BT Group Intern Interview Questions and Answers for Freshers

Q1. Tell me about yourself
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Q2. Why do you want to join this company
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Q1. It was a online coding round with one question related to a medium hard binary search question..
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Q2. The second question was bit ambiguous question involving a tree, where we were asked to add a tree child and subchild in the form a a directory and subdirectory
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Q1. Use of Hash Table
Ans. 
Hash tables are data structures that store key-value pairs for efficient retrieval.
• Hash tables use a hash function to map keys to indexes in an array.

• They have constant time complexity for insertion, deletion, and lookup operations.

• Collisions can occur when multiple keys hash to the same index, which can be resolved using techniques like chaining or open addressing.
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English communication test

Q1. What is garbage collection?
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Garbage collection is an automatic memory management process that frees up memory occupied by objects that are no longer in use.
• Garbage collection is a process of identifying and freeing up memory that is no longer in use by the program.

• It helps prevent memory leaks and improves program performance.

• Examples of garbage collection include Java's automatic garbage collection and Python's reference counting and garbage col...read more
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Q2. Difference between foreign key and primary key
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Primary key uniquely identifies a record in a table, while foreign key refers to a field in another table.
• Primary key is used to enforce data integrity and ensure uniqueness of records.

• Foreign key is used to establish a relationship between two tables.

• A table can have only one primary key, while it can have multiple foreign keys.

• Primary key is always indexed, while foreign key may or may not be indexed.

• Example: In a da...read more
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Q3. One coding question about trees
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Aptitude was online and was not that tough

Q1. Osi modle ,opps concept ,TCP,UDP,
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The test had 3 sections involving aptitude , english , critical thinking

Q1. Question on basics of pyhton
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Q2. Question on basics of dsa
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