Test Your Programming Skills with Safcode!

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Here is all important interview / exams questions.
Student doing practice apptitude test on safcode platform.
Instruction: "Total Number of Questions: 20
Each question carry 10 mark , no negative marking"

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Quiz Start

1. _____________ is not a type of operator in R. Relational
Assignment
Mathematical
Logical

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2. The function that is used to extract or replace substrings in a character vector in ____________ substr()
string()
subchar()
sub_string()

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3. How are null entries in a data frame denoted in R? n/a
None of these
na
NaN

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4. Response variable is represented on _______________ no axis
x-axis
y-axis
both x-axis and y-axis

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5. The __________ function is used to sort the values of column in ascending or descending order. arrange()
manage()
mutate()
sort()

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6. ____________ is the raw collection of records, contents and images. Data frame
Matrix
Tables
Data

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7. ___________ is a concepts of one to many. Abstraction
Encapsulation
Inheritance
Polymorphism

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8. The __________ function is used to group data frame. summerize()
group_by()
List()
matrix()

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9. Histograms are good to display the _________ of the data. Mean
Median
Mode
Quartile

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10. ___________ returns a character vector of the same length and with the same attributes as x. grep()
gsub()
regexp()
paste()

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