{"id":10277,"date":"2023-05-02T11:07:17","date_gmt":"2023-05-02T11:07:17","guid":{"rendered":"https:\/\/www.scmgalaxy.com\/tutorials\/?p=10277"},"modified":"2023-06-19T13:29:43","modified_gmt":"2023-06-19T13:29:43","slug":"top-50-mongodb-interview-questions-with-answers","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-mongodb-interview-questions-with-answers\/","title":{"rendered":"Top 50 Mongodb Interview Questions with Answers"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-54.png\" alt=\"\" class=\"wp-image-10280\" width=\"708\" height=\"321\" srcset=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-54.png 937w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-54-300x136.png 300w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-54-768x349.png 768w\" sizes=\"auto, (max-width: 708px) 100vw, 708px\" \/><figcaption class=\"wp-element-caption\"><strong><em>Mongodb Interview Questions with Answers<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<ol class=\"wp-block-list\">\n<li>What does MongoDB stand for?<br>a. Mongolian Database<br>b. Modern Document-Oriented Database<br>c. Mongo Datastore<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. Modern Document-Oriented Database<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>Which type of database is MongoDB?<br>a. Relational<br>b. Non-relational<br>c. Both a and b<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. Non-relational<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>Which language is used by MongoDB for queries?<br>a. SQL<br>b. XML<br>c. JSON<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. JSON<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>What is sharding in MongoDB?<br>a. Splitting of large datasets into smaller, more manageable parts<br>b. Combining of multiple smaller datasets into one large dataset<br>c. Clustering of databases for higher availability<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. Splitting of large datasets into smaller, more manageable parts<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\">\n<li>Which is the default port number for MongoDB?<br>a. 27017<br>b. 3306<br>c. 5432<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. 27017<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"6\">\n<li>What is the maximum size of a document in MongoDB?<br>a. 16 MB<br>b. 32 MB<br>c. 64 MB<br>d. 128 MB<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. 16 MB<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"7\">\n<li>Which command is used to create a collection in MongoDB?<br>a. db.createCollection()<br>b. collection.create()<br>c. create.collection()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.createCollection()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"8\">\n<li>Which operator is used for conditional expressions in MongoDB?<br>a. $<br>b. #<br>c. *<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. $<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"9\">\n<li>What is the role of Replica Sets in MongoDB?<br>a. Clustering of databases<br>b. Backup and recovery<br>c. High availability<br>d. All of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d. All of the above<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"10\">\n<li>Which command is used to create an index in MongoDB?<br>a. db.collection.createIndex()<br>b. index.create()<br>c. create.index()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.collection.createIndex()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"11\">\n<li>Which command is used to drop a database in MongoDB?<br>a. db.dropDatabase()<br>b. database.drop()<br>c. drop.database()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.dropDatabase()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"12\">\n<li>What is the output when you execute the command &#8220;db.collection.find().pretty()&#8221; in MongoDB shell?<br>a. All documents in the collection<br>b. Documents in the collection in a formatted way<br>c. Syntax error<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. Documents in the collection in a formatted way<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"13\">\n<li>Which operator is used for updating a document in MongoDB?<br>a. $<br>b. #<br>c. *<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. $<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"14\">\n<li>What is Aggregation in MongoDB?<br>a. Combining multiple documents into one document<br>b. Splitting of a document into multiple documents<br>c. Transforming data using various operations<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. Transforming data using various operations<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"15\">\n<li>Which command is used to insert a document in a collection in MongoDB?<br>a. db.collection.insert()<br>b. collection.insert()<br>c. insert.collection()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.collection.insert()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"16\">\n<li>What is a GridFS in MongoDB?<br>a. A tool for managing file uploads and downloads<br>b. An indexing mechanism for faster search<br>c. A database for time-series data<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A tool for managing file uploads and downloads<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"17\">\n<li>What is the role of WiredTiger storage engine in MongoDB?<br>a. Backup and recovery<br>b. Transactions<br>c. Clustering of databases<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. Transactions<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"18\">\n<li>Which are the supported data types in MongoDB?<br>a. Integer, Double, Long<br>b. String, Boolean, Date<br>c. Array, Object, BinData<br>d. All of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d. All of the above<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"19\">\n<li>Which operator is used for sorting in MongoDB?<br>a. $<br>b. #<br>c. *<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. *<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"20\">\n<li>What is the role of TTL index in MongoDB?<br>a. To store time-series data<br>b. To create a secondary index<br>c. To automatically delete data after a specified time<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. To automatically delete data after a specified time<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"21\">\n<li>What is a Connection Pool in MongoDB?<br>a. A mechanism to handle multiple connections to the database<br>b. A tool for backing up databases<br>c. A method for querying collections<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A mechanism to handle multiple connections to the database<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"22\">\n<li>Which command is used to find distinct values in a field in MongoDB?<br>a. db.collection.distinct()<br>b. collection.distinct()<br>c. distinct.collection()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.collection.distinct()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"23\">\n<li>Which method returns the number of documents matching a query in a collection in MongoDB?<br>a. db.collection.find()<br>b. db.collection.count()<br>c. db.collection.update()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. db.collection.count()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"24\">\n<li>What is a Compound Index in MongoDB?<br>a. An index on a single field<br>b. An index on multiple fields<br>c. An index on all fields in a collection<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. An index on multiple fields<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"25\">\n<li>Which operator is used for comparing values in MongoDB?<br>a. $<br>b. #<br>c. *<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b.<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"26\">\n<li>What is a Capped Collection in MongoDB?<br>a. A collection with a fixed size<br>b. A collection with a variable size<br>c. An index on all fields in a collection<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A collection with a fixed size<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"27\">\n<li>Which command is used to remove a document from a collection in MongoDB?<br>a. db.collection.remove()<br>b. collection.remove()<br>c. remove.collection()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.collection.remove()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"28\">\n<li>What is a Namespace in MongoDB?<br>a. A database name<br>b. A collection name<br>c. A combination of database and collection name<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. A combination of database and collection name<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"29\">\n<li>Which operator is used for pattern matching in MongoDB?<br>a. $<br>b. #<br>c. *<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. $<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"30\">\n<li>What is the role of Oplog in MongoDB?<br>a. To store time-series data<br>b. To keep track of database operations<br>c. To create a secondary index<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. To keep track of database operations<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"31\">\n<li>Which command is used to backup a database in MongoDB?<br>a. mongodump<br>b. mongorestore<br>c. mongoimport<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. mongodump<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"32\">\n<li>What is a database profiler in MongoDB?<br>a. A tool for monitoring database operations<br>b. A tool for creating backups<br>c. A tool for configuring server parameters<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A tool for monitoring database operations<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"33\">\n<li>Which method is used to update multiple documents in a collection in MongoDB?<br>a. db.collection.updateMany()<br>b. db.collection.update()<br>c. db.collection.find()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.collection.updateMany()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"34\">\n<li>What is a Replica Set Arbiter in MongoDB?<br>a. A process to elect the primary node<br>b. A process to sync data between nodes<br>c. A process to add and remove nodes<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A process to elect the primary node<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"35\">\n<li>Which method is used to aggregate data from multiple collections in MongoDB?<br>a. db.collection.aggregate()<br>b. db.collection.mapReduce()<br>c. db.collection.group()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.collection.aggregate()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"36\">\n<li>What is the role of Explain Plan in MongoDB?<br>a. To provide information about query optimization<br>b. To provide information about database operations<br>c. To provide information about server performance<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. To provide information about query optimization<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"37\">\n<li>Which aggregation operator is used to group data in MongoDB?<br>a. $project<br>b. $match<br>c. $group<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. $group<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"38\">\n<li>What is a Data Model in MongoDB?<br>a. A mechanism for storing data in tables<br>b. A mechanism for storing data in graphs<br>c. A mechanism for storing data in documents<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. A mechanism for storing data in documents<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"39\">\n<li>What is a Replica Set Member in MongoDB?<br>a. A node in a Replica Set<br>b. A backup of a node in a Replica Set<br>c. A process for electing the primary node<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A node in a Replica Set<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"40\">\n<li>Which method is used to update a specific document in a collection in MongoDB?<br>a. db.collection.updateOne()<br>b. db.collection.update()<br>c. db.collection.updateMany()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.collection.updateOne()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"41\">\n<li>What is the role of Journaling in MongoDB?<br>a. To provide faster search results<br>b. To provide redundancy<br>c. To minimize data loss in case of a crash<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. To minimize data loss in case of a crash<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"42\">\n<li>Which command is used to create a user in MongoDB?<br>a. db.createUser()<br>b. create.user()<br>c. user.create()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. db.createUser()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"43\">\n<li>What is an Embedded Document in MongoDB?<br>a. A document stored within another document<br>b. A document stored in a separate collection<br>c. A document stored in a separate database<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A document stored within another document<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"44\">\n<li>Which command is used to show the size of a collection in MongoDB?<br>a. db.collection.size()<br>b. db.collection.stats()<br>c. db.collection.count()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. db.collection.stats()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"45\">\n<li>What is a Database Profile in MongoDB?<br>a. A tool for monitoring database operations<br>b. A tool for creating backups<br>c. A tool for configuring server parameters<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A tool for monitoring database operations<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"46\">\n<li>Which command is used to show the list of indexes in a collection in MongoDB?<br>a. db.collection.showIndexes()<br>b. db.collection.describeIndexes()<br>c. db.collection.listIndexes()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. db.collection.listIndexes()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"47\">\n<li>What is a Collation in MongoDB?<br>a. A mechanism for sorting strings<br>b. A mechanism for sorting numbers<br>c. A mechanism for sorting dates<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A mechanism for sorting strings<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"48\">\n<li>Which method is used to limit the number of documents returned in a query in MongoDB?<br>a. db.collection.count()<br>b. db.collection.limit()<br>c. db.collection.find()<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b. db.collection.limit()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"49\">\n<li>What is a ReadConcern in MongoDB?<br>a. A mechanism for specifying the level of consistency in read operations<br>b. A mechanism for specifying the level of durability in write operations<br>c. A mechanism for specifying the level of availability in the server<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a. A mechanism for specifying the level of consistency in read operations<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"50\">\n<li>Which aggregation operator is used to unwind an array in MongoDB?<br>a. $project<br>b. $match<br>c. $unwind<br>d. None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c. $unwind<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Answer: b. Modern Document-Oriented Database Answer: b. Non-relational Answer: c. JSON Answer: a. Splitting of large datasets into smaller, more [&hellip;]<\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10277","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top 50 Mongodb Interview Questions with Answers - scmGalaxy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-mongodb-interview-questions-with-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 50 Mongodb Interview Questions with Answers - scmGalaxy\" \/>\n<meta property=\"og:description\" content=\"Answer: b. 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