MongoDB Questions and Answers – Aggregation Operations

This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Aggregation Operations”.

1. _______ filters the document stream to allow only matching documents to pass unmodified into the next pipeline stage.
a) $regex
b) $reg
c) $match
d) None of the mentioned
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2. Point out the wrong statement.
a) Documents do not pass through the stages in sequence
b) Pipeline stages appear in an multi dimensional array
c) $project reshapes each document in the stream, such as by adding new fields or removing existing fields
d) All of the mentioned
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3. Which of the following can be used to implement field level redaction?
a) $skip
b) $limit
c) $match
d) $redact
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4. ________ passes the first n documents unmodified to the pipeline where n is the specified limit.
a) $skip
b) $limit
c) $match
d) $redact
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5. _______ reorders the document stream by a specified sort key.
a) $skip
b) $limit
c) $sort
d) None of the mentioned
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6. Which of the following operator incorporates the functionality of $match, $sort, and $limit for geospatial data?
a) $geoSpatial
b) $geoNear
c) $geoRear
d) None of the mentioned
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7. _____ Writes the resulting documents of the aggregation pipeline to a collection.
a) $out
b) $in
c) $output
d) None of the mentioned
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8. ________ deconstructs an array field from the input documents to output a document for each element.
a) $unwindelem
b) $unwind
c) $unwin
d) None of the mentioned
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9. Which of the following operator is related to geography of data?
a) $geoSpatial
b) $geoNear
c) $geoRear
d) None of the mentioned
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Sanfoundry Global Education & Learning Series – MongoDB.

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