Pandas MCQs with answers Page - 7

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Q. Which method allows you to fill NaN values with the previous non-null value?

  • (A) fillna(method='forward')
  • (B) fillna(method='ffill')
  • (C) fillna(method='bfill')
  • (D) fillna(method='pad')

A

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Q. What does `df.duplicated().sum()` return?

  • (A) Total duplicate values in the DataFrame
  • (B) Total duplicate rows in the DataFrame
  • (C) Total NaN values
  • (D) Number of rows

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Q. Which method sets a specific column as the index of a DataFrame?

  • (A) set_index()
  • (B) make_index()
  • (C) create_index()
  • (D) index_col()

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Q. How can you reset a DataFrame index without keeping the old one?

  • (A) reset_index()
  • (B) reset_index(drop=True)
  • (C) reset_index(inplace=True)
  • (D) drop_index()

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Q. Which method finds the cumulative sum of a column?

  • (A) sum()
  • (B) cumsum()
  • (C) cumulativesum()
  • (D) accumulate()

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Q. What does `df['col'].str.contains('abc')` return?

  • (A) A filtered DataFrame with 'abc'
  • (B) Boolean Series where each element tells if 'abc' exists
  • (C) List of all values that contain 'abc'
  • (D) Index of matching rows

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Q. Which method groups data and returns the size of each group?

  • (A) groupby().count()
  • (B) groupby().sum()
  • (C) groupby().size()
  • (D) groupby().value_counts()

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Q. Which of the following creates a DataFrame from a list of dictionaries?

  • (A) pd.DataFrame.from_dict(list_of_dicts)
  • (B) pd.DataFrame(list_of_dicts)
  • (C) pd.Series(list_of_dicts)
  • (D) pd.DictFrame(list_of_dicts)

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Q. Which method returns the number of dimensions in a DataFrame?

  • (A) df.ndim
  • (B) df.shape
  • (C) df.len()
  • (D) df.columns

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Q. Which parameter of `groupby()` is used to avoid setting the grouped column as index?

  • (A) reset_index=True
  • (B) index=False
  • (C) as_index=False
  • (D) drop_index=True

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