101. Which command imports BSON data into MongoDB?

• a) mongorestore
• b) mongoimport
• c) loadbson
• d) db.import()

102. What is the purpose of the $hour operator?

• a) Extracts hour from date (0-23)
• b) Converts to hourly averages
• c) Creates time buckets
• d) Measures hour intervals

103. Which method creates a MongoDB Atlas cluster?

• a) Atlas UI/API only
• b) db.createAtlasCluster()
• c) mongod --atlas
• d) db.makeCluster()

104. What does the $literal operator do?

• a) Prevents parsing of special characters
• b) Creates literal strings
• c) Validates JSON syntax
• d) Escapes BSON

105. Which operator performs set intersection?

• a) $setIntersection
• b) $intersect
• c) $common
• d) $and

106. What is the purpose of the $indexOfArray operator?

• a) Finds first position of element in array
• b) Creates array indexes
• c) Validates array contents
• d) Counts array occurrences

107. Which command enables MongoDB profiling?

• a) db.setProfilingLevel(2)
• b) db.enableProfiling()
• c) mongod --profile
• d) profile.start()

108. What does the $reverseArray operator do?

• a) Reverses element order
• b) Creates mirrored arrays
• c) Validates array sequence
• d) Undoes array operations

109. Which method creates a MongoDB client session?

• a) MongoClient.startSession()
• b) db.startSession()
• c) session.create()
• d) db.clientSession()

110. What is the purpose of the $dateDiff operator?

• a) Calculates time between two dates
• b) Formats date differences
• c) Validates date ranges
• d) Converts timezones

111. Which operator implements set difference?

• a) $setDifference
• b) $diff
• c) $subtractArrays
• d) $minus

112. What does the $first operator return in $group?

• a) First document's value per group
• b) First array element
• c) Earliest timestamp
• d) First matching document

113. Which command lists MongoDB's available commands?

• a) db.listCommands()
• b) show commands
• c) db.help()
• d) db.commands()

114. What is the purpose of the $zip operator?

• a) Merges arrays element-wise
• b) Compresses data
• c) Creates archive files
• d) Encodes BSON

115. Which operator checks if a value is in an array?

• a) $in
• b) $has
• c) $contains
• d) $within

116. What does the $min operator do in $group?

• a) Returns the smallest value per group
• b) Filters minimum values
• c) Sets lower bounds
• d) Validates ranges

117. Which method returns MongoDB's build info?

• a) db.version()
• b) db.buildInfo()
• c) mongod --version
• d) db.serverBuildInfo()

118. What is the purpose of the $reduce operator?

• a) Applies an expression to each array element cumulatively
• b) Shrinks document size
• c) Optimizes storage
• d) Decreases array length

119. Which operator implements set equality?

• a) $setEquals
• b) $arrayEqual
• c) $same
• d) $equalSets

120. What does the $ltrim operator do?

• a) Removes whitespace from string start
• b) Trims arrays
• c) Left-aligns text
• d) Limits document size