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PYTHON – PANDAS SERIES (MCQs)
Q1. Which of the following is used to create a Pandas Series?
A. pd.series()
B. pd.Series()
C. pd.createSeries()
D. pd.makeSeries()
✅ Answer: B (pd.Series())
Q2. A Pandas Series is a:
A. 2-dimensional array
B. 3-dimensional array
C. 1-dimensional labeled array
D. Unlabeled array
✅ Answer: C (1-dimensional labeled array)
Q3. Which library must be imported to use Pandas Series?
A. numpy
B. pandas
C. matplotlib
D. seaborn
✅ Answer: B (pandas)
Q4. What will be the output of the following code?
A. 10
B. 20
C. 30
D. Error
✅ Answer: B (20)
Q5. What are the default index values of a Pandas Series?
A. 1, 2, 3
B. a, b, c
C. 0, 1, 2
D. None
✅ Answer: C (0, 1, 2)
Q6. Which of the following can be used as data for a Pandas Series?
A. List
B. Dictionary
C. NumPy array
D. All of the above
✅ Answer: D (All of the above)
Q7. How do you create a Series with custom index?
A. pd.Series(data, index=labels)
B. pd.Series(data, labels)
C. pd.Series(index, data)
D. pd.Series(labels=data)
✅ Answer: A
Q8. What will be the output of the following code?
A. 10
B. 20
C. 30
D. Error
✅ Answer: B (20)
Q9. Which attribute is used to get values of a Series?
A. values()
B. value
C. values
D. getValues()
✅ Answer: C (values)
Q10. Which attribute is used to get index of a Series?
A. indexes
B. index
C. idx
D. keys
✅ Answer: B (index)
Q11. What happens if you access an index that does not exist in a Series?
A. Returns 0
B. Returns None
C. Raises KeyError
D. Ignores
✅ Answer: C (KeyError)
Q12. Which function is used to display first few elements of a Series?
A. start()
B. begin()
C. head()
D. top()
✅ Answer: C (head())
Q13. Which parameter is used to assign a name to a Pandas Series?
A. label
B. title
C. name
D. id
✅ Answer: C (name)
Q14. What will be the output?
A. 5
B. 10
C. 15
D. Error
✅ Answer: C (15)
Q15. Which of the following creates an empty Series?
A. pd.Series()
B. pd.Series([])
C. Both A and B
D. None of these
✅ Answer: C (Both A and B)
Q16. What is the default data type of a Series created with integers?
A. int32
B. int64
C. float32
D. object
✅ Answer: B (int64)
Q17. Which attribute returns both index and values together?
A. items()
B. pairs()
C. elements()
D. combine()
✅ Answer: A (items())
Q18. What will be the output?
A. 3
B. 5
C. 6
D. Error
✅ Answer: C (6)
Q19. Which method is used to check missing values in a Series?
A. isnull()
B. checknull()
C. missing()
D. null()
✅ Answer: A (isnull())
Q20. Which of the following replaces missing values in a Series?
A. fill()
B. replace()
C. fillna()
D. dropna()
✅ Answer: C (fillna())
🖥️ OUTPUT-BASED QUESTIONS
Q21. What will be the output?
✅ Answer:
Q22. What will be the output?
✅ Answer:
Q23. What will be the output?
✅ Answer:
Q24. What will be the output?
A. 10
B. 15
C. 30
D. Error
✅ Answer: A (10)
Q25. What does dropna() do in a Pandas Series?
A. Deletes the Series
B. Removes missing values
C. Replaces missing values
D. Sorts data
✅ Answer: B (Removes missing values)
Q26. Pandas Series stores data in the form of:
A. Rows
B. Columns
C. Values with index
D. Tables
✅ Ans: C
Q27. Which statement is true about Pandas Series?
A. Mutable
B. Immutable
C. Fixed size
D. Two dimensional
✅ Ans: A
Q28. What is returned by s.dtype?
A. Values
B. Index
C. Data type
D. Shape
✅ Ans: C
Q29. Which function converts a Series to a list?
A. tolist()
B. list()
C. to_list()
D. Both A and C
✅ Ans: D
Q30. Which index type is default in Series?
A. String
B. Float
C. Integer
D. Boolean
✅ Ans: C
Q31. Which operator is used for element-wise addition?
A. +
B. add()
C. sum()
D. Both A and B
✅ Ans: D
Q32. What does len(s) return?
A. Sum of values
B. Size of Series
C. Index
D. Data type
✅ Ans: B
Q33. Which method sorts Series values?
A. sort()
B. sort_values()
C. order()
D. arrange()
✅ Ans: B
Q34. Which method sorts Series by index?
A. sort_index()
B. sort_values()
C. index_sort()
D. reindex()
✅ Ans: A
Q35. What does s.shape return?
A. Index
B. Values
C. Tuple of size
D. Data type
✅ Ans: C
Q36. Which function removes NaN values?
A. fillna()
B. isna()
C. dropna()
D. removena()
✅ Ans: C
Q37. What is NaN?
A. Zero
B. Null value
C. Error
D. String
✅ Ans: B
Q38. Which function counts non-NaN values?
A. count()
B. size()
C. len()
D. sum()
✅ Ans: A
Q39. What does s.size return?
A. Number of non-null values
B. Total elements
C. Index
D. Data type
✅ Ans: B
Q40. Which function returns maximum value?
A. top()
B. max()
C. highest()
D. upper()
✅ Ans: B
Q41. Which function returns minimum value?
A. min()
B. low()
C. bottom()
D. least()
✅ Ans: A
Q42. Which method gives cumulative sum?
A. sum()
B. cumsum()
C. accumulate()
D. total()
✅ Ans: B
Q43. Which function checks unique values?
A. unique()
B. nunique()
C. distinct()
D. different()
✅ Ans: A
Q44. Which returns number of unique values?
A. unique()
B. count()
C. nunique()
D. size()
✅ Ans: C
Q45. Which attribute displays Series name?
A. title
B. label
C. name
D. id
✅ Ans: C
Q46. Which method returns last elements?
A. tail()
B. end()
C. last()
D. finish()
✅ Ans: A
Q47. Which method replaces values?
A. fillna()
B. replace()
C. swap()
D. change()
✅ Ans: B
Q48. What does s.index return?
A. Values
B. Data type
C. Index labels
D. Size
✅ Ans: C
Q49. Boolean indexing is used for:
A. Sorting
B. Filtering data
C. Merging
D. Indexing only
✅ Ans: B
Q50. Which creates Series from dictionary?
A. pd.Series(dict)
B. pd.series(dict)
C. pd.make(dict)
D. pd.data(dict)
✅ Ans: A
Q51. Which method converts Series to NumPy array?
A. array()
B. values
C. to_numpy()
D. Both B and C
✅ Ans: D
Q52. Which function returns first valid index?
A. first()
B. idxmax()
C. first_valid_index()
D. head()
✅ Ans: C
Q53. Which function returns index of max value?
A. max()
B. idxmax()
C. argmax()
D. locmax()
✅ Ans: B
Q54. Which function returns index of min value?
A. idxmin()
B. min()
C. argmin()
D. locmin()
✅ Ans: A
Q55. Which function checks duplicate values?
A. duplicate()
B. duplicated()
C. repeat()
D. copy()
✅ Ans: B
Q56. Which removes duplicate values?
A. drop_duplicates()
B. remove()
C. delete()
D. unique()
✅ Ans: A
Q57. Arithmetic operations in Series are:
A. Scalar only
B. Vectorized
C. Not allowed
D. Manual
✅ Ans: B
Q58. Which function applies custom function?
A. apply()
B. map()
C. transform()
D. Both A and B
✅ Ans: D
Q59. Which returns Boolean Series?
A. isnull()
B. notnull()
C. Both A and B
D. None
✅ Ans: C
Q60. Which creates copy of Series?
A. duplicate()
B. copy()
C. clone()
D. replicate()
✅ Ans: B
Q61. Which method reassigns index?
A. reset_index()
B. set_index()
C. reindex()
D. change_index()
✅ Ans: C
Q62. Which function aligns data?
A. align()
B. merge()
C. join()
D. combine()
✅ Ans: A
Q63. Which method counts frequency?
A. count()
B. value_counts()
C. freq()
D. size()
✅ Ans: B
Q64. Which method rounds values?
A. round()
B. approx()
C. fix()
D. floor()
✅ Ans: A
Q65. Which returns Boolean if empty?
A. empty()
B. isempty()
C. empty
D. null()
✅ Ans: C
Q66. Which attribute returns memory usage?
A. memory()
B. memory_usage()
C. space()
D. size()
✅ Ans: B
Q67. Which method changes data type?
A. dtype()
B. convert()
C. astype()
D. type()
✅ Ans: C
Q68. Which method clips values?
A. clip()
B. cut()
C. limit()
D. trim()
✅ Ans: A
Q69. Which function returns correlation?
A. corr()
B. cov()
C. relate()
D. compare()
✅ Ans: A
Q70. Which function returns covariance?
A. corr()
B. cov()
C. var()
D. std()
✅ Ans: B
Q71. Which function returns variance?
A. var()
B. std()
C. mean()
D. spread()
✅ Ans: A
Q72. Which function returns standard deviation?
A. sd()
B. std()
C. spread()
D. deviation()
✅ Ans: B
Q73. Which method slices Series?
A. loc[]
B. iloc[]
C. Both A and B
D. slice()
✅ Ans: C
Q74. Which uses label-based indexing?
A. iloc
B. loc
C. at
D. Both B and C
✅ Ans: D
Q75. Which uses integer-based indexing?
A. loc
B. iloc
C. iat
D. Both B and C
✅ Ans: D
Q76. Which returns True/False for membership?
A. in
B. isin()
C. has()
D. contains()
✅ Ans: B
Q77. Which function bins data?
A. cut()
B. qcut()
C. Both A and B
D. bin()
✅ Ans: C
Q78. Which shifts values?
A. shift()
B. move()
C. slide()
D. roll()
✅ Ans: A
Q79. Which method repeats values?
A. repeat()
B. replicate()
C. duplicate()
D. again()
✅ Ans: A
Q80. Which returns absolute values?
A. abs()
B. absolute()
C. mod()
D. positive()
✅ Ans: A
Q81. Which returns logical AND?
A. &
B. and
C. &&
D. logical_and()
✅ Ans: A
Q82. Which returns logical OR?
A. |
B. or
C. ||
D. logical_or()
✅ Ans: A
Q83. Which method checks monotonic increase?
A. is_monotonic_increasing
B. is_sorted()
C. increasing()
D. order()
✅ Ans: A
Q84. Which method checks monotonic decrease?
A. is_decreasing()
B. is_monotonic_decreasing
C. descending()
D. order()
✅ Ans: B
Q85. Which returns cumulative product?
A. product()
B. cumprod()
C. multiply()
D. total()
✅ Ans: B
Q86. Which returns cumulative minimum?
A. cummin()
B. min()
C. lowest()
D. floor()
✅ Ans: A
Q87. Which returns cumulative maximum?
A. cummax()
B. max()
C. highest()
D. ceil()
✅ Ans: A
Q88. Which rounds down values?
A. round()
B. floor()
C. ceil()
D. fix()
✅ Ans: B
Q89. Which rounds up values?
A. round()
B. floor()
C. ceil()
D. fix()
✅ Ans: C
Q90. Which checks equality element-wise?
A. ==
B. equals()
C. compare()
D. Both A and B
✅ Ans: D
Q91. Which method checks Series equality?
A. ==
B. equals()
C. same()
D. compare()
✅ Ans: B
Q92. Which returns deep copy?
A. copy()
B. clone()
C. duplicate()
D. replicate()
✅ Ans: A
Q93. Which method converts index to list?
A. index.tolist()
B. index.list()
C. list(index)
D. Both A and C
✅ Ans: D
Q94. Which returns memory usage in bytes?
A. memory()
B. memory_usage(deep=True)
C. size()
D. bytes()
✅ Ans: B
Q95. Which method replaces values conditionally?
A. where()
B. mask()
C. Both A and B
D. replace()
✅ Ans: C
Q96. Which keeps values where condition is True?
A. mask()
B. where()
C. filter()
D. apply()
✅ Ans: B
Q97. Which replaces values where condition is True?
A. where()
B. mask()
C. filter()
D. clip()
✅ Ans: B
Q98. Which method aligns two Series?
A. align()
B. merge()
C. join()
D. append()
✅ Ans: A
Q99. Which method concatenates Series?
A. append()
B. concat()
C. Both A and B
D. merge()
✅ Ans: C
Q100. Pandas Series is built on:
A. List
B. Tuple
C. NumPy array
D. Dictionary
✅ Ans: C
