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