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 - Easy

It was in the morning. Because of covid test was from home. We had 50 MCQ and 1 coding question. The coding question was pretty easy. MCQ were mixed, we even had questions from machine learning.

Q1. 
Maximum Path Sum Between Two Leaves
Given a non-empty binary tree where each node has a non-negative integer value, determine the maximum possible sum of the path between any two leaves of the given tree.
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Ans. 
Find the maximum path sum between two leaf nodes in a binary tree.
• Traverse the tree to find the maximum path sum between two leaf nodes

• Consider both cases where the path passes through the root and where it doesn't

• Keep track of the maximum sum while traversing the tree
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Round duration - 60 minutes
Round difficulty - Medium

Interview round. Questions were based on projects, database and one coding question

Q1. 
Longest Subarray Zero Sum Problem Statement
Given an array of integers arr, determine the length of the longest contiguous subarray that sums to zero.
Input:
N (an integer, the length of the array)
arr (...read more
Ans. 
Find the length of the longest contiguous subarray that sums to zero in an array of integers.
• Use a hashmap to store the cumulative sum and its corresponding index.

• Iterate through the array, updating the sum and checking if the current sum exists in the hashmap.

• If the sum exists in the hashmap, update the maximum length of subarray with sum zero.

• Return the maximum length of subarray with sum zero.
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Round duration - 40 minutes
Round difficulty - Easy

Managerial round. Was asked questions on projects and management

Round duration - 10 minutes
Round difficulty - Easy

HR just asked about basic stuffs and all. Nothing technical