sample paper computer science2024-25 | Exams Computer science

OXALISS INTERNATIONAL SCHOOL (CBSE), THATCHUR.

Computer Science (083)

CYCLIC TEST – IV (2024-25)

COMPUTATIONAL PROGRAMMING - PYTHON

Class: XII Max. Marks: 70

Date : Time : 3 Hrs.

General Instructions:

 This question paper contains 37 questions.

 All questions are compulsory. However, internal choices have been provided in some

questions. Attempt only one of the choices in such questions

 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.

 Section B consists of 7 questions (22 to 28). Each question carries 2 Marks.

 Section C consists of 3 questions (29 to 31). Each question carries 3 Marks.

 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.

 All programming questions are to be answered using Python Language only.

 In case of MCQ, text of the correct answer should also be written.

SECTION – A

Q No.

Section-A (21 x 1 = 21 Marks)

Marks

1.

Find the invalid identifier from the following:

a) None b) Name_12 c) _123num d) true

1

2.

Which of the following are random number generators ?

(a) randint() (b) randrange() (c) random() (d) All of these

1

3.

What will be the value of X in the following Python expression?

X = 2+9*((3*12)-8)/10

a) 30.0 b) 30.8 c) 28.4 d) 27.2

1

4.

In Python, ………….. defines a block of statements.

a) Block b) loop c) indentation d) { }

1

5.

What will be the output of the following code?

num = [1, 2, 3, 4, 5]

for i in range(len(num)):

num[i] *= 2

print(num)

a) [1, 2, 3, 4, 5] b) [2, 4, 6, 8, 10] c) [1, 4, 9, 16, 25] d) [2, 3, 4, 5, 6]

1

6.

What will be the output of the following code snippet? message= "Hai Python"

print(message[-2::-2])

a) iyhn b) oiyH c) otPiH d) oyi

1

7.

Assume the tuple superstore is (10,20,30,40,50), which of the following is correct

syntax for slicing operation?

a) print(superstore[0:]) b) print(superstore[:2]) c) print(superstore[:-2])

d) All of these

1

8.

What is the output of the following code?

my_dict = {"apple": 3, "banana": 2, "cherry": 5}

keys = my_dict.keys()

print(keys)

a) ["apple", "banana", "cherry"] b) ["apple"]

c) ["banana"] d) dict_keys(["apple", "banana", "cherry"])

1

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OXALISS INTERNATIONAL SCHOOL (CBSE), THATCHUR.

Computer Science (083)

CYCLIC TEST – IV (2024-25)

COMPUTATIONAL PROGRAMMING - PYTHON

Class: XII Max. Marks: 70

Date : Time : 3 Hrs.

L=[11,12,23,34,45,56,65]

OR

29. Write a user-defined function div_5(N) which accepts a list of integers in a

parameter N and pushes all those integers which are divisible by 5 from the list

N into a Stack named FactNumbers. Write function pop_div5() to pop the

topmost number from the stack and returns it. If the stack is already empty, the

function should display "Empty". Write function Disp_div5() to display all element

of the stack without deleting them. If the stack is empty, the function should

display 'None'.

For example:

If the integers input into the list VALUES are: [10, 5, 18, 35, 112]

Then the stack FactNumbers should store: [10, 5, 35]

30. A text file “Book.txt” contains a paragraph. Write a Python function that searches

for a given character and reports the number of occurrence of the character in the

file.

OR

Consider a file “Story.txt” whose content is as shown below:

Ravi has gone to his friend’s house.

His friend’s name is Rakhi.

Her house is far from his house.

Write a Python function CountHisHer() which reads the contents of the text file

“Story.txt” and counts the words His and Her (not case sensitive).

31. Consider a stack named ItemStack that contains records of items in a shop. Each

item record is represented as a list containing item_no , item _name , and

item_price.

Write the following user-defined functions in Python to perform the specified

operations on the stack ItemStack :

(I) push_item(ItemStack, new_item): This function takes the stack ItemStack and a

new item record new_item as arguments and pushes the new item record onto the

stack.

(II) pop_item(ItemStack): This function pops the topmost item record from the

stack and returns it. If the stack is already empty, the function should display

"Underflow".

(III) peep(ItemStack): This function displays the topmost element of the stack

without deleting it. If the stack is empty, the function should display 'None'.

32. i) Predict the output of the code given below:

s="Welcome2cs@JNV"

n=len(s)

m=""

for i in range(0,n):

if(s[i]>='a' and s[i]<='m'):

m+=s[i].upper()

elif(s[i]>='n' and s[i]<='z'):

m+=s[i-1]

elif(s[i].isupper()):

m+=s[i].lower()

else:

m+='&'

print("The string is: ",m)

print("The new string is: ",m[::-2])

OR

35. Write a function in Python to search and display details, whose destination is

“Cochin” from binary file “Bus.dat”. Assuming the binary file is containing the

following elements in the list:

1. Bus Number

2. Bus Starting Point

3. Bus Destination

OR

Consider a binary file “Salary.dat” that has structure*Employee id, Employee

name, Salary]. Write a function countrec() in Python that would read contents of

the file “Salary.dat” and display the details of those employees whose salary is

above 20000 and less than 50000.

36. Consider the following csv file and the code fragment associated with the

following csv file :

SLNO BOOKNAME PRICE

import csv

f=open("c:\stud.csv")

fobj=csv.reader(f)

for k in fobj:

for j in k:

parameter `N` and pushes all those integers which are divisible by 5 from the list

`N` into a Stack named `FactNumbers`. Write function pop_div5() to pop the

If the integers input into the list `VALUES` are: [10, 5, 18, 35, 112]

Then the stack `FactNumbers` should store: [10, 5, 35]

ALL THE BEST **