Class 11 Half Yearly Question Paper 2025-26 Computer Science

CBSE CLASS 11
Half Yearly Question Paper
Session 2025-26

COMPUTER
SCIENCE

Exam CBSE Class 11
Subject Computer Science
Session 2025-26
Document Type Half Yearly Question Paper

Notes · Sample Papers · Previous Year Papers · Mock Tests

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Question Paper
HALF YEARLY EXAMINATION
Session: 2025 - 2026 ag
Class: XI Maximum Marks: 70
Subject: Computer Science (Code: 083) Time: 3hrs
___________________________________________________________________________
General Instructions:
• This question paper contains 37 questions and 6 pages.
• All questions are compulsory, internal choices are to be marked in different sections.
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• Programming language: Python
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• The paper is divided into 5 Sections - A, B, C, D and E.
Section A, consists of 21 questions (1 to 21). Each question carries 1 Mark.
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Section B, consists of 7 questions (22 to 28). Each question carries 2 Marks.

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Section C, consists of 3 questions (29 to 31). Each question carries 3 Marks.
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Section D, consists of 4 questions (32 to 35). Each question carries 4 Marks.
Section E, consists of 2 questions (36 to 37). Each question carries 5 Marks.

Q No. SECTION A (21 × 1=21 Marks) Marks
1. When we work on any file on PC, it is stored temporarily in ______ 1
memory.
a) RAM b) ROM
c) CPU d) CD-ROM
2. Which is an example of a system software : 1
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a) Disk Defragmenter b) Openoffice

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c) Linux d) None of the above

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3. “The OR operation of a variable with its complement always results in 1

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1”
Which law is stated above?
a) Associative law ag b) Complement law
c) Distributive law d) Identity law
4. This gate can be combined to replace any other logic gates. Identify this 1
logic gate.
a) AND b) NOT
c) OR d) NAND
5. Extended ASCII has __________ code points 1
a) 8 b) 64
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c) 128 d) 256
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6. A decimal number 233 is _______ in binary.

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a) 11100001 b) 11001101

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_________ is the term refers to the process of locating the place of error 1

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and correcting accordingly.
a) Dry Run b) Testing
c) Debugging d) Compiling
8. This operator returns Boolean value after comparing the memory 1
locations of two objects. Identify the operator.
a) is b) =
c) = = d) in
9. Evaluate: print((3 + 4 * 2) - 5 / (1 + 1) % 2 ** 2) 1
a) 7.0 b) 8.5

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c) 1 d) 7
10. Consider the following Python code: 1
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x,y = 10,0
result = x / y
What type of error will occur when this code is executed?
a) Logical Error b) Semantic Error
c) Syntax Error d) Runtime Error
11. A ___________ statement skips the rest of the current loop iteration and 1
proceeds with the next iteration.
a) break b) continue
c) jump d) pass
12. Which keyword is used to add an alternative condition to an if statement 1
in Python?
a) else if b) elseif
c) elif d) otherwise
13. What is the output of print("ABC"<"abc") ? 1
a) True b) False
c) 0 d) Error
14. Which of the following function will raise an error if the given substring 1
is not found in the string?
a) find() b) index()
c) replace() d) All of these
15. Which of the following function will return the last three characters in a 1
string s?
a) s[3:] b) s[:3]
c) s[-3:] d) s[:-3]

Answer the given questions briefly
16. What would be the output produced if for the following code, the input 1
given is 11.
print(bool(input("Input:")) and 10 < 13-2)
17. Define the term Syntax Error. 1
18. Use the Python range function to create the following list: [7,3,-1,-5] 1
19. What will be the output of the following Python code? 1
count = 0
while count < 10:
if count==5:
break
else:
print(count,end=' ')
count += 1
else:
print("Loop finished")
print("Out of Loop")

Question 20 & 21 are Assertion (A) and Reason (R) based questions.
Mark the correct choice as:
a) Both A and R are correct and R is the correct explanation of A.
b) Both A and R are correct but R is NOT the correct explanation of A
c) A is correct but R is incorrect
d) A is incorrect but R is correct.
20. Assertion (A): An if statement without an else block is a valid 1
statement in Python.
Reason (R): An if statement can execute a block of code conditionally,
and an else block is optional for handling the false condition.
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21. Assertion (A): Operators + and * can work with number as well as 1

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string.
Reason (R): Unlike numbers, for string + means concatenation and *
means replication.

Section-B (7 × 2=14 Marks)
22. Why is primary memory termed as “destructive write memory but non- 2
destructive read memory?
23. State Demorgan’s Theorems. Prove any one Theorem by using Truth 2
Table.
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24. What is difference between mutable and immutable date types? Explain 2

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with example.
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OR

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How is implicit conversion different from an explicit conversion?
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Rewrite the following program after removing the errors if any, any
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underline the correction(s).
Num=int("Enter a Number-")
for I in range[0,10]
if Num = I:
print("Both are equal")
Else:
print("Both are not equal")
OR
Write the output for the following code:

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var = 7
while var > 0:

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print ('Current variable value: ', var)
var = var -1
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if var == 3:
break
else:
if var == 6:
var = var -1
continue
print ("Good bye!")
26. Re-write the following program using while loop. 2
sum_even = 0

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for i in range(2, 21, 2):

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sum_even += i

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print("Sum:", sum_even)

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Write the output for the following code. 2

s e Text="gmail@com"
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L=len(Text)

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nText=""
for i in range (0,L):
if Text[i].isupper():
nText=nText+Text[i].lower()
elif Text[i].isalpha():
nText=nText+Text[i].upper()
else:
nText=nText+"bb"

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print(nText)

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OR

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Consider the following code write the output if the input is: 1bzz
Str=input("Enter a String-")
while len(Str) <=4:
if Str[-1] == 'z':
Str=Str[0:3]+'c'
elif 'a' in Str:
Str=Str[0]+'bb'
elif not int(Str[0]):
Str='I'+Str[1:]+'z'
else:
Str=Str+'*'
print(Str)
28. a. Which string method is used to return a copy of the string with the 1+1
first character capitalized?
b. What is the output for the statement?
s="abc1".replace("1", "")
s=s+"Hello\\nworld\'s"
print(len(s))

Section-C (3 × 3=9 Marks)
29. Anish is developing a fitness tracking app that recommends daily step 3
goals based on the Fibonacci pattern. The user inputs the number of
days they want to plan their workout. On each day, the step goal
increases following the Fibonacci sequence (starting from 0 and 1).
Draw a flowchart to generate this sequence up to N days.
OR
Consider the following code to write the output of the following code?
Explain reason.
A=3+5/8
B=int(3+5/8)
print(B)
C=3+float(5)/8
print(C)
D=3+5.0//8
print(D)
30. Write a program to calculate the sum of the series 3
S=1+1/8+1/27+….+1/n3
OR
Write a program to generate the following pattern with n number of
lines (without using string replication operator).
Example:
Enter the number of line: 4
Output:
a
ab
abc
abcd
31. Consider the following string. Write the statements in Python to 1×3
implement the following:
Str=”Green revolution”
a) To display the last four characters.
b) To check whether the string contains ‘vol’ or not.
c) To display the starting index for the substring ‘vo’
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OR

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Predict the String function which generates the following outputs if the
string st=" this is a python string "
i. " This Is A Python String "
ii. "this is a python string"
iii. " THIS IS A PYTHON STRING "

Section-D (4 × 4=16 Marks)
32. a) What is Unicode? Write different standards to represent Unicode 2+1+1
encoding scheme.
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b) Convert the following:

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i) (FACE)16 to Octal
ii) (1010100.011)2 to Decimal
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33.
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Evaluate the following. 1×4
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a) 12 + (3**4-6)//2
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b) 12 % 5 * 3 + (2*6)//4
c) (87 // 5.0) == int(87 / 5.0)
d)(2<10) and (10<2) or (3<8) and not (3<-3)
34. Write a program to accept a number and check whether the number is a 4
palindrome or not. Display the message accordingly.
(A number is said to be a palindrome if the new number obtained after
reversing the digits is the same as the original number.)
Sample input: 707
Sample output: 707 is a palindrome number

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OR
A cloth showroom announced the following festival discounts and the

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assured gifts on the purchase of items, based on the total cost of the
items purchased.
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Total Cost Discount (on Total Assured Gift
cost)
Less than or upto Rs 2000 5% Wall Clock
Rs 2001 to Rs 5000 10% School Bag
Rs 5001 to 10000 15% Electric Iron
More than Rs 10000 20% Wrist Watch
Write a Python code to input the total cost of the items purchased.
Calculate and display the discount and amount to be paid along with
assured gift.

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35. Consider the following and Answer the questions below. 1×

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String = "Programming in Python is Fun"

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Write statements in python to implement the following:

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a) To replace all the occurrences of space in the string with “*”
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b) To extract all the words of the string in a list form.

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c) To count number of P appears in the above string.
d) To repeat the string 2 times.
Section-E (2 × 5=10 Marks)
36. a) Write a program in Python to Enter name and marks in 3 subjects of a 2+3
student and find the grade of a student as per the following.
Percentage of Marks Grade
Above 90% A
80 % to 90% B
70% to 80% C

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60% to 70% D
Below 60% E
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b) Write a program in Python to accept a number and check it is a
special number or not.
A number is a special number if the sum of the factorial of its digits is
equal to the original number.
Examples:
145 is a special number because
1! + 4! + 5! = 1 + 24 + 120 = 145
37. a) Write a program in Python to enter a string and display the longest 3+2
word in the string.
b) Write a program to enter a string and capitalize every other letter in
the string and then print it.

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