MongoDB Questions and Answers – ObjectId

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

1. Object_Id is similar to _________ key in Relational Databases.
a) primary
b) secondary
c) composite
d) all of the mentioned
View Answer

2. Which of the field is reserved for use as a primary key?
a) _id
b) _uid
c) _uuid
d) All of the mentioned
View Answer

3. Point out the wrong statement.
a) The field names cannot start with the dollar sign ($) character
b) The field names cannot contain the dot (.) character
c) The field names cannot contain the null character
d) None of the mentioned
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4. To ensure functioning replication, do not store values that are of the _______ regular expression type in the _id field.
a) JSON
b) XML
c) JScript
d) None of the mentioned
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5. The ______ field is always the first field in the document.
a) _id
b) id
c) Ob_id
d) None of the mentioned
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6. __________ returns the JavaScript representation in the form of a string literal.
a) toStringJava()
b) toString()
c) String()
d) none of the mentioned
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7. Which of the following query is used to generate a new ObjectId, use the ObjectId() constructor with no argument?
a) x = ObjectIdAdd()
b) x = addObjectId()
c) x = ObjectId()
d) none of the mentioned
View Answer

Sanfoundry Global Education & Learning Series – MongoDB.

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