CBSE Class 12 Computer Science Question Paper 2012 (Set I (Delhi))

CBSE CLASS XII Questions

• 1.

  Expand and explain the term URL.
  

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• 2.

  A CSV file "P_record.csv" contains the records of patients in a hospital. Each record of the file contains the following data:
  - Name of a patient
  - Disease
  - Number of days patient is admitted
  - Amount
  
  For example, a sample record of the file may be:
  ["Gunjan", "Jaundice", 4, 15000]
  
  Write the following Python functions to perform the specified operations on this file:
  
  (i) Write a function read_data() which reads all the data from the file and displays the details of all the 'Cancer' patients.
  
  (ii) Write a function count_rec() which counts and returns the number of records in the file.
  

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• 3.

  Write a Python function that displays all the lines containing the word 'vote' from a text file "Elections.txt".
  For example, if the file contains:
  In an election many people vote to choose their representative.
  The candidate getting the maximum share of votes stands elected.
  Normally, one person has to vote once.
  The process of voting may vary with time and region.
  Then the output should be:
  In an election many people vote to choose their representative.
  Normally, one person has to vote once.
  

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• 4.

  A stack, named ClrStack, contains records of some colors. Each record is represented as a tuple containing four elements — ColorName, RED, GREEN, BLUE. ColorName is a string, and RED, GREEN, BLUE are integers. For example, a record in the stack may be ('Yellow', 237, 250, 68).
  
  Write the following user-defined functions in Python to perform the specified operations on ClrStack:
  
  (i) push_Clr(ClrStack, new_Clr): This function takes the stack ClrStack and a new record new_Clr as arguments and pushes this new record onto the stack.
  
  (ii) pop_Clr(ClrStack): This function pops the topmost record from the stack and returns it. If the stack is already empty, the function should display the message "Underflow".
  
  (iii) isEmpty(ClrStack): This function checks whether the stack is empty. If the stack is empty, the function should return True, otherwise the function should return False.
  

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• 5.

  Write a Python function that displays all the words starting and ending with a vowel from a text file "Report.txt".
  The consecutive words should be separated by a space in the output.
  For example, if the file contains:
  Once there was a wise man in a village.
  He was an awesome story-teller.
  He was able to keep people anchored while listening to him.
  Then the output should be:
  Once a a awesome able
  

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• 6.

  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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