CBSE Class 12 Computer Science Question Paper 2014 (Set 91/1 (Delhi))

CBSE CLASS XII Questions

• 1.

  Write the output on execution of the following Python code:
  
  

  def Change(X):
      for K, V in X.items():
          L1.append(K)
          L2.append(V)
  
  D = {1: "ONE", 2: "TWO", 3: "THREE"}
  L1 = []
  L2 = []
  Change(D)
  print(L1)
  print(L2)
  print(D)
  

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• 2.

  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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• 3.

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

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• 4.

  A file PASSENGERS.DAT stores the records of passengers using the following structure:
  PNR, PName, BRDSTN, DESTN, FARE
  
  Where:
  - PNR — Passenger Number (string type)
  - PName — Passenger Name (string type)
  - BRDSTN — Boarding Station Name (string type)
  - DESTN — Destination Station Name (string type)
  - FARE — Fare amount for the journey (float type)
  
  Write user-defined functions in Python for the following tasks:
  
  (i) Create() – to input data for passengers and write it in the binary file PASSENGERS.DAT.
  (ii) SearchDestn(D) – to read contents from the file PASSENGERS.DAT and display the details of those Passengers whose DESTN matches with the value of D.
  (iii) UpdateFare() – to increase the fare of all passengers by 5% and rewrite the updated records into the file PASSENGERS.DAT.
  

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• 5.

  What possible output from the given options is expected to be displayed when the following code is executed?
  

  import random
  Cards = ["Heart", "Spade", "Club", "Diamond"]
  for i in range(2):
      print(Cards[random.randint(1, i+2)], end="#")
  

  • Spade#Diamond#
    
  • Spade#Heart#
    
  • Diamond#Club#
    
  • Heart#Spade#
    
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• 6.

  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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