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42Gears Mobility Systems Interview Questions and Answers for Freshers
10 Interview questions
The Two Sum problem involves finding two numbers in an array that add up to a specific target sum.
Use a hash map to store numbers and their indices for quick lookup.
Iterate through the array, calculating the complement (target - current number).
Check if the complement exists in the hash map; if yes, return the indices.
Example: For nums = [2, 7, 11, 15] and target = 9, return [0, 1] because 2 + 7 = 9.
final, finally, and finalize are keywords in Java with distinct purposes related to variable declaration, exception handling, and method behavior.
final: Used to declare constants. Example: final int MAX_VALUE = 100;
finally: A block that executes after try-catch, regardless of exceptions. Example: try { ... } catch { ... } finally { ... };
finalize: A method called by the garbage collector before an object is remove...
To find the minimum number of swaps needed to sort an array
Use graph theory to find cycles in the array
Count the number of swaps needed to fix each cycle
Add up the swaps needed for all cycles to get the total minimum swaps
Array List can be implemented in a stack by using an array and keeping track of the top element.
Create an array to store the elements of the stack.
Keep track of the top element using a variable.
For push operation, add the element to the top of the stack and increment the top index.
For pop operation, remove the top element and decrement the top index.
Find the 3rd largest number in an array without sorting by tracking the largest values.
Initialize three variables: first, second, and third to hold the largest, second largest, and third largest values.
Iterate through the array, updating these variables as needed.
Example: For array [3, 1, 4, 4, 5], first = 5, second = 4, third = 3.
Handle cases where there are duplicates by ensuring the values are distinct.
Expression Equality Checker
Given two strings representing expressions in variables, determine if they are equivalent. Return 'YES' if the expressions are identical and 'NO' if they are different. Each exp...
Check if two expressions are equivalent by evaluating them with different variable assignments.
Parse the expressions to evaluate them with different variable assignments.
Use a stack to keep track of operands and operators while evaluating the expressions.
Compare the results of both expressions to determine if they are equivalent.
Longest Increasing Subsequence Problem Statement
Given an array of integers with 'N' elements, determine the length of the longest subsequence where each element is greater than the previous element. This ...
Find the length of the longest strictly increasing subsequence in an array of integers.
Use dynamic programming to solve this problem efficiently.
Initialize an array to store the length of the longest increasing subsequence ending at each index.
Iterate through the array and update the length of the longest increasing subsequence for each element.
Return the maximum value in the array as the result.
Cycle Detection in a Singly Linked List
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's next points back to a previous node in the l...
Detect if a singly linked list forms a cycle by checking if a node's next points back to a previous node.
Traverse the linked list using two pointers, one moving one step at a time and the other moving two steps at a time.
If the two pointers meet at any point, it indicates the presence of a cycle in the linked list.
To optimize, use Floyd's cycle detection algorithm for O(N) time complexity and O(1) space complexity...
Matrix Element Cube Sum Problem
For a given M x N sized 2D array 'MATRIX', find and return the value of (i * i + j * j) for elements where the sum of the cubes of its digits equals the element itself. Here...
Find and return the value of (i * i + j * j) for elements in a 2D array where the sum of the cubes of its digits equals the element itself.
Iterate through the 2D array and check if the sum of the cubes of the digits equals the element itself.
Calculate (i * i + j * j) for elements that satisfy the condition.
Return the calculated values as output.
If no element satisfies the condition, return -1.
Convert Binary Tree to Mirror Tree
Convert a given binary tree into its mirror tree, where the left and right children of all non-leaf nodes are interchanged.
Input:
An integer ‘T’ denoting the number of...Convert a binary tree into its mirror tree by interchanging left and right children of non-leaf nodes.
Traverse the tree in a recursive manner and swap the left and right children of each node.
Modify the binary tree in place to get the mirror, without creating a new tree.
Use a temporary variable to swap the left and right children of each node.
42Gears Mobility Systems Interview Experiences for Freshers
4 interviews found
Anonymous
Selected
I appeared for an interview in May 2025, where I was asked the following questions.
- Q1. Questions based on resume
- Q2. Question based on resume
Interview Preparation Tips
Harshith M P 1SG20IS036
Selected
I applied via Recruitment Consulltant and was interviewed in Aug 2024. There were 3 interview rounds.
Aptitude Had around 50 Questions which cover Logical,Quantitative, Code snippets
(3 Questions)
- Q1. Two Sum in Coding
- Q2. Differences in final,Finally,Finalize
- Q3. Basic Sql operations
(3 Questions)
- Q1. Array List Implementation in Stack for Push and pop
- Q2. Finding 3rd Largest Number in an Array without using Sort
- Q3. Finding the min number of Swap in Sorting of Array
Interview Preparation Tips
Skills evaluated in this interview
I appeared for an interview in Oct 2020.
(2 Questions)
Round duration - 180 Minutes
Round difficulty - Easy
It was from 8 to 11 in the morning. Basic aptitude MCQs were there and 2 coding questions were there.
- Q1.
Expression Equality Checker
Given two strings representing expressions in variables, determine if they are equivalent. Return 'YES' if the expressions are identical and 'NO' if they are different. Each ex...
- Ans.
Check if two expressions are equivalent by evaluating them with different variable assignments.
Parse the expressions to evaluate them with different variable assignments.
Use a stack to keep track of operands and operators while evaluating the expressions.
Compare the results of both expressions to determine if they are equivalent.
- Q2.
Longest Increasing Subsequence Problem Statement
Given an array of integers with 'N' elements, determine the length of the longest subsequence where each element is greater than the previous element. This...
(2 Questions)
Round duration - 32 Minutes
Round difficulty - Easy
It was my first face to face technical round. DSA questions of easy-medium type were asked. And some discussion on the project was there.
- Q1.
Cycle Detection in a Singly Linked List
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's
nextpoints back to a previous node in the ... - Q2.
Convert Binary Tree to Mirror Tree
Convert a given binary tree into its mirror tree, where the left and right children of all non-leaf nodes are interchanged.
Input:
An integer ‘T’ denoting the number o...
(1 Question)
Round duration - 45 Minutes
Round difficulty - Medium
It was technical plus HR round
- Q1.
Matrix Element Cube Sum Problem
For a given M x N sized 2D array 'MATRIX', find and return the value of (i * i + j * j) for elements where the sum of the cubes of its digits equals the element itself. Her...
- Ans.
Find and return the value of (i * i + j * j) for elements in a 2D array where the sum of the cubes of its digits equals the element itself.
Iterate through the 2D array and check if the sum of the cubes of the digits equals the element itself.
Calculate (i * i + j * j) for elements that satisfy the condition.
Return the calculated values as output.
If no element satisfies the condition, return -1.
Interview Preparation Tips
Tip 1 : Good practice of DSA
Tip 2 : Good project(decent one)
Tip 3 : For interviews prepare a little bit about the company you are applying for.
Tip 1 : Add a project in resume.
Tip 2 : Add your top skills and make sure you have knowledge about the things written in your resume.
Skills evaluated in this interview
I applied via Recruitment Consultant and was interviewed in May 2021. There were 4 interview rounds.
Interview Questionnaire
1 Question
- Q1. They almost asked everything about software testing
Interview Preparation Tips
Top trending discussions
Interview questions from similar companies
I applied via Naukri.com and was interviewed before Jul 2019. There were 4 interview rounds.
Interview Questionnaire
3 Questions
- Q1. Questions about the projects you worked with. About how specific coding challenges were solved. How it could have been done other ways. etc.
- Q2. About Python versions and differences. Impact on frameworks.
- Q3. About module design, apis.
Interview Preparation Tips
I applied via Naukri.com and was interviewed before Sep 2020. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. Basic questions they asked.. typically focus on basic concepts.
Interview Preparation Tips
I appeared for an interview before Apr 2021.
(2 Questions)
Round duration - 60 minutes
Round difficulty - Easy
The second round is also written but you need to write programming based on their concept.
- Q1.
Prime Numbers Identification
Given a positive integer
N, your task is to identify all prime numbers less than or equal toN.Explanation:
A prime number is a natural number greater than 1 that has no po...
- Q2.
Palindrome String Validation
Determine if a given string 'S' is a palindrome, considering only alphanumeric characters and ignoring spaces and symbols.
Note:
The string 'S' should be evaluated in a case...
(6 Questions)
Round duration - 60 minutes
Round difficulty - Easy
Technical round with questions mainly on Java and OOPS concepts.
- Q1. What is the difference between static methods and instance methods in Java?
- Ans.
Static methods belong to the class itself, while instance methods belong to individual objects of the class.
Static methods are called using the class name, while instance methods are called using object references.
Static methods cannot access instance variables directly, while instance methods can access both static and instance variables.
Static methods are shared among all instances of the class, while instance method...
- Q2. What is the difference between an abstract class and an interface in Java?
- Q3. What is the difference between ClassNotFoundException and NoClassDefFoundError in Java?
- Ans.
ClassNotFoundException occurs when a class is not found during runtime, while NoClassDefFoundError occurs when a class was found during compilation but not during runtime.
ClassNotFoundException is a checked exception, while NoClassDefFoundError is an Error.
ClassNotFoundException occurs when a class is not found at runtime, usually due to a missing classpath or incorrect class name.
NoClassDefFoundError occurs when a cla...
- Q4. What is the difference between an Error and an Exception in Java?
- Ans.
Error is a serious issue that cannot be handled at runtime, while Exception is a recoverable issue that can be caught and handled.
Error is a subclass of Throwable and is usually caused by the environment or system, such as running out of memory or stack overflow.
Exception is also a subclass of Throwable but is caused by the application code, such as invalid input or file not found.
Errors are unchecked and are not meant...
- Q5. What is SerialVersionUID in Java?
- Ans.
SerialVersionUID is a unique identifier used by Java to ensure the compatibility of serialized objects.
SerialVersionUID is a static final long variable in a class that implements Serializable interface.
It is used to ensure that the serialized object can be deserialized correctly even if the class definition has changed.
If the SerialVersionUID of the serialized object does not match the one in the class, an InvalidClass...
- Q6. What are the requirements for creating an immutable class in Java?
- Ans.
Requirements for creating an immutable class in Java
Make the class final so it cannot be extended
Make all fields private and final
Do not provide setter methods, only getter methods
Ensure that mutable objects are not returned in getter methods
Override equals() and hashCode() methods for proper comparison
Consider making defensive copies of mutable fields in constructor or getter methods
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I appeared for an interview before Apr 2021.
(2 Questions)
Round duration - 90 minutes
Round difficulty - Easy
It was on online objective test consisting of 4 sections: Aptitude, Technical MCQs, Code snippet based MCQs and Coding part.
- Q1.
Valid Parentheses Problem Statement
Given a string 'STR' consisting solely of the characters “{”, “}”, “(”, “)”, “[” and “]”, determine if the parentheses are balanced.
Input:
The first line contains an... - Q2.
Palindrome Linked List Problem Statement
Determine if a given singly linked list of integers is a palindrome. Return
trueif it is a palindrome, otherwise returnfalse.Example:
Input:
1 -> 2 -> ...
- Ans.
Check if a given singly linked list of integers is a palindrome.
Use two pointers to find the middle of the linked list.
Reverse the second half of the linked list.
Compare the first half with the reversed second half to determine if it is a palindrome.
(3 Questions)
Round duration - 60 minutes
Round difficulty - Easy
This was a technical and managerial round. The interviewer gave me a situation where I am in testing team and I found that customer requirement was drop down list at a place but developer has used bullet selection, and is not ready to change it. How will you manage? I gave some good replies and he was convinced.
- Q1. What is a virtual function?
- Q2. Can you explain how to perform a level order traversal of a binary tree in spiral form?
- Q3. What are abstract classes in C++?
- Ans.
Abstract classes in C++ are classes that cannot be instantiated and are designed to be base classes for other classes.
Abstract classes may contain pure virtual functions, making them incomplete and unable to be instantiated.
Derived classes must implement all pure virtual functions from the abstract class in order to be concrete classes.
Abstract classes can have non-virtual functions and member variables like regular cl...
(6 Questions)
Round duration - 60 minutes
Round difficulty - Easy
This was also a technical round. He asked to optimize the code I wrote in coding round. Then he asked me a few puzzles and questions on OOPS, OS and DBMS.
- Q1. Can you explain the ACID properties in the context of database management systems?
- Q2. What is the difference between paging and segmentation in operating systems?
- Ans.
Paging and segmentation are memory management techniques in operating systems.
Paging divides physical memory into fixed-size blocks called pages, while segmentation divides logical memory into variable-size segments.
Paging allows for efficient memory allocation and management, while segmentation provides protection and sharing of memory.
Paging is simpler to implement but can lead to internal fragmentation, while segmen...
- Q3. What is concurrency control?
- Ans.
Concurrency control is a technique used in databases to manage simultaneous access and modification of data by multiple users or processes.
Concurrency control ensures that transactions are executed in a way that maintains data consistency and integrity.
Techniques like locking, timestamp ordering, and optimistic concurrency control are used to implement concurrency control.
For example, in a banking system, concurrency c...
- Q4. What is the difference between String Buffer and String Builder in Java?
- Ans.
String Buffer is synchronized and thread-safe, while String Builder is not synchronized and faster.
String Buffer is synchronized, making it thread-safe for use in multi-threaded environments.
String Builder is not synchronized, resulting in faster performance but not thread-safe.
String Builder is preferred for single-threaded operations, while String Buffer is preferred for multi-threaded operations.
- Q5. What are smart pointers in C++?
- Ans.
Smart pointers in C++ are objects that act like pointers but provide automatic memory management.
Smart pointers help prevent memory leaks by automatically managing memory allocation and deallocation.
Examples include unique_ptr, shared_ptr, and weak_ptr.
unique_ptr is used for exclusive ownership, shared_ptr for shared ownership, and weak_ptr to prevent circular references.
- Q6. What is the difference between a mutex and a semaphore?
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I applied via Company Website and was interviewed before May 2018. There were 3 interview rounds.
Interview Questionnaire
2 Questions
- Q1. Questions about Oops, data structures based on the projects I had done, and my resume
- Q2. Questions about classes and abstraction
Interview Preparation Tips
Shubham Jain
Interview Questionnaire
3 Questions
- Q1. Write a program for snake traversal of binary tree
- Ans.
Program for snake traversal of binary tree
Use a stack to keep track of nodes to be visited
Start with the root node and push it onto the stack
While the stack is not empty, pop a node and print its value
If the level is even, push the left child first and then the right child onto the stack
If the level is odd, push the right child first and then the left child onto the stack
- Q2. To write code to check linked list is palindrome or not, in a single traversal and without using any other data structure
- Q3. Asked about OOPS concepts like abstraction, encapsulation, inheritance and polymorphism in detail and how they are implemented while programming
Interview Preparation Tips
Experience: It was on online objective test consisting of 4 sections: Aptitude, Technical MCQs, Code snippet based MCQs and Coding part.
Coding part had questions like balanced parenthesis check, etc.
Round: Technical Interview
Experience: Technical and managerial. Gave me a situation where I am in testing team and I found that customer requirement was drop down list at a place but developer has used bullet selection, and is not ready to change it. How will you manage? I gave some good replies and he was convinced.
Then he asked 25 horses puzzle (-----.php/puzzles/25-horses-3-fastest-5-races-puzzle/). I solved it.
He then asked me to code it. I wrote an algorithm first and then the code. He was very impressed.
He asked about virtual functions, abstract classes, pure virtual functions.
Round: Technical Interview
Experience: He asked to optimize the code I wrote in coding round.
Then he asked me candle puzzle on how to measure 30 min and 45 min.
Then he asked me the chocolate puzzle (-----.html).
What is paging and segmentation?
What are ACID properties in DBMS?
What is transaction and how is concurrency control done?
What is the difference between string builder and string buffer?
What is string pool in java?
What is JVM, JRE, JDK?
Differentiate between mutex and semaphore?
Can you override private and static members?
Contiguous and non-contiguous memory allocation?
What are Smart pointers?
Skills:
College Name: NIT Jalandhar
Skills evaluated in this interview
42Gears Mobility Systems Interview FAQs
The duration of 42Gears Mobility Systems interview process can vary, but typically it takes about less than 2 weeks to complete.
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Overall Interview Experience Rating
based on 2 interview experiences
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42Gears Mobility Systems Reviews and Ratings
based on 116 reviews
Rating in categories
|
Software Engineer
45
salaries
|  ₹4.2 L/yr - ₹11 L/yr |
|
Member Technical Staff
39
salaries
| ₹5.3 L/yr - ₹12.9 L/yr |
|
Technical Support Engineer
32
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| ₹6.9 L/yr - ₹12.2 L/yr |
|
Softwaretest Engineer
25
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| ₹2.5 L/yr - ₹7.5 L/yr |
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| ₹3.2 L/yr - ₹8 L/yr |
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