CBSE Sample Paper Computer Science Class XII (Term I) 15

4. File Handling
Direction (Q. Nos. 1-15) Each of the question has four options out of which only one is correct.
Select the correct option as your answer.
1. To read three characters from a file object f, we use ……… .
(a) f.read(3) (b) f.read() (c) f.readline() (d) f.readlines()

2. How do you get the current position within the file?

(a) fp.seek() (b) fp.tell() (c) fp.loc() (d) fp.pos()

3. The files that consists of human readable characters

(a) binary file (b) text file (c) Both (a) and (b) (d) None of these

4. Which function is used to write a list of string in a file?

(a) writeline() (b) writelines() (c) writestatement() (d) writefullline()

5. What will be the output of the following Python code?

myFile = None
for i in range (8):
with open(“data.txt”, “w”) as myFile:
if i > 5:
break
print(myFile.closed)
(a) True (b) False (c) None (d) Error
6. What is the use of seek() method in files?
(a) Sets the file’s current position at the offset
(b) Sets the file’s previous position at the offset
(c) Sets the file’s current position within the file
(d) None of the mentioned

7. What will be the output of the following Python code?

myFile = open(“story.txt”, “wb”)
print(“ Name of the file: ”, myFile.name)
myFile.flush()
myFile.close()
(a) Compilation error (b) Runtime error
(c) No output (d) Flushes the file when closing them
Suppose the content of the file ‘‘story.txt’’ is
Education Hub
Learning is the key of success.
8. What is the output of following code?
myfile=open(‘story.txt’,‘r’)
THE QUALIFIERS

s=myfile.read(10)
print(s)
s1=myfile.read(15)
print(s1)
myfile.close()
(a) Education (b) Education
Hub Learning is Hub
Learning is
16 CBSE Sample Paper Computer Science Class XII (Term I)

(c) Education (d) Education Hub

Hub Learning is
Learning
is
9. What is the output of following code?
f=open(‘story.txt’, ‘r’)
s=f.readline()
lcount=len(s)
print(lcount)
f.close( )
(a) 4 (b) 2 (c) 1 14 (d) 8

10. What is the output of following code?

f=open(‘story.txt’, ‘r’)
str=“ ”
s=0
ts=0
while str:
str=f.readline()
ts=ts+len(str)
print(ts)
f.close()
(a) 44 (b) 43 (c) 37 (d) 45

11. What is the output of following code?

def test () :
s=open (“story.txt”, “r”)
f=s.read()
z=f.split( )
count=0
for i in z:
count=count+1
print(count)
(a) 7 (b) 8 (c) 5 (d) 9
Suppose the content of file ‘‘Para.txt’’ is
Education Hub
Electronic learning
Learning is the key of success.

12. What is the output of following code?

def test() :
THE QUALIFIERS

f=open (“Para.txt”, “r”)

lines=0
l=f.readlines( )
for i in l:
if i [0] = = ‘E’ :
lines+=1
print(lines)
(a) 2 (b) 1 (c) 3 (d) Error
CBSE Sample Paper Computer Science Class XII (Term I) 17

13. What is the output of following code?

def myFunc() :
f=open (“Para.txt”, “r”)
count=0
x=f.read()
word=x.split()
for i in word:
if (i!=“learning”):
count=count+1
print(count)
myFunc()
(a) 2 (b) 10 9 (c) 8 (d) Error

14. What is the output of following code?

def test():
f=open(“Para.TXT”)
n1=0
n2=0
while True:
l=f.readline()
if not l:
break
for i in l:
if (i==‘E’ or i==‘e’):
n1=n1+1
elif(i==‘C’ or i==‘c’) :
n2=n2+1
print(n1)
print(n2)
f.close()
(a) 8 (b) 8 (c) 3 (d) Error
5 4 7
15. What is the output of following code?
def Func():
with open(‘Para.txt’, ‘r’) as f :
l=f.readlines()
f.close( )
print(l)
del l[3]
print (l)
f=open (‘Para.txt’, ‘w’)
f.writelines(l)
THE QUALIFIERS

f.close( )
(a) Delete the 3rd word from file (b) Delete the 4th word from file
(c) Delete the 3rd word from file at end (d) Error

Answers For Detailed Solutions

1. (a) 2. (b) 3. (b) 4. (a) 5. (a)
Scan the code
6. (a) 7. (d) 8. (b) 9. (b) 10. (a)
11. (b) 12. (a) 13. (c) 14. (a) 15. (b)
18 CBSE Sample Paper Computer Science Class XII (Term I)

CBSE
QUESTION BANK
Case Study Based Questions

1. Rohit, a student of Class 12th, is learning CSV File Module in Python. During examination, he has
been assigned an incomplete Python code (shown below) to create a CSV File ‘Student.csv’
(content shown below). Help him in completing the code which creates the desired CSV File.
CSV File
1,AKSHAY,XII,A
2,ABHISHEK,XII,A
3,ARVIND,XII,A
4,RAVI,XII,A
5,ASHISH,XII,A
Incomplete Code
import_____ #Statement 1
fh = open(_____, _____, newline=‘ ’) #Statement 2
stuwriter = csv._____ #Statement 3
data = []
header = [‘ROLL_NO’, ‘NAME’, ‘CLASS’, ‘SECTION’]
data.append(header)
for i in range(5):
roll_no = int(input(“Enter Roll Number : ”))
name = input(“Enter Name : ”)
class = input(“Class : ”)
section = input(“Enter Section : ”)
rec = [_____] #Statement 4
data.append(rec)
stuwriter. _____ (data) #Statement 5
fh.close()
(i) Identify the suitable code for blank space in line marked as Statement 1.
(a) csv file (b) CSV
CBSE QUESTION BANK

(c) csv (d) Csv

(ii) Identify the missing code for blank space in line marked as Statement 2.
(a) “School.csv”,“w” (b) “Student.csv”,“w”
(c) “Student.csv”,“r” (d) “School.csv”,“r”
(iii) Choose the function name (with argument) that should be used in the blank space of line marked
as Statement 3.
(a) reader(fh) (b) reader(MyFile)
(c) writer(fh) (d) writer(MyFile)
(iv) Identify the suitable code for blank space in line marked as Statement 4.
(a) ‘ROLL_NO’, ‘NAME’, ‘CLASS’, ‘SECTION’ (b) ROLL_NO, NAME, CLASS, SECTION
(c) ‘roll_no’,‘name’,‘class’,‘section’ (d) roll_no,name,class,section
CBSE Sample Paper Computer Science Class XII (Term I) 19

(v) Choose the function name that should be used in the blank space of line marked as Statement 5 to
create the desired CSV file?
(a) dump() (b) load() (c) writerows() (d) writerow()

2. Amritya Seth is a programmer, who has recently been given a task to write a Python code to
perform the following binary file operations with the help of two user defined
functions/modules:
(a) AddStudents() to create a binary file called STUDENT.DAT containing student information –
roll number, name and marks (out of 100) of each student.
(b) GetStudents() to display the name and percentage of those students who have a percentage
greater than 75. In case there is no student having percentage > 75, the function displays an
appropriate message. The function should also display the average percent.
He has succeeded in writing partial code and has missed out certain statements, so he has left
certain queries in comment lines. You as an expert of Python have to provide the missing
statements and other related queries based on the following code of Amritya.
import pickle
def AddStudents():
____________ #1 statement to open the binary file to write data
while True:
Rno = int(input(“Rno :”))
Name = input(“Name:”)
Percent = float(input(“Percent :”))
L = [Rno, Name, Percent]
____________ #2 statement to write the list L into the file
Choice = input(“enter more (y/n): ”)
if Choice in “nN”:
break
F.close()
def GetStudents():
Total=0
Countrec=0
Countabove75=0
with open(“STUDENT.DAT”,“rb”) as F:
while True:
try:
____________ #3 statement to read from the file
Countrec+=1
Total+=R[2]
if R[2] > 75:
CBSE QUESTION BANK

print(R[1], “ has percent = ”,R[2])

Countabove75+=1
except:
break
if Countabove75==0:
print(“There is no student who has percentage more than 75”)
average=Total/Countrec
print(“average percent of class = ”,average)
AddStudents()
GetStudents()
20 CBSE Sample Paper Computer Science Class XII (Term I)

Answer any four questions (out of five) from the below mentioned questions.
(i) Which of the following commands is used to open the file “STUDENT.DAT” for writing only in
binary format? (marked as #1 in the Python code)
(a) F= open(“STUDENT.DAT”,‘wb’) (b) F= open(“STUDENT.DAT”,‘w’)
(c) F= open(“STUDENT.DAT”,‘wb+’) (d) F= open(“STUDENT.DAT”,‘w+’)
(ii) Which of the following commands is used to write the list L into the binary file
‘STUDENT.DAT’? (marked as #2 in the Python code)
(a) pickle.write(L,f) (b) pickle.write(f, L)
(c) pickle.dump(L,F) (d) f=pickle.dump(L)
(iii) Which of the following commands is used to read each record from the binary file
‘STUDENT.DAT’? (marked as #3 in the Python code)
(a) R = pickle.load(F) (b) pickle.read(r,f) (c) r= pickle.read(f) (d) pickle.load(r,f)
(iv) Which of the following statement(s) are correct regarding the file access modes?
(a) ‘r+’ opens a file for both reading and writing. File object points to its beginning.
(b) ‘w+’ opens a file for both writing and reading. Adds at the end of the existing file, if it exists and
creates a new one, if it does not exist.
(c) ‘wb’ opens a file for reading and writing in binary format. Overwrites the file, if it exists and
creates a new one, if it does not exist.
(d) ‘a’ opens a file for appending. The file pointer is at the start of the file, if the file exists.
(v) Which of the following statements correctly explain the function of seek() method?
(a) Tells the current position within the file.
(b) Determines if you can move the file position or not.
(c) Indicates that the next read or write occurs from that position in a file.
(d) Moves the current file position to a given specified position

3. Krrishnav is looking for his dream job but has some restrictions. He loves Delhi and would take a
job there, if he is paid over ` 40000 a month. He hates Chennai and demands at least ` 100000 to
work there. In any another location, he is willing to work for ` 60000 a month. The following code
shows his basic strategy for evaluating a job offer.
pay= _________
location= _________
if location == “Mumbai”:
print (“I’ll take it!”) #Statement 1
elif location == “Chennai”:
if pay < 100000:
print (“No way”) #Statement 2
else:
print(“I am willing!”) #Statement 3
elif location == “Delhi” and pay > 40000:
print(“I am happy to join”) #Statement 4
elif pay > 60000:
CBSE QUESTION BANK

print(“I accept the offer”) #Statement 5

else:
print(“No thanks, I can find something better”) #Statement 6
On the basis of the above code, choose the right statement which will be executed when different
inputs for pay and location are given.
(i) Input: location = “Chennai”, pay = 50000
(a) Statement 1 (b) Statement 2
(c) Statement 3 (d) Statement 4
(ii) Input: location = “Surat” ,pay = 50000
(a) Statement 2 (b) Statement 4
(c) Statement 5 (d) Statement 6
CBSE Sample Paper Computer Science Class XII (Term I) 21

(iii) Input : location = “Any Other City”, pay = 1

(a) Statement 1 (b) Statement 2
(c) Statement 4 (d) Statement 6
(iv) Input : location = “Delhi”, pay = 50000
(a) Statement 6 (b) Statement 5
(c) Statement 4 (d) Statement 3
(v) Input : location = “Lucknow”, pay = 65000
(a) Statement 2 (b) Statement 3
(c) Statement 4 (d) Statement 5

4. Consider the following code and answer the questions that follow:
Book={1:‘Thriller’, 2:‘Mystery’, 3:‘Crime’, 4:‘Children Stories’}
Library ={‘5’:‘Madras Diaries’,‘6’:‘Malgudi Days’}
(i) Ramesh needs to change the title in the dictionary book from ‘Crime’ to ‘Crime Thriller’. He has
written the following command:
Book[‘Crime’]=’Crime Thriller’
But he is not getting the answer. Help him choose the correct command:
(a) Book[2]=‘Crime Thriller’ (b) Book[3]=‘Crime Thriller’
(c) Book[2]=(‘Crime Thriller’) (d) Book[3] =(‘Crime Thriller’)
(ii) The command to merge the dictionary Book with Library the command would be:
(a) d=Book+Library (b) print(Book+Library)
(c) Book.update(Library) (d) Library.update(Book)
(iii) What will be the output of the following line of code:
print(list(Library))
(a) [‘5’,‘Madras Diaries’,‘6’,‘Malgudi Days’] (b) (‘5’,’Madras Diaries’,‘6’,‘Malgudi Days’)
(c) [‘Madras Diaries’,‘Malgudi Days’] (d) [‘5’,‘6’]
(iv) In order to check whether the key 2 is present in the dictionary Book, Ramesh uses the following
command:
2 in Book
He gets the answer ‘True’. Now to check whether the name ‘Madras Diaries’ exists in the
dictionary Library, he uses the following command:
‘Madras Diaries’ in Library
But he gets the answer as ‘False’. Select the correct reason for this.
(a) We cannot use the in function with values. It can be used with keys only.
(b) We must use the function Library.values() along with the in operator.
(c) We can use the Library.items() function instead of the in operator.
(d) Both (b) and (c)
(v) With reference to the above declared dictionaries, predict the output of the following code
fragments.
CBSE QUESTION BANK

Code 1 Code 2
Library=Book Library=Book.copy()
Library.pop(2) Library.pop(2)
print(Library) print(Library)
print(Book) print(Book)

(a) Code 1 Code 2

{1: ‘Thriller’, 2: ‘Mystery’, 3: {1: ‘Thriller’, 3: ‘Crime’, 4:
‘Crime’, 4: ‘Children Stories’} ‘Children Stories’}
{1: ‘Thriller’, 2: ‘Mystery’, 3: {1: ‘Thriller’, 3: ‘Crime’, 4:
‘Crime’, 4: ‘Children Stories’} ‘Children Stories’}
22 CBSE Sample Paper Computer Science Class XII (Term I)

(b) Code 1 Code 2

{2:‘Mystery’} {1: ‘Thriller’, 3: ‘Crime’, 4:
‘Children Stories’}
{1: ‘Thriller’, 2: ‘Mystery’, 3: {1: ‘Thriller’, 3: ‘Crime’, 4:
‘Crime’, 4: ‘Children Stories’} ‘Children Stories’}

(c) Code 1 Code 2

{1: ‘Thriller’, 3: ‘Crime’, 4: {1: ‘Thriller’, 3: ‘Crime’, 4:
‘Children Stories’} ‘Children Stories’}
{1: ‘Thriller’, 3: ‘Crime’, 4: {1: ‘Thriller’, 2: ‘Mystery’, 3:
‘Children Stories’} ‘Crime’, 4: ‘Children Stories’}

(d) Code 1 Code 2

{1: ‘Thriller’, 3: ‘Crime’, 4: {1: ‘Thriller’, 3: ‘Crime’, 4:
‘Children Stories’} ‘Children Stories’}
{1: ‘Thriller’, 2: ‘Mystery’, 3: {1: ‘Thriller’, 3: ‘Crime’, 4:
‘Crime’, 4: ‘Children Stories’} ‘Children Stories’}

5. Arun, during Practical Examination of Computer Science, has been assigned an incomplete
search() function to search in a pickled file student.dat. The file student.dat is created by his
teacher and the following information is known about the file.
l
File contains details of students in [roll_no,name,marks] format.
l
File contains details of 10 students (i.e. from roll_no 1 to 10) and separate list of each student is
written in the binary file using dump().
Arun has been assigned the task to complete the code and print details of roll number 1.
def search():
f = open(“student.dat”,____) #Statement 1
____: #Statement 2
while True:
rec = pickle.____ #Statement 3
if(____): #Statement 4
print(rec)
except:
pass
____ #Statement 5
(i) In which mode, Arun should open the file in Statement 1?
(a) r (b) r+ (c) rb (d) wb
(ii) Identify the suitable code to be used at blank space in line marked as Statement 2.
(a) if(rec[0]==1) (b) for i in range(10) (c) try (d) pass
(iii) Identify the function (with argument), to be used at blank space in line marked as Statement 3.
CBSE QUESTION BANK

(a) load() (b) load(student.dat) (c) load(f) (d) load(fin)

(iv) What will be the suitable code for blank space in line marked as Statement 4.
(a) rec[0]==2 (b) rec[1]==2 (c) rec[2]==2 (d) rec[0]==1
(v) Which statement Arun should use at blank space in line marked as Statement 5 to close the file?
(a) file.close() (b) close(file) (c) f.close() (d) close()

6. Radha Shah is a programmer, who has recently been given a task to write a Python code to
perform the following CSV file operations with the help of two user defined functions/modules:
(a) CSVOpen() : to create a CSV file called BOOKS.CSV in append mode containing information of
books – Title, Author and Price.
(b) CSVRead() : to display the records from the CSV file called BOOKS.CSV where the field title
starts with ‘R’.
CBSE Sample Paper Computer Science Class XII (Term I) 23

She has succeeded in writing partial code and has missed out certain statements, so she has left
certain queries in comment lines.
import csv
def CSVOpen():
with open(‘books.csv’,‘______’,newline=‘ ’) as csvf: #Statement 1
cw=______ #Statement 2
______ #Statement 3
cw.writerow([‘Rapunzel’,‘Jack’,300])
cw.writerow([‘Barbie’,‘Doll’,900])
cw.writerow([‘Johnny’,‘Jane’,280])
def CSVRead():
try:
with open(‘books.csv’,‘r’) as csvf:
cr=______ #Statement 4
for r in cr:
if ______: #Statement 5
print(r)
except:
print(‘File Not Found’)
CSVOpen()
CSVRead()
You as an expert of Python have to provide the missing statements and other related queries
based on the following code of Radha.
Answer any four questions (out of five) from the below mentioned questions.
(i) Choose the appropriate mode in which the file is to be opened in append mode (Statement 1).
(a) w+ (b) ab (c) r+ (d) a
(ii) Which statement will be used to create a csv writer object in Statement 2?
(a) csv.write(csvf) (b) csv.writer(csvf)
(c) csvf.writer() (d) cs.writer(csvf)
(iii) Choose the correct option for Statement 3 to write the names of the column headings in the CSV
file, BOOKS.CSV.
(a) cw.writerow(‘Title’,‘Author’,‘Price’) (b) cw.writerow([‘Title’,‘Author’,‘Price’])
(c) cw.writerows(‘Title’,‘Author’,‘Price’) (d) cw.writerows([‘Title’,‘Author’,‘Price’])
(iv) Which statement will be used to read a csv file in Statement 4?
(a) cs.read(csvf) (b) csv.reader(csvf)
(c) csvf.read() (d) csvf.reader(cs)
(v) Fill in the appropriate statement to check the field Title starting with ‘R’ for Statement 5 in the
above program.
(a) r[0][0]==‘R’ (b) r[1][0]==‘R’ (c) r[0][1]==‘R’ (d) r[1][1]==‘R’
CBSE QUESTION BANK

7. Priyank is a software developer with a reputed firm. He has been given the task to computerise
the operations for which he is developing a form which will accept customer data as follows:
The DATA TO BE ENTERED IS :
Name
Age
Items bought (all the items that the customer bought)
Bill amount
(i) Choose the most appropriate data type to store the above information in the given sequence.
(a) string, tuple, float, integer (b) string, integer, dictionary, float
(c) string, integer, integer, float (d) string, integer, list, float
24 CBSE Sample Paper Computer Science Class XII (Term I)

(ii) Now the data of each customer needs to be organised such that the customer can be identified by
name followed by the age, item list and bill amount. Choose the appropriate data type that will
help Priyank accomplish this task.
(a) List (b) Dictionary
(c) Nested Dictionary (d) Tuple
(iii) Which of the following is the correct way of storing information of customers named ‘Paritosh’
and ‘Bhavesh’ with respect to the option chosen above?
(a) customers= {‘Paritosh’:24,[‘Printed Paper’, ‘ Penstand’], 3409, ‘Bhavesh’: 45,[‘A4 Rim’,’Printer
Cartridge’, ‘Pen Carton’, ‘Gift Wrap’], 8099.99 }
(b) customers={‘Paritosh’:[24,[‘Printed Paper’, ‘ Penstand’], 3409], ‘Bhavesh’: [45,[‘A4 Rim’,’Printer
Cartridge’, ‘Pen Carton’, ‘Gift Wrap’], 8099.99] }
(c) customers= [‘Paritosh’:24,‘Printed Paper’, ‘ Penstand’, 3409, ‘Bhavesh’: 45,‘A4 Rim’,’Printer
Cartridge’, ‘Pen Carton’, ‘Gift Wrap’, 8099.99 ]
(d) customers=(‘Paritosh’:24,[‘Printed Paper’, ‘ Penstand’], 3409, ‘Bhavesh’: 45,[‘A4 Rim’,’Printer
Cartridge’, ‘Pen Carton’, ‘Gift Wrap’], 8099.99 )
(iv) In order to calculate the total bill amount for 15 customers, Priyank
Statement 1 must use a variable of the type float to store the sum.
Statement 2 may use a loop to iterate over the values.
(a) Both statements are correct.
(b) Statement 1 is correct, but statement 2 is not.
(c) Both statements are incorrect.
(d) Statement 1 is incorrect but statement 2 is correct.

8. Your teacher has given you a method/function FilterWords() in Python which read lines from a
text file NewsLetter.TXT and display those words, which are lesser than 4 characters. Your
teachers intentionally kept few blanks in between the code and asked you to fill the blanks, so
that the code will run to find desired result. Do the needful with the following Python code.
def FilterWords():
c=0
file=open(‘NewsLetter.TXT’, ‘_____’) #Statement 1
line = file._____ #Statement 2
word = _____ #Statement 3
for c in word:
if _____: #Statement 4
print(c)
______ #Statement 5
FilterWords()
(i) Write mode of opening the file in Statement 1?
(a) a (b) ab
(c) w (d) r
CBSE QUESTION BANK

(ii) Fill in the blank in Statement 2 to read the data from the file.
(a) File.Read() (b) file.read()
(c) read.lines( ) (d) readlines( )
(iii) Fill in the blank in Statement 3 to read data word by word.
(a) Line.Split() (b) Line.split()
(c) line.split() (d) split.word()
(iv) Fill in the blank in Statement 4, which display the word having lesser than 4 characters.
(a) len(c) ==4 (b) len(c)<4
(c) len ( )= =3 (d) len ( )==4
(v) Fill in the blank in Statement 5 to close the file.
(a) file.close() (b) File.Close()
(c) Close() (d) end()
CBSE Sample Paper Computer Science Class XII (Term I) 25

Answers
1. (i) c (ii) b (iii) c (iv) d (v) c 2. (i) a (ii) c (iii) a (iv) a (v) d 3. (i) b (ii) d (iii) d (iv) c (v) d
4. (i) b (ii) d (iii) d (iv) b (v) c 5. (i) c (ii) c (iii) c (iv) d (v) c 6. (i) d (ii) b (iii) b (iv) b (v) a
7. (i) d (ii) c (iii) b (iv) a 8. (i) d (ii) b (iii) c (iv) b (v) a

SOLUTIONS
1. (i) csv is the correct code to fill up the blank is (ii) When location = “Surat”, pay = 50000
Statement 1, which is to be imported. entered by user then statement 6 will be
(ii) This code opens a file student.csv in write execute.
mode because append() method is using. (iii) When location = “Any Other City”, pay =1
So, correct missing code is entered by user then statement 6 will be
“Student.csv”, “w” execute because it does not satisfied any
(iii) writer(fh) should be used in blank space in given condition.
Statement 3. csv. writer is used to insert (iv) When location = “Delhi”, pay = 50000
data to the CSV file. entered by user then statement 4 will be
(iv) Suitable code for blank space in Statement execute.
4 is roll_no, name, class, section. (v) When location = “Lucknow”, pay =65000
(v) writerows() should be used in blank space entered by user then statement 5 will be
in Statement 5. execute.
writerows() function writes each sequence 4. (i) To update the element of dictionary which
in a list as a comma separated line of items is already exist, following syntax is used
in the file. dictionary name [key] = value
2. (i) To open the file binary, open() function is In question, to change the value of key 3
used. Ramesh have to give key instead of value.
Correct answer is So, the correct code is
F=open(“STUDENT.DAT”, ‘wb’), if file Book [3] = ‘Crime Thriller’
name is “STUDENT.DAT”.
(ii) To merge two dictionaries, following
(ii) To write the list L into file, pickle.dump syntax is used
(L,F) is used. For using dump() method,
dictionary2. update (dictionary1)
you first have to import the pickle module.
So, correct code to merge dictionaries
(iii) The correct statement used in marked as #3
Book and Library are
is R=pickle.load(F) because load()
method is used to load data from a binary Library. update (Book)
file. (iii) list () is used to convert the sequence types
(iv) The correct statement regarding the file into lists.
access modes is r+ opens a file for the both (iv) in operator considers only keys of
dictionary. If we want to check the
CBSE QUESTION BANK

reading and writing. File object points to

its beginning. existance of values of dictionary, we must
(v) seek() method moves the current file use dictionary Name. values () with in
position to a given specified position.This operator.
method does not return any value. (v) In Code 1,
3. (i) When user enters input as location = Content of dictionary Book is moving to
Chennai Library. pop () method is used to delete
key and respective value from dictionary.
and pay = 50000, then location ==
“Chennai” condition will be true. After that, So, key 2 and its value Mystery has
pay < 100000 : removed from the dictionary.
will be check it also true, so print (“No Because content is moving so dictionaries
way”) statement 2 will be execute. Library and Book both will have same
content.
26 CBSE Sample Paper Computer Science Class XII (Term I)

In Code 2, 7. (i) Data type for

Content of dictionary Book is copying to Name - string (A sequence of characters)
Library. So, content of Book will remain Age - Integer (Number without decimal)
same after removing the key: value pair Items - list (ordered sequence used to store
from dictionary Library. multiple data at the same time)
5. (i) Arun should open the file in rb mode in Bill amount - float (number with decimals)
Statement 1. This mode opens a file for (ii) Nested dictionary means putting a dictonary
reading only in binary format. inside another dictionary. Nesting is of great
(ii) try is used at blank space in line marked use as kind of information, we can model in
as Statement 2. programs expanded greatly.
(iii) load (f) is used at blank space in In given condition, we can use dictionary as
Statement 3. This method is used to load dic = {Name1 : { ‘Age’ : value, ‘item
data from a binary file. list’: value, ‘bill amount’ : value},
(iv) rec[0]==1 condition will be suitable code Name2: {‘Age’ : value, ‘item list’ :
for blank space in line marked as value, ‘bill amount’ : values},
Statement 4. :.
(v) Opened file is closed by calling the
close() method of its file objects. }
So, code is f.close() where f is file object. (iii) Correct code to store information of
customers with their respective values
(vi) rec is a variable which will store the
value of pickle.load (f). Customers = {‘Paritosh’ : [24, [‘Printed
Paper’, ‘Penstand’], 3409 ]},
6. (i) Mode ‘a’ opens a file for appending. The
‘Bhavesh’ : [45, [‘A4 Rim’, ‘Printer catridge’,
file pointer is placed at the end of the file,
‘Pen carton’, ‘Gift Wrap’], 8099.99]
if the file exists. If the file does not exist,
it creates a new file for writing. (iv) To calculate the total bill amount for 15
customers, Priyank can use variable of type
(ii) csv. writer is used to insert data to the
float which store the sum of values of
CSV file. This class returns a writer object
amount at same time.
which is responsible for converting the
user’s data into a delimited string. If Priyank uses the loop to iterate the values,
variable of type float would be use to add
Syntax csv.writer (CSVfile) the bill amount.
In statement 2, missing code is So, both statements 1 and 2 are correct.
csv. writer (csvf)
8. (i) r mode is used to open the file
where, csvf is CSV file. ‘NewsLetter.TXT’. It opens a file in reading
(iii) Correct code for Statement 3 is mode.
cw. writerow ([ ‘Title’, ‘Author’, ‘Price’]) (ii) file.read( ) is used to fill the blank Statement
where, Title, Author and Price are the 2 as this method returns a string containing
columns. writerow () method is used to all characters in a file.
write single row at a time. (iii) line. split( ) method is used to fill the blank
(iv) To read a CSV file, reader () method is in Statement 3 to read data word-by-word.
used. In Statement 4, to read csvf file, the (iv) len(c)<4 is used to fill the blank in Statement
CBSE QUESTION BANK

correct code is csv. reader (csvf). 4, which display the word having lesser than
(v) Title is the first column of CSV file, so its 4 characters.
index would be r [0] [0]. (v) file.close() is used to close the file. It is
Condition to check the field Title starting important to close the files as soon as you
with ‘R’ will be r [0] [0] = ‘R’. have finished your work with file.