MCQOPTIONS
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MCQOPTIONS
This section includes 43 Mcqs, each offering curated multiple-choice questions to sharpen your Mongodb knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following operator is not very selective? |
| A. | $nine |
| B. | $nin |
| C. | $ain |
| D. | None of the mentioned |
| Answer» C. $ain | |
| 2. |
Which of the following statement will insert 400 documents in to the testData collection? |
| A. | insertData("test", "testData", 200) |
| B. | insertData("test", "testData", 400) |
| C. | insertData("test", "testData", 600) |
| D. | all of the mentioned |
| Answer» C. insertData("test", "testData", 600) | |
| 3. |
When you query a collection, MongoDB returns a ________ object that contains the results of the query. |
| A. | row |
| B. | cursor |
| C. | colums |
| D. | none of the mentioned |
| Answer» C. colums | |
| 4. |
_________ is used to view statistics about the query plan for a given query. |
| A. | db.explain() |
| B. | cursor.explain() |
| C. | cursor.explainstats() |
| D. | all of the mentioned |
| Answer» C. cursor.explainstats() | |
| 5. |
Which of the following is not a projection operator? |
| A. | $slice |
| B. | $elemMatch |
| C. | $ |
| D. | None of the mentioned |
| Answer» E. | |
| 6. |
Applications can also control the behavior of write operations using _______ concern. |
| A. | read |
| B. | write |
| C. | truncate |
| D. | all of the mentioned |
| Answer» C. truncate | |
| 7. |
Which of the following operation adds a new document to the users collection? |
| A. | add |
| B. | insert |
| C. | truncate |
| D. | drop |
| Answer» C. truncate | |
| 8. |
Which of the following query selects documents in the records collection that match the condition { “user_id”: { $lt: 42 } }? |
| A. | db.records.findOne( { “user_id”: { $lt: 42 } }, { “history”: 0 } ) |
| B. | db.records.find( { “user_id”: { $lt: 42 } }, { “history”: 0 } ) |
| C. | db.records.findOne( { “user_id”: { $lt: 42 } }, { “history”: 1 } ) |
| D. | db.records.select( { “user_id”: { $lt: 42 } }, { “history”: 0 } ) |
| Answer» C. db.records.findOne( { “user_id”: { $lt: 42 } }, { “history”: 1 } ) | |
| 9. |
MongoDB stores all documents in _____________ |
| A. | tables |
| B. | collections |
| C. | rows |
| D. | all of the mentioned |
| Answer» C. rows | |
| 10. |
To suppress the _id field from the result set, specify _________ in the projection document. |
| A. | _id: 1 |
| B. | _id: 0 |
| C. | _id: it |
| D. | None of the mentioned |
| Answer» C. _id: it | |
| 11. |
Which of the following is the second argument to projection? |
| A. | findOne() |
| B. | findOne1() |
| C. | selectOne() |
| D. | find() |
| Answer» E. | |
| 12. |
The __________ method limits the number of documents in the result set. |
| A. | limit() |
| B. | limitOf() |
| C. | limitBy() |
| D. | none of the mentioned |
| Answer» B. limitOf() | |
| 13. |
An index cannot cover a query on a _______ collection when run against a mongos if the index does not contain the shard key. |
| A. | vertical |
| B. | sharded |
| C. | horizontal |
| D. | none of the mentioned |
| Answer» C. horizontal | |
| 14. |
The mongo shell loads and parses the ___________ file on startup. |
| A. | mongo.js |
| B. | mongoc.js |
| C. | mongorc.js |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 15. |
Which of the following will display complete list of available cursor flags? |
| A. | cursor.Option() |
| B. | cursor.addOption() |
| C. | cursor.addOptions() |
| D. | all of the mentioned |
| Answer» C. cursor.addOptions() | |
| 16. |
To iterate the cursor and return more documents, type _________ in the mongo shell. |
| A. | cursor |
| B. | it |
| C. | next |
| D. | none of the mentioned |
| Answer» C. next | |
| 17. |
Which of the following flag can be set by mongo shell? |
| A. | Timeout |
| B. | noTimeout |
| C. | Time |
| D. | None of the mentioned |
| Answer» C. Time | |
| 18. |
Which of the following method returns a cursor? |
| A. | find |
| B. | sort |
| C. | skip |
| D. | all of the mentioned |
| Answer» B. sort | |
| 19. |
A ________ query plan has returned a threshold number of matching results. |
| A. | execution |
| B. | unordered |
| C. | ordered |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 20. |
Which of the following line skips the first 5 documents in the bios collection and returns all remaining documents? |
| A. | db.bios.find().limit( 5 ) |
| B. | db.bios.find().skip( 1 ) |
| C. | db.bios.find().skip( 5 ) |
| D. | db.bios.find().sort( 5 ) |
| Answer» D. db.bios.find().sort( 5 ) | |
| 21. |
Which of the following method corresponds to Order by clause in SQL? |
| A. | sort() |
| B. | order() |
| C. | orderby() |
| D. | all of the mentioned |
| Answer» B. order() | |
| 22. |
Which of the following pipeline is used for aggregation in MongoDB? |
| A. | data processing |
| B. | information processing |
| C. | knowledge processing |
| D. | none of the mentioned |
| Answer» B. information processing | |
| 23. |
_id is a ________ bytes hexadecimal number which assures the uniqueness of every document. |
| A. | 13 |
| B. | 16 |
| C. | 12 |
| D. | 10 |
| Answer» D. 10 | |
| 24. |
Which of the following functionality is used for aggregation framework? |
| A. | $match |
| B. | $project |
| C. | $projectmatch |
| D. | All of the mentioned |
| Answer» C. $projectmatch | |
| 25. |
With a receipt acknowledged write concern, the _________confirms that it received the write operation and applied the change to the in-memory view of data. |
| A. | mongod |
| B. | mongos |
| C. | mongo |
| D. | mongoc |
| Answer» B. mongos | |
| 26. |
Which of the following function is valid for creation of new data inside MongoDB Shell? |
| A. | function insertData(dbName, colName, num) |
| B. | function insertData(dbName, colName, num) |
| C. | insertData(dbName, colName, num) |
| D. | None of the mentioned |
| Answer» B. function insertData(dbName, colName, num) | |
| 27. |
Which of the following method returns true if the cursor has documents? |
| A. | hasMethod() |
| B. | hasNext() |
| C. | hasDoc() |
| D. | all of the mentioned |
| Answer» C. hasDoc() | |
| 28. |
_____ can modify specific fields of an existing document or documents or replace an existing document entirely, depending on the update parameter. |
| A. | modify() |
| B. | update() |
| C. | find() |
| D. | none of the mentioned |
| Answer» C. find() | |
| 29. |
Which of the following method is called while accessing documents using the array index notation? |
| A. | cur.toArray() |
| B. | cursor.toArray() |
| C. | doc.toArray() |
| D. | all of the mentioned |
| Answer» C. doc.toArray() | |
| 30. |
Which of the following key is used to denote uniqueness in the collection? |
| A. | _id |
| B. | id |
| C. | id_ |
| D. | none of the mentioned |
| Answer» B. id | |
| 31. |
___________ concern describes the guarantee that MongoDB provides when reporting on the success of a write operation. |
| A. | Write |
| B. | Read |
| C. | Update |
| D. | None of the mentioned |
| Answer» B. Read | |
| 32. |
With an __________ write concern, MongoDB does not acknowledge the receipt of write operations. |
| A. | Nacknowledged |
| B. | Acknowledgement |
| C. | Acknowledged |
| D. | Unacknowledged |
| Answer» E. | |
| 33. |
A query _______ consists of a combination of query, sort, and projection specifications. |
| A. | plan |
| B. | shape |
| C. | stats |
| D. | all of the mentioned |
| Answer» C. stats | |
| 34. |
MongoDB process collection of documents using _________ operations. |
| A. | Hbase |
| B. | Hive |
| C. | Map-reduce |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 35. |
Which of the following preference determines how the client direct read operations to the set? |
| A. | read |
| B. | write |
| C. | update |
| D. | delete |
| Answer» B. write | |
| 36. |
In MongoDB _________ operations modify the data of a single collection. |
| A. | CRUD |
| B. | GRID |
| C. | READ |
| D. | All of the mentioned |
| Answer» B. GRID | |
| 37. |
MongoDB does not ___________ modifications made before the wtimeout interval expired. |
| A. | commit |
| B. | rollback |
| C. | save |
| D. | all of the mentioned |
| Answer» C. save | |
| 38. |
Which of the following will implicitly create the collection testData? |
| A. | while (var i = 1; i <= 25; i++) |
| B. | for (var i = 1; i <= 25; i++) |
| C. | for (var i = 1; i <= 25; i++) |
| D. | None of the mentioned |
| Answer» C. for (var i = 1; i <= 25; i++) | |
| 39. |
Which of the following operation is used to switch to new database mydb? |
| A. | use dbs |
| B. | use db |
| C. | use mydb |
| D. | use mydbs |
| Answer» D. use mydbs | |
| 40. |
__________ is a part of the standard MongoDB distribution and provides a full JavaScript environment. |
| A. | mongod |
| B. | mongodb |
| C. | mongo |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 41. |
Which of the following method is used to query documents in collections? |
| A. | find |
| B. | move |
| C. | shell |
| D. | replace |
| Answer» B. move | |
| 42. |
Which of the following also returns a list of databases? |
| A. | show databases |
| B. | show database |
| C. | display dbs |
| D. | all of the mentioned |
| Answer» B. show database | |
| 43. |
Command to check existence of collection is _____________ |
| A. | show collection |
| B. | show collections |
| C. | show collect |
| D. | none of the mentioned |
| Answer» C. show collect | |