CBSE Class XII Computer Science - Practice Test
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  2. Practice Tests
  3. CBSE Class XII Computer Science

CBSE Class XII Computer Science - Practice Test

2025-07-14
Jaspreet Jaspreet

Duration

15 min

Questions

35

Marking

Negative

Test Currently Unavailable

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Questions Preview

Which of the following is an invalid identifier to be used in Python?

A
per%marks
B
_for
C
While
D
true

What is the correct way to add an element to the end of a list in Python?

A
list.add(element)
B
list.append(element)
C
list.insert(element)
D
list.extend(element)

What will be the output of print("Welcome To My Blog"[2:6] + "Welcome To My Blog"[5:9])?

A
Lcomme
B
lcomme T
C
lcomme To
D
lcomme

Which of the following statements is false?

A
A try-except block can have more than one except statement
B
One block of except statement cannot handle multiple exceptions
C
The finally block is always executed
D
When 1 == "1" is executed, no exception is raised

Which of the following statement(s) would give an error during the execution of the code with dictionary R = {'pno':52,'pname':'Virat', 'expert':['Badminton','Tennis'] ,'score':(77,44)}?

A
print(R) #Statement 1
B
R['expert'][0]='Cricket' #Statement 2
C
R['score'][0]=50 #Statement 3
D
R['pno']=50 #Statement 4

Which pickle module method is used to write a Python object to a binary file?

A
save()
B
serialize()
C
store()
D
dump()

Given dictionaries dict_student = {"rno" : "53", "name" : 'Rajveer Singh'} and dict_marks = {"Accts" : 87, "English" : 65}, which statement will append the contents of dict_marks in dict_student?

A
dict_student + dict_marks
B
dict_student.add(dict_marks)
C
dict_student.merge(dict_marks)
D
dict_student.update(dict_marks)

Which of the following is not a component of the math module in Python?

A
ceil()
B
mean()
C
fabs()
D
pi

What will be the output of the following code? L=["One , Two", "Three", "Four"]; print(len(L)/2*len(L[0]))

A
6.5
B
13
C
13.5
D
6.0

What does PPP stand for in networking?

A
Point-to-Point Protocol
B
Peer-to-Peer Protocol
C
Public Private Partnership
D
Personal Privacy Protocol

Which SQL operator performs pattern matching?

A
BETWEEN operator
B
LIKE operator
C
EXISTS operator
D
= operator

Which Python function is used for displaying only one result set from SQL table in a database?

A
fetch1()
B
fetchno()
C
fetchall()
D
fetchone()

Which of the following file opening mode in Python, generates an error if the file does not exist?

A
a
B
r
C
w
D
w+

The correct syntax of seek() is:

A
file_object.seek(offset [, reference_point])
B
seek(offset [, reference_point])
C
seek(offset, file_object)
D
seek.file_object(offset)

Which of the following statements is false?

A
SMTP and POP protocols are used in email communication
B
URL of a page is not always the same as its domain name
C
HTTPS is safer than HTTP
D
Interlinking of collection of webpages is called Internet

_ protocol provides access to services hosted on a remote computer.

A
FTP
B
PPP
C
Telnet
D
SMTP

Assertion (A): For changes made to a variable defined within a function to be visible outside the function, it should be declared as global. Reasoning (R): Variables defined within a function are local to that function by default, unless explicitly specified with the global keyword.

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 is false but R is True

Assertion (A): A binary file in python is used to store collection objects like lists and dictionaries that can be later retrieved in their original form using pickle module. Reasoning (R): Binary files are just like normal text files and can be read using a text editor like Notepad.

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 is false but R is True

Which of the following is an advantage of circuit switching?

A
Guaranteed bandwidth and low latency
B
Efficient use of network resources
C
Supports variable data rates
D
Cost effective for short communications

Identify the syntax error in the following code: num1, num2 = 10, 45; While num1 % num2 == 0; num1+= 20; num2+= 30; Else: print('hello')

A
While should be while (lowercase)
B
Missing colon after While condition
C
Else should be else (lowercase)
D
All of the above

What will be the output when a function dispBook(BOOKS) displays names in uppercase of books whose name starts with a consonant, given BOOKS = {1:"Python", 2:"Internet Fundamentals", 3:"Networking", 4:"Oracle sets", 5:"Understanding HTML"}?

A
PYTHON, NETWORKING
B
PYTHON, NETWORKING, UNDERSTANDING HTML
C
INTERNET FUNDAMENTALS, ORACLE SETS
D
All book names in uppercase

What will be the output of the following code? L = [5,10,15,1]; G = 4; def Change(X): global G; N=len(X); for i in range(N): X[i] += G; Change(L); for i in L: print(i,end='$')

A
5$10$15$1$
B
9$14$19$5$
C
1$6$11$-3$
D
Error

Which Python statement is used to delete an element 'Mumbai':50 from Dictionary D?

A
del D['Mumbai']
B
D.remove('Mumbai')
C
D.delete('Mumbai')
D
D.pop('Mumbai':50)

What is the difference between % (percentage) and _ (underscore) characters used with the LIKE operator in SQL?

A
% matches any sequence of characters, _ matches exactly one character
B
_ matches any sequence of characters, % matches exactly one character
C
Both match any sequence of characters
D
Both match exactly one character

If SELECT count(Department) and SELECT count(*) from Employee table are producing different results, what may be the possible reason?

A
Department column contains NULL values
B
Table has duplicate records
C
Department column has different data types
D
Table is empty

What will be the output of SELECT * FROM BOOK NATURAL JOIN MEMBER; when tables BOOK and MEMBER share a common column CODE?

A
All records from both tables
B
Only matching records based on CODE column
C
Cross product of both tables
D
Error because tables are incompatible

What will be the output of SELECT FID, MIN(FEES), MAX(FEES) FROM COURSES GROUP BY FID; from the COURSES table?

A
FID with minimum and maximum fees for each faculty
B
Overall minimum and maximum fees
C
Error because of GROUP BY clause
D
All faculty IDs with same min and max values

A function COUNT() reads from 'Gratitude.txt' and displays count of letter 'e' in each line. If line 1 contains 'Gratitude is a humble heart's radiant glow,', what should be the count?

A
2
B
3
C
4
D
5

In the RESULT table with columns ADNO, ROLLNO, SNAME, SEM1, SEM2, DIVISION, which columns can be considered as candidate keys?

A
ADNO only
B
ROLLNO only
C
ADNO and ROLLNO
D
SNAME and DIVISION

Given a Stack implementation for student IDs who scored ≥80 in TS3, if Stu_dict ={5:(87,68,89), 10:(57,54,61), 12:(71,67,90), 14:(66,81,80), 18:(80,48,91)}, which IDs will be pushed to the stack?

A
[5, 12, 14, 18]
B
[5, 10, 12, 18]
C
[12, 14, 18]
D
[5, 18]

A function maxsalary() reads from 'record.csv' containing employee data (E_code, E_name, Scale, Salary) and should display the row with maximum salary. What approach should be used?

A
Read all rows, find max salary, display that row
B
Sort the CSV file first, then read last row
C
Use SQL MAX function
D
Read first row only

A function expensiveProducts() reads from binary file 'INVENTORY.DAT' with structure (ProductID, ProductName, Quantity, Price) and displays products with price > Rs. 1000. What module is required?

A
csv module
B
pickle module
C
json module
D
os module

For Fun Media Services Ltd network in Mumbai with buildings ADMIN(110 computers), DECORATORS(75), MEDIA(12), FOOD(20), which building should host the server?

A
ADMIN - highest number of computers
B
MEDIA - central location
C
FOOD - closest to all buildings
D
DECORATORS - balanced location

What is the difference between seek() and tell() functions in Python file handling?

A
seek() sets file position, tell() returns current position
B
tell() sets file position, seek() returns current position
C
Both set file position
D
Both return current position

In MySQL-Python connectivity, to establish connection with database 'STORE', which parameter is missing in mysql.connect(host='localhost', user='root', password='____', database='STORE')?

A
admin
B
root
C
tiger
D
localhost