Question 1

Question 1State True or False:The Python interpreter handles logical errors during code execution.

Accepted Answer

FalseReason — The Python interpreter handles syntax errors during code execution, but it does not handle logical errors. Logical errors, also known as semantic errors, occur when the code is syntactically correct but does not produce the expected output due to incorrect logic or algorithm. These types of errors are caught during the testing and debugging phase, not during code execution by the interpreter.

Question 2

Question 2Identify the output of the following code snippet:text = "PYTHONPROGRAM"
text = text.replace('PY', '#')
print(text)#THONPROGRAM##THON#ROGRAM#THON#ROGRAM#YTHON#ROGRAM

Accepted Answer

#THONPROGRAMReason — The replace() method in Python searches for a specified substring and replaces it with another. In the given code, the substring 'PY' in the string "PYTHONPROGRAM" is replaced with the character '#'. As a result, the string "PYTHONPROGRAM" becomes "#THONPROGRAM", and that's the output displayed.

Question 3

Question 3Which of the following expressions evaluates to False ?not(True) and FalseTrue or Falsenot(False and True)True and not(False)

Accepted Answer

not(True) and FalseReason —not(True) and False evaluates to False and False, which is False.True or False evaluates to True.not(False and True) evaluates to not(False), which is True.True and not(False) evaluates to True and True, which is True.

Question 4

Question 4What is the output of the expression ?country = 'International'
print(country.split("n"))('I', 'ter', 'atio', 'aI')['I', 'ter', 'atio', 'al']['I', 'n', 'ter', 'n', 'atio', 'n', 'al']Error

Accepted Answer

['I', 'ter', 'atio', 'al']Reason — The code defines a string country = 'International' and uses the split("n") method to split the string at each occurrence of the letter "n". This breaks the string into a list of parts: ['I', 'ter', 'atio', 'al'], with each occurrence of "n" removed and the remaining substrings stored as separate elements in the list. The print() function then outputs this list.

Question 5

Question 5What will be the output of the following code snippet ?message = "World Peace"
print(message[-2::-2])

Accepted Answer

Outputce lo
ExplanationThe code message[-2::-2] starts from the second-last (-2) character of the string "World Peace", which is "c".It moves backwards in steps of 2 to select every second character going towards the start of the string.The traversal goes as follows:Index -2: Character is "c".Index -4: Character is "e".Index -6: Character is a space (" ").Index -8: Character is "l".Index -10: Character is "o".The output is "ce lo".

Question 6

Question 6What will be the output of the following code ?tuple1 = (1, 2, 3)
tuple2 = tuple1
tuple1 += (4, )
print(tuple1 == tuple2)TrueFalsetuple1Error

Accepted Answer

FalseReason — In the above code, tuple1 is initially assigned the tuple (1, 2, 3), and tuple2 references the same tuple. When the line tuple1 += (4, ) is executed, it modifies tuple1 to (1, 2, 3, 4) because the += operator creates a new tuple rather than modifying the existing one. Thus, tuple1 now contains (1, 2, 3, 4), while tuple2 remains (1, 2, 3). Therefore, the expression tuple1 == tuple2 evaluates to False.

Question 7

Question 7If my_dict is a dictionary as defined below, then which of the following statements will raise an exception ?my_dict = {'apple' : 10, 'banana' : 20, 'orange' : 30}my_dict.get('orange')print(my_dict['apple', 'banana'])my_dict['apple'] = 20print(str(my_dict))

Accepted Answer

print(my_dict['apple', 'banana'])Reason — In Python dictionaries, keys must be accessed individually or as a single key. The expression my_dict['apple', 'banana'] attempts to use a tuple as a key (i.e., ('apple', 'banana')), which does not exist in my_dict. As a result, this will raise an Error. The other statements will not raise exceptions; my_dict.get('orange') will return 30, my_dict['apple'] = 20 will update the value for the key 'apple', and print(str(my_dict)) will print the dictionary as a string.

Question 8

Question 8What does the list.remove(x) method do in Python ?Removes the element at index x from the listRemoves the first occurrence of value x from the listRemoves all occurrences of value x from the listRemoves the last occurrence of value x from the list

Accepted Answer

Removes the first occurrence of value x from the list.Reason — The list.remove(x) method in Python searches for the first occurrence of the value x in the list and removes it. If the specified value is not found, it raises an Error.

Question 9

Question 9If a table which has one Primary key and two alternate keys. How many Candidate keys will this table have ?1234

Accepted Answer

3Reason — In a table, the primary key uniquely identifies each record, and alternate keys also uniquely identify records but are not the primary key. In this case, with one primary key and two alternate keys, the table will have three candidate keys in total: one primary key and two alternate keys. Candidate keys are potential keys that can uniquely identify records in a table.

Question 10

Question 10Write the missing statement to complete the following code:file = open("example.txt", "r")
data = file.read(100)
............... #Move the file pointer to the beginning of the file
next_data = file.read(50)
file.close()

Accepted Answer

file.seek(0)Reason — To move the file pointer to the beginning of the file, we can use the seek() method. When we pass 0 as the offset to this function, it moves the file pointer to the beginning of the file.So the complete code is:file = open("example.txt", "r")
data = file.read(100)
file.seek(0)  # Move the file pointer to the beginning of the file
next_data = file.read(50)
file.close()

Question 11

Question 11State whether the following statement is True or False:The finally block in Python is executed only if no exception occurs in the try block.

Accepted Answer

FalseReason — The finally block in Python is always executed after the try block, regardless of whether an exception occurred or not.

Question 12

Question 12What will be the output of the following code ?c = 10
def add():
    global c
    c = c + 2
    print(c, end = '#')
add()
c = 15
print(c, end = '%')12%15#15#12%12#15%12%15#

Accepted Answer

12#15%Reason —The variable c is initially set to 10.The function add() is defined. Inside this function, the global keyword is used to indicate that the variable c refers to the global variable defined outside the function.Inside add(): When add() is called:The value of c (which is 10) is accessed.It is then incremented by 2, making c equal to 12.The new value of c (12) is printed, followed by a # symbol.After calling the function, the global c is now 12. However, it is then explicitly set to 15.Finally, the new value of c (15) is printed, followed by a % symbol.

Question 13

Question 13Which SQL command can change the degree of an existing relation ?

Accepted Answer

The SQL command that can change the degree of an existing relation (table) is ALTER TABLE.

Question 14

Question 14What will be the output of the query ?SELECT * FROM products WHERE product_name LIKE 'App%';Details of all products whose names start with 'App'Details of all products whose names end with 'App'Names of all products whose names start with 'App'Names of all products whose names end with 'App'

Accepted Answer

Details of all products whose names start with 'App'Reason — The SELECT * statement indicates that every column of data should be returned for each matching record. It uses the LIKE operator with the pattern 'App%', where the % wildcard represents any sequence of characters. Therefore, this query will return details of all products from the products table where the product_name starts with 'App', including any characters that may follow.

Question 15

Question 15In which datatype the value stored is padded with spaces to fit the specified length.DATEVARCHARFLOATCHAR

Accepted Answer

CHARReason — The CHAR data type in SQL is used to store fixed-length strings. When a value is stored in a CHAR field, it is padded with spaces to fit the specified length.

Question 16

Question 16Which aggregate function can be used to find the cardinality of a table ?sum()count()avg()max()

Accepted Answer

count()Reason — The count() aggregate function is used to find the cardinality of a table, which refers to the number of rows in that table.

Question 17

Question 17Which protocol is used to transfer files over the Internet ?HTTPFTPPPPHTTPS

Accepted Answer

FTPReason — The File Transfer Protocol (FTP) is used for transferring files over the Internet. It allows users to upload, download, and manage files on remote servers.

Question 18

Question 18Which network device is used to connect two networks that use different protocols ?ModemGatewaySwitchRepeater

Accepted Answer

GatewayReason — A gateway is a network device that connects two networks that use different protocols, enabling communication between them.

Question 19

Question 19Which switching technique breaks data into smaller packets for transmission, allowing multiple packets to share the same network resources.

Accepted Answer

Packet switching is a method of data transmission where data is broken into smaller packets before being sent over the network. Each packet can take different routes to reach the destination, allowing multiple packets from various sources to share the same network resources simultaneously.

Question 20

Question 20Assertion (A): Positional arguments in Python functions must be passed in the exact order in which they are defined in the function signature.Reasoning (R): This is because Python functions automatically assign default values to positional arguments.Both A and R are true, and R is the correct explanation of A.Both A and R are true, and R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

A is true but R is false.ExplanationPositional arguments must be passed in the order they are defined in the function signature in Python. Python does not automatically assign default values to positional arguments. Default values must be explicitly defined in the function signature, if not provided, the function will raise an error.

Solved 2025 Sample Question Paper CBSE Class 12 Computer Science (083)

Section A 1 Mark Each

Section B 2 Marks Each

Section C 3 Marks Each

Section D 4 Marks Each

Section E 5 Marks Each