CBSE Class 12 Computer Science Question Paper 2023
Here in this post we are giving the latest 2023 Computer Science Question Paper for CBSE Class 12 Students. This Question paper will be helpful for the next year Class 12 aspirants. This also help the new Class 12 students to understand the question pattern for the next CBSE Class 12 Computer Science Examination. We hope this post will helpful for every one.
Class 12 Computer Science Question Paper 2023
SECTION – (A)
(1) State True or False :
“Identifiers are names used to identify a variable, function in a program
(2) Which of the following is a valid keyword in Python?
(a) false
(b) return.
(c) non_local
(d) none
(3) Given the following Tuple
Top = (10, 20, 30, 50)
Which of the following statements will result in an error?
(a) print (Tup 0 ))
(b) Tup insert (2,3)
(c) print (Tup (1 : 2 ))
(d) print (len (Tup))
(4) Consider the given expression
5 < 10 and 12 > 7 or not 7 > 4
Which of the following will be the correct output, if the given expression is evaluated?
(a) True
(b) False
(c) NONE
(d) NULL
(5) Select the correct output of the code :
S “Amit Mahotsav @ 75″
A = S partition (” “)
print (a)
(a) (Amrit ‘Mahotsav’, @, ’75’)
(b) ‘Amrit’, ‘Mahotsav’, ‘@’, ’75’)
(c) (‘Amrit’, ‘Mahotsav @ 75’)
(d) (‘Amrit’, ‘Mahotsav @ 75’)
(6) Which of the following mode keeps the file offset position file?
(a) I+
(b) I
(c) w
(d) a
(7) Fill in the blank :
_____ function is used to arrange the elements of a list in ascending order.
(b) arrange ()
(a) sort ()
(c) ascending ()
(d) asort ()
(8) Which of the following operators will return either True or False?
(a) + =
(b) – =
(c) =
(d) *=
(9) Which of the following statement(s) would give an error after executing the following code?
Stud = “Murugan”:100, “Mithu”:951 Statement 1
print (Stud(951) Statement 2
Stud “Murugan”) = 99 Statement 3
print (Stud pop () Statement 4
print (Studi) Statement 5
(a) Statement 2
(b) Statement 3
(c) Statement 4
(d) Statements 2 and 4
(10) Fill in the blank
___ is a number of tuples in a relation
(a) Attribute
(b) Degree
(c) Domain
(d) Cardinality
(11) The syntax of seek ( ) is :
file_object seek (offset |, reference_point))
What is the default value of reference_point?
(a) 0
(b) 1
(c) 2
(d) 3
(12) Fill in the blank :
______ clause is used with SELECT statement to display data in a sorted form with respect to a specified column.
(a) WHERE
(b) ORDER BY
(c) HAVING
(d) DISTINCT
(13) Fill in the blank
_____ is used for point to point communication or unicast communication such as radar and satellite.
(a) INFRARED WAVES
(b) BLUETOOTH
(c) MICROWAVES
(d) RADIOWAVES
(14) What will the following expression be evaluated to in Python?
print (4 + 3 * 5/3-5 2)
(a) 8.5
(b) 8.0
(c) 10.2
(d) 10.0
(15) Which function returns the sum of all elements of a list?
(a) count ()
(b) sum ()
(c) total ()
(d) add ()
(16) fetchall() method fetches all rows in a result set and returns a
(a) Tuple of lists
(b) List of tuples
(c) List of strings
(d) Tuple of strings
Q 17 and 18 are ASSERTION (A) and REASONING (R) based questions
Mark the correct choice as
(a) Both (A) and (R) are true and (R) is the correct explanation for (A).
(b) Both (A) and (R) are true and (R) is not the correct explanation for (A)
(c) (A) is true but (R) is false.
(d) (A) in false but (R) is true
(17) Assertion (A) : To use a function from a particular module, we need to import the module.
Reason (R) : import statement can be written anywhere in the program, before using a function from that module.
(18) Assertion (A): A stack is a LIFO structure
Reason (R) : Any new element pushed into the stack always gets positioned at the index after the last existing element in the stack.
SECTION – (B)
(19) Atharva is a Python programmer working on a program to find and return the maximum value from the list The code written below has syntactical errors Rewrite the correct code and underline the corrections made.
def max num (L):
max = L (0) e
for a in L
if a > max
max = a
return max
(20) – (a) Differentiate between wired and wireless transmission OR
(20) – (b) Differentiate between URL and domain name with the help of an appropriate example
(21) – (a) Given is a Python list declaration
List of names = (“Aman”. “Ankit”, “Ashien”, “Rajan”, “Rajat “)
Write the output of
print (Listofnames (-1 : -4: -11))
(b) Consider the following tuple declaration
Tupl = (10, 20, 30, 10, 20, 301, 40)
Write the output of
print (tupl .index (20))
(22) Explain the concept of “Alternate Key in a Relational Database Management System with an appropriate example
(23) Write the full forms of the following
(i) HTML
(ii) TCP
(b) What is the need of Protocols?
(24) – (a) Write the output of the code given below
def short_sub (1st, n)
for i in range (0, n)
if len (1st > 4:
1st (i) = 1st (i) + 1st (i)
else:
1st (i) = 1st (i)
subject = (‘CS’ “HINDI, PHYSICS’, ‘CHEMISTRY’, ‘MATHS’)
short_sub(subject, 5)
print . (subject)
OR
(b) Write the output of the code given below
a = 30
def call (x) :
global a
if a 2 = = 0 :
x + = a
else:
x – = a
return x
x = 20
print(call) (35), end = ” “)
print(call) (40), end = ” @ “)
(25) – (a) Differentiate between CHAR and VARCHAR data types in SQL with appropriate example.
OR
(b) Name any two DDL and any two DML commanded
SECTION – (C)
(26) – (a) Consider the following tables – LOAN and BORROWER
Table LOAN
LOAN_NO | B_NAME | AMOUNT |
L 170 | DELHI | 3000 |
L 230 | KANPUR | 4000 |
Table BORROWER
GUST_NAME | LOAN_NO |
JOHN | L 171 |
KRISH | L 230 |
RAVYA | L 170 |
How many rows and columns will be there in the natural join of these two tables?
(b) Write the output of the queries (1) to (v) based on the table WORKER given below
TABLE WORKER
W ID | F NAME | L NAME | CITY | STATE |
102 | SHIL | KHAN | KANPUR | UTTAR PRADESH |
104 | SAMEER | PARIKH | ROOP NAGAR | PANJAB |
105 | MARY | JONES | DELHI | DELHI |
106 | MAHIR | SHARMA | SONIPAT | HARUANA |
107 | ATHARVA | BHARDWAJ | DELHI | DELHI |
108 | VEDA | SHARMA | KANPUR | UATTAR PRADESH |
(i) SELECT DESCE F HAME, CITY FROM WORKER ORDER BY STATE
(ii) SELECT DISTINCT (CITY) FROM WORKER,
(iii) SELECT LIKE HA F NAME. STATE FROM WORKER WHERE L_NAME
(iv) SELECT CITY, COUNT(*) FROM WORKER GROUP BY CITY;
(27) – (a) Write the definition of a Python function named Longlines() which reads the contents of a text file named ‘LINES.TXT’ and displays those lines from the file which have at least 10 words in it For example, if the content of ‘LINES. TXT’ is as follows
Once upon a time, there was a woodcutter
He lived in a little house in a beautiful, green wood.
One day, he was merrily chopping some wood.
He saw a little girl skipping through the woods, whistling happily.
The girl was followed by a big gray wolf.
Then the function should display output as
He lived in a little house in a beautiful, green wood.
He saw a little girl skipping through the woods, whistling happily.
OR
(b) Write a function count D words () in Python to count the words ending with a digit in a text file “Details.txt”
Example
If the file content is as follows
On seat2 VIP1 will sit and
On seat! VVIP2 will be sitting
Output will be
Number of words ending with a digit are 4
(28) – (a) Write the outputs of the SQL queries (i) to (iv) based on the relations COMPUTER and SALES given below
Table COMPUTER
PROD ID | PROD NAME | PRICE | COMPANY | TYPE |
P001 | MOUSE | 200 | LOGITECH | INPUT |
P002 | LASER PRINTER | 4000 | CANON | OUTPUT |
P003 | KEYBORD | 500 | LOGITESC I | NPUT |
P004 | JOYSTIC | 1000 | IBALL | INPUT |
P005 | SPEAKER | 1200 | CREATIVE | OUTPUT |
P006 | DESKJET PRINTER | 4300 | CANON | OUTPUT |
Table SALES
PROD ID | QTY SOLD | QUARTER |
P002 | 4 | 1 |
P003 | 2 | 2 |
P001 | 3 | 2 |
P004 | 2 | 1 |
(i) SELECT MIN (PRICE), MAX(PRICE) FROM COMPUTER
(ii) SELECT COMPANY, COUNT(*) FROM COMPUTER GROUP BY COMPANY HAVING COUNT (COMPANY) > 1
(iii) SELECT PROD_NAME, QTY SOLD FROM COMPUTER C, SALES S WHERE C PROD 1D = S PROD_ID AND TYPE INPUT
(iv) SELECT PROD NAME. COMPANY, QUARTER C, SALES S WHERE C FROD 1D = S PROD 10: FROM COMPUTER
(b) Write the command to view all databases.
(29) Write a function EOReplace() in Python, which accepts a list L of numbers. Thereafter, it increments all even numbers by 1 and decrements all odd numbers by 1
Example
If Sample Input data of the list is
L = (10, 20, 30, 40, 35, 55)
Output will be :
L = (11, 21, 31, 41, 34, 54)
(30) – (a) A list contains following record of customer.
(Customer_name, Room Type)
Write the following user defined functions to perform given operations on the stack named ‘Hotel’:
(i) Push_Cust () – To Push customers’ names of those customers who are staying in ‘Delux’ Room Type (ii) Pop_Cust () – To Pop the names of customers from the stack and display them Also, display “Underflow” when there are no customers in the stack
For example
If the lists with customer details are as follows
[“Siddarth”, “Delux”]
[“Rahul”, “Standard”]
[“Jerry”, “Delux”]
The stack should contain
Jerry
Siddharth
The output should be
Jerry
Siddharth
Underflow
OR
(b) Write a function in Python, Push (vehicle) where, Vehicle is a dictionary containing details of vehicles- (Car_Name: Maker).
The function should push the name of car manufactured by “TATA” (including all the possible cases like Tata. TaTa, etc) to the stack
For example
If the dictionary contains the following data:
Vehicle =”Santro”: “Hyundai”, “Nexon”: “TATA”, “Safari”:”Tata”)
The stack should contain
Satari
Nexon
SECTION – (D)
(31) Quirked, an IT based firm, located in Delhi is planning to set up a network for its four branches within a city with its Marketing department in Kanpur As a network professional, give solutions to the questions (1) to (v), after going through the branches locations and other details which are given below :
Distance between various branches is as follows
Branch | Distance |
Branch A to Branch B | 40 m |
Branch A to Branch C | 80 m |
Branch A to Branch D | 65 m |
Branch B to Branch C | 30 m |
Branch A to Branch D | 35 m |
Branch A to Branch D | 15 m |
Delhi Branch to Kanpur | 300 km |
Number of computers in each of the branches
Branch | Number of Computers |
Branch A | 15 |
Branch B | 25 |
Branch C | 40 |
Branch D | 115 |
(i) Suggest the most suitable place to install the server for the Delhi branch with a suitable reason.
(ii) Suggest an ideal layout for connecting all these branches within Delhi
(iii), Which device will you suggest, that should be placed in each of these branches to efficiently connect all the computers within these branches”
(iv) Delhi firm is planning to connect to its Marketing department in Kanpur which is approximately 300 km away Which type of network out of LAN. WAN or MAN will be formed? Justify your answer
(v) Suggest a protocol that shall be needed to provide help for transferring of files between Delhi and Kanpur branch
(32) – (a) What possible outputs) are expected to be displayed on screen at the time of execution of the following program import random
M = (15, 10, 15, 20, 25, 30)
for i in range (1, 3):
first = random randint (2, 5) – 1
sec = random.randint (3, 6) – 2
third random.randint (1,4)
print (MI first). ML sec). ML third] ,sep = ” # ”)
(i) 10#25#15
20#25#25
(ii) 5#25#20
25#20#15
(iii) 30#20#20
20#25#225
(iv) 10#15#25#
15#20#10
(b) The code given below deletes the record from the table employee which contains the following record structure
E_code String
E_name String
Sal – Integer
City – String
Note the following to establish connectivity between Python and MySQL
• Username is root
• Password is root
• The table exists in a MySQL database named emp
• The details (E code.E_name, Sal, City) are the attributes of the table
Write the following statements to complete the code
Statement 1 – to import the desired library
Statement 2 – execute the command that deletes the record with E code as ‘E101
Statement 3 – to delete the record permanently from the database.
import ________ as mysql # Statement 1
def delete():
mydb-mysql.connect thost-“localhost”, user “root”, passwd=”root”, database=”emp”)
mycursor-mydb.cursor()
_______________________ # Statement 2
________________________ # Statement 3
print (“Record deleted”)
OR
(a) Predict the output of the code given below
def makenewimystr):
newstr “”
count=0
for i in mystr:
if count 12-0:
newsti neust: str(count)
else:
if 1.lower ()
newstr#newst: 1 upper (1)
else:
newstr newstri+1
Count += 1
print (newstr)
makenew(“[email protected]”)
(b) The code given below reads the following records from the table employes and displays only those records who have employees coming from city ‘Delhi’
E code String
E name-String
al Integer
City-String
Note the following to establish connectivity between Python and MySQL
Username is root
Password is root
The table exists in a MySQL database named emp
The details (E code. E name, Sai, City) are the attributes of the table
Write the following statements to complete the code
Statement 1 – to import the desired library
Statement 2 – to execute the query that fetches records of the employees coming from city ‘Delhi’
Statement 3 – to read the complete data of the query (rows whose city is Delhi into the object named details, from the table employee in the database
import
def display 1):
mydb-mysql.connect thost “localhost”, user”root”,
passud-“root”, database=”amp”
mycursor mydb.cursor()
__________________ # Statement 2
__________________ # Statement 3
for 1 in details:
print (1)
(33) (a) Write one difference between CSV and text files Write a program in Python that defines and calls the following user defined functions.
(i) COURTER ADD) It takes the values from the user and adds the details to a cav file ‘courier.cay Each record consists of a list with field elements as cid, a name, Source, destination to store Courier ID, Sender name, Source and destination address respectively
(ii) COURIER SEARCH() Takes the destination as the input and displays all the courier records going to that destination
OR
(b) Why it is important to close a file before exiting”
Write a program in Python that defines and calls the following user defined functions
(i) Add Book Takes the details of the books and adds them to a csv file ‘Book.cav Each record consists of a list with field. elements as book 10. B name and pub to store book ID, book name and publisher respectively
(ii) Search Book() : Takes publisher name as input and counts and displays number of books published by them.
SECTION – E
(34) The school has asked their estate manager Mr. Rahul to maintain the data of all the labs in a table LAB Rahul has created a table and entered data of 5 labs.
LABNO | LAB_NAME | INCHARGE | CAPACITY | PLOOR |
L001 | CHEMISTRY | Daisy | 20 | I |
L002 | BIOLOGY | Venky | 20 | II |
L003 | MATH | Preeti | 15 | I |
L004 | LANGUAGE | Daisy | 36 | III |
L005 | COMPUTER | Mary kom | 37 | II |
Based on the data given above answer the following questions
(i) Identify the columns which can be considered as Candidate keys
(ii) Write the degree and cardinality of the table.
(iii) Write the statements to
(a) Insert a new row with appropriate data:
(b) Increase the capacity of all the labs by 10 students which are on T Floor
OR
(Option for part (iii) only)
(ii) Write the statements to
(a) Add a constraint PRIMARY KEY to the column LABNO in the table
(b) Delete the table LAB
(35) Shreyas is a programmer, who has recently been given a task to write a user defined function named write bin() to create a binary file called Cunt file,dat containing customer information customer number enal, name te names, quantity (qty), price (price) and amount Lamt of each customer.
The function accepts customer number. name, quantity and price Thereafter, it displays the message Quantity less than 10… Cannot SAVE, if quantity entered is less than 10. Otherwise the function calculates amount as price quantity and then writes the record in the form of a list into the binary file
import pickle def write bin
bin files
#Statement 1
while True:
e_nowint (input renter customer number 1) c_nama-input (“enter customer name”)
qty-int (input(“enter qty”11 price-int (input (“enter price”))
If _________________ # Statement
#Statement 2 print(“Quantity less than 10..Cannot SAVE”)
else
amt-price qty
c_detail-ic_no, c_name, qty, price, amt]
_______________ Statement 3
ans = input (“Do you wish to enter more records y/n”) if ans lower()’n’:
_____________ # Statement 4
______________ # Statement 5
_______________ # Statement 6
(i) Write the correct statement to open a file Cust file.dat for writing the data of the customer
(ii) Which statement should Shreyas fill in Statement 2 to check whether quantity is less than 10.
(iii) Which statement should Shreyas fill in Statement 3 to write data to the binary file and in Statement 4 to stop further processing if the user does not wish to enter more records
OR
(Option for part (iii) only)
(iii) What should Shreyas fill in Statement 5 to close the binary file named Cust file.dat and in Statement 6 to call a function to write data in binary file?
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