
• To add a node, create a new node with the desired value and update pointers accordingly.

• To remove a duplicate node, iterate through the list and compare each node's value with others to identify duplicates.

• After identifying a duplicate node, update pointers t
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Q3. A query to give the sum of salary of common department.
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Q1. A bit conceptual round. A Linked list question and few HR questions.
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Q1. What is difference between list and tuple?
Ans. 
List is mutable and can be modified, while tuple is immutable and cannot be modified.
• List is defined using square brackets [], while tuple is defined using parentheses ().

• Elements in a list can be added, removed, or modified, while elements in a tuple cannot be modified.

• Lists are typically used for collections of similar items, while tuples are used for collections of different items.

• Lists have more built-in methods an...read more
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Q2. Find second highest salary of employee using django orm?
Ans. 
Find second highest salary of employee using Django ORM.
• Use the Django ORM to query the Employee model

• Order the employees by salary in descending order

• Skip the first employee (highest salary) and get the second employee (second highest salary)
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Q3. Find no of occurance in list output in dict
Ans. 
The question asks to find the number of occurrences of each element in a list and output the result in a dictionary.
• Iterate through the list and use a dictionary to keep track of the count of each element.

• If an element is already in the dictionary, increment its count by 1. Otherwise, add it to the dictionary with a count of 1.

• Finally, return the dictionary with the counts of each element.
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Q4. What is django middleware?
Ans. 
Django middleware is a component that sits between the web server and the view, allowing for processing of requests and responses.
• Middleware is a way to modify or process requests and responses globally in a Django application.

• It can be used for authentication, session management, caching, logging, and more.

• Middleware classes are defined in settings.py and executed in order.

• Examples of middleware include Authentication...read more
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Q5. What is decorator?
Ans. 
A decorator is a design pattern that allows behavior to be added to an individual object dynamically.
• Decorators enhance the functionality of an object without modifying its structure.

• They provide a flexible alternative to subclassing for extending functionality.

• Decorators can be stacked to add multiple behaviors to an object.

• Examples of decorators include logging, caching, and authentication decorators.
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Q6. What is generator?
Ans. 
A generator is a function that can be paused and resumed, allowing it to produce a sequence of values over time.
• Generators are defined using the function* syntax in JavaScript.

• They use the yield keyword to pause execution and return a value.

• Generators can be iterated over using a for...of loop.

• They are useful for generating infinite sequences or lazily computing values.
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