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MongoEngine MCQs and Answers with Explanation: MongoEngine is a Python object-document mapper (ODM) library for working with MongoDB databases. It provides a high-level, object-oriented interface for interacting with MongoDB, allowing developers to use familiar programming constructs like classes, inheritance, and objects to work with their data. Further, to help you test your understanding of MongoEngine, we have accommodated the Top 25 MongoEngine Multiple Choice Questions that enable you to learn the MongoEngine concept easily.
MongoEngine MCQs with Answers
MongoEngine simplifies the process of working with MongoDB by abstracting away many of the low-level details of the database, while still providing developers with powerful features and flexible querying capabilities. With MongoEngine, developers can quickly create and manage data models, perform advanced queries, and easily integrate with other Python frameworks and libraries. Now without any further delay move on to the next sections and get the MongoEngine MCQ Questions/ MongoEngine Quiz along with an explanation for each question to be well prepared for the interview or placement exam.
MongoEngine Multiple Choice Questions
| Name | MongoEngine |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 25 MongoEngine MCQ Questions & Answers | MongoEngine Quiz
1. What is MongoEngine?
a) A Python Object-Document-Mapper for working with MongoDB
b) A web framework for building web application
c) A database management system
d) A programming language
Answer: a) A Python Object-Document-Mapper for working with MongoDB
Explanation: MongoEngine is a Python Object-Document-Mapper (ODM) that provides a high-level API for working with MongoDB in Python.
2. Which of the following is true about MongoDB?
a) MongoDB is a SQL-based database management system
b) MongoDB is a NoSQL database management system
c) MongoDB is a relational database management system
d) MongoDB is a file-based database management system
Answer: b) MongoDB is a NoSQL database management system
Explanation: MongoDB is a NoSQL database management system that stores data in JSON-like documents.
3. How do you connect to a MongoDB database using MongoEngine?
a) MongoClient()
b) connect()
c) create_engine()
d) engine()
Answer: b) connect()
Explanation: You can connect to a MongoDB database using MongoEngine by calling the connect() method with the appropriate parameters.
4. What is the difference between a Document and a EmbeddedDocument in MongoEngine?
a) Documents are stored in separate collections, while EmbeddedDocuments are stored within Documents.
b) Documents can be indexed, while EmbeddedDocuments cannot.
c) Documents can be updated independently of their containing Document, while EmbeddedDocuments cannot.
d) EmbeddedDocuments can be referenced from other Documents, while Documents cannot.
Answer: a) Documents are stored in separate collections, while EmbeddedDocuments are stored within Documents.
Explanation: Documents are top-level objects in MongoEngine that are stored in separate collections, while EmbeddedDocuments are objects that are embedded within Documents and are stored within the Document.
5. What is the syntax for defining a Document class in MongoEngine?
a) class MyDocument(Document):
b) class MyDocument(models.Document):
c) class MyDocument(db.Document):
d) class MyDocument(mongoengine.Document):
Answer: d) class MyDocument(mongoengine.Document):
Explanation: The syntax for defining a Document class in MongoEngine is to inherit from the mongoengine.Document class.
6. Which of the following is true about the StringField in MongoEngine?
a) It can only store alphanumeric characters
b) It can store any type of data
c) It can store Unicode characters
d) It can store integers and floats
Answer: c) It can store Unicode characters
Explanation: The StringField in MongoEngine can store Unicode characters, which includes alphanumeric characters.
7. What is the difference between the ListField and the EmbeddedDocumentField in MongoEngine?
a) The ListField stores a list of simple data types, while the EmbeddedDocumentField stores a list of complex objects.
b) The ListField stores a list of complex objects, while the EmbeddedDocumentField stores a list of simple data types.
c) The ListField stores a list of Strings, while the EmbeddedDocumentField stores a list of Integers.
d) The ListField and the EmbeddedDocumentField are identical.
Answer: a) The ListField stores a list of simple data types, while the EmbeddedDocumentField stores a list of complex objects.
Explanation: The ListField in MongoEngine stores a list of simple data types, such as strings or integers, while the EmbeddedDocumentField stores a list of complex objects, such as EmbeddedDocuments.
8. What is the syntax for adding a field to a MongoEngine Document class?
a) field_name = mongoengine.StringField()
b) field_name = StringField()
c) field_name = db.StringField()
d) field_name = models.StringField()
Answer: b) field_name = StringField()
Explanation: The syntax for adding a field to a MongoEngine Document class is to define the field name and the field type within the class definition, as in field_name = StringField().
9. What is the purpose of the ReferenceField in MongoEngine?
a) To store a reference to another Document in the same collection
b) To store a reference to another Document in a different collection
c) To store a reference to an EmbeddedDocument within the same Document
d) To store a reference to a ListField within the same Document
Answer: b) To store a reference to another Document in a different collection
Explanation: The ReferenceField in MongoEngine is used to store a reference to another Document in a different collection.
10. Which of the following is true about the DynamicField in MongoEngine?
a) It can store any type of data
b) It can only store strings
c) It can store integers and floats
d) It is not supported in MongoEngine
Answer: a) It can store any type of data
Explanation: The DynamicField in MongoEngine can store any type of data.
11. What is the syntax for defining a OneToOneField in MongoEngine?
a) field_name = mongoengine.OneToOneField(OtherDocument)
b) field_name = OneToOneField(OtherDocument)
c) field_name = db.OneToOneField(OtherDocument)
d) field_name = models.OneToOneField(OtherDocument)
Answer: a) field_name = mongoengine.OneToOneField(OtherDocument)
Explanation: The syntax for defining a OneToOneField in MongoEngine is to use the mongoengine.OneToOneField class and pass in the related Document as an argument.
12. What is the purpose of the GenericReferenceField in MongoEngine?
a) To store a reference to any type of Document in any collection
b) To store a reference to any type of EmbeddedDocument within the same Document
c) To store a reference to any type of ListField within the same Document
d) To store a reference to any type of StringField within the same Document
Answer: a) To store a reference to any type of Document in any collection
Explanation: The GenericReferenceField in MongoEngine is used to store a reference to any type of Document in any collection.
13. What is the purpose of the BinaryField in MongoEngine?
a) To store binary data, such as images or files
b) To store strings
c) To store integers and floats
d) To store boolean values
Answer: a) To store binary data, such as images or files
Explanation: The BinaryField in MongoEngine is used to store binary data, such as images or files.
14. What is the syntax for adding a required field to a MongoEngine Document class?
a) field_name = StringField(required=True)
b) field_name = mongoengine.StringField(required=True)
c) field_name = models.StringField(required=True)
d) field_name = db.StringField(required=True)
Answer: a) field_name = StringField(required=True)
Explanation: The syntax for adding a required field to a MongoEngine Document class is to pass the argument required=True when defining the field.
15. What is the purpose of the MapField in MongoEngine?
a) To store a dictionary of key-value pairs
b) To store a list of dictionaries
c) To store a list of key-value pairs
d) To store a dictionary of lists
Answer: a) To store a dictionary of key-value pairs
Explanation: The MapField in MongoEngine is used to store a dictionary of key-value pairs.
16. What is the purpose of the DecimalField in MongoEngine?
a) To store strings
b) To store integers and floats
c) To store decimal numbers with precision and scale
d) To store boolean values
Answer: c) To store decimal numbers with precision and scale
Explanation: The DecimalField in MongoEngine is used to store decimal numbers with precision and scale, rather than using floating-point numbers which can result in rounding errors.
17. What is the syntax for adding a default value to a MongoEngine field?
a) field_name = StringField(default=’default_value’)
b) field_name = mongoengine.StringField(default=’default_value’)
c) field_name = db.StringField(default=’default_value’)
d) field_name = models.StringField(default=’default_value’)
Answer: a) field_name = StringField(default=’default_value’)
Explanation: The syntax for adding a default value to a MongoEngine field is to pass the argument default=’default_value’ when defining the field.
18. What is the purpose of the GeoPointField in MongoEngine?
a) To store a point in space using latitude and longitude coordinates
b) To store a list of points in space
c) To store a polygon in space using latitude and longitude coordinates
d) To store a list of polygons in space
Answer: a) To store a point in space using latitude and longitude coordinates
Explanation: The GeoPointField in MongoEngine is used to store a point in space using latitude and longitude coordinates.
19. What is the purpose of the DynamicDocument class in MongoEngine?
a) To allow for flexible, dynamic schema design
b) To provide a base class for all MongoEngine Documents
c) To allow for easy creation of EmbeddedDocuments
d) To provide a base class for all MongoEngine EmbeddedDocuments
Answer: a) To allow for flexible, dynamic schema design
Explanation: The DynamicDocument class in MongoEngine is used to allow for flexible, dynamic schema design by allowing fields to be added or removed at runtime.
20. What is the purpose of the EmbeddedDocumentListField in MongoEngine?
a) To store a list of EmbeddedDocuments within the same Document
b) To store a list of Documents within the same collection
c) To store a list of key-value pairs
d) To store a list of dictionaries
Answer: a) To store a list of EmbeddedDocuments within the same Document
Explanation: The EmbeddedDocumentListField in MongoEngine is used to store a list of EmbeddedDocuments within the same Document.
21. What is the syntax for adding a validation rule to a MongoEngine field?
a) field_name = StringField(validation=validator_function)
b) field_name = mongoengine.StringField(validation=validator_function)
c) field_name = db.StringField(validation=validator_function)
d) field_name = models.StringField(validation=validator_function)
Answer: a) field_name = StringField(validation=validator_function)
Explanation: The syntax for adding a validation rule to a MongoEngine field is to define a validator function and pass it as an argument using the validation keyword argument.
22. What is the purpose of the ComplexDateTimeField in MongoEngine?
a) To store dates and times with microsecond precision
b) To store dates and times with nanosecond precision
c) To store dates and times with millisecond precision
d) To store dates and times with second precision
Answer: c) To store dates and times with millisecond precision
Explanation: The ComplexDateTimeField in MongoEngine is used to store dates and times with millisecond precision, including timezone information.
23. What is the purpose of the SortedListField in MongoEngine?
a) To store a list of items in sorted order
b) To store a list of EmbeddedDocuments in sorted order
c) To store a list of key-value pairs in sorted order
d) To store a list of dictionaries in sorted order
Answer: a) To store a list of items in sorted order
Explanation: The SortedList Field in MongoEngine is used to store a list of items in sorted order, using a comparison function to determine the order.
24. What is the purpose of the QuerySet class in MongoEngine?
a) To define queries that can be executed against a MongoDB database
b) To represent a collection of documents in a MongoDB database
c) To provide a wrapper around the pymongo drive
d) To provide an interface for defining database indexes
Answer: a) To define queries that can be executed against a MongoDB database
Explanation: The QuerySet class in MongoEngine is used to define queries that can be executed against a MongoDB database, including filtering, sorting, and aggregation.
25. What is the syntax for creating an index in MongoEngine?
a) MyModel.create_index([(‘field_name’, 1)], unique=True)
b) MyModel.index((‘field_name’, 1), unique=True)
c) MyModel.createIndex({‘field_name’: 1, unique=True})
d) MyModel.createIndex(‘field_name’, 1, unique=True)
Answer: a) MyModel.create_index([(‘field_name’, 1)], unique=True)
Explanation: The syntax for creating an index in MongoEngine is to call the create_index method on the model class and pass a list of tuples representing the index keys, along with any optional index options such as unique.
MongoEngine is a powerful and easy-to-use Python object-document mapper for MongoDB databases. With its intuitive object-oriented interface and flexible querying capabilities, it simplifies the process of working with MongoDB and enables developers to build robust and scalable applications. Whether you’re building a simple blog or a complex web application, MongoEngine is a great choice for managing your data. We trust that you will discover this MongoEngine Online Quiz/ MongoEngine MCQ with Answers article valuable in comprehending this topic. To stay updated with the most recent technical quizzes, we recommend that you regularly follow our Freshersnow portal.