MCQOPTIONS
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MCQOPTIONS
This section includes 49 Mcqs, each offering curated multiple-choice questions to sharpen your Mongodb knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
MongoDB treats the literals as projection flags, valid only in the _______ stage. |
| A. | $project |
| B. | $gmap |
| C. | $match |
| D. | None of the mentioned |
| Answer» B. $gmap | |
| 2. |
To avoid treating numeric or boolean literals as projection flags, use the _______ expression to wrap the numeric or boolean literals. |
| A. | $literal |
| B. | $bool |
| C. | $unwin |
| D. | None of the mentioned |
| Answer» B. $bool | |
| 3. |
________ applies an expression to each item in an array and returns an array with the applied results. |
| A. | $map |
| B. | $geo |
| C. | $geoRear |
| D. | None of the mentioned |
| Answer» B. $geo | |
| 4. |
Which of the following stages cannot appear multiple times in a pipeline? |
| A. | $regex |
| B. | $reg |
| C. | $match |
| D. | $out |
| Answer» D. $out | |
| 5. |
Which of the following returns the value that results from applying an expression to the last document? |
| A. | $end |
| B. | $last |
| C. | $max |
| D. | All of the mentioned |
| Answer» C. $max | |
| 6. |
$setIsSubset returns _______ if all elements of the first set appear in the second set, including when the first set equals the second set. |
| A. | Null |
| B. | True |
| C. | False |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 7. |
In MongoDB __________ mongos retrieves the results from each shard, performs a merge sort to order the results. |
| A. | 3.0 |
| B. | 2.0 |
| C. | 1.0 |
| D. | None of the mentioned |
| Answer» C. 1.0 | |
| 8. |
You can only use jsMode for result sets with fewer than 500,000 distinct key arguments to the mapper’s _______ function. |
| A. | emit() |
| B. | emitter() |
| C. | emitted() |
| D. | none of the mentioned |
| Answer» B. emitter() | |
| 9. |
Which of the following mode defaults to false? |
| A. | jsMode |
| B. | scope |
| C. | finalize |
| D. | min |
| Answer» B. scope | |
| 10. |
$allElementsTrue returns true if no element of a set evaluates to ____________ |
| A. | false |
| B. | true |
| C. | 0 |
| D. | 1 |
| Answer» B. true | |
| 11. |
__________ returns the day of the year for a date as a number between 1 and 366. |
| A. | $dayofWeekend |
| B. | $dayOfWeek |
| C. | $dayOfYear |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 12. |
________ subtracts two dates to return the difference in milliseconds. |
| A. | $rem |
| B. | $mod |
| C. | $div |
| D. | $subtract |
| Answer» B. $mod | |
| 13. |
Which of the following accepts a single argument expression? |
| A. | $toLow |
| B. | $toUpper |
| C. | $toEqual |
| D. | None of the mentioned |
| Answer» C. $toEqual | |
| 14. |
Which of the following returns a substring of a string? |
| A. | $subs |
| B. | $substring |
| C. | $substr |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 15. |
Which of the following performs case-insensitive string comparison? |
| A. | $strcasecmpequals |
| B. | $strcasecmp |
| C. | $strcmp |
| D. | None of the mentioned |
| Answer» B. $strcasecmp | |
| 16. |
____________ works similar to HAVING clause in SQL. |
| A. | $setcon |
| B. | $group |
| C. | $match |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 17. |
________ passes the first n documents unmodified to the pipeline where n is the specified limit. |
| A. | $skip |
| B. | $limit |
| C. | $match |
| D. | $redact |
| Answer» C. $match | |
| 18. |
Cursors returned from aggregation only supports cursor methods like ________________ |
| A. | cursor.hasNext() |
| B. | cursor.Next() |
| C. | cursor.has() |
| D. | all of the mentioned |
| Answer» B. cursor.Next() | |
| 19. |
Syntax for specifying an initial batch size for the cursor is ________________ |
| A. | cursor: { batchSize: <string> } |
| B. | cursor: { batchSize: <int> } |
| C. | cur: { batchSize: <int> } |
| D. | none of the mentioned |
| Answer» C. cur: { batchSize: <int> } | |
| 20. |
$sum is an accumulator operator available only in the _______ stage. |
| A. | $group |
| B. | $sets |
| C. | $accumulator |
| D. | None of the mentioned |
| Answer» B. $sets | |
| 21. |
$dayOfMonth returns the day of the month for a date as a number between ________________ |
| A. | 1 and 31 |
| B. | 1 and 30 |
| C. | 1 and 28 |
| D. | None of the mentioned |
| Answer» B. 1 and 30 | |
| 22. |
_______ reorders the document stream by a specified sort key. |
| A. | $skip |
| B. | $limit |
| C. | $sort |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 23. |
Which of the following is syntax for calculating minimum value? |
| A. | { $minimum: <int> } |
| B. | { $min: <expression>} |
| C. | { $minimum: <expression> } |
| D. | None of the mentioned |
| Answer» C. { $minimum: <expression> } | |
| 24. |
Which of the following returns year for particular date? |
| A. | $year |
| B. | $yearday |
| C. | $syearofmonth |
| D. | None of the mentioned |
| Answer» B. $yearday | |
| 25. |
Which of the following function follows the reduce method and modifies the output? |
| A. | finalize |
| B. | final |
| C. | max |
| D. | all of the mentioned |
| Answer» B. final | |
| 26. |
What would be the maximum document size for results of mapreduce operation? |
| A. | 15 MB |
| B. | 16 MB |
| C. | 17 MB |
| D. | All of the mentioned |
| Answer» C. 17 MB | |
| 27. |
Which of the following accepts named parameters? |
| A. | $reduce |
| B. | $letnum |
| C. | $let |
| D. | None of the mentioned |
| Answer» E. | |
| 28. |
Which of the following accepts any number of argument expression? |
| A. | $setIntersection |
| B. | $setDifference |
| C. | $setEquals |
| D. | None of the mentioned |
| Answer» B. $setDifference | |
| 29. |
Which of the following method is overrided by Index filters? |
| A. | hint |
| B. | plan |
| C. | execute |
| D. | all of the mentioned |
| Answer» B. plan | |
| 30. |
Which of the following provides similar functionality to join? |
| A. | $unwindelem |
| B. | $unwind |
| C. | $unwin |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 31. |
________ limits the number of documents in result set. |
| A. | $project |
| B. | $geo |
| C. | $limit |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 32. |
Which of the following can be used to implement field level redaction? |
| A. | $skip |
| B. | $limit |
| C. | $match |
| D. | $redact |
| Answer» E. | |
| 33. |
Which of the following statement is equivalent to “$$CURRENT.
|
| A. | “$%<field>” |
| B. | “%<field>” |
| C. | “$$<field>” |
| D. | “$<field>” |
| Answer» E. | |
| 34. |
Which of the following ignores non numeric values? |
| A. | $order |
| B. | $sum |
| C. | $asc |
| D. | None of the mentioned |
| Answer» C. $asc | |
| 35. |
Which of the following database command is used for mapreduce function? |
| A. | mapReduce |
| B. | mapperRed |
| C. | redmap |
| D. | none of the mentioned |
| Answer» B. mapperRed | |
| 36. |
__________ specifies global variables that are accessible in the map. |
| A. | jsMode |
| B. | scope |
| C. | finalize |
| D. | Min |
| Answer» C. finalize | |
| 37. |
Which of the operator is similar to order by clause in RDBMS? |
| A. | $sort |
| B. | $match |
| C. | $sortby |
| D. | None of the mentioned |
| Answer» B. $match | |
| 38. |
Which of the following returns the hour for a date as a number between 0 and 23? |
| A. | $minute |
| B. | $hour |
| C. | $seconds |
| D. | All of the mentioned |
| Answer» C. $seconds | |
| 39. |
In the vars assignment block, ________ refers to the value of an externally defined variable low. |
| A. | “$$low” |
| B. | “$$lowin” |
| C. | “$$1” |
| D. | None of the mentioned |
| Answer» B. “$$lowin” | |
| 40. |
Which of the following operator is related to geography of data? |
| A. | $geoSpatial |
| B. | $geoNear |
| C. | $geoRear |
| D. | None of the mentioned |
| Answer» C. $geoRear | |
| 41. |
Which of the following operation can be optionally used for map reduce? |
| A. | finally |
| B. | final |
| C. | static |
| D. | none of the mentioned |
| Answer» B. final | |
| 42. |
TO_AVOID_TREATING_NUMERIC_OR_BOOLEAN_LITERALS_AS_PROJECTION_FLAGS,_USE_THE_________EXPRESSION_TO_WRAP_THE_NUMERIC_OR_BOOLEAN_LITERALS.?$ |
| A. | $literal |
| B. | $bool |
| C. | $unwin |
| D. | None of the mentioned |
| Answer» B. $bool | |
| 43. |
MongoDB treats the literals as projection flags, valid only in the _______ stage.$ |
| A. | $project |
| B. | $gmap |
| C. | $match |
| D. | None of the mentioned |
| Answer» B. $gmap | |
| 44. |
MongoDB_treats_the_literals_as_projection_flags,_valid_only_in_the_________stage.$ |
| A. | $project |
| B. | $gmap |
| C. | $match |
| D. | None of the mentioned |
| Answer» B. $gmap | |
| 45. |
In the vars assignment block, ________ refers to the value of an externally defined variable low ? |
| A. | ‚Äö√Ñ√∂‚àö√ë‚àö‚à?#$low‚Äö√Ñ√∂‚àö√ë‚àöœÄ |
| B. | ‚Äö√Ñ√∂‚àö√ë‚àö‚à?#$lowin‚Äö√Ñ√∂‚àö√ë‚àöœÄ |
| C. | ‚Äö√Ñ√∂‚àö√ë‚àö‚à?#$1‚Äö√Ñ√∂‚àö√ë‚àöœÄ |
| D. | None of the mentioned |
| Answer» B. ‚Äö√Ñ√∂‚àö√ë‚àö‚à?#$lowin‚Äö√Ñ√∂‚àö√ë‚àöœÄ | |
| 46. |
______ binds variables for use in the specified expression. |
| A. | $skip |
| B. | $let |
| C. | $bind |
| D. | None of the mentioned |
| Answer» C. $bind | |
| 47. |
Which of the following statement is equivalent to “$$CURRENT.
|
| A. | “$%<field>” |
| B. | “%<field>” |
| C. | “$$<field>” |
| D. | “$<field>” |
| Answer» E. | |
| 48. |
Aggregation expressions use ______ path to access fields in the input documents. |
| A. | mpath |
| B. | dbpath |
| C. | lpath |
| D. | field |
| Answer» E. | |
| 49. |
Which of the following stages cannot appear multiple times in a pipeline ? |
| A. | $regex |
| B. | $reg |
| C. | $match |
| D. | $out |
| Answer» D. $out | |