Class 11 Question Paper 2023-24 Computer Science (Half Yearly)

2023-24
HALF YEARLY
EXAM
NCERT BASED
SYLLABUS
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FOR
CBSE BOARD
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Half Yearly Exam 2023-24
Question Paper

Class - XI Subject – Computer Science
Time – 3 Hours Maximum Marks - 70

General Instructions:
(i) This question paper contains five sections, Section A to E.
(ii) All questions are compulsory.
(iii) Section A has17 questions carrying 1 mark each.
(iv) Section B has 6 Very Short Answer type questions carrying 2 marks each.
(v) Section C has 6 Short Answer type questions carrying 3 marks each.
(vi) Section D has 3 long Answer type questions carrying 5 marks each.
(vii) Section E has 2 questions carrying 4 marks each.
(viii) All programming questions are to be answered using Python Language only.

SECTION-A

1. Which of the following falls under utilities? [1]
(a) Text editor (b) Backup (c) Disk defragmenter (d) All of these
2. Which of the following memory types will store data or information permanently? [1]
(a) RAM (b) Cache (c) Hard disk (d) All of these
3. ______ is capable of recognizing a pre-specified type of mark made with dark pencil or ink. [1]
(a) OCR (b) OMR (c) MICR (d) Bar Code Reader
4. Convert (43)10 into binary number system: [1]
(a) (101011)2 (b) (110011)2
(c) (110101)2 (d) (110010)2
5. Which numbering system uses numbers and letters as symbols? [1]
(a) Decimal (b) Binary (c) Octal (d) Hexadecimal
6. The expression of NAND gate is _________ [1]
(a) A.B (b) A’B+AB’ (c) (A.B)’ (d) (A+B)’

7. Python language is _______________ [1]
(a) Free (b) Open Source (c) Free & Open Source (d)Proprietary
8. What will be the output of the following snippet? [1]
x,y=2,6
x,y=y,x+2

print(x,y)
(a) 6 6 (b) 4 4 (c) 4 6 (d) 6 4

1

9. Evaluate the following expressions: [1]
16-(4+2)*5+2**2**2
(a) 2 (b) -2 (c) 0 (d) 32
10. Identifier name cannot be composed of special characters other than…………. [1]
(a) # (b) Hyphen (-) (c) $ (d) Underscore (_)
11. Which of the following is/are not legal string operators? [1]
(a) in (b) + (c) * (d) /
12. Which of the following functions will return the last three characters of a string s? [1]
(a) s[3:] (b) s[:3] (c) s[-3:] (d) s[:-3]
13. Which method should I use to convert String “Python programming is fun” to “Python [1]
Programming Is Fun”?
(a) capitalize() (b) title() (c) istitle() (d) upper()
14. Guess the correct output of the following string operation. [1]
str1=’Wah’
print(str1*2)
(a) WahWah
(b) TypeError: unsupported operand type(s) for * : ‘str’ and ‘int’
(c) WWaahh
(d) Wah2
15. Write the output of the following: [1]
a=”Blog”
a=”a”
print(a)
(a) Error (b) Blog (c) a (d) Bloga
16. Assertion (A): The range() function is used with the for loops only. [1]
Reason (R): It is a built in function that accepts three parameters viz. initial value. Stop
value, update. By default, the initial and update values are 0 (zero) and 1 (one) respectively.
Based on the above discussion, choose an appropriate statement from the options given
below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and Ris not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
17. Assertion (A): The process of repeating a set of elements in a string is termed as replication.
Reason (R): This task is performed using (*) operator along with a number that specifies the [1]
number of replications.
Based on the above discussion, choose an appropriate statement from the options given
below:
(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

2

SECTION-B

18. Draw a circuit diagram corresponding to the following Boolean expression: [2]
P.Q’+P’.R
19. What is comment in python? How will you write comment in python? [2]
20. Write any two advantages and any two limitations of python. [2]
OR
What do you mean by break and continue statement in python? Explain with an
example.
21. Write a program to generate Fibonacci series upto n terms. [2]
22. Predict the output of the following codes: [2]
a=1
s=0
while (a<=10):
n=int(input(“enter a number:”))
s=s+n
a=a+3
if(a==4):
continue
print(s)
when n=5,10,15,20
23. Write a program to enter a character and display if it is an uppercase character, [2]
lowercase character, digit or special character.

SECTION-C
24. What do you mean by operating system? Explain any four functions of an operating [3]
system.
25. State De Morgan’s law and prove it with a truth table. [3]
26. Explain the following terms: [3]
(a) keywords (b) Identifiers (c) implicit conversion
27. Write a program to perform the following task according to the user’s choice using [3]
menu.
(a) Area of circle
(b) Area of rectangle
(c) Circumference of circle
28. Write a python code to enter a sentence. Frame a word by joining all the first characters [3]
of each word of the sentence. Display the word.
Sample Input: Read Only Memory
Sample Output: ROM
29. Write a python code to input a number and check whether it is a prime number or not. If [3]

it is not a prime then display the next number that is prime.
Sample Input: 14
Sample Output: 17

3

SECTION-D
30. (i) Convert the following hexadecimal numbers to decimal: [5]
(a) B6 (b) A13D
(ii) Convert the following hexadecimal numbers to octal:
(a) 28AC (b) 4FD6
(iii) Convert the following binary numbers to octal:
(a) 100111011 (b) 1110100111
(iv) Convert the following decimal numbers to binary:
(a) 1265.25 (b) 766.75
(v) Add the following binary numbers:
(a) 1011011 and 1100101 (b) 1110, 11011 and 10110
31. (i) Write a programme to enter a number and check whether it is Armstrong number [2+3]
or not.
(ii) Write a program to find the sum of the geometric series given below:
S=a+ar+ar2+ar3+ar4+……………………arn
32. (i) Write a program to enter a string and check whether it is palindrome or not. [2+3]
(ii) Write a program that reads a string and displays the longest substring of the given
string.
SECTION-E

33. Consider the string str1=”Global Warming”. [4]
Write statements in python to implement the following :
(i) To display the last four characters.
(ii) To replace all the occurrence of letters ‘a’ in the string with “*”.
(iii) Change the case of each letter in string str1.
(iv) Whether ‘b’ exists in string str1 or not.
34. Predict the output of the following codes:
(i) val = 10
total = 0
for count in range (1,val,3):
total = total + count
if count % 2 = = 0:
print (count * 10)
else:
print (count)
print (total)
(ii) a,b=1,10
while a<b:
print(a*a,b)
a=a+1

b=b-1

4

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