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MongoDB CRUD Operations Flashcards

6 cards from real MongoDB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 MongoDB CRUD Operations flashcards as text

  1. Which query operator selects documents where the field value is within a specified array?

    Answer: $in

    $in matches documents where the field's value equals any value in the provided array.

  2. What does the $push operator do in MongoDB?

    Answer: Appends a value to an array field

    $push appends a specified value to an array field, creating the array if it does not exist.

  3. Which method is used to retrieve all documents matching a query in MongoDB?

    Answer: find()

    find() returns a cursor to all documents matching the query filter, or all documents if no filter is provided.

  4. How do you limit the number of documents returned by a query in MongoDB?

    Answer: find().limit(5)

    The limit() cursor method restricts the number of documents returned to the specified count.

  5. What operator is used to match documents where a field value is NOT equal to a specified value?

    Answer: $ne

    $ne (not equal) selects documents where the field value is not equal to the specified value, including documents without that field.

  6. Which update operator removes a field from a document?

    Answer: $unset

    $unset removes the specified field from a document, and if the field does not exist, the operation is a no-op.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. 10geneducation.zendesk.com — Test dates, score release, passing score, test delivery, retake policy · verified Oct 2026
  2. learn.mongodb.com — Eligibility, fees, exam format, time limit · verified Oct 2026