Philips Data Science Intern Interview Questions and Answers

Q1. Normal questions about academics and small projects
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Q1. Explain your academic projects.
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There were 4 sections and first one was quant, second one was logical, third was English and finally 3 coding questions in last section

4 codes and 5 technical questions

Q1. Explain multi threading
Ans. 
Multi threading is the ability of a CPU to execute multiple threads concurrently.
• Allows for parallel execution of tasks, improving performance

• Each thread has its own stack and runs independently

• Threads can communicate and synchronize using shared memory

• Examples: running multiple tasks simultaneously in a web server, processing data in parallel
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Q2. What is polymorphism
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Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types.

• Examples include method overloading and method overriding in object-oriented programming.
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Q3. Diff b/w inner and outer joins
Ans. 
Inner join returns only the rows that have matching values in both tables, while outer join returns all rows from both tables.
• Inner join: returns rows with matching values in both tables

• Outer join: returns all rows from both tables, with NULL values where there is no match

• Example: Inner join - SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id

• Example: Outer join - SELECT * FROM table1 LEFT OUTER JOIN table
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Q1. Probability of bit error in a binary symmetric channel
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The probability of bit error in a binary symmetric channel can be calculated using the formula P = 1/2 * erfc(sqrt(Eb/N0)), where erfc is the complementary error function.
• Probability of bit error in a binary symmetric channel is influenced by the signal-to-noise ratio (Eb/N0).

• The error function erfc is used to calculate the probability of bit error.

• The formula for calculating the probability of bit error is P = 1/2 * e
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Binary tree traversal question

Q1. Linklist simple question
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Q2. Add node at nth position
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To add a node at the nth position in a linked list
• Create a new node with the data to be inserted

• Traverse the linked list to the (n-1)th node

• Adjust the pointers to insert the new node at the nth position
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Q1. What are your skills
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Q2. What are your strengths
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Q3. What are your weaknesses
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Q4. Do you have any machine learning experience
Ans. 
Yes, I have experience with machine learning through coursework and personal projects.
• Completed coursework in machine learning algorithms

• Developed a recommendation system using collaborative filtering

• Utilized neural networks for image classification tasks
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Q5. Tell me about yourself
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It was a combination of Maths and Electronics basics.

Q1. Introduce yourself?
Ans. 
I am a recent graduate with a degree in Computer Science and a passion for coding and problem-solving.
• Recent graduate with a degree in Computer Science

• Passionate about coding and problem-solving

• Strong communication and teamwork skills
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Q2. Tell me about your projects?
Ans. 
I have worked on various projects including a web development project, a data analysis project, and a machine learning project.
• Developed a website for a local business using HTML, CSS, and JavaScript.

• Conducted data analysis on customer feedback data to identify trends and make recommendations for improvement.

• Implemented a machine learning algorithm to predict customer churn for a telecom company.
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