Class 12 PT I Question Paper 2025-26 Computer Science

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UNIT TEST- JUL 2025 , XII , COMPUTER SCIENCE (083)
MM: 40 ​ TIME: 90 MIN
General Instructions: i) All questions are compulsory. ​ ​
ii) Programming Code Language: Python Programming Language
[1] a) 1
Find the invalid identifier from the following​
a) abc b) True c) 2ndabc d) ab_c

b) 1
What is the local variable in context of python function?

c) 1
What is the value of the python expression:​
>> 23 ** 4 + 5​
a) Syntax Error​
b) 374658​
c) 267383​
d) none of these

d) Write the following mode that will be used for opening the following 1
files​
a) a text file “example.txt” in both read and write mode​
b) a binary file “bfile.dat” in write mode​
c) a text file “try.txt” in append and read mode​
d) a binary file “btry.dat” in read only mode.

e) 1
What is the global variable ?

f) 1
The keyword to declare / define the function :​
a) module_func ​ b) func ​ c) def ​ d) def_func

g) 1
def interest( p , r=0.1, t=2):​
​ …………
Above function declaration is an example of ..​
a) function calling b) default function ​
c) function having default argument d) none of these

h) 1

Which module should be imported in python program to access and
show randomly generated value. ?

i) 1
What are mutable types?

j) 1
Give the example(s) of immutable data types.

[2] a) Find and write the output of the following code 3
def Display(str):
​ m=""
​ for i in range(0,len(str)):
​ if(str[i].isupper()):
​ m=m+str[i].lower()
​ elif str[i].islower():
​ m=m+str[i].upper()
​ else:
​ if i%2==0:
​ m=m+str[i-1]
​ else:
​ m=m+"#"
​ print(m)
Display('abcdefghijksfh@643hhctik')
b) 1
The mode allows you to open the file in append mode.​
i) r ​ii) a ​ iii) b ​ iv) w

c) 2
Name the built-in function / method that is used to return an absolute
value of a number.

d) 2
If the following code is executed, what will be the output of the
following code?
​ name="csxiiajul2025"
​ print(name[3:10])

e) 1
Name the module which can be used to access Binary File.

f) 1
Consider the below given function header. Identify the error ?
def interest( p=1000, r , t=2):

g) 2
Consider the following Problem:​
“Write the method in python to display the elements of list thrice if it
is a number and display the element terminated with ‘#’ if it is not a
number.”​
Now Consider the following code, which attempts to solve the given
problem:

def show_elements(lst):​
​ for elem in lst:
​ if elem.isdigit( ):
​ print( ………………. ) ​#Line 1
​ else:
​ print( elem + ‘#’ )

Write the python statement/code/expression to correctly fill in the
blanks.

h) 2
Differentiate between actual parameter(s) and a formal parameter(s)
with a suitable example for each.

i) Rewrite the following code after removing the syntax error(s), 2
underline the correction(s) made:
x=23
For y in range(30)
​ z=x+y
​ print(z)
print(x+2)
[3] a) 3
Write a command(s) to input the text from user and write the text to
the text file named abc.txt. Assume that the file is opened in append
mode.​
“”

b) 3
Write a function bcCount(), which should read each character of a text
file STORY.TXT, should count and display the occurrence of
alphabets B and C (including small cases b and c too).

c) 3
Discuss the syntax and use of sqrt( ) function of the math module.

What will happen if a negative number is passed as an argument to the
function.

[4] a) 1
Which of the following function(s) are in the math module?​
(A) fabs( ) (B) len( ) (C) sin( ) (D) random( )

b) Write a function to search and display details, whose destination is “Sitapur” 4
from the binary file “movie.dat”. Assuming the binary file is containing the
following elements in the list: ​
1. Movie name​
2. Movie start time​
3. Movie duration

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