CBSE Class 12 Computer Science Question Paper 2025 (Set 4 - 91)

CBSE CLASS XII Questions

• 1.

  Write the following user-defined functions in Python:
  
  (i) push_trail(N, myStack): Here N and myStack are lists, and myStack represents a stack.
  The function should push the last 5 elements from the list N onto the stack myStack.
  Assume that N contains at least 5 elements.
  
  (ii) pop_one(myStack): The function should pop an element from the stack myStack, and return this element.
  If the stack is empty, then the function should display the message 'Stack Underflow', and return None.
  
  (iii) display_all(myStack): The function should display all the elements of the stack myStack, without deleting them.
  If the stack is empty, the function should display the message 'Empty Stack'.
  

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• 2.

  Expand and explain the term URL.
  

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• 3.

  Nisha is assigned the task of maintaining the staff data of an organization. She has to store the details of the staff in the SQL table named EMPLOYEES with attributes as EMPNO, NAME, DEPARTMENT, BASICSAL to store Employee’s Identification Number, Name, Department, and Basic Salary respectively. There can be two or more Employees with the same name in the organization.
  (i)
  (a) Help Nisha to identify the attribute which should be designated as the PRIMARY KEY. Justify your answer.
  OR
  (b) Help Nisha to identify the constraint which should be applied to the attribute NAME such that the Employees’ Names cannot be left empty or NULL while entering the records but can have duplicate values.
  (ii)
  (a) Write the SQL command to change the size of the attribute BASICSAL in the table EMPLOYEES to allow the maximum value of 99999.99 to be stored in it.
  OR
  (b) Write the SQL command to delete the table EMPLOYEES.
  

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• 4.

  Write a function Delete_Theatre() to input the value of Th_ID from the user and permanently delete the corresponding record from the THEATRE table in the CINEMA database.
  
  Given:
  Host: localhost, User: root, Password: Ex2025
  

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• 5.

  Predict the output of the following code:
  
  

  def ExamOn(mystr):
      newstr = ""
      count = 0
      for i in mystr:
          if count % 2 != 0:
              newstr = newstr + str(count - 1)
          else:
              newstr = newstr + i.lower()
          count += 1
      newstr = newstr + mystr[:2]
      print("The new string is:", newstr)
  
  ExamOn("GenX")
  

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• 6.

  Expand the term PPP. What is the use of PPP?
  

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