{"id":2149,"date":"2025-10-03T03:29:25","date_gmt":"2025-10-03T03:29:25","guid":{"rendered":"https:\/\/itxperts.co.in\/blog\/?p=2149"},"modified":"2026-01-11T08:57:50","modified_gmt":"2026-01-11T08:57:50","slug":"python-pandas-questions-cbse-class-12-board-exam","status":"publish","type":"post","link":"https:\/\/itxperts.co.in\/blog\/python-pandas-questions-cbse-class-12-board-exam\/","title":{"rendered":"100+ Python Pandas Questions for CBSE Class 12 Board Exam 2026 | IP &amp; CS"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\"><strong>Part 1: Foundational Concepts<\/strong><\/h3>\n\n\n\n<p><strong>1. What is Pandas?<\/strong> An open-source Python library used for high-performance <strong>data manipulation and analysis<\/strong>. \ud83d\udc3c<\/p>\n\n\n\n<p><strong>2. What are the two primary data structures in Pandas?<\/strong> <strong>Series<\/strong> (1-dimensional) and <strong>DataFrame<\/strong> (2-dimensional).<\/p>\n\n\n\n<p><strong>3. What is the standard alias for importing pandas?<\/strong> <code>pd<\/code> (as in <code>import pandas as pd<\/code>).<\/p>\n\n\n\n<p><strong>4. What is Matplotlib?<\/strong> A comprehensive library for creating static, animated, and interactive <strong>visualizations (plots and graphs)<\/strong> in Python. \ud83d\udcca<\/p>\n\n\n\n<p><strong>5. What is the standard alias for importing <code>matplotlib.pyplot<\/code>?<\/strong> <code>plt<\/code> (as in <code>import matplotlib.pyplot as plt<\/code>).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 2: Pandas Series<\/strong><\/h3>\n\n\n\n<p><strong>6. What is a Series?<\/strong> A <strong>one-dimensional labeled array<\/strong> capable of holding data of any type. Think of it as a single column of a spreadsheet.<\/p>\n\n\n\n<p><strong>7. What is an Index in a Series?<\/strong> The <strong>labels<\/strong> associated with the data values. If not specified, a default integer index <code>(0, 1, 2, ...)<\/code> is created.<\/p>\n\n\n\n<p><strong>8. What does <code>S.values<\/code> return?<\/strong> It returns the data of the Series <code>S<\/code> as a <strong>NumPy array<\/strong>.<\/p>\n\n\n\n<p><strong>9. What does <code>S.index<\/code> return?<\/strong> It returns the <strong>index (labels)<\/strong> of the Series <code>S<\/code>.<\/p>\n\n\n\n<p><strong>10. What is the use of the <code>S.head()<\/code> method?<\/strong> To view the <strong>first few rows<\/strong> of the Series (5 by default).<\/p>\n\n\n\n<p><strong>11. What is the use of the <code>S.tail()<\/code> method?<\/strong> To view the <strong>last few rows<\/strong> of the Series (5 by default).<\/p>\n\n\n\n<p><strong>12. What does the <code>S.size<\/code> attribute give?<\/strong> The total <strong>number of elements<\/strong> in the Series.<\/p>\n\n\n\n<p><strong>13. What is Vectorization in Pandas?<\/strong> Applying an operation or function to an <strong>entire Series at once<\/strong>, without using explicit loops.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 3: Pandas DataFrame<\/strong><\/h3>\n\n\n\n<p><strong>14. What is a DataFrame?<\/strong> A <strong>two-dimensional labeled data structure<\/strong> with columns of potentially different types. It&#8217;s like a table, spreadsheet, or SQL table.<\/p>\n\n\n\n<p><strong>15. What are the two axes in a DataFrame?<\/strong> <code>axis=0<\/code> for <strong>rows<\/strong> (index) and <code>axis=1<\/code> for <strong>columns<\/strong>.<\/p>\n\n\n\n<p><strong>16. What does <code>df.shape<\/code> return?<\/strong> A tuple representing the dimensions of the DataFrame: <strong>(number of rows, number of columns)<\/strong>.<\/p>\n\n\n\n<p><strong>17. How do you access the column labels of a DataFrame <code>df<\/code>?<\/strong> Using the <code>df.columns<\/code> attribute.<\/p>\n\n\n\n<p><strong>18. What does <code>df.T<\/code> do?<\/strong> It <strong>transposes<\/strong> the DataFrame, swapping its rows and columns.<\/p>\n\n\n\n<p><strong>19. How do you select a single column named &#8216;Name&#8217; from <code>df<\/code>?<\/strong> Using <code>df['Name']<\/code>.<\/p>\n\n\n\n<p><strong>20. What is the purpose of <code>df.info()<\/code>?<\/strong> To get a <strong>concise summary<\/strong> of the DataFrame, including data types and non-null counts.<\/p>\n\n\n\n<p><strong>21. What does <code>df.describe()<\/code> do?<\/strong> It generates <strong>descriptive statistics<\/strong> (mean, std, min, max, etc.) for the numerical columns.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 4: Data Accessing &amp; Selection<\/strong><\/h3>\n\n\n\n<p><strong>22. What is the difference between <code>.loc<\/code> and <code>.iloc<\/code>?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>.loc<\/code><\/strong> is used for <strong>label-based<\/strong> indexing.<\/li>\n\n\n\n<li><strong><code>.iloc<\/code><\/strong> is used for <strong>integer position-based<\/strong> indexing.<\/li>\n<\/ul>\n\n\n\n<p><strong>23. How do you select the first 5 rows of a DataFrame <code>df<\/code>?<\/strong> <code>df.iloc[0:5]<\/code> or simply <code>df.head()<\/code>.<\/p>\n\n\n\n<p><strong>24. What is Boolean Indexing?<\/strong> Using a boolean condition to <strong>filter data<\/strong>. For example, <code>df[df['Age'] &gt; 18]<\/code> selects rows where the &#8216;Age&#8217; is greater than 18.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 5: File Operations (CSV)<\/strong><\/h3>\n\n\n\n<p><strong>25. Which function is used to read a CSV file into a DataFrame?<\/strong> <code>pd.read_csv()<\/code>.<\/p>\n\n\n\n<p><strong>26. Which function is used to write a DataFrame to a CSV file?<\/strong> <code>df.to_csv()<\/code>.<\/p>\n\n\n\n<p><strong>27. How do you prevent the index from being written to the CSV file?<\/strong> Use the parameter <code>index=False<\/code> in <code>df.to_csv()<\/code>.<\/p>\n\n\n\n<p><strong>28. What does the <code>index_col<\/code> parameter do in <code>read_csv<\/code>?<\/strong> It sets one of the columns from the CSV file as the <strong>DataFrame&#8217;s index<\/strong>.<\/p>\n\n\n\n<p><strong>29. What does the <code>sep<\/code> parameter specify in <code>read_csv<\/code>?<\/strong> The <strong>delimiter<\/strong> or separator used in the file (e.g., <code>sep=';'<\/code>).<\/p>\n\n\n\n<p><strong>30. What does the <code>usecols<\/code> parameter do?<\/strong> It allows you to read only a <strong>specific subset of columns<\/strong> from the CSV file.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 6: Data Manipulation &amp; Cleaning<\/strong><\/h3>\n\n\n\n<p><strong>31. How do you add a new column named &#8216;Total&#8217; to a DataFrame <code>df<\/code>?<\/strong> By simple assignment: <code>df['Total'] = ...<\/code><\/p>\n\n\n\n<p><strong>32. How do you delete a column?<\/strong> Using the <code>df.drop()<\/code> method with <code>axis=1<\/code>. Example: <code>df.drop('ColumnName', axis=1)<\/code>.<\/p>\n\n\n\n<p><strong>33. How do you delete a row by its label?<\/strong> Using the <code>df.drop()<\/code> method with <code>axis=0<\/code>. Example: <code>df.drop('RowLabel', axis=0)<\/code>.<\/p>\n\n\n\n<p><strong>34. What is <code>NaN<\/code>?<\/strong> It stands for <strong>&#8220;Not a Number&#8221;<\/strong> and is the standard representation for <strong>missing data<\/strong> in Pandas.<\/p>\n\n\n\n<p><strong>35. How do you check for missing values in a DataFrame?<\/strong> Using the <code>df.isnull()<\/code> or <code>df.notnull()<\/code> methods.<\/p>\n\n\n\n<p><strong>36. What does <code>df.isnull().sum()<\/code> return?<\/strong> A Series containing the <strong>count of <code>NaN<\/code> values in each column<\/strong>.<\/p>\n\n\n\n<p><strong>37. What does <code>df.dropna()<\/code> do?<\/strong> It <strong>removes rows<\/strong> (or columns) that contain missing values (<code>NaN<\/code>).<\/p>\n\n\n\n<p><strong>38. What does <code>df.fillna(0)<\/code> do?<\/strong> It <strong>replaces all <code>NaN<\/code> values<\/strong> in the DataFrame with <code>0<\/code>.<\/p>\n\n\n\n<p><strong>39. How do you sort a DataFrame by the values in the &#8216;Score&#8217; column?<\/strong> <code>df.sort_values(by='Score')<\/code>.<\/p>\n\n\n\n<p><strong>40. What is the purpose of the <code>ascending=False<\/code> parameter in sorting?<\/strong> To sort the data in <strong>descending order<\/strong>.<\/p>\n\n\n\n<p><strong>41. What is the purpose of the <code>df.groupby()<\/code> function?<\/strong> To split the data into groups based on some criteria to perform <strong>aggregate operations<\/strong> (like sum, mean, count).<\/p>\n\n\n\n<p><strong>42. What does <code>df['Category'].value_counts()<\/code> do?<\/strong> It returns a Series containing the <strong>counts of unique values<\/strong> in the &#8216;Category&#8217; column.<\/p>\n\n\n\n<p><strong>43. How do you rename a column &#8216;OldName&#8217; to &#8216;NewName&#8217;?<\/strong> <code>df.rename(columns={'OldName': 'NewName'})<\/code>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 7: Plotting<\/strong><\/h3>\n\n\n\n<p><strong>44. Which function displays the plot window?<\/strong> <code>plt.show()<\/code>.<\/p>\n\n\n\n<p><strong>45. What is the easiest way to plot data from a DataFrame?<\/strong> Using the DataFrame&#8217;s built-in <code>.plot()<\/code> method (e.g., <code>df.plot()<\/code>).<\/p>\n\n\n\n<p><strong>46. How do you specify the type of plot (e.g., bar, line, pie)?<\/strong> Using the <code>kind<\/code> parameter in the <code>.plot()<\/code> method. E.g., <code>df.plot(kind='bar')<\/code>.<\/p>\n\n\n\n<p><strong>47. What is a line plot (<code>kind='line'<\/code>) used for?<\/strong> Typically for showing <strong>trends over a continuous interval<\/strong> like time.<\/p>\n\n\n\n<p><strong>48. What is a bar plot (<code>kind='bar'<\/code>) used for?<\/strong> For <strong>comparing quantities<\/strong> across different categories.<\/p>\n\n\n\n<p><strong>49. What is a histogram (<code>kind='hist'<\/code>) used for?<\/strong> To show the <strong>frequency distribution<\/strong> of a set of continuous numerical data.<\/p>\n\n\n\n<p><strong>50. What function sets the title of a plot?<\/strong> <code>plt.title('My Plot Title')<\/code>.<\/p>\n\n\n\n<p><strong>51. What functions are used to label the X and Y axes?<\/strong> <code>plt.xlabel('X-axis Label')<\/code> and <code>plt.ylabel('Y-axis Label')<\/code>.<\/p>\n\n\n\n<p><strong>52. What is a legend on a plot?<\/strong> A small box or area that <strong>identifies the different data series<\/strong> in a plot. It can be controlled with <code>plt.legend()<\/code>.<\/p>\n\n\n\n<p><strong>53. How do you make a horizontal bar chart?<\/strong> By setting <code>kind='barh'<\/code>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-luminous-vivid-amber-background-color has-background\">Long Question\/Ans<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 1: Core Pandas &#8211; Series (1-Mark Questions)<\/strong><\/h3>\n\n\n\n<p><strong>Q1: What is a Pandas Series?<\/strong> A Series is a one-dimensional labeled array, similar to a column in a spreadsheet. It can hold data of any type (integer, string, float, python objects, etc.).<\/p>\n\n\n\n<p><strong>Q2: Write the command to import the pandas library with the alias <code>pd<\/code>.<\/strong> <code>import pandas as pd<\/code><\/p>\n\n\n\n<p><strong>Q3: How do you create a Series from a Python list <code>L = [10, 20, 30]<\/code>?<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import pandas as pd\nL = &#91;10, 20, 30]\nS = pd.Series(L)\n<\/code><\/pre>\n\n\n\n<p><strong>Q4: What is the primary difference between a NumPy array and a Pandas Series?<\/strong> The main difference is that a Series has an <strong>explicitly defined index<\/strong> associated with its values, whereas a NumPy array has an implicit integer index.<\/p>\n\n\n\n<p><strong>Q5: How do you create a Series from a dictionary <code>D = {'a': 1, 'b': 2, 'c': 3}<\/code>?<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import pandas as pd\nD = {'a': 1, 'b': 2, 'c': 3}\nS = pd.Series(D)\n# The dictionary keys become the Series index.\n<\/code><\/pre>\n\n\n\n<p><strong>Q6: Consider the Series <code>S<\/code>. What will be the output of <code>S.values<\/code> and <code>S.index<\/code>?<\/strong> <code>S.values<\/code> will return a NumPy array containing the data <code>[1, 2, 3]<\/code>. <code>S.index<\/code> will return an Index object <code>['a', 'b', 'c']<\/code>.<\/p>\n\n\n\n<p><strong>Q7: How can you access the element with the label &#8216;b&#8217; in the Series <code>S<\/code> from Q5?<\/strong> You can use <code>S['b']<\/code> or <code>S.loc['b']<\/code>.<\/p>\n\n\n\n<p><strong>Q8: What do the <code>.head(2)<\/code> and <code>.tail(2)<\/code> functions do on a Series?<\/strong> <code>.head(2)<\/code> returns a new Series containing the <strong>first 2<\/strong> elements. <code>.tail(2)<\/code> returns a new Series containing the <strong>last 2<\/strong> elements.<\/p>\n\n\n\n<p><strong>Q9: Write the code to create a Series with the data <code>[5, 10, 15, 20]<\/code> and a custom index <code>['w', 'x', 'y', 'z']<\/code>.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import pandas as pd\ndata = &#91;5, 10, 15, 20]\nindex = &#91;'w', 'x', 'y', 'z']\nS = pd.Series(data, index=index)\n<\/code><\/pre>\n\n\n\n<p><strong>Q10: What does the <code>size<\/code> attribute of a Series return?<\/strong> The <code>size<\/code> attribute returns the total number of elements in the Series.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 2: Core Pandas &#8211; DataFrame (1 &amp; 2-Mark Questions)<\/strong><\/h3>\n\n\n\n<p><strong>Q11: What is a Pandas DataFrame?<\/strong> A DataFrame is a <strong>two-dimensional<\/strong>, size-mutable, and potentially heterogeneous tabular data structure with labeled axes (rows and columns). It&#8217;s like a spreadsheet or a SQL table.<\/p>\n\n\n\n<p><strong>Q12: How do you create a DataFrame from the dictionary <code>data = {'Name': ['Anu', 'Bob'], 'Age': [21, 25]}<\/code>?<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import pandas as pd\ndata = {'Name': &#91;'Anu', 'Bob'], 'Age': &#91;21, 25]}\ndf = pd.DataFrame(data)\n<\/code><\/pre>\n\n\n\n<p><strong>Q13: What does the <code>df.shape<\/code> attribute return for the DataFrame created in Q12?<\/strong> It will return a tuple <code>(2, 2)<\/code>, representing (number of rows, number of columns).<\/p>\n\n\n\n<p><strong>Q14: What is the command to display the first 3 rows of a DataFrame <code>df<\/code>?<\/strong> <code>df.head(3)<\/code><\/p>\n\n\n\n<p><strong>Q15: What is the command to display the column labels of a DataFrame <code>df<\/code>?<\/strong> <code>df.columns<\/code><\/p>\n\n\n\n<p><strong>Q16: Explain the difference between <code>loc<\/code> and <code>iloc<\/code> for selecting data from a DataFrame.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>.loc<\/code><\/strong> is label-based, meaning you have to specify the names of the rows and columns.<\/li>\n\n\n\n<li><strong><code>.iloc<\/code><\/strong> is integer-position based, meaning you have to specify rows and columns by their integer position (starting from 0).<\/li>\n<\/ul>\n\n\n\n<p><strong>Q17: Given a DataFrame <code>df<\/code>, how would you select the column named &#8216;Score&#8217;?<\/strong> <code>df['Score']<\/code> or <code>df.Score<\/code> (if the column name is a valid Python identifier).<\/p>\n\n\n\n<p><strong>Q18: How do you add a new column &#8216;Grade&#8217; with values <code>['A', 'B']<\/code> to the DataFrame from Q12?<\/strong> <code>df['Grade'] = ['A', 'B']<\/code><\/p>\n\n\n\n<p><strong>Q19: What is the command to transpose a DataFrame <code>df<\/code>?<\/strong> <code>df.T<\/code><\/p>\n\n\n\n<p><strong>Q20: How can you delete the column named &#8216;Age&#8217; from a DataFrame <code>df<\/code>?<\/strong> <code>df.drop('Age', axis=1)<\/code> <em>(Note: <code>axis=1<\/code> specifies that we are dropping a column. To make the change permanent, use <code>inplace=True<\/code> or reassign: <code>df = df.drop(...)<\/code>)<\/em><\/p>\n\n\n\n<p><strong>Q21: What does the <code>df.info()<\/code> method do?<\/strong> It prints a concise summary of the DataFrame, including the index dtype, column dtypes, non-null values, and memory usage.<\/p>\n\n\n\n<p><strong>Q22: What does the <code>df.describe()<\/code> method show?<\/strong> It generates descriptive statistics for the numerical columns, such as count, mean, standard deviation, min, max, and quartiles.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 3: CSV File Handling (2-Mark Questions)<\/strong><\/h3>\n\n\n\n<p><strong>Q23: Write the Python statement to read a file named <code>student.csv<\/code> into a pandas DataFrame <code>df<\/code>.<\/strong> <code>df = pd.read_csv('student.csv')<\/code><\/p>\n\n\n\n<p><strong>Q24: How would you write the contents of a DataFrame <code>df<\/code> to a new CSV file named <code>output.csv<\/code>?<\/strong> <code>df.to_csv('output.csv')<\/code><\/p>\n\n\n\n<p><strong>Q25: When writing a DataFrame to a CSV, an extra unnamed column is often created. How do you prevent this?<\/strong> Use the <code>index=False<\/code> parameter. <code>df.to_csv('output.csv', index=False)<\/code><\/p>\n\n\n\n<p><strong>Q26: Your CSV file <code>data.csv<\/code> uses a semicolon (<code>;<\/code>) as a separator instead of a comma. How do you read it correctly?<\/strong> <code>df = pd.read_csv('data.csv', sep=';')<\/code><\/p>\n\n\n\n<p><strong>Q27: How can you read a CSV file and specify the &#8216;RollNo&#8217; column as the index for the DataFrame?<\/strong> <code>df = pd.read_csv('student.csv', index_col='RollNo')<\/code><\/p>\n\n\n\n<p><strong>Q28: How do you read only specific columns, &#8216;Name&#8217; and &#8216;Marks&#8217;, from <code>student.csv<\/code>?<\/strong> <code>df = pd.read_csv('student.csv', usecols=['Name', 'Marks'])<\/code><\/p>\n\n\n\n<p><strong>Q29: What parameter in <code>pd.read_csv()<\/code> would you use if your CSV file has no header row?<\/strong> <code>header=None<\/code>. Pandas will automatically assign integer column names: 0, 1, 2, &#8230; <code>df = pd.read_csv('data.csv', header=None)<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 4: Data Manipulation &amp; Analysis (2 &amp; 3-Mark Questions)<\/strong><\/h3>\n\n\n\n<p><strong>Q30: Given a DataFrame <code>df<\/code> with a &#8216;Marks&#8217; column, how do you find the average marks?<\/strong> <code>df['Marks'].mean()<\/code><\/p>\n\n\n\n<p><strong>Q31: How do you sort the DataFrame <code>df<\/code> based on the &#8216;Marks&#8217; column in descending order?<\/strong> <code>df.sort_values(by='Marks', ascending=False)<\/code><\/p>\n\n\n\n<p><strong>Q32: How can you check for missing\/null values in a DataFrame <code>df<\/code>?<\/strong> <code>df.isnull()<\/code> or <code>df.isnull().sum()<\/code> to get a count of nulls per column.<\/p>\n\n\n\n<p><strong>Q33: Write the command to drop all rows that contain any missing values from a DataFrame <code>df<\/code>.<\/strong> <code>df.dropna()<\/code><\/p>\n\n\n\n<p><strong>Q34: How do you fill all <code>NaN<\/code> values in a DataFrame <code>df<\/code> with the value 0?<\/strong> <code>df.fillna(0)<\/code><\/p>\n\n\n\n<p><strong>Q35: Consider a DataFrame <code>sales<\/code> with columns &#8216;Region&#8217; and &#8216;Revenue&#8217;. How do you calculate the total revenue for each region?<\/strong> <code>sales.groupby('Region')['Revenue'].sum()<\/code><\/p>\n\n\n\n<p><strong>Q36: How do you select all rows from a DataFrame <code>df<\/code> where the value in the &#8216;Age&#8217; column is greater than 25?<\/strong> <code>df[df['Age'] &gt; 25]<\/code><\/p>\n\n\n\n<p><strong>Q37: What is the command to rename the column &#8216;Name&#8217; to &#8216;Student_Name&#8217; in DataFrame <code>df<\/code>?<\/strong> <code>df.rename(columns={'Name': 'Student_Name'})<\/code> <em>(Note: Use <code>inplace=True<\/code> to modify the original DataFrame.)<\/em><\/p>\n\n\n\n<p><strong>Q38: How do you count the occurrences of each unique value in the &#8216;City&#8217; column of a DataFrame <code>df<\/code>?<\/strong> <code>df['City'].value_counts()<\/code><\/p>\n\n\n\n<p><strong>Q39: How would you add a new row to a DataFrame <code>df<\/code>?<\/strong> While direct appending is possible (<code>df.loc[new_index] = [values]<\/code>), the modern and recommended approach is to create a new DataFrame for the row and use <code>pd.concat()<\/code>:<\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>new_row = pd.DataFrame(&#91;{'Name': 'Ram', 'Age': 23}])\ndf = pd.concat(&#91;df, new_row], ignore_index=True)\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 5: Plotting with Matplotlib (2 &amp; 3-Mark Questions)<\/strong><\/h3>\n\n\n\n<p><strong>Q40: Write the command to import the <code>pyplot<\/code> module from <code>matplotlib<\/code> with the alias <code>plt<\/code>.<\/strong> <code>import matplotlib.pyplot as plt<\/code><\/p>\n\n\n\n<p><strong>Q41: Given a DataFrame <code>df<\/code> with columns &#8216;Year&#8217; and &#8216;Sales&#8217;, write the code to create a simple line plot.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import matplotlib.pyplot as plt\ndf.plot(x='Year', y='Sales', kind='line')\nplt.title('Yearly Sales')\nplt.xlabel('Year')\nplt.ylabel('Sales')\nplt.show()\n<\/code><\/pre>\n\n\n\n<p><strong>Q42: How do you create a vertical bar chart from the data in Q41?<\/strong> Change <code>kind='line'<\/code> to <code>kind='bar'<\/code>. <code>df.plot(x='Year', y='Sales', kind='bar')<\/code><\/p>\n\n\n\n<p><strong>Q43: How do you create a horizontal bar chart?<\/strong> Change <code>kind='bar'<\/code> to <code>kind='barh'<\/code>. <code>df.plot(x='Year', y='Sales', kind='barh')<\/code><\/p>\n\n\n\n<p><strong>Q44: What is a histogram and what does it represent? How do you create one for a &#8216;Marks&#8217; column in a DataFrame <code>df<\/code>?<\/strong> A histogram is a graphical representation of the distribution of numerical data. It groups numbers into ranges (bins) and shows the frequency of data in each range. <code>df['Marks'].plot(kind='hist')<\/code> <code>plt.show()<\/code><\/p>\n\n\n\n<p><strong>Q45: How can you create a pie chart to show the proportion of students in different sections (&#8216;A&#8217;, &#8216;B&#8217;, &#8216;C&#8217;) stored in a &#8216;Section&#8217; column of a DataFrame <code>df<\/code>?<\/strong> First, get the counts of each section, then plot.<\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>section_counts = df&#91;'Section'].value_counts()\nsection_counts.plot(kind='pie', autopct='%1.1f%%')\nplt.ylabel('') # Hides the 'Section' label on the side\nplt.title('Student Distribution by Section')\nplt.show()\n<\/code><\/pre>\n\n\n\n<p><strong>Q46: How do you add a legend to your plot?<\/strong> The legend is often added automatically when plotting from a DataFrame. You can customize it using <code>plt.legend()<\/code>. For example: <code>plt.legend(['Sales Data'])<\/code>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Part 6: Applied\/Case-Study Questions (3-5 Marks)<\/strong><\/h3>\n\n\n\n<p>Assume you have a file named <strong><code>Product.csv<\/code><\/strong> with the following content:<\/p>\n\n\n\n<p>Code snippet<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PID,PName,Price,Category\n101,Laptop,75000,Electronics\n102,Keyboard,2500,Electronics\n103,Book,800,Stationery\n104,Pen,50,Stationery\n105,Smartphone,45000,Electronics\n<\/code><\/pre>\n\n\n\n<p><strong>Q47: Write a Python program to read the <code>Product.csv<\/code> file into a DataFrame and display its first 3 rows.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import pandas as pd\ndf = pd.read_csv(\"Product.csv\")\nprint(df.head(3))\n<\/code><\/pre>\n\n\n\n<p><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>   PID     PName   Price     Category\n0  101    Laptop   75000  Electronics\n1  102  Keyboard    2500  Electronics\n2  103      Book     800   Stationery\n<\/code><\/pre>\n\n\n\n<p><strong>Q48: Using the DataFrame from Q47, write the code to display the <code>PName<\/code> and <code>Price<\/code> of all products where the <code>Category<\/code> is &#8216;Electronics&#8217;.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>electronics_df = df&#91;df&#91;'Category'] == 'Electronics']\nprint(electronics_df&#91;&#91;'PName', 'Price']])\n<\/code><\/pre>\n\n\n\n<p><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>        PName  Price\n0      Laptop  75000\n1    Keyboard   2500\n4  Smartphone  45000\n<\/code><\/pre>\n\n\n\n<p><strong>Q49: Using the DataFrame from Q47, calculate and display the average price of products for each category.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>avg_price = df.groupby('Category')&#91;'Price'].mean()\nprint(avg_price)\n<\/code><\/pre>\n\n\n\n<p><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Category\nElectronics    40833.333333\nStationery       425.000000\nName: Price, dtype: float64\n<\/code><\/pre>\n\n\n\n<p><strong>Q50: Add a new column named <code>Discount_Price<\/code> to the DataFrame which is 90% of the original <code>Price<\/code>. Display the entire DataFrame after adding the column.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df&#91;'Discount_Price'] = df&#91;'Price'] * 0.90\nprint(df)\n<\/code><\/pre>\n\n\n\n<p><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>   PID       PName   Price     Category  Discount_Price\n0  101      Laptop   75000  Electronics         67500.0\n1  102    Keyboard    2500  Electronics          2250.0\n2  103        Book     800   Stationery           720.0\n3  104         Pen      50   Stationery            45.0\n4  105  Smartphone   45000  Electronics         40500.0\n<\/code><\/pre>\n\n\n\n<p><strong>Q51: Write a complete program to read <code>Product.csv<\/code> and create a bar chart showing the price of each product. The product name should be on the x-axis and the price on the y-axis.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import pandas as pd\nimport matplotlib.pyplot as plt\n\ndf = pd.read_csv(\"Product.csv\")\ndf.plot(x='PName', y='Price', kind='bar', figsize=(8, 5))\n\nplt.title('Product Prices')\nplt.xlabel('Product Name')\nplt.ylabel('Price (INR)')\nplt.xticks(rotation=45) # Rotate x-axis labels for better readability\nplt.tight_layout() # Adjust layout\nplt.show()\n<\/code><\/pre>\n\n\n\n<p><strong>Q52: Write the output of the following code, given the DataFrame <code>df<\/code> from Q47.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(df.iloc&#91;1:4, 1:3])\n<\/code><\/pre>\n\n\n\n<p><strong>Answer:<\/strong> <code>iloc<\/code> is integer-based. It will select rows with index 1, 2, 3 (4 is exclusive) and columns with index 1, 2 (3 is exclusive). <strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>      PName  Price\n1  Keyboard   2500\n2      Book    800\n3       Pen     50\n<\/code><\/pre>\n\n\n\n<p><strong>Q53: Write the output of the following code, assuming the PID column is set as the index.<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df = pd.read_csv(\"Product.csv\", index_col='PID')\nprint(df.loc&#91;103])\n<\/code><\/pre>\n\n\n\n<p><strong>Answer:<\/strong> <code>.loc<\/code> is label-based. It will select the row where the index label is <code>103<\/code>. <strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PName         Book\nPrice          800\nCategory    Stationery\nName: 103, dtype: object\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Part 1: Foundational Concepts 1. What is Pandas? An open-source Python library used for high-performance data manipulation and analysis. \ud83d\udc3c 2. What are the two primary data structures in Pandas? Series (1-dimensional) and DataFrame (2-dimensional). 3. What is the standard alias for importing pandas? pd (as in import pandas as pd). 4. What is Matplotlib? [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2150,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"googlesitekit_rrm_CAow44u0DA:productID":"","footnotes":""},"categories":[213,44],"tags":[24,34,33],"class_list":["post-2149","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informatics-practices","category-python-tutorials","tag-cbse","tag-cs-coaching","tag-ip-coaching"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>100+ Python Pandas Questions for CBSE Class 12 Board Exam 2026 | IP &amp; CS<\/title>\n<meta name=\"description\" content=\"Ace your CBSE Class 12 Informatics Practices (IP) &amp; CS exams! 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