Test your basic knowledge |

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Removes all occurrences of each value in the passed in array from the field. ex: { $pullAll : { field : value_array } }






2. The standard number representation in the javascript shell.






3. Appends each value in the value_array to the field - if field is an existing array. Otherwise - it sets the field to the array value_array - if field is not present ex: { $pushAll : { field : value_array } }






4. In BSON - represents the smallest possible value.






5. Less than or equal query conditional. ex: db.<col>.find({numVal: {$lte:3}});






6. Operator used in the second argument of the find() call to specify which slice of an array to return for an array field.






7. Contains query conditional used to check if a value contains the field value.






8. Returns one document matching the optional properties.






9. Adds a document to a collection.






10. Operator allowing the partial specification of fields in an embedded document in an array.






11. Standard javascript regular expressions. These can be stored in documents






12. Adds a value to the array only if its not in the array already. Otherwise, if the field is not present, it sets the field to the array value. ex: { $addToSet : { a : { $each : [ 3 , 5 , 6 ] } } }






13. Removes an element from an array based on the value of the field option being 1 or -1 for last or first element respectively. ex: { $pop : { field : -1 } }






14. Query conditional allowing the selector to choose between more than one optional criteria.






15. Clone the current database (implied by 'db') from another host.






16. Update a document in the collection.






17. Greater than or equal query conditional. ex: db.<col>.find({numVal: {$gte:3}});






18. Creates an index on property(s). Options can describe the type of sorting, uniqueness, etc.






19. command to start the mongodb process.






20. Returns all the documents matching the optional properties.






21. Special keys passed in an update call to specify complex update operations - such as alter - adding - or removing keys - and even manipulating arrays and embedded documents.






22. A document contained by a parent document. The embedded document is a value of a key in the parent document.






23. Lists all the collections in the database in use.






24. The local variable representation of a query. Uniquely - the cursor does not hold the results but instead access to the results.






25. Appends a value to field - if the field is an existing array. Otherwise it sets the field to the array [value] if field is not present. ex: { $push : { field : value } }






26. Update modifier used to increment a value. ex: {"$inc":{"counter":2}}






27. Updates all matching documents, not just the first, that match the selector.






28. Clone the current database (implied by 'db') from another host.






29. Update modifier that set the value of a key and if the key does not exist, it will create the key. ex: db.<col>.update({selector},{"$set":{"someKey":"someValue"}});






30. Operator allowing the execution of arbitrary javascript as part of the selector.






31. Returns help information for a command.






32. Not equal query conditional. ex: db.<col>.find({numVal: {$ne:3}});






33. Used to represent both a null value and a nonexistent field.






34. Meta query conditional used to negate the selector.






35. Binary-encoded serialization of mongo documents.






36. Does not contain query conditional used to select documents with the field that is not in the selector list of values.






37. set of UTF-8 characters.






38. Used to describe a variable as not having been initialized.






39. ...






40. Adds a document to a collection.






41. Set or list of values.






42. Copies an entire database from one name on one server to another name on another server. Omit frmHostName to copy from one name to another on the same server.






43. Deletes documents from the collection based on the selector.






44. Standard binary data type.






45. Returns all the documents matching the optional properties.






46. Deletes documents from the collection based on the selector.






47. Stored as milliseconds since the epoch.






48. Unique 12-byte ID for documents.






49. Positional operator that holds the position of the first matched array item in the query. Used to find an array member and then manipulate it. ex: {$inc:{'comments.$.votes':1}} where comments looks like: "comments" : [ { "by" : "joe", "votes" : 3 },






50. Returns help information for a command.






Can you answer 50 questions in 15 minutes?



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