Top 25 MongoDB Interview Questions and Answers for 2025.

By Jitendra kumar

MongoDB Intermediate Interview Questions explore advanced concepts and features, such as schema design, aggregation pipelines, indexing and indexing best practices for fast, scalable data access.

Q1: Which of the following is NOT a type of NoSQL database?

Q2: What is the primary key in MongoDB called?

Q3: Which command is used to insert a single document into a MongoDB collection?

Q4: What is the purpose of indexing in MongoDB?

Q5: Which operator is used to perform a text search in MongoDB?

Q6: Which command is used to create an index in MongoDB?

Q7: What is the purpose of the aggregation pipeline in MongoDB?

Q8: Which stage in the aggregation pipeline is used to group documents?

Q9: Which operator is used to specify a range of values in a query?

Q10: What is sharding in MongoDB?

Q11: What is a replica set in MongoDB?

Q12: Which of the following is a valid data type in MongoDB?

Q13: What is the purpose of the `$lookup` operator in MongoDB?

Q14: Which of the following is NOT a valid update operator in MongoDB?

Q15: What does ACID stand for in database terms?

Q16: What is the purpose of the oplog in MongoDB?

Q17: Which isolation level does MongoDB use by default?

Q18: What is the difference between `updateOne` and `updateMany`?

Q19: What is a capped collection in MongoDB?

Q20: What is GridFS used for in MongoDB?

Q21: How can you ensure data consistency in a distributed MongoDB environment?

Q22: What is the purpose of the `$facet` stage in an aggregation pipeline?

Q23: What is the benefit of using covered queries in MongoDB?

Q24: Which query operator checks if a field exists in a document?

Q25: How do you handle relationships between documents in MongoDB?

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