Pandas MCQs with answers Page - 3

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Q. What is the default number of rows displayed by the `df.head()` method?

  • (A) 3
  • (B) 5
  • (C) 10
  • (D) 1

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Q. Which method is used to reset the index of a DataFrame?

  • (A) df.set_index()
  • (B) df.index_reset()
  • (C) df.reset_index()
  • (D) df.restart_index()

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Q. How to select rows where column 'A' is greater than 10?

  • (A) df['A'] > 10
  • (B) df[df['A'] > 10]
  • (C) df.select('A' > 10)
  • (D) df.where('A' > 10)

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Q. Which of the following methods is used to apply a function to each element in a column?

  • (A) map()
  • (B) apply()
  • (C) applymap()
  • (D) transform()

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Q. What does `groupby()` do in pandas?

  • (A) It joins multiple DataFrames
  • (B) It applies a function to grouped data
  • (C) It merges duplicate rows
  • (D) It deletes empty rows

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Q. How to change the data type of a column in pandas?

  • (A) df.astype()
  • (B) df.change_type()
  • (C) df.convert()
  • (D) df.set_type()

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Q. What does `drop(columns=['col1'])` do?

  • (A) Deletes the 'col1' row
  • (B) Deletes the 'col1' column
  • (C) Renames 'col1'
  • (D) Sorts 'col1'

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Q. What is the output of `df.iloc[2]`?

  • (A) Column at index 2
  • (B) Row at label 2
  • (C) Row at index 2
  • (D) All rows starting from index 2

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Q. Which method allows you to perform element-wise operations on the entire DataFrame?

  • (A) applymap()
  • (B) map()
  • (C) apply()
  • (D) transform()

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Q. How to convert a column to datetime format?

  • (A) pd.to_datetime(df['col'])
  • (B) df['col'].astype('date')
  • (C) df['col'].to_date()
  • (D) pd.date(df['col'])

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