Ultimate Mongodb Test - 78+ MCQs: MongoDB test: Assess Your Knowledge with MongoDB Questions and Answers

1. What is the purpose of the `ttl` index type in MongoDB?

To store timestamps

To perform text search

To create a time-to-live index

To encrypt data

2. What is the purpose of the `explain()` method in MongoDB?

To provide documentation for queries

To analyze and report on the query execution plan

To debug MongoDB server issues

To format query results

3. How can you perform a multi-field sort in MongoDB?

db.sort()

db.orderBy()

db.sortBy()

db.find().sort()

4. What is sharding in MongoDB?

The process of encrypting data

The process of splitting data across multiple servers

The process of sorting documents in a collection

The process of updating MongoDB version

5. What does NoSQL stand for in the context of databases?

Not Only SQL

Nonlinear Structured Query Language

Network Object Storage Language

Nested Object-Specific Query Language

6. What is the purpose of the `db.currentOp()` method in MongoDB?

To create a new operation

To retrieve information about current operations

To update an existing operation

To terminate an operation

7. Which command is used to create a new database in MongoDB?

db.makeDatabase()

db.new()

db.createDatabase()

use <databaseName>

8. In MongoDB, what is the purpose of the `explain()` method?

To provide documentation for queries

To analyze and report on the query execution plan

To debug MongoDB server issues

To format query results

9. What is the role of the WiredTiger storage engine in MongoDB?

Data encryption

Query optimization

Journaling

Storage and retrieval of data

10. How does MongoDB handle data consistency in a distributed environment?

Eventual consistency

Data compression

Data validation

Immediate consistency

11. Explain the concept of readConcern in MongoDB and its impact on data consistency.

Concurrency control

Data validation

Read operations

Query optimization

12. What is the purpose of the `$elemMatch` operator in MongoDB?

Matches arrays with a specific element

Matches arrays with all specified elements

Matches arrays without a specific element

Matches arrays based on position

13. Which operator is used for equality in MongoDB queries?

$eq

$equals

$eqs

$equal

14. Explain the significance of the ObjectId in MongoDB documents.

Primary key

Timestamp

Foreign key

Random identifier

15. How does MongoDB handle transactions, and what types of operations support transactions?

Concurrency control

Data validation

Data modeling

Atomic operations

16. Which command is used to remove a document from a collection in MongoDB?

db.erase()

db.remove()

db.delete()

db.drop()

17. What is the purpose of the explain() method in MongoDB?

Data retrieval details

Data encryption

Data compression

Data validation

18. What is a sharded cluster in MongoDB, and why might it be used?

Replication mechanism

Distributed database

Security layer

Indexing strategy

19. How can you limit the number of documents returned in a MongoDB query?

db.limit()

db.count()

db.find().limit()

db.max()

20. What is the purpose of the `text` index type in MongoDB?

To store text data in a compressed format

To perform text search on string content

To encrypt text fields

To create a case-insensitive index

21. In MongoDB, what is the primary role of the `mongos` process?

Client application for MongoDB

MongoDB database server

Query optimizer

Shard router in a sharded cluster

22. In MongoDB, what is the role of the WiredTiger storage engine?

Query optimization

Concurrency control

Data compression

Authentication

23. What does the term 'Atlas' refer to in MongoDB?

A type of data structure

MongoDB's cloud database service

A query optimization technique

A high-performance storage engine

24. Explain the purpose of the $lookup stage in the MongoDB aggregation pipeline.

Data enrichment

Data transformation

Data validation

Data modeling

25. Explain the concept of sharding in MongoDB and when it is beneficial.

Data modeling

Horizontal scaling

Data encryption

Concurrency control

26. In MongoDB, what does the `dbStats()` command provide?

Statistics about a specific collection

Statistics about a specific document

Statistics about the entire database

Statistics about index usage

27. What is a covered query in MongoDB?

A query with optimal indexing

A query that retrieves only the indexed fields

A query with multiple conditions

A query that covers all documents in a collection

28. What is the syntax for creating an ascending index on a field in MongoDB?

db.index({ field: 1 })

db.createIndex({ field: 'asc' })

db.ensureIndex({ field: 'ascending' })

db.field.createIndex()

29. How can you update a document in MongoDB?

db.modify()

db.update()

db.edit()

db.change()

30. What is the significance of the GridFS in MongoDB?

Data compression

Large file storage

Authentication

Query optimization

31. In MongoDB, how do you create a compound index?

db.createIndex({ field1: 1, field2: 1 })

db.index({ field1: 'asc', field2: 'desc' })

db.ensureIndex({ field1: 'ascending', field2: 'descending' })

db.field1.field2.createIndex()

32. What is the role of the Mongoose library in MongoDB?

Database administration

Object modeling

Query optimization

Authentication

33. What is the purpose of the `aggregate()` method in MongoDB?

To create pipelines for data processing

To perform sorting on a collection

To insert documents into a collection

To update multiple documents simultaneously

34. What does the term 'BSON' stand for in MongoDB?

Binary Structured Object Notation

Basic Structured Object Notation

Boolean Structured Object Notation

Binary System Object Notation

35. Which authentication mechanism is commonly used in MongoDB?

OAuth

JWT

Kerberos

SCRAM-SHA-256

36. What is the purpose of the `db.createView()` method in MongoDB?

To create a new database

To create a new collection

To create a view on an existing collection

To create an index on a collection

37. Which aggregation stage is used to group documents by a specific field?

$group

$sort

$match

$project

38. What is the purpose of the `$in` operator in MongoDB?

Matches values not in a specified array

Matches values in a specified array

Negates the results of an aggregation stage

Selects documents with a not-in condition

39. What is the purpose of the $redact stage in MongoDB aggregation?

Data transformation

Data security

Data validation

Query optimization

40. What is the primary purpose of MongoDB?

Relational Database Management

Document-Oriented Database Management

Graph Database Management

Key-Value Pair Database Management

MongoDB MCQ Test 2