MongoDB Questions and Answers – Index Types – 3

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This set of MongoDB Aptitude Test focuses on “Index Types – 3”.

1. Which of the following GeoJSON object is not supported in MongoDB?
a) Point
b) LineString
c) MultiPoint
d) None of the mentioned
View Answer

Answer: d
Explanation: In version 2.2 and newer, capped collections do have an _id field, except those in the local database.

2. Point out the wrong statement.
a) MongoDB can query for locations contained entirely within a specified polygon
b) MongoDB require an index for inclusion queries; however, such indexes will improve query performance
c) Indexes on embedded fields allow you to use a “dot notation,” to introspect into embedded documents
d) None of the mentioned
View Answer

Answer: b
Explanation: Both 2d and 2dsphere indexes can support inclusion queries.

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3. MongoDB supports spherical surface calculations on legacy coordinate pairs using a _______ index.
a) 2dsphere
b) 2d
c) geoHaystack
d) all of the mentioned
View Answer

Answer: a
Explanation: If you choose flat surface calculations via a 2d index, you can store data only as legacy coordinate pairs.

4. Inclusion queries use the _________ operator in MongoDB.
a) $geokey
b) $geoin
c) $geoWithin
d) All of the mentioned
View Answer

Answer: c
Explanation: $geoWithin selects documents with geospatial data that exists entirely within a specified shape.

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5. Point out the correct statement.
a) For $geoSphere queries that specify GeoJSON geometries with areas greater than a single hemisphere, the use of the default CRS results in queries for the complementary geometries
b) When determining inclusion, MongoDB considers the border of a shape to be part of the shape, subject to the precision of floating point numbers
c) The custom MongoDB CRS uses a anti-clockwise winding order
d) None of the mentioned
View Answer

Answer: b
Explanation: The specified shape can be either a GeoJSON Polygon, a GeoJSON MultiPolygon, or a shape defined by legacy coordinate pairs.

6. The $geoWithin operator uses the _______ operator to specify the GeoJSON object.
a) $sphere
b) $geoin
c) $geometry
d) All of the mentioned
View Answer

Answer: c
Explanation: For $geoWithin, if you specify a single-ringed polygon that has an area greater than a single hemisphere, include the custom MongoDB coordinate reference system in the $geometry expression.

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7. 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.
a) smaller
b) bigger
c) equal
d) all of the mentioned
View Answer

Answer: a
Explanation: For all other GeoJSON polygons with areas greater than a hemisphere, $geoWithin queries for the complementary geometry.

8. To query with a single-ringed GeoJSON polygon whose area is greater than a single hemisphere, the $geometry expression must specify the custom MongoDB ________
a) CRS
b) CDS
c) CLS
d) None of the mentioned
View Answer

Answer: a
Explanation: CRS stands for coordinate reference system.

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9. $geoWithin replaces _______ in MongoDB 2.4.
a) $withing
b) $gwithin
c) $within
d) All of the mentioned
View Answer

Answer: c
Explanation: $within is deprecated since version 2.4.

10. When used with the _____ operator, $geoWithin returns documents based on grid coordinates and does not query for GeoJSON shapes.
a) $box
b) $circle
c) $shape
d) All of the mentioned
View Answer

Answer: a
Explanation: $box specifies a rectangle for a geospatial $geoWithin query to return documents that are within the bounds of the rectangle, according to their point-based location data.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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