HTML
   HTML5
   CSS
   CSS3
   JavaScript
   jQuery
   AngularJS
   Articles
   Tech Articles
   Blog
Google News
logo
PouchDB - Quiz(MCQ)

PouchDB : PouchDB is an open-source JavaScript database inspired by Apache CouchDB that is designed to run well within the browser.

PouchDB was created to help web developers build applications that work as well offline as they do online.

PouchDB is an in-browser database that allows applications to save data locally, so that users can enjoy all the features of an app even when they're offline. Plus, the data is synchronized between clients, so users can stay up-to-date wherever they go.

PouchDB also runs in Node.js and can be used as a direct interface to CouchDB-compatible servers. The API works the same in every environment, so you can spend less time worrying about browser differences, and more time writing clean, consistent code.

1 .
What is PouchDB?
A)
A CSS framework
B)
A programming language
C)
A server-side technology
D)
A JavaScript database library

Correct Answer :   A JavaScript database library

Explanation : PouchDB is a JavaScript database library that can be used in web and mobile applications to store and manage data.

2 .
What type of database does PouchDB use by default?
A)
SQL
B)
NoSQL
C)
Graph
D)
Relational

Correct Answer :   NoSQL

Explanation : PouchDB uses a NoSQL database by default, specifically the Apache CouchDB database.

3 .
Which of the following format does PouchDB uses to store the data?
A)
Graph-based
B)
Column-based
C)
Document-based
D)
Key-value based

Correct Answer :   Document-based

Explanation : PouchDB stores data in a document-based format.

4 .
Is PouchDB open-source?
A)
Yes
B)
No
C)
Can Not Say
D)
None of the above

Correct Answer :   Yes

Explanation : Yes, PouchDB is open-source.

5 .
Which of the following is not a feature of PouchDB?
A)
Querying
B)
Animation
C)
Replication
D)
Authentication

Correct Answer :   Animation

Explanation : PouchDB does not have built-in support for animation.

6 .
Which of the following is a benefit of using PouchDB?
A)
Only works with small datasets
B)
Easy integration with only one framework
C)
Can sync data between clients and servers
D)
Limited flexibility and customization options

Correct Answer :   Can sync data between clients and servers

Explanation : PouchDB provides the ability to sync data between clients and servers, which is a major benefit for applications that need offline functionality.

7 .
While the application is offline with PouchDB, the data is saved locally in the browser using ____?
A)
WebSQL
B)
IndexedDB
C)
Both (A) and (B)
D)
None of the above

Correct Answer :   Both (A) and (B)

Explanation : While the application is offline with PouchDB, the data is saved locally in the browser using WebSQL and IndexedDB.

8 .
You can create a database in PouchDB using the ____?
A)
PouchDB field
B)
PouchDB Tables
C)
PouchDB object
D)
PouchDB constructor

Correct Answer :   PouchDB constructor

Explanation : You can create a database in PouchDB using the PouchDB constructor.

9 .
Which of the following method can get the basic information about the database?
A)
Info()
B)
Db_info()
C)
Information()
D)
databaseInfo()

Correct Answer :   Info()

Explanation : info() method can get the basic information about the database.

10 .
How can PouchDB be used in a web application?
A)
As a client-side database
B)
As a server-side database
C)
Both (A) and (B)
D)
None of the above

Correct Answer :   Both (A) and (B)

Explanation : PouchDB can be used as both a client-side and server-side database in a web application.

11 .
What is the purpose of PouchDB's 'changes' API?
A)
To retrieve a specific document by ID
B)
To listen for changes to the database
C)
To retrieve all documents in the database
D)
To delete a document from the database

Correct Answer :   To listen for changes to the database

Explanation : PouchDB’s “changes” API allows you to listen for changes to the database in real-time, such as when a new document is added or an existing document is updated or deleted.

12 .
What is the syntax for creating a new instance of PouchDB?
A)
var db = new PouchDB(“mydb”);
B)
var db = new Database(“mydb”);
C)
var db = createPouchDB(“mydb”);
D)
var db = PouchDB.create(“mydb”);

Correct Answer :   var db = new PouchDB(“mydb”);

Explanation : The syntax for creating a new instance of PouchDB is “var db = new PouchDB(‘mydb’)”.

13 .
Which of the following is not a method for querying data in PouchDB?
A)
find()
B)
insert()
C)
query()
D)
allDocs()

Correct Answer :   db.insert()

Explanation : The “db.insert()” method is not used for querying data in PouchDB, but rather for inserting new documents into the database.

14 .
Which of the following function may be used to delete a database in PouchDB?
A)
Db.del()
B)
Db.delete()
C)
Db.remove()
D)
Db.destroy()

Correct Answer :   Db.destroy()

Explanation : PouchDB's db.destroy() function may be used to delete a database.

15 .
With the ____ function, you can create a document in PouchDB.
A)
db.new()
B)
db.create()
C)
db.put()
D)
None of the above

Correct Answer :   db.put()

Explanation : With the db.put() function, you can create a document in PouchDB.

16 .
With the ____ function, you can create an array (batch) of documents in PouchDB.
A)
db.arraybulk()
B)
db.bulkarray()
C)
db.bulkDocs()
D)
None of the above

Correct Answer :   db.bulkDocs()

Explanation : With the db.bulkDocs() function, you can create an array (batch) of documents in PouchDB.

17 .
Which of the following method synchronizes data between multiple databases, either locally or remotely, using two-way replication?
A)
Sync()
B)
Async()
C)
Synchro()
D)
Synchronization()

Correct Answer :   Sync()

Explaination : Sync() method synchronizes data between multiple databases, either locally or remotely, using two-way replication.

18 .
How can you limit the number of documents returned by a PouchDB query?
A)
Use the “limit” method
B)
Use the “skip” method
C)
Use the “sort” method
D)
Use the “filter” method

Correct Answer :   Use the “limit” method

Explanation : The “limit” method can be used to limit the number of documents returned by a PouchDB query.

19 .
What is the purpose of PouchDB's 'replication' feature?
A)
To backup and restore a database
B)
To copy a database to a new location
C)
To compress data stored in the database
D)
To synchronize data between two or more databases

Correct Answer :   To synchronize data between two or more databases

Explanation : PouchDB’s “replication” feature allows you to synchronize data between two or more databases, making it easy to keep data consistent across multiple devices or servers.

20 .
Which of the following is not a type of PouchDB replication?
A)
One-way replication
B)
Two-way replication
C)
Three-way replication
D)
Multi-master replication

Correct Answer :   Three-way replication

Explanation : “Three-way replication” is not a type of PouchDB replication.

21 .
What is the purpose of PouchDB's 'conflicts' API?
A)
To update the schema of the database
B)
To resolve conflicts that occur during replication
C)
To delete documents from the database
D)
To retrieve a list of all documents in the database

Correct Answer :   To resolve conflicts that occur during replication

Explanation : PouchDB’s “conflicts” API allows you to resolve conflicts that occur during replication, such as when the same document is modified on two different devices.

22 .
Which of the following method adds an attachment to a database document?
A)
Attachment()
B)
Putattachment()
C)
Getattachment()
D)
None of the above

Correct Answer :   Putattachment()

Explanation : Putattachment() method adds an attachment to a database document.

23 .
Which of the following method fetches an attachment from a database document?
A)
Getattachment()
B)
Attachment()
C)
Putattachment()
D)
All of the above

Correct Answer :   Getattachment()

Explanation : Getattachment() method fetches an attachment from a database document.

24 .
______-method allows you to listen in real-time for changes to the database and trigger events depending on those changes.
A)
Changes()
B)
Listen()
C)
Listenchanges()
D)
None of the above

Correct Answer :   Changes()

Explaination : Changes() method allows you to listen in real-time for changes to the database and trigger events depending on those changes.

25 .
_____- function returns all documents from the database or a subset of documents based on arguments like startkey, endkey, limit, and so on.
A)
Getdocs()
B)
Bulkdocs()
C)
Alldocs()
D)
None of the above

Correct Answer :   Alldocs()

Explaination : alldocs() function returns all documents from the database or a subset of documents based on arguments like startkey, endkey, limit, and so on.

26 .
What is the syntax for initiating a replication in PouchDB?
A)
replicate(from, to)
B)
replicate.to(from)
C)
replicate.all(from, to)
D)
sync(from, to)

Correct Answer :   sync(from, to)

Explanation : The syntax for initiating a replication in PouchDB is “db.sync(from, to)”.

27 .
Which of the following browsers does PouchDB supports?
A)
Chrome 30+
B)
Safari 5+
C)
Internet Explorer 10+
D)
All of the above

Correct Answer :   All of the above

Explanation : Following databases PouchDB supports :

* Chrome 30+
* Safari 5+
* Internet Explorer 10+
* Opera 21+

28 .
The ____ function may be used to minimize the size of a database by deleting unneeded data.
A)
Min()
B)
Reduce()
C)
compact()
D)
Minimize()

Correct Answer :   compact()

Explanation : The compact() function may be used to minimize the size of a database by deleting unneeded data.

29 .
_rev in PouchDB is known as ____?
A)
Revision
B)
Revision marker
C)
Revolution
D)
Revision maker

Correct Answer :   Revision marker

Explanation : _rev is known as a revision marker.

30 .
With the ____ function, you may delete a document from a PouchDB database.
A)
db.remove()
B)
db.delete()
C)
db.remove()
D)
db.destroy()

Correct Answer :   db.remove()

Explanation : With the db.remove() function, you may delete a document from a PouchDB database.

31 .
How can you use PouchDB to implement offline-first functionality in a web application?
A)
By caching all data in the browser
B)
By using a browser plugin to cache data
C)
By relying on the browser’s built-in offline mode
D)
By using a service worker to intercept network requests

Correct Answer :   By using a service worker to intercept network requests

Explanation : By using a service worker to intercept network requests, you can use PouchDB to cache and manage data locally, allowing your web application to function offline-first.

32 .
What is the purpose of PouchDB's 'live' API?
A)
To compress data stored in the database
B)
To stream data from the database in real-time
C)
To limit the amount of data returned by a query
D)
To retrieve data from the database on a set interval

Correct Answer :   To stream data from the database in real-time

Explanation : PouchDB’s “live” API allows you to stream data from the database in real-time, so that any changes to the database are immediately reflected in the client.

33 .
What is the purpose of PouchDB's 'attachments' API?
A)
To encrypt data stored in the database
B)
To delete documents from the database
C)
To add images or other files to a document
D)
To compress data stored in the database

Correct Answer :   To add images or other files to a document

Explanation : PouchDB’s “attachments” API allows you to add images or other files to a document in the database.

34 .
Which of the following is not a benefit of using PouchDB for mobile applications?
A)
Native UI components
B)
Offline data access
C)
Cross-platform compatibility
D)
Synchronization between devices

Correct Answer :   Native UI components

Explanation : PouchDB is not designed to provide native UI components for mobile applications.

35 .
What are the alternatives to PouchDB?
A)
Realm
B)
SQLlite
C)
MongoDB
D)
All of the above

Correct Answer :   All of the above

Explanation : Following are the alternatives to PouchDB :

* SQLlite
* Realm
* MongoDB

36 .
Which of the following is not a supported platform for PouchDB?
A)
js
B)
iOS
C)
Android
D)
Web browsers

Correct Answer :   iOS

Explanation : While PouchDB can be used with iOS through web views, it is not specifically designed for iOS.

37 .
What is the purpose of PouchDB's 'Live Query' plug-in?
A)
To optimize database queries for better performance
B)
To query a database without updating the results as the data changes
C)
To perform complex queries that cannot be done with standard database tools
D)
To run live queries on a database and receive real-time updates as the data changes

Correct Answer :   To run live queries on a database and receive real-time updates as the data changes

Explanation : PouchDB’s “Live Query” plug-in allows you to run live queries on a database and receive real-time updates as the data changes.

38 .
What is the syntax for using the PouchDB 'Replication Sync' plug-in to replicate data between two databases?
A)
copy(source, target)
B)
transfer(source, target)
C)
sync(source, target)
D)
replicate(source, target)

Correct Answer :   sync(source, target)

Explaination : The syntax for using the PouchDB “Replication Sync” plug-in to replicate data between two databases is “db.sync(source, target)”.

39 .
What is the purpose of PouchDB's 'Replication Sync' plug-in?
A)
To replicate data between databases using HTTP requests
B)
To replicate data between databases using streams
C)
To replicate data between databases using Bluetooth
D)
To replicate data between databases using web sockets

Correct Answer :   To replicate data between databases using HTTP requests

Explanation : PouchDB’s “Replication Sync” plug-in allows you to replicate data between databases using HTTP requests.

40 .
What is the syntax for encrypting a database with the PouchDB 'Encryption' plug-in?
A)
lock(password)
B)
secure(password)
C)
encrypt(password)
D)
protect(password)

Correct Answer :   db.encrypt(password)

Explanation : The syntax for encrypting a database with the PouchDB “Encryption” plug-in is “db.encrypt(password)”.

41 .
What is the purpose of PouchDB's 'index' API?
A)
To encrypt data stored in the database
B)
To create indexes for fast queries
C)
To delete documents from the database
D)
To compress data stored in the database

Correct Answer :   To create indexes for fast queries

Explanation : PouchDB’s “index” API allows you to create indexes for fast queries on specific fields in the database.

42 .
What is the syntax for creating a PouchDB index?
A)
index(indexName, fieldName)
B)
create(indexName, fieldName)
C)
createIndex(indexName, fieldName)
D)
index.create(indexName, fieldName)

Correct Answer :   db.createIndex(indexName, fieldName)

Explanation : The syntax for creating a PouchDB index is “db.createIndex(indexName, fieldName)”.

43 .
What is the purpose of PouchDB's 'map/reduce' functions?
A)
To encrypt data stored in the database
B)
To delete documents from the database
C)
To compress data stored in the database
D)
To transform and filter data returned by queries

Correct Answer :   To transform and filter data returned by queries

Explanation : PouchDB’s “map/reduce” functions allow you to transform and filter data returned by queries, allowing for more powerful and flexible data processing.

44 .
What is the syntax for querying a PouchDB database using a map/reduce function?
A)
map(mapFunction, reduceFunction)
B)
query(mapFunction, reduceFunction)
C)
reduce(mapFunction, reduceFunction)
D)
mapReduce(mapFunction, reduceFunction)

Correct Answer :   db.mapReduce(mapFunction, reduceFunction)

Explanation : The syntax for querying a PouchDB database using a map/reduce function is “db.mapReduce(mapFunction, reduceFunction)”.

45 .
Which of the following is not a PouchDB event?
A)
submit
B)
error
C)
change
D)
complete

Correct Answer :   submit

Explanation : “Submit” is not a PouchDB event.

46 .
What is the syntax for replicating a PouchDB database?
A)
copy(source, target)
B)
sync(source, target)
C)
replicate(source, target)
D)
transfer(source, target)

Correct Answer :   sync(source, target)

Explanation : The syntax for replicating a PouchDB database is “db.sync(source, target)”.

47 .
What is the purpose of PouchDB's 'bulkDocs' API?
A)
To delete multiple documents from the database
B)
To compress multiple documents in the database
C)
To retrieve multiple documents from the database
D)
To insert or update multiple documents in the database

Correct Answer :   To insert or update multiple documents in the database

Explanation : PouchDB’s “bulkDocs” API allows you to insert or update multiple documents in the database at once, which can be more efficient than inserting or updating them one at a time.

48 .
Which of the following is not a way to create a PouchDB database?
A)
By importing data from a CSV file
B)
By replicating an existing database
C)
By instantiating a new PouchDB object
D)
By creating a new CouchDB database and syncing it with PouchDB

Correct Answer :   By importing data from a CSV file

Explanation : While you can import data from a CSV file into a PouchDB database, this is not a way to create a new PouchDB database.

49 .
Which encryption algorithm is used by the PouchDB 'Encryption' plug-in?
A)
RSA
B)
AES-128
C)
AES-256
D)
SHA-256

Correct Answer :   AES-256

Explanation : The PouchDB “Encryption” plug-in uses the AES-256 encryption algorithm.

50 .
What is the purpose of PouchDB's 'Encryption' plug-in?
A)
To replicate data between databases
B)
To encrypt data stored in the database
C)
To provide secure authentication for users
D)
To compress a database to save disk space

Correct Answer :   To encrypt data stored in the database

Explanation : PouchDB’s “Encryption” plug-in allows you to encrypt data stored in the database.

51 .
What is the syntax for using the PouchDB 'Migrate' plug-in to migrate data between database formats?
A)
convert(source, target)
B)
migrate(source, target)
C)
migrateData(source, target)
D)
transferData(source, target)

Correct Answer :   db.migrate(source, target)

Explanation : The syntax for using the PouchDB “Migrate” plug-in to migrate data between database formats is “db.migrate(source, target)”.

52 .
What is the purpose of PouchDB's 'Migrate' plug-in?
A)
To migrate data between different database formats
B)
To migrate data between different databases
C)
To migrate data from a local database to a remote database
D)
To migrate data from a remote database to a local database

Correct Answer :   To migrate data between different database formats

Explanation : PouchDB’s “Migrate” plug-in allows you to migrate data between different database formats, such as from one version of PouchDB to another.

53 .
What is the syntax for using the PouchDB 'Upsert' plug-in to insert or update a document?
A)
insert(doc)
B)
update(doc)
C)
Both (A) and (B)
D)
upsert(doc)

Correct Answer :   db.upsert(doc)

Explanation : The syntax for using the PouchDB “Upsert” plug-in to insert or update a document is “db.upsert(doc)“.

54 .
What is the purpose of PouchDB's 'Upsert' plug-in?
A)
To delete documents from the database
B)
To insert new documents into the database
C)
To update existing documents in the database
D)
To insert or update documents in the database based on their existing state

Correct Answer :   To insert or update documents in the database based on their existing state

Explanation : PouchDB’s “Upsert” plug-in allows you to insert or update documents in the database based on their existing state, rather than just inserting new documents or updating existing ones.

55 .
What is the purpose of PouchDB's 'Replication Stream' plug-in?
A)
To compress a database to save disk space
B)
To provide secure authentication for users
C)
To replicate data between databases using streams
D)
To monitor changes to the database in real-time

Correct Answer :   To replicate data between databases using streams

Explanation : PouchDB’s “Replication Stream” plug-in allows you to replicate data between databases using streams, which can be more efficient than using the standard replication API.

56 .
Which of the following is not a benefit of using the PouchDB 'Replication Stream' plug-in?
A)
Reduced memory usage
B)
Improved data compression
C)
Improved replication speed
D)
Improved network efficiency

Correct Answer :   Improved data compression

Explanation : While using streams can improve replication speed, reduce memory usage, and improve network efficiency, it does not improve data compression.

57 .
What is the syntax for creating a new user with the PouchDB 'Authentication' plug-in?
A)
signup(username, password)
B)
create(username, password)
C)
newUser(username, password)
D)
addUser(username, password)

Correct Answer :   db.signup(username, password)

Explanation : The syntax for creating a new user with the PouchDB “Authentication” plug-in is “db.signup(username, password)”.

58 .
What is the purpose of PouchDB's 'destroy' API?
A)
To backup a database to a file
B)
To permanently delete a database
C)
To empty a database of all documents
D)
To compress a database to save disk space

Correct Answer :   To permanently delete a database

Explanation : PouchDB’s “destroy” API allows you to permanently delete a database, removing it from the file system.

59 .
What is the purpose of PouchDB's 'Find' plug-in?
A)
To create indexes for fast queries
B)
To replicate data between databases
C)
To provide a simplified query syntax
D)
To monitor changes to the database in real-time

Correct Answer :   To provide a simplified query syntax

Explanation : PouchDB’s “Find” plug-in provides a simplified query syntax for querying the database.

60 .
What is the syntax for using the PouchDB 'Find' plug-in to query a database?
A)
query(query)
B)
filter(query)
C)
search(query)
D)
find(query)

Correct Answer :   db.find(query)

Explanation : The syntax for using the PouchDB “Find” plug-in to query a database is “db.find(query)”.