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Test Your Programming Skills with Safcode!
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"
Quiz Start
1. ___________ returns a character vector of the same length and with the same attributes as x.
gsub()
regexp()
paste()
grep()
View Answer
2. Response variable is represented on ___________
x-axis
y-axis
both x-axis and y-axis
none of them
View Answer
3. Response variable is represented on _______________
x-axis
both x-axis and y-axis
no axis
y-axis
View Answer
4. Which one is not a step of Data Preparation process.
Feature Selection
None of the Them
Remove Duplicate Entries
Missing Values
View Answer
5. The lapply() function takes ___________, ____________ and __________ as input.
None of them
Data Frame, Array
Array, List, Matrix
List, Vector and Data Frame
View Answer
6. The __________ function is used to sort the values of column in ascending or descending order.
manage()
arrange()
mutate()
sort()
View Answer
7. When the explanatory variable is categorical, then _____________ graph is used.
box plot
None of these
pie chart
scatter plot
View Answer
8. Histograms are good to display the _________ of the data.
Median
Quartile
Mode
Mean
View Answer
9. OOP stands for?
Orange Oriented Pixels
Option Object Programming
Object Oriented Programming
Object of Program
View Answer
10. _____________ is an open source R package that provides an elegant and powerful Web framework for building Web applications.
Dash
Ggplot2
Leaflet
Shiny
View Answer
11. Heavy data ranging from petabytes or exabytes is called ___________.
Huge Data
Large Data
Heavy Data
Big Data
View Answer
12. Which function is used to add regression line to the scatter plot.
smooth()
abs_line()
abline()
None of them
View Answer
13. What is the function used to read CSV files into R?
csv()
read_csv()
readfile()
read()
View Answer
14. How are null entries in a data frame denoted in R?
NaN
n/a
na
None of these
View Answer
15. How to installed packages in R?
install(packagename)
require(packagename)
Install.packages(packagenames)
Library(packagename)
View Answer
16. The layers in ggplot2 are called ___________.
geoms
sheets
levels
adds on
View Answer
17. How to visualize data in Pie Chart?
pipe
piechart
package
pie
View Answer
18. The __________ function is used to select data by its column names.
all of them
retrieve()
fetch()
select()
View Answer
19. The estimate of any population is called ___________
Subset
Guess
Sampling
Statistics
View Answer
20. The vertical dashed lines in the boxplot are known as ______________.
Whiskers
Outliers
Tails
Notches
View Answer