MongoDB interview questions part 18
MongoDB interview questions part 18
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Total Questions: 20
1. Before version _______ capped collections did not have an _id field.
Correct Answer is : 2.2
2. Point out the wrong statement :
Correct Answer is : Indexes on embedded fields allow you to use a “dot notation,” to introspect into embedded documents
3. For a _____ multikey index, each indexed document can have at most one indexed field whose value is an array.
Correct Answer is : compound
4. Which of the following indexes cannot be multikey ?
Correct Answer is : Hashed
5. Point out the wrong statement :
Correct Answer is : You will receive a warning if you attempt to create a compound index that includes a hashed index
6. To calculate geometry over an Earth-like sphere, store your location data on a spherical surface and use _____ index.
Correct Answer is : 2dsphere
7. ______ indexes can be constructed over arrays that hold both scalar values (e.g. strings, numbers) and nested documents.
Correct Answer is : Multikey
8. The coordinate reference system for GeoJSON uses the _____ datum.
Correct Answer is : WGS84
9. Which of the following is used to calculate distances on a Euclidean plane ?
Correct Answer is : 2d
10. Queries on ________ objects always calculate on a sphere.
Correct Answer is : GeoJSON
11. Which of the following GeoJSON object is not supported in MongoDB ?
Correct Answer is : None of the mentioned
12. Point out the wrong statement :
Correct Answer is : MongoDB require an index for inclusion queries; however, such indexes will improve query performance
13. MongoDB supports spherical surface calculations on legacy coordinate pairs using a _______ index
Correct Answer is : 2dsphere
14. Inclusion queries use the _________ operator in MongoDB.
Correct Answer is : $geoWithin
15. Point out the correct statement :
Correct Answer is : When determining inclusion, MongoDB considers the border of a shape to be part of the shape, subject to the precision of floating point numbers
16. The $geoWithin operator uses the _______ operator to specify the GeoJSON object.
Correct Answer is : $geometry
17. If the specified polygon is _______ than a single hemisphere, the behavior of $geoWithin with the MongoDB CRS is the same as with the default CRS
Correct Answer is : smaller
18. To query with a single-ringed GeoJSON polygon whose area is greater than a single hemisphere, the $geometry expression must specify the custom MongoDB ________
Correct Answer is : CRS
19. $geoWithin replaces _______ in MongoDB 2.4.
Correct Answer is : $within
20. When used with the _____ operator, $geoWithin returns documents based on grid coordinates and does not query for GeoJSON shapes.
Correct Answer is : $box
