MongoDB Questions and Answers – Pipeline Operators – 1

This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Pipeline Operators – 1”.

1. $dayOfMonth returns the day of the month for a date as a number between ________________
a) 1 and 31
b) 1 and 30
c) 1 and 28
d) None of the mentioned
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2. Point out the wrong statement.
a) $second returns the seconds for a date as a number between 0 and 60 (leap seconds)
b) $minute returns the minute for a date as a number between 0 and 59
c) $millis returns the milliseconds of a date as a number between 0 and 1000
d) All of the mentioned
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3. __________ returns the day of the year for a date as a number between 1 and 366.
a) $dayofWeekend
b) $dayOfWeek
c) $dayOfYear
d) None of the mentioned
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4. Which of the following returns year for particular date?
a) $year
b) $yearday
c) $syearofmonth
d) None of the mentioned
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5. Point out the wrong statement.
a) $weekDay returns the week number for a date as a number between 0 and 53 (leap year)
b) $cond accepts either two expressions in an ordered list or three named parameters
c) $toLower only has a well-defined behavior for strings of ASCII characters
d) None of the mentioned
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6. Which of the following returns the hour for a date as a number between 0 and 23?
a) $minute
b) $hour
c) $seconds
d) All of the mentioned
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7. __________ returns the date as a formatted string.
a) $toString
b) $dateToString
c) $letString
d) None of the mentioned
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8. _______ result encompasses instances of undefined values or missing fields.
a) Number
b) String
c) Null
d) None of the mentioned
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9. ___________ returns either the non-null result of the first expression.
a) $Null
b) $ifNull
c) $ElseNull
d) None of the mentioned
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10. __________ take as input a single expression, evaluating the expression once for each input document, and maintain their state for the group of documents.
a) Computer
b) Monitors
c) Accumulators
d) Performoner
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