CBSE Class 12 Computer Science Data File Handling Worksheet

Question. The ____________ method returns a list containing each line of the file as a list item.
a) read()
b) readline()
c) readlines()
d) readone()

Answer : C

Question. We can use readline( ) function which can read one line at a time from the file.
a) read()
b) readline()
c) readlines()
d) readone()

Answer : B

Question. The ________ method in Python file handling clears the internal buffer of the file..
a) close()
b) flush()
c) clear()
d) open()

Answer : B

Question. Which of the following options can be used to read the first line of a text file Myfile.txt?
a) myfile = open(‘Myfile.txt’); myfile.read()
b) myfile = open(‘Myfile.txt’,’r’); myfile.read(n)
c) myfile = open(‘Myfile.txt’); myfile.readline()
d) myfile = open(‘Myfile.txt’); myfile.readlines()

Answer : C

Question. Suppose content of ‘Myfile.txt’ is Culture is the widening of the mind and of the spirit. What will be the output of the following code?
myfile = open(“Myfile.txt”)
x = myfile.read()
y = x.count(‘the’)
print(y)
myfile.close()
a) 2
b) 3
c) 4
d) 5

Answer : B

Question. If we want to write a sequence of strings,list, tuple into the file then we use _________ function.
a) write()
b) writelines()
c) writerow()
d) append()

Answer : B

Question. Python automatically flushes the file buffers before closing a file with close() function.
a) True
b) False

Answer : A

9. To create a new file or to write on an existing file after truncating / overwriting its old content , file has to be opened in _______ access mode
a) “w+”
b) “a+”
c) “r+”
d) “wb”

Answer : A

Question. To open a file for reading any of the following statement can be used :
a) f = open(“demofile.txt”)
b) f = open(“demofile.txt”, “rt”)
c) f = open(“demofile.txt”, “r”)
d) All of the above

Answer : D

Question. read() and readline() functions can be used for reading no of characters from file if size is mentioned.
a) read() and readline()
b) readlines() and readline()
c) read() and readlines()
d) None of the above

Answer : A

Question. Suppose content of ‘Myfile.txt’ is
Humpty Dumpty sat on a wall
Humpty Dumpty had a great fall
All the king’s horses and all the king’s men
Couldn’t put Humpty together again
What will be the output of the following code?
myfile = open(“Myfile.txt”)
record = myfile.read().split()
print(len(record))
myfile.close() 
a) 24
b) 25
c) 26
d) 27

Answer : C

Question. Suppose content of ‘Myfile.txt’ is: Twinkle twinkle little star How I wonder what you are Up above the world so high Like a diamond in the sky What will be the output of the following code?
myfile = open(“Myfile.txt”)
data = myfile.readlines()
print(len(data))
myfile.close()
a) 3
b) 4
c) 5
d) 6

Answer : B

Question. To read twelve characters from a file object fin we use ________
a) fin.read(12)
b) fin.read()
c) fin.readline()
d) read(12)

Answer : A

Question. Which of the following options can be used to read the whole content of a text file Myfile.txt?
a) myfile = open(‘Myfile.txt’); myfile.read()
b) myfile = open(‘Myfile.txt’,’r’); myfile.read(n)
c) myfile = open(‘Myfile.txt’); myfile.readline()
d) myfile = open(‘Myfile.txt’); myfile.readlines()

Answer : A

CASE STUDY QUESTIONS 

Rahul is trying to perform write the data to a text file. He is not sure of the commands to be used. Hence partially he could write the program . Help him to complete the program.
file1 = open(“myfile.txt”, ____)#line 1
L = [“This is Delhi \n”, “This is Paris \n”, “This is London”]
file1._________(L) #line 2
file1.close()
file1 = open(“myfile.txt”, _____)#line 3 opening file to add new data to existing file.
# writing newline character
file1.write(“\n”)
file1._________(“Today”)#line 4 

Question. Which access mode to be used in line 1 to open the file for writing on to file.
a) w
b) w+
c) wr+
d) a

Answer : A

Question. Which access mode to be used in line3 to open the file for writing new content on existing file without any data loss.
a) w
b) w+
c) wr+
d) a

Answer : D

Question. Which function to be used in line 2 for writing a list to file.
a) write()
b) writelines()
c) writerow()
d) writeline()

Answer : B

Question. Which function to be used in line4 for writing a list to file.
a) write()
b) writelines()
c) writerow()
d) writeline()

Answer : A
 

Teacher has developed a program to count how many lines start with “T” in a text file “story.txt”. To choose correct option for executing program successfully.
def countlines():
file= _______ (“story.txt”) #line1
data = __________ #line2
__________# line 3
for I in data :
if _______ : # line4
c+=1
print(“Number of lines start with T “, _____) #line5

Question. Which function is used to read the content from the file
a) file.read()
b) readline()
c) file.readlines()
d) file.readline()

Answer : C

Question. choose correct condition for line3
a) i==’T’
b) i[0]==’T’
c) “i”==T
d) i[0]==T

Answer : B

Question. Which function to be used to complete line 1
a) Read()
b) open()
c) read()
d) Open()

Answer : B

Question. complete the line4
a) c
b) count
c) I
d) data

Answer : A

Question. Line3- initialize the variable for count
a) c=0
b) c=c+1
c) both
d) none

Answer : A
 

Atif has been asked by his senior to complete the following code. The code uses a text file namely message.txt.
def count_words(filename):
Bigwords=0
F=open(filename,‟r‟)
Data=F.___________ # line 1
words = _____________ # line 2
For w in words :
__________ # line 3
___________# line 4
return bigwords, len(words)
_______ # line 5
print(“total number of words : “,count)
print(“No. of big words :”,big) 

Question. Which function is used to read all the content of the file for line1 and store in Data variable in string format.
a) readline()
b) read(file)
c) read()
d) readlines()

Answer : C

Question. Which option is correct for completing line 3 and line 4 so that the count of words having length more than 8 characters.
a) If w>8 :
bigwords+=1
b) if len(w) >8:
bigwords+=1
c) if len(w) >=8:
bigwords+=1
d) if len(w) >8:
bigwords+=1

Answer : B

Question. Which option is correct for completing line 2
a) Data.split()
b) Data.Split()
c) f.split()
d) None of the above

Answer : A

Question. Which option is correct for completing line 5 so that function count_words() is called.
a) big ,count= count_words(filename)
b) big ,count= count_words(“message.txt”)
c) big _count=count_words(“message.txt”)
d) big=count_words(“message.txt”) count=count_words(“message.txt”)

Answer : B
 

Anisha wants to develop a program to count the number of “Me” or “My” words present in a text file “STORY.TXT” .But she is not sure about the code . Help her to complete it.
def displayMeMY(): n=0 f=open(“story.txt” , „____‟) #line 1
N = __read() #line 2
M = N.________ #line 3
for x in M :
if ____________________: #line 4
n=n+1 f.________ #line 5 Closing the file.
print(“Count of Me /My words : “, ____) #line 6 

Question. Fill the line 2 by suitable option
a) F.
b) f.
c) n.
d) N.

Answer : B

Question. select the correct option to complete the line 4
a) x==me or x== my
b) x==”me” or “my”
c) x==”Me” or x==”My”
d) x==[“Me”,”My”]

Answer : C

Question. Which method to be used to complete the line 3
a) readline()
b) split()
c) write()
d) writelines()

Answer : B

Question. Which function is used to complete line 5.
a) Exit()
b) close()
c) end()
d) Close()

Answer : B

Question. Which access mode to be used in line 1 to open the file .
a) w
b) r
c) rb
d) a

Answer : B

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