Lumen Technologies Software QA Engineer Interview Questions and Answers

Q1. HR Asks general questions. past experience pass out year. current base out of and elaborated GD to me once again.
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Q1. Difference between List and Tuples? in python
Ans. 
List is mutable and Tuples are immutable in Python.
• Lists are enclosed in square brackets [], while Tuples are enclosed in parentheses ().

• Elements of a list can be changed, added or removed, while elements of a tuple cannot be changed.

• Lists are slower than tuples due to their mutable nature.

• Tuples are used for fixed data, while lists are used for dynamic data.

• Lists are used for homogenous data, while tuples are used for
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Q2. What Android basic component
Ans. 
The basic components of Android are activities, services, broadcast receivers, and content providers.
• Activities are the user interface components that allow users to interact with the app.

• Services are background components that perform long-running operations.

• Broadcast receivers are components that receive and respond to system-wide broadcast announcements.

• Content providers are components that manage a shared set of ap
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Q3. Explain about android architecture system.
Ans. 
Android architecture system is a layered architecture consisting of four main layers.
• The four main layers are Linux kernel, native libraries, application framework, and applications.

• The Linux kernel provides low-level hardware abstraction and security.

• Native libraries are written in C or C++ and provide access to hardware-specific features.

• Application framework provides high-level services such as activity management, ...read more
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Q4. How does Open GL graphics Works in android
Ans. 
OpenGL is a graphics API used in Android to render 2D and 3D graphics.
• OpenGL is a cross-platform API that allows developers to create high-performance graphics applications.

• It uses a pipeline-based model to process graphics data.

• OpenGL ES (Embedded Systems) is the version of OpenGL used in Android.

• It supports features like texture mapping, lighting, and shading.

• Developers can use OpenGL in Android to create games, visu...read more
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Q5. Design Test cases for A Deseal Car Engine. Cover all test cases
Ans. 
Design test cases for a deseal car engine
• Test for engine starting and stopping

• Test for oil pressure and temperature

• Test for fuel efficiency

• Test for exhaust emissions

• Test for engine noise and vibration
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Q1. I was asked about basic QA questions. One coding question on Recursion
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Q2. Coding question on Recursion
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List, Dictionries with API

Q1. Debug the test code written in Python
Ans. 
Debugging test code in Python
• Check for syntax errors and typos in the code

• Use print statements to track the flow of the code and identify any issues

• Review the logic of the code to ensure it is correctly implemented

• Utilize debugging tools like pdb or IDE debuggers to step through the code
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Q2. What is Python Path
Ans. 
Python Path is the location where Python is installed on a computer.
• Python Path is the directory where the Python interpreter is located.

• It is used by the operating system to find and execute Python scripts.

• The Python Path can be set as an environment variable to make it easier to run Python scripts from any directory.
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Round duration - 60 Minutes
Round difficulty - Medium

Timing: Morning
How was the environment? It happened in the Computer Lab of my institution
All students were assigned a computer and we had to solve questions on hackerrank

Q1. 
Order of People Heights Problem Statement
Consider 'N' individuals numbered from 0 to N-1 standing in a queue. You are provided with two arrays: Height and Infront, each consisting of 'N' non-negative int...read more
Ans. 
The task is to find the actual order of people in a queue based on their heights and the number of taller people in front of them.
• Iterate through the given arrays and create a list of tuples containing the height and number of taller people for each person.

• Sort the list of tuples in descending order of height and ascending order of the number of taller people.

• Create an empty result list and insert each tuple into the r...read more
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Round duration - 60 Minutes
Round difficulty - Medium

Round was a mix of concepts from OOPS, OS and Problem Solving

Q1. 
Binary Search Tree Value Finder
Given a Binary Search Tree (BST) and a key value 'X', determine if there exists a node within the BST containing the value 'X'.
Example:
Input:
Consider the tree represe...read more
Ans. 
The task is to find if a given value is present in a Binary Search Tree (BST).
• Start from the root node and compare the value with the target value.

• If the value matches, return true.

• If the target value is less than the current node value, move to the left child.

• If the target value is greater than the current node value, move to the right child.

• Repeat the process until a match is found or a leaf node is reached.

• If a leaf...read more
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