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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. The lapply() function takes ___________, ____________ and __________ as input.
Array, List, Matrix
None of them
List, Vector and Data Frame
Data Frame, Array
View Answer
2. The layers in ggplot2 are called ___________.
levels
sheets
adds on
geoms
View Answer
3. OOP stands for?
Object Oriented Programming
Orange Oriented Pixels
Option Object Programming
Object of Program
View Answer
4. The function that is used to extract or replace substrings in a character vector in ____________
sub_string()
string()
subchar()
substr()
View Answer
5. The __________ function is used to select data by its column names.
fetch()
select()
all of them
retrieve()
View Answer
6. What is the memory limit in R?
2TB
8TB
6TB
4TB
View Answer
7. Which function is used to add regression line to the scatter plot.
abs_line()
abline()
smooth()
None of them
View Answer
8. ___________ is a concepts of one to many.
Abstraction
Encapsulation
Inheritance
Polymorphism
View Answer
9. When the explanatory variable is categorical, then _____________ graph is used.
None of these
pie chart
scatter plot
box plot
View Answer
10. R is an__________programming language?
GPL
None of above
Close Source
Open Source
View Answer
11. The vertical dashed lines in the boxplot are known as ______________.
Notches
Outliers
Whiskers
Tails
View Answer
12. ___________ returns a character vector of the same length and with the same attributes as x.
paste()
gsub()
regexp()
grep()
View Answer
13. Response variable is represented on _______________
y-axis
both x-axis and y-axis
no axis
x-axis
View Answer
14. ___________ is called the positional average of any data.
mode
quartiles
mean
median
View Answer
15. __________ is the first step of data science life cycle.
Data Modeling
Data Acquisition
Business Understanding
Model Deployment
View Answer
16. The estimate of any population is called ___________
Guess
Subset
Statistics
Sampling
View Answer
17. How to installed packages in R?
install(packagename)
Library(packagename)
require(packagename)
Install.packages(packagenames)
View Answer
18. Which one is not a step of Data Preparation process.
None of the Them
Remove Duplicate Entries
Feature Selection
Missing Values
View Answer
19. Response variable is represented on ___________
y-axis
none of them
both x-axis and y-axis
x-axis
View Answer
20. Heavy data ranging from petabytes or exabytes is called ___________.
Heavy Data
Big Data
Huge Data
Large Data
View Answer