Computer Science (Python) Board Sample Paper 2023-2024 Commerce (English Medium) Class 12 Question Paper Solution

“In a Python program, if a break statement is given in a nested loop, it terminates the execution of all loops in one go.”

True

False

In a table in the MYSQL database, an attribute A of datatype varchar(20) has the value “Keshav”. The attribute B of datatype char(20) has the value “Meenakshi”. How many characters are occupied by attribute A and attribute B?

20,6

6,20

9,6

6,9

What will be the output of the following statement:

print(3-2**2**3+99/11)

244

244.0

-244.0

Error

Select the correct output of the code:

s = "Python is fun"
l = s.split()
s_new = "_".join([1[0].upper(), 1[1], 1[2].capitalize()])
print(s_new)

PYTHON-IS-Fun

PYTHON-is-Fun

Python-is-fun

PYTHON-IS -Fun

In MYSQL database, if a table, Alpha has degree 5 and cardinality 3, and another table, Beta has degree 3 and cardinality 5, what will be the degree and cardinality of the Cartesian product of Alpha and Beta?

5, 3

8, 15

3, 5

15, 8

Riya wants to transfer pictures from her mobile phone to her laptop. She uses Bluetooth Technology to connect two devices. Which type of network will be formed in this case?

PAN

LAN

MAN

WAN

Which of the following will delete key-value pair for key = “Red” from a dictionary D1?

delete D1("Red")

del D1["Red"]

del.D1["Red"]

D1.del["Red"]

Consider the statements given below and then choose the correct output from the given options:

pride="#G20 Presidency"
print(pride[-2:2:-2])

ndsr

ceieP0

ceieP

yndsr

Which of the following statement(s) would give an error during the execution of the following code?

tup = (20, 30, 40, 50, 80, 79)
print(tup)                     #Statement 1
print(tup[3] + 50)     #Statement 2
print(max(tup))         #Statement 3
tup[4]=80                  #Statement 4

Statement 1

Statement 2

Statement 3

Statement 4

What possible outputs(s) will be obtained when the following code is executed?

import random
myNumber=random.randint (0, 3)
COLOR=["YELLOW", "WHITE", "BLACK", "RED"]
for I in range (1, myNumber) :
              print (COLOR [I], end="*")
       print ()

RED*
WHITE*
BLACK*

WHITE*
BLACK*

WHITE*WHITE*
BLACK*BLACK*

YELLOW*
WHITE*WHITE*
BLACK*BLACK*BLACK*

The modem at the sender’s computer end acts as a ______.

Model

Modulator

Demodulator

Convertor

Consider the code given below:

b=100
def test(a):
   ______________ # missing statement
   b=b+a
   print (a,b)
test (10)
print (b)

Which of the following statements should be given in the blank for #Missing Statement, if the output produced is 110?

global a

global b=100

global b

global a=100

An exception may be raised even if the program is syntactically correct.

True

False

Which of the following statements is FALSE about keys in a relational database?

Any candidate key is eligible to become a primary key.

A primary key uniquely identifies the tuples in a relation.

A candidate key that is not a primary key is a foreign key.

A foreign key is an attribute whose value is derived from the primary key of another relation.

In case of ______ switching, before a communication starts, a dedicated path is identified between the sender and the receiver.

Which of the following functions changes the position of file pointer and returns its new position?

flush ()

tell ()

seek ()

offset ()

• Assertion(A): List is an immutable data type.
• Reasoning(R): When an attempt is made to update the value of an immutable variable, the old variable is destroyed and a new variable is created by the same name in memory.

Both A and R are true and R is the correct explanation for A.

Both A and R are true and R is not the correct explanation for A.

A is True but R is False.

A is false but R is True.

• Assertion(A): Python standard library consists of number of modules.
• Reasoning(R): A function in a module is used to simplify the code and avoids repetition.

Both A and R are true and R is the correct explanation for A.

Both A and R are true and R is not the correct explanation for A.

A is True but R is False.

A is false but R is True.

Expand the following in the context of Internet Protocol:

POP3

Expand the following:

URL

Write two points of difference between XML and HTML.

Define the term bandwidth with respect to networks.

How is http different from https?

The code given below accepts a number as an argument and returns the reverse number. Observe the following code carefully and rewrite it after removing all syntax and logical errors. Underline all the corrections made.

define revNumber (num) :
      rev = 0
      rem = 0
      While num > 0:
            rem ==num %10
            rev = rev*10 + rem
            num = num//10
            return rev
print (revNumber (1234))

Write a function countNow (PLACES) in Python, that takes the dictionary, PLACES as an argument and displays the names (in uppercase) of the places whose names are longer than 5 characters.
For example, Consider the following dictionary

PLACES={1:"Delhi",2:"London",3:"Paris",4:"New York",5:"Doha"}

The output should be:

• LONDON
• NEW YORK

Write a function, lenWords(STRING), that takes a string as an argument and returns a tuple containing length of each word of a string.
For example, if the string is "Come let us have some fun", the tuple will have (4, 3, 2, 4, 4, 3)

Predict the output of the following code:

S = "LOST"
L = [10, 21, 33, 4]
D={}
for I in range(len(S)):
        if I%2==0:
             D[L.pop()] = S[I]
        else:
              D[L.pop ()] = I+3
for K,V in D.items () :
       print (K,V, sep="*")

Write the Python statement for the following task using the BUILT-IN function/method only:

To insert an element 200 at the third position, in the list L1.

Write the Python statement for the following task using the BUILT-IN function/method only:

To check whether a string named, message ends with a full stop/period or not.

A list named studentAge stores age of students of a class. Write the Python command to import the required module and (using built-in function) to display the most common age value from the given list.

Ms Shalini has just created a table named “Employee” containing columns Ename, Department and Salary. After creating the table, she realized that she has forgotten to add a primary key column in the table. Help her in writing an SQL command to add a primary key column EmpId of integer type to the table Employee.

Thereafter, write the command to insert the following record in the table:

EmpId- 999
Ename- Shweta
Department: Production
Salary: 26900

Zack is working in a database named SPORT, in which he has created a table named “Sports” containing columns SportId, SportName, no_of_players, and category.

After creating the table, he realized that the attribute, category has to be deleted from the table and a new attribute TypeSport of data type string has to be added. This attribute TypeSport cannot be left blank. Help Zack write the commands to complete both the tasks.

Predict the output of the following code:

def Changer (P, Q=10):
          P=P/Q
          Q=P%Q
          return P
A=200
B=20
A=Changer(A,B)
print(A,B,sep='$')
B=Changer(B)
print(A,B sep='$', end='# # #')

Predict the output of the Python code given below:

Text1="IND-23"
Text2=""
I=0
While I<len (Text1):
       if Text1[I]>="0" and Text1 [I]<="9":
            Val = int (Text1 [I])
             Val = Val + 1
              Text2=Text2 + str(Val)
       elif Text1 [I]>="A" and Text 1 [I]<="Z":
              Text2=Text2 + (Text1 [I + 1])
       else:
              Text2=Text2 + "*"
       I+=1
print (Text2)

Consider the table CLUB given below and write the output of the SQL queries that follow.

1. SELECT COUNT(DISTINCT SPORTS) FROM CLUB;
2. SELECT CNAME, SPORTS FROM CLUB
   WHERE DOAPP<"2006-04-30" AND CNAME LIKE "%NA";
3. SELECT CNAME, AGE, PAY FROM CLUB WHERE GENDER = "MALE" AND PAY BETWEEN 1000 AND 1200;

Write a function in Python to read a text file, Alpha.txt and displays those lines which begin with the word ‘You’.

Write a function, vowelCount() in Python that counts and displays the number of vowels in the text file named Poem.txt.

Consider the table Personal given below:

Based on the given table, write SQL queries for the following:

1. Increase the salary by 5% of personals whose allowance is known.
2. Display Name and Total Salary (sum of Salary and Allowance) of all personals. The column heading ‘Total Salary’ should also be displayed.
3. Delete the record of Supervisors who have salary greater than 25000.

A list, NList contains following record as list elements:

[City, Country, distance from Delhi] 

Each of these records are nested together to form a nested list. Write the following user defined functions in Python to perform the specified operations on the stack named travel.

1. Push_element(NList): It takes the nested list as an argument and pushes a list object containing name of the city and country, which are not in India and distance is less than 3500 km from Delhi.
2. Pop_element(): It pops the objects from the stack and displays them. Also, the function should display “Stack Empty” when there are no elements in the stack.

For example: If the nested list contains the following data:

NList=[["New York", "U.S.A.", 11734],
["Naypyidaw", "Myanmar", 3219],
["Dubai", "UAE", 2194],
["London", "England", 6693],
["Gangtok", "India", 1580],
["Columbo", "Sri Lanka", 3405]]

The stack should contain:

['Naypyidaw', 'Myanmar'],
['Dubai', 'UAE'],
['Columbo', 'Sri Lanka']

The output should be:

['Columbo', 'Sri Lanka']
['Dubai', 'UAE']
['Naypyidaw', 'Myanmar']
Stack Empty

Consider the tables PRODUCT and BRAND given below:

Write SQL queries for the following:

1. Display product name and brand name from the tables PRODUCT and BRAND.
2. Display the structure of the table PRODUCT.
3. Display the average rating of Medimix and Dove brands.
4. Display the name, price, and rating of products in descending order of rating.

Vedansh is a Python programmer working in a school. For the Annual Sports Event, he has created a csv file named Result.csv, to store the results of students in different sports events. The structure of

Result.csv is:

[St_Id, St_Name, Game_Name, Result]

Where

St_Id is Student ID (integer)

ST_name is Student Name (string)

Game_Name is name of game in which student is participating(string). Result is result of the game whose value can be either 'Won', 'Lost' or 'Tie'.

For efficiently maintaining data of the event, Vedansh wants to write the following user defined functions:

Accept() - to accept a record from the user and add it to the file

Result.csv. The column headings should also be added on top of the csv file.

wonCount() - to count the number of students who have won any event.

As a Python expert, help him complete the task.

Meticulous EduServe is an educational organization. It is planning to setup its India campus at Chennai with its head office at Delhi. The Chennai campus has 4 main buildings - ADMIN, ENGINEERING, BUSINESS and MEDIA.

Block to Block distances (in Mtrs.)

Number of computers in each of the blocks/Center is as follows:

1. Suggest and draw the cable layout to efficiently connect various blocks of buildings within the CHENNAI campus for connecting the digital devices.
2. Which network device will be used to connect computers in each block to form a local area network?
3. Which block, in Chennai Campus should be made the server? Justify your answer.
4. Which fast and very effective wireless transmission medium should preferably be used to connect the head office at DELHI with the campus in CHENNAI?
5. Suggest a device/software to be installed in the CHENNAI Campus to take care of data security.

Differentiate between r+ and w+ file modes in Python.

Consider a file, SPORT.DAT, containing records of the following structure:

[SportName, TeamName, No_Players]

Write a function, copyData(), that reads contents from the file SPORT.DAT and copies the records with Sport name as “Basket Ball” to the file named BASKET.DAT. The function should return the total number of records copied to the file BASKET.DAT.

How are text files different from binary files?

A Binary file, CINEMA.DAT has the following structure:

{MNO:[MNAME, MTYPE]}

Where

• MNO - Movie Number
• MNAME - Movie Name
• MTYPE is Movie Type

Write a user defined function, findType(mtype), that accepts mtype as parameter and displays all the records from the binary file CINEMA.DAT, that have the value of Movie Type as mtype.

Define the term Domain with respect to RDBMS. Give one example to support your answer.

Kabir wants to write a program in Python to insert the following record in the table named Student in MYSQL database,

SCHOOL:

• rno(Roll number) - integer
• name(Name) - string
• DOB (Date of birth) - Date
• Fee - float

Note the following to establish connectivity between Python and MySQL:

• Username - root
• Password - tiger
• Host - localhost

The values of fields rno, name, DOB and fee has to be accepted from the user. Help Kabir to write the program in Python.

Give one difference between alternate key and candidate key.

Sartaj has created a table named Student in MYSQL database, SCHOOL:

• rno(Roll number )- integer
• name(Name) - string
• DOB (Date of birth) – Date
• Fee – float

Note the following to establish connectivity between Python and MySQL:

• Username - root
• Password - tiger
• Host - localhost

Sartaj, now wants to display the records of students whose fee is more than 5000. Help Sartaj to write the program in Python.