Data Science MCQs with answers Page - 12

Here, you will find a collection of MCQ questions on Data Science. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. Which of the following function is used for casting data frames?

  • (A) dcast
  • (B) ucast
  • (C) rcast
  • (D) all of the mentioned

A

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Q. Extracting XML is the basis for most web scraping.

  • (A) True
  • (B) right
  • (C) ---
  • (D) ---

A

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Q. Which of the following join is by default used in plyr package?

  • (A) left
  • (B) json
  • (C) full
  • (D) all of the mentioned

A

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Q. Which of the following package is used for reading JSON data?

  • (A) jsonlite
  • (B) eggy data
  • (C) jsondata
  • (D) all of the mentioned

A

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Q. Which of the following is another name for raw data?

  • (A) destination data
  • (B) @
  • (C) secondary
  • (D) machine learning

A

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Q. Which of the following metacharacter is used to refer to any character?

  • (A) %
  • (B) all
  • (C) .
  • (D) All of the mentioned

A

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Q. Which of the following function is used for determining missing values?

  • (A) any
  • (B) each observation in different row
  • (C) is
  • (D) all of the mentioned

A

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Q. Which of the following is a trait of tidy data?

  • (A) each variable in one column
  • (B) Common variables are used to cutting up quantitative variables
  • (C) one table for each kind of variable
  • (D) none of the mentioned

A

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Q. Point out the wrong statement.

  • (A) Common variables are used to create missingness vector
  • (B) cos
  • (C) Common variables are not used to apply transforms
  • (D) All of the mentioned

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Q. Processing data includes subsetting, formatting and merging only.

  • (A) True
  • (B) Nearly 20% of data analysis is spent on data dredging
  • (C) ---
  • (D) ---

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