MongoDB MCQs – Introduction to MongoDB

11.) What type of model does MongoDB use for data representation?

A) Document
B) Tabular
C) Object
D) Columnar

Answer: Option A

Explanation: MongoDB is a document-oriented database, where data is stored in flexible, self-contained documents (typically in BSON format).

12.) Which of the following is a NoSQL feature of MongoDB?

A) Table joins
B) ACID transactions
C) Flexible schema design
D) Fixed relationships

Answer: Option C

Explanation: MongoDB allows for flexible, schema-less design, meaning documents in the same collection can have different fields and data types.

13.) Which of the following is NOT a key advantage of MongoDB?

A) Horizontal scaling
B) Fixed schema
C) High availability
D) Schema flexibility

Answer: Option B

Explanation: MongoDB is known for its schema flexibility, which allows different structures within the same collection. Fixed schema is a characteristic of relational databases, not MongoDB.

14.) In MongoDB, what is used to represent a single record of data?

A) Document
B) Table
C) Row
D) Tuple

Answer: Option A

Explanation: A MongoDB document is equivalent to a row in a relational database, representing a single data record.

15.) Which of the following is the correct command to create a new MongoDB database?

A) createDatabase()
B) b.create()
C) use database_name
D) createDB()

Answer: Option C

Explanation: The use command is used to create or switch to a database in MongoDB.

16.) In MongoDB, which of the following is used for client-side interaction with the database?

A) MongoDB Compass
B) mongodump
C) mongod
D) mongo shell

Answer: Option D

Explanation: The mongo shell is a command-line tool used to interact with the MongoDB database, run queries, and perform administrative operations.

17.) Which feature does MongoDB offer to ensure data redundancy and high availability?

A) Sharding
B) Replica sets
C) Full-text search
D) Column indexing

Answer: Option B

Explanation: MongoDB replica sets provide data redundancy and high availability by replicating data across multiple nodes.

18.) Which of the following MongoDB operations is used to update an existing document?

A) db.collection.update()
B) db.collection.insert()
C) db.collection.find()
D) db.collection.delete()

Answer: Option A

Explanation: The update() operation is used to modify existing documents in a MongoDB collection.

19.) Which feature of MongoDB is responsible for distributing data across multiple servers?

A) Indexing
B) Aggregation
C) Sharding
D) Transactions

Answer: Option C

Explanation: Sharding in MongoDB allows data to be distributed across multiple servers, ensuring scalability and efficient handling of large datasets.

20.) Which of the following commands is used to drop a database in MongoDB?

A) db.drop()
B) db.dropDatabase()
C) dropDatabase()
D) db.deleteDatabase()

Answer: Option B

Explanation: The dropDatabase() command is used to delete an existing database in MongoDB.

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