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

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

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3. OOP stands for? Object Oriented Programming
Orange Oriented Pixels
Option Object Programming
Object of Program

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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. The __________ function is used to select data by its column names. fetch()
select()
all of them
retrieve()

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6. What is the memory limit in R? 2TB
8TB
6TB
4TB

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7. Which function is used to add regression line to the scatter plot. abs_line()
abline()
smooth()
None of them

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

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9. When the explanatory variable is categorical, then _____________ graph is used. None of these
pie chart
scatter plot
box plot

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10. R is an__________programming language? GPL
None of above
Close Source
Open Source

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11. The vertical dashed lines in the boxplot are known as ______________. Notches
Outliers
Whiskers
Tails

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

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

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14. ___________ is called the positional average of any data. mode
quartiles
mean
median

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15. __________ is the first step of data science life cycle. Data Modeling
Data Acquisition
Business Understanding
Model Deployment

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16. The estimate of any population is called ___________ Guess
Subset
Statistics
Sampling

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

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18. Which one is not a step of Data Preparation process. None of the Them
Remove Duplicate Entries
Feature Selection
Missing Values

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

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20. Heavy data ranging from petabytes or exabytes is called ___________. Heavy Data
Big Data
Huge Data
Large Data

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