MongoDB interview questions

18 MongoDB questions from the NoSQL bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.

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1. What is Collection?

Junior
  1. A.a grouping of documents that plays the role a table does in a relational database
  2. B.a single index built over several fields whose ordering determines which query prefixes it can satisfy
  3. C.a sequence of stages such as match, group, and project that transforms documents step by step
  4. D.the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals

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2. Which term means: "a grouping of documents that plays the role a table does in a relational database"?

Junior
  1. A._id
  2. B.Aggregation pipeline
  3. C.BSON
  4. D.Collection

Answer + AI explanation with Pro

3. Which statement is correct?

Junior
  1. A.Collection — the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals
  2. B.Collection — a single index built over several fields whose ordering determines which query prefixes it can satisfy
  3. C.Collection — a grouping of documents that plays the role a table does in a relational database
  4. D.Collection — the mandatory unique primary-key field automatically added to every document, defaulting to an ObjectId

Answer + AI explanation with Pro

4. What is Document?

Junior
  1. A.a grouping of documents that plays the role a table does in a relational database
  2. B.the mandatory unique primary-key field automatically added to every document, defaulting to an ObjectId
  3. C.a single index built over several fields whose ordering determines which query prefixes it can satisfy
  4. D.a single record stored as a set of field-and-value pairs in a flexible nested structure

Answer + AI explanation with Pro

5. Which term means: "a single record stored as a set of field-and-value pairs in a flexible nested structure"?

Junior
  1. A._id
  2. B.Document
  3. C.BSON
  4. D.Collection

Answer + AI explanation with Pro

6. Which statement is correct?

Junior
  1. A.Document — a single record stored as a set of field-and-value pairs in a flexible nested structure
  2. B.Document — a single index built over several fields whose ordering determines which query prefixes it can satisfy
  3. C.Document — a sequence of stages such as match, group, and project that transforms documents step by step
  4. D.Document — the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals

Answer + AI explanation with Pro

7. What is BSON?

Mid
  1. A.a single record stored as a set of field-and-value pairs in a flexible nested structure
  2. B.a sequence of stages such as match, group, and project that transforms documents step by step
  3. C.the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals
  4. D.a grouping of documents that plays the role a table does in a relational database

Answer + AI explanation with Pro

8. Which term means: "the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals"?

Mid
  1. A.Compound index
  2. B.BSON
  3. C._id
  4. D.Document

Answer + AI explanation with Pro

9. Which statement is correct?

Mid
  1. A.BSON — a single record stored as a set of field-and-value pairs in a flexible nested structure
  2. B.BSON — a sequence of stages such as match, group, and project that transforms documents step by step
  3. C.BSON — a single index built over several fields whose ordering determines which query prefixes it can satisfy
  4. D.BSON — the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals

Answer + AI explanation with Pro

10. What is Aggregation pipeline?

Mid
  1. A.a sequence of stages such as match, group, and project that transforms documents step by step
  2. B.a grouping of documents that plays the role a table does in a relational database
  3. C.a single record stored as a set of field-and-value pairs in a flexible nested structure
  4. D.the mandatory unique primary-key field automatically added to every document, defaulting to an ObjectId

Answer + AI explanation with Pro

11. Which term means: "a sequence of stages such as match, group, and project that transforms documents step by step"?

Mid
  1. A.Document
  2. B.Compound index
  3. C.BSON
  4. D.Aggregation pipeline

Answer + AI explanation with Pro

12. Which statement is correct?

Mid
  1. A.Aggregation pipeline — the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals
  2. B.Aggregation pipeline — a single record stored as a set of field-and-value pairs in a flexible nested structure
  3. C.Aggregation pipeline — a sequence of stages such as match, group, and project that transforms documents step by step
  4. D.Aggregation pipeline — a single index built over several fields whose ordering determines which query prefixes it can satisfy

Answer + AI explanation with Pro

13. What is _id?

Junior
  1. A.a grouping of documents that plays the role a table does in a relational database
  2. B.the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals
  3. C.a single index built over several fields whose ordering determines which query prefixes it can satisfy
  4. D.the mandatory unique primary-key field automatically added to every document, defaulting to an ObjectId

Answer + AI explanation with Pro

14. Which term means: "the mandatory unique primary-key field automatically added to every document, defaulting to an ObjectId"?

Junior
  1. A._id
  2. B.Collection
  3. C.Document
  4. D.BSON

Answer + AI explanation with Pro

15. Which statement is correct?

Junior
  1. A._id — the mandatory unique primary-key field automatically added to every document, defaulting to an ObjectId
  2. B._id — a single record stored as a set of field-and-value pairs in a flexible nested structure
  3. C._id — a single index built over several fields whose ordering determines which query prefixes it can satisfy
  4. D._id — the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals

Answer + AI explanation with Pro

16. What is Compound index?

Senior
  1. A.a single index built over several fields whose ordering determines which query prefixes it can satisfy
  2. B.a single record stored as a set of field-and-value pairs in a flexible nested structure
  3. C.the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals
  4. D.a grouping of documents that plays the role a table does in a relational database

Answer + AI explanation with Pro

17. Which term means: "a single index built over several fields whose ordering determines which query prefixes it can satisfy"?

Senior
  1. A.Compound index
  2. B._id
  3. C.BSON
  4. D.Collection

Answer + AI explanation with Pro

18. Which statement is correct?

Senior
  1. A.Compound index — a single index built over several fields whose ordering determines which query prefixes it can satisfy
  2. B.Compound index — the binary-encoded superset of JSON that MongoDB uses on disk and over the wire, adding types like dates and 128-bit decimals
  3. C.Compound index — a sequence of stages such as match, group, and project that transforms documents step by step
  4. D.Compound index — a grouping of documents that plays the role a table does in a relational database

Answer + AI explanation with Pro

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