MongoDB MongoDB Query Language and Operators 2

Question 1

What does the $exists operator check in a MongoDB query?

Accepted Answer

Whether a specified field is present in the document

Answer

Whether a field value is null

Answer

Whether a document exists in the collection

Answer

Whether an index exists on a field

Question 2

Which MongoDB operator enables full-text search on fields that have a text index?

Accepted Answer

$text

Answer

$regex

Answer

$search

Answer

$like

Question 3

What does the $or operator return in a MongoDB query?

Accepted Answer

Documents where at least one condition is true

Answer

Documents where all conditions are true

Answer

Documents where exactly one condition is true

Answer

Documents where none of the conditions are true

Question 4

Which MongoDB operator matches documents where a field value matches a given regular expression pattern?

Accepted Answer

$regex

Answer

$like

Answer

$match

Answer

$pattern

Question 5

What does the $type operator do in a MongoDB query?

Accepted Answer

Matches documents where a field is of a specified BSON type

Answer

Converts a field to a different BSON type

Answer

Returns the type of a field as a string

Answer

Creates a typed index on a field

Question 6

What does the $nor operator do in a MongoDB query?

Accepted Answer

Returns documents that fail all of the specified conditions

Answer

Returns documents matching all specified conditions

Answer

Returns documents matching at least one condition

Answer

Returns documents matching exactly one condition

Question 7

Which operator is used to skip a specified number of documents in a MongoDB query result?

Accepted Answer

.skip(n)

Answer

.offset(n)

Answer

.start(n)

Answer

.from(n)