Avatto > DATA SCIENTIST > PRACTICE QUESTIONS > R for Data Analytics > Data Manipulation with R

R for Data Analytics MCQ - Data Manipulation with R

1 Which function displays the internal structure of an R object?

The str() function provides a compact display of the internal structure of an R object, including its type, dimensions and components.

2 Which operator is commonly used to access a named column of a data frame in R?

The $ operator can access a named component or column, such as df$Age.

3 Which function is commonly used to select rows of a data frame using a logical condition?

subset() provides a convenient way to select rows and columns using conditions.

4 Which function combines two data frames using common columns or specified keys?

merge() combines data frames based on common column names or explicitly specified key columns.

5 Which function combines data frames by rows when they have compatible columns?

rbind() stacks objects vertically by adding rows.

Subtopics Covered

View All Subtopics

Quick Links

Difficulty Distribution

Easy 0%
Medium 0%
Hard 0%

Upcoming Papers

UPCOMING -- DATE PENDING

Data Scientist is a professional role rather than a single standardized examination. Candidates are recruited through individual organization-specific exams, university qualifications, or professional certifications. The day countdown will appear automatically after the API provides an exact official exam date.

Your Progress

0%

Start Practising!

You've answered 0 of 22 questions in this topic.

Practice Spotlight

lapply and sapply

lapply() consistently returns a list, while sapply() attempts to simplify results into vectors or matrices. This return-type difference is frequently tested.

Day 4 / 10

Global Spotlight

Challenge Your Accuracy

Strong work at 0% accuracy. Attempt the hardest Data Manipulation with R questions and explain why every incorrect option is wrong.

Day 6 / 10

Question Spotlight

Question:

Which function combines objects side by side as columns?

A. rbind()
B. cbind()
C. merge.rows()
D. stackrows()

Correct answer: B

Explanation:

cbind() combines objects by columns.

Click to view the complete question details

Day 2 / 10 Open this question

Community Insight

Based on 7 saved attempts

Most Attempted TopicAdvanced R Programming
Most Challenging TopicAdvanced R Programming
Average Accuracy29%

Featured Question

(Based on recent community answers)

Q. #35670100% Incorrect

Which function is most appropriate for applying a function to every element of a list…

Try This Question →

This Week's Challenge

Complete 20 questions and set the community benchmark!

0 / 20 Start Challenge →

Why Practice with Avatto?

High Quality MCQsExam-focused questions with accurate answers

Detailed ExplanationsStep-by-step explanations to enhance learning

Latest Exam PatternBased on updated syllabus and pattern

Performance AnalyticsTrack performance and improve weak areas

100% Free PracticePractice unlimited questions for free

Forgot your password?

I agree with the Terms.