Qualcomm Engineer Interview Questions and Answers

Q1. Mostly on C, OS and wireless comm fundamentals.
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Q2. What does malloc return?
Ans. 
malloc returns a pointer to a block of memory allocated from the heap.
• malloc returns a void pointer (void*)

• The returned pointer can be cast to the desired data type

• If malloc fails to allocate memory, it returns NULL
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Q3. What is RTOS and how does it differ from OS?
Ans. 
RTOS stands for Real-Time Operating System. It is designed to handle time-sensitive tasks and provide deterministic behavior.
• RTOS is optimized for real-time applications that require precise timing and responsiveness.

• Unlike general-purpose operating systems, RTOS provides deterministic behavior, meaning tasks are guaranteed to be completed within a specific time frame.

• RTOS typically uses priority-based scheduling algor...read more
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Q4. Why not to use malloc?
Ans. 
malloc should be avoided due to potential memory leaks and security vulnerabilities.
• malloc does not initialize memory, leading to potential bugs and crashes.

• It does not provide any bounds checking, leading to buffer overflows.

• Memory allocated with malloc must be explicitly freed with free() to avoid memory leaks.

• Using malloc can be less efficient than using stack memory for small allocations.

• Alternatives like calloc() ...read more
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Q5. What happens at stack/memory level when a null ptr is dereferenced?
Ans. 
When a null pointer is dereferenced, it leads to a segmentation fault or access violation, causing the program to crash.
• Dereferencing a null pointer means trying to access the memory location pointed by the null pointer.

• This results in a segmentation fault or access violation, as the null pointer does not point to a valid memory address.

• The operating system detects the illegal memory access and terminates the program t...read more
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Q1. OOPs Concepts: Abstraction, Encapsulation, Inheritance , Polymorphism
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Q2. Count number of elements in an array in python.
Ans. 
Use len() function to count number of elements in an array in Python.
• Use len() function with the array as argument to get the count of elements.

• Example: array = ['apple', 'banana', 'cherry'] Count = len(array) # Output: 3
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Q3. Merge two arrays in sorted order.
Ans. 
Merge two sorted arrays nums1 and nums2 into nums1 in-place.
• Initialize pointers for nums1 and nums2 at the end of their elements

• Compare elements pointed by the two pointers and place larger element at end of nums1

• Repeat until all elements from nums2 have been merged into nums1
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Q4. Difference between list and tuple
Ans. 
List is mutable, tuple is immutable in Python.
• List can be modified after creation, tuple cannot.

• List is defined using square brackets [], tuple using parentheses ().

• List is used for collections of items that may change, tuple for fixed collections.

• Example: list_example = [1, 2, 3], tuple_example = (4, 5, 6)
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Q5. One regex question and one file handling question in python
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Psuedo code of binary search. and some OOPs concept.

Q1. XR Related questions , OOPS programming
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Q2. Coding questions
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Q3. Problem solving
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Q1. Os , dbms, coding qs
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Q1. C,c++,c os questions
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Q1. Project, coding qs
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Q1. Bit manupulation
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Q2. Projects done in previous company
Ans. 
Led multiple engineering projects focusing on automation, efficiency, and innovative solutions in my previous company.
• Developed an automated testing framework that reduced testing time by 30%.

• Implemented a new data management system that improved data retrieval speed by 50%.

• Collaborated with cross-functional teams to design a new product line, resulting in a 20% increase in market share.

• Optimized existing manufacturing...read more
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Reverse a LinkedIn list

Difference between Structure vs union

Q1. Salary expectation
Ans. 
I expect a competitive salary based on my skills, experience, and industry standards.
• Research industry standards: For example, engineers in my field typically earn between $70,000 and $90,000 annually.

• Consider my experience: With 5 years in the industry, I believe a salary in the upper range is justified.

• Location matters: Salaries can vary significantly by region; for instance, positions in tech hubs often offer higher...read more
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Q2. Tell me about yourself
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