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 a concepts of one to many. Encapsulation
Polymorphism
Abstraction
Inheritance

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

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3. Response variable is represented on ___________ none of them
both x-axis and y-axis
y-axis
x-axis

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

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

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6. The lapply() function takes ___________, ____________ and __________ as input. Array, List, Matrix
None of them
Data Frame, Array
List, Vector and Data Frame

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

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8. The layers in ggplot2 are called ___________. adds on
geoms
levels
sheets

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9. which function converts list to a vector? none of them
cnvert_list()
de_list()
unlist()

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10. How to installed packages in R? Library(packagename)
Install.packages(packagenames)
require(packagename)
install(packagename)

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