MongoDB Questions and Answers – Index Types – 2

This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Index Types – 2”.

1. Before version _______ capped collections did not have an _id field.
a) 2.1
b) 2.4
c) 3.0
d) 2.2
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2. Point out the wrong statement.
a) You can create indexes on fields within embedded documents
b) Indexes on embedded fields are similar to indexes on embedded documents
c) Indexes on embedded fields allow you to use a “dot notation,” to introspect into embedded documents
d) None of the mentioned
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3. For a _____ multikey index, each indexed document can have at most one indexed field whose value is an array.
a) Hashed
b) Unique
c) Multikey
d) compound
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4. Which of the following indexes cannot be multikey?
a) Hashed
b) Unique
c) Multikey
d) compound
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5. Point out the wrong statement.
a) You may not create compound indexes that have hashed index fields
b) The order of the fields in a compound index is very important
c) You will receive a warning if you attempt to create a compound index that includes a hashed index
d) None of the mentioned
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6. To calculate geometry over an Earth-like sphere, store your location data on a spherical surface and use _____ index.
a) 2dsphere
b) 2d
c) geoHaystack
d) all of the mentioned
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7. ______ indexes can be constructed over arrays that hold both scalar values (e.g. strings, numbers) and nested documents.
a) Hashed
b) Unique
c) Multikey
d) Compound
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8. The coordinate reference system for GeoJSON uses the _____ datum.
a) WGS88
b) WGS84
c) JGS88
d) None of the mentioned
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9. Which of the following is used to calculate distances on a Euclidean plane?
a) 2dsph
b) 2d
c) geoHaystack
d) all of the mentioned
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10. Queries on ________ objects always calculate on a sphere.
a) GeoBSON
b) GeoJSON
c) geoJSONB
d) All of the mentioned
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