240+ MongoDB MCQ With Online Practice Test

MongoDB is a popular NoSQL database system renowned for its flexibility and scalability. It uses a document-oriented model, storing data in JSON-like BSON format, allowing for dynamic schemas and easy data manipulation. MongoDB's distributed architecture supports horizontal scaling, ensuring high availability and performance. It's widely utilized for applications requiring real-time data access and complex data structures. Its features include automatic sharding, replication, and support for geospatial data, making it a versatile choice for a broad range of industries, from e-commerce and social media to IoT and big data analytics.

Practice Test

51. What is the primary purpose of the MongoDB Aggregation Framework?

Answer: Data retrieval

52. Which operation is used to group documents by a specific field in MongoDB Aggregation?

Answer: $group

53. Which MongoDB Aggregation operator is used to filter documents in the Aggregation pipeline?

Answer: $match

54. What does the $project operator do in MongoDB Aggregation?

Answer: Transforms data

55. In the MongoDB Aggregation Framework, what does the $unwind operator do?

Answer: Splits array fields

56. What is the purpose of the $sort operator in MongoDB Aggregation?

Answer: Sorting documents

57. Which operator is used to limit the number of documents returned in the MongoDB Aggregation result?

Answer: $limit

58. What is the $lookup operator used for in MongoDB Aggregation?

Answer: Joining data

59. Which Aggregation operator is used to calculate the average of numeric values in MongoDB?

Answer: $avg

60. How can you specify the order in which the Aggregation stages are executed in MongoDB?

Answer: Stages are executed in a fixed order
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