State True or False – “Variable declaration is implicit in Python.”

Solution

Which of the following is an invalid datatype in Python?
(a) Set
(b) None
(c)Integer
(d)Real

Solution

Given the following dictionaries

dict_exam={"Exam":"AISSCE", "Year":2023}
dict_result={"Total":500, "Pass_Marks":165}

Which statement will merge the contents of both dictionaries?
a. dict_exam.update(dict_result)
b. dict_exam + dict_result
c. dict_exam.add(dict_result)
d. dict_exam.merge(dict_result)

Solution

Consider the given expression:

not True and False or True

Which of the following will be correct output if the given expression is evaluated?
(a) True
(b) False
(c) NONE
(d) NULL

Solution

Select the correct output of the code:

a = "Year 2022 at All the best"
a = a.split('2')
b = a[0] + ". " + a[1] + ". " + a[3]
print (b)
(a) Year . 0. at All the best
(b) Year 0. at All the best
(c) Year . 022. at All the best
(d) Year . 0. at all the best

Solution

Which of the following mode in file opening statement results or generates an error if the file does not exist?
(a) a+
(b) r+
(c) w+
(d) None of the above

Solution

Fill in the blank:
______ command is used to remove primary key from a table in SQL.
(a) update (b)remove (c) alter (d)drop

Solution

Which of the following commands will delete the table from MYSQL database?
(a) DELETE TABLE
(b) DROP TABLE
(c) REMOVE TABLE
(d) ALTER TABLE

Solution

Which of the following statement(s) would give an error after executing the following code?
S="Welcome to class XII" # Statement 1
print(S) # Statement 2
S="Thank you" # Statement 3
S[0]= '@' # Statement 4
S=S+"Thank you" # Statement 5

(a) Statement 3
(b) Statement 4
(c) Statement 5
(d) Statement 4 and 5

Solution

Fill in the blank:
_________ is a non-key attribute, whose values are derived from the primary key of some other table.
(a) Primary Key
(b) Foreign Key
(c) Candidate Key
(d) Alternate Key

Solution

The correct syntax of seek() is:
(a) file_object.seek(offset [, reference_point])
(b) seek(offset [, reference_point])
(c) seek(offset, file_object)
(d) seek.file_object(offset)

Solution

Fill in the blank:
The SELECT statement when combined with __________ clause, returns records without repetition.
(a) DESCRIBE
(b) UNIQUE
(c) DISTINCT
(d) NULL

Solution

Fill in the blank:
______is a communication methodology designed to deliver both voice and multimedia communications over Internet protocol.
(a) VoIP (b) SMTP (c) PPP (d)HTTP

Solution

What will the following expression be evaluated to in Python?

print(15.0 / 4 + (8 + 3.0))
(a) 14.75 (b)14.0 (c) 15 (d) 15.5

Solution

Which function is used to display the total number of records from a table in a database?
(a) sum(*)
(b) total(*)
(c) count(*)
(d) return(*)

Solution

To establish a connection between Python and SQL database, connect() is used. Which of the following arguments may not necessarily be given while calling connect() ?
(a) host
(b) database
(c) user
(d) password

Solution

Q17 and 18 are ASSERTION AND REASONING based questions. Mark the correct choice as
(a) Both A and R are true and R is the correct explanation for A
(b) Both A and R are true and R is not the correct explanation for A
(c) A is True but R is False
(d) A is false but R is True

Assertion (A):- If the arguments in a function call statement match the number and order of arguments as defined in the function definition, such arguments are called positional arguments.
Reasoning (R):- During a function call, the argument list first contains default argument(s) followed by positional argument(s).

Solution

Assertion (A): CSV (Comma Separated Values) is a file format for data storage which looks like a text file.
Reason (R): The information is organized with one record on each line and each field is separated by comma.

Solution

Rao has written a code to input a number and check whether it is prime or not. His code is having errors. Rewrite the correct code and underline the corrections made.

def prime():
    n=int(input("Enter number to check :: ")
    for i in range (2, n//2):
    if n%i=0:
        print("Number is not prime \n")
    break
    else:
        print("Number is prime \n’)
                

Solution

Write two points of difference between Circuit Switching and Packet Switching.

Solution

Write two points of difference between XML and HTML.

Solution

a. Given is a Python string declaration:
myexam="@@CBSE Examination 2022@@"
Write the output of: print(myexam[::-2])

Solution

b. Write the output of the code given below:
my_dict = {"name": "Aman", "age": 26}
my_dict['age'] = 27
my_dict['address'] = "Delhi"
print(my_dict.items())

Solution

Explain the use of ‘Foreign Key’ in a Relational Database Management System. Give example to support your answer.

Solution

A foreign key is used to set or represent a relationship between two relations ( or tables) in a database. Its value is derived from the primary key attribute of another relation.
For example:
In the tables TRAINER and COURSE given below, TID is primary key in TRAINER table but foreign key in COURSE table.

Trainer

TID	TNAME	CITY	HIREDATE	SALARY
101	Ritu	Nagpur	1998-10-15	56700
102	Navin	Goa	1994-12-24	80000
103	Murugan	Chandigarh	2001-12-21	82000
104	Jyothi	Guwahati	2002-12-25	68000
105	Chanu	Mumbai	1996-01-12	95000
106	Arbaz	Delhi	2001-12-12	69000

COURSE

(a) Write the full forms of the following:
(i) SMTP (ii) PPP

Solution

(b) What is the use of TELNET?
(i) SMTP (ii) PPP

Solution

Predict the output of the Python code given below:

def Diff(N1,N2):
    if N1>N2:
    return N1-N2
    else:
    return N2-N1

NUM= [10,23,14,54,32]
for CNT in range (4,0,-1):
    A=NUM[CNT]
    B=NUM[CNT-1]
    print(Diff(A,B),'#', end=' ')
                

Solution

OR

Predict the output of the Python code given below:

tuple1 = (11, 22, 33, 44, 55 ,66)
list1 =list(tuple1)
new_list = []
for i in list1:
    if i%2==0:
        new_list.append(i)
new_tuple = tuple(new_list)
print(new_tuple)
                    
                

Solution

Differentiate between COUNT() and COUNT(*) functions in SQL with appropriate example.

Solution

Ans: COUNT(*) returns the count of all rows in the table, whereas COUNT () is used with Column_Name passed as argument and counts the number of non-NULL values in a column that is given as argument.
Example: Table : EMPL

e.g. SELECT COUNT(*) FROM EMPL;
Output

e.g.2 SELECT COUNT(JOB) FROM EMPL;
Output

Since JOB has 2 NULL values

(a) Consider the following tables – Bank_Account and Branch:

What will be the output of the following statement?
SELECT * FROM Bank_Account NATURAL JOIN Branch;

Solution

Ans:

OR

(b) Write the output of the queries (i) to (iv) based on the table, TECH_COURSE given below:

(i) SELECT DISTINCT TID FROM TECH_COURSE;
(ii) SELECT TID, COUNT(*), MIN(FEES) FROM TECH_COURSE GROUP BY TID HAVING COUNT(TID)>1;
(iii) SELECT CNAME FROM TECH_COURSE WHERE FEES>15000 ORDER BY CNAME;
(iv) SELECT AVG(FEES) FROM TECH_COURSE WHERE FEES BETWEEN 15000 AND 17000;

Solution

Ans: (i)

Ans. (ii)

Ans. (iii)

Ans:(iv)
15500.00

Write a method COUNTLINES() in Python to read lines from text file ‘TESTFILE.TXT’ and display the lines which are not starting with any vowel.
Example:
If the file content is as follows:
An apple a day keeps the doctor away.
We all pray for everyone’s safety.
A marked difference will come in our country.
The COUNTLINES() function should display the output as:
The number of lines not starting with any vowel - 1

Solution

Ans:

def COUNTLINES() :
    file = open ('TESTFILE.TXT', 'r')
    lines = file.readlines()
    count=0
    for w in lines :
        if (w[0]).lower() not in 'aeoiu'
             count = count + 1
    print ("The number of lines not starting with any 
vowel: ", count)
    file.close()
             

OR

Write a function ETCount() in Python, which should read each character of a text file “TESTFILE.TXT” and then count and display the count of occurrence of alphabets E and T individually (including small cases e and t too).
Example:
If the file content is as follows:
Today is a pleasant day.
It might rain today.
It is mentioned on weather sites
The ETCount() function should display the output as:
The number of E or e: 6
The number of T or t : 9

Solution

Ans:

def ETCount() :
    file = open ('TESTFILE.TXT', 'r')
    lines = file.readlines()
    countE=0
    countT=0
    for w in lines :
        for ch in w:
            if ch in 'Ee':
                countE = countE + 1
            if ch in 'Tt':
                countT=countT + 1
print ("The number of E or e : ", countE)
print ("The number of T or t : ", countT)
file.close()
                                 

(a) Write the outputs of the SQL queries (i) to (iii) based on the relations Teacher and Placement given below:

(i) SELECT Department, avg(salary) FROM Teacher GROUP BY Department;
(ii) SELECT MAX(Date_of_Join),MIN(Date_of_Join) FROM Teacher;
(iii)SELECT Name, Salary, T.Department, Place FROM Teacher T, Placement P WHERE T.Department = P.Department AND Salary>20000;
(iv)SELECT Name, Place FROM Teacher T, Placement P WHERE Gender='F' and T.Department=P.Department;

Solution

Ans. (i)

Ans. (ii)

Ans. (iii)

Ans. (iv)

(b) Write the command to view all tables in a database.

Solution

Write a function INDEX_LIST(L), where L is the list of elements passed as argument to the function. The function returns another list named indexList that stores the indices of all Non-Zero Elements of L.
For example:
If L contains [12,4,0,11,0,56]

The indexList will have - [0,1,3,5]

Solution

Ans:

def INDEX_LIST(L):
    indexList=[]
    for i in range(len(L)):
        if L[i]!=0:
            indexList.append(i)
    return indexList
             

A list contains following record of a customer:
[Customer_name, Phone_number, City]
Write the following user defined functions to perform given operations on the stack named status:
(i) Push_element() - To Push an object containing name and Phone number of customers who live in Goa to the stack
(ii) Pop_element() - To Pop the objects from the stack and display them. Also, display “Stack Empty” when there are no elements in the stack.
For example:
If the lists of customer details are:
[“Gurdas”, “99999999999”,”Goa”]
[“Julee”, “8888888888”,”Mumbai”]
[“Murugan”,”77777777777”,”Cochin”]
[“Ashmit”, “1010101010”,”Goa”]

The stack should contain
[“Ashmit”,”1010101010”]
[“Gurdas”,”9999999999”]

The output should be:
[“Ashmit”,”1010101010”]
[“Gurdas”,”9999999999”]
Stack Empty

Solution

Ans:

status=[]
def Push_element(cust):
    if cust[2]=="Goa":
         L1=[cust[0],cust[1]]
         status.append(L1)

def Pop_element ():
    num=len(status)
    while len(status)!=0:
        dele=status.pop()
        print(dele)
        num=num-1
    print("Stack Empty")
             

OR

Write a function in Python, Push(SItem) where , SItem is a dictionary containing the details of stationary items– {Sname:price}. The function should push the names of those items in the stack who have price greater than 75. Also display the count of elements pushed into the stack.
For example:
If the dictionary contains the following data:
Ditem={"Pen":106,"Pencil":59,
"Notebook":80,"Eraser":25}

The stack should contain
Notebook
Pen

The output should be:
The count of elements in the stack is 2

Solution

Ans:

stackItem=[]
def Push(SItem):
    count=0
    for k in SItem:
        if (SItem[k]>=75):
            stackItem.append(k)
            count=count+1
    print("The count of elements in the stack is : ",count)
             

MakeInIndia Corporation, an Uttarakhand based IT Training company, is planning to set up training centres in various cities in next 2 years. Their first campus is coming up in Kashipur district. At Kashipur campus, they are planning to have 3 different blocks for App development, Web designing and Movie Editing. Each block has number of computers, which are required to be connected in a network for communication, data and resource sharing. As a network consultant of this company, you have to suggest the best network related solutions for them for issues/problems raised in question nos. (i) to (v), keeping in mind the distances between various blocks/locations and other given parameters.

Distance between various blocks/locations:

Number of computers

(i) Suggest the most appropriate block/location to house the SERVER in the Kashipur campus (out of the 3 blocks) to get the best and effective connectivity. Justify your answer.
(ii) Suggest a device/software to be installed in the Kashipur Campus to take care of data security.
(iii) Suggest the best wired medium and draw the cable layout (Block to Block) to economically connect various blocks within the Kashipur Campus.
(iv) Suggest the placement of the following devices with appropriate reasons:
a. Switch / Hub
b. Repeater
(v) Suggest the protocol that shall be needed to provide Video Conferencing solution between Kashipur Campus and Mussoorie Campus.

Solution

Ans: (i)
Movie editing block is the most appropriate to house the server as it has the maximum number of computers.
Ans: (ii) Firewall
Ans: (iii) Ethernet Cable
Layout:

Ans: (iv) Switch/hub will be placed in all blocks to have connectivity within the block. Repeater is not required between the blocks as the distances are less than 100 mts.
Ans: (v) Protocol: VoIP

(a) Write the output of the code given below

p=5
def sum(q,r=2):
    global p
    p=r+q**2
    print(p, end= '#')

a=10
b=5
sum(a,b)
sum(r=5,q=1)
                

Solution

(b) The code given below inserts the following record in the table Student:
RollNo – integer
Name – string
Clas – integer
Marks – integer
Note the following to establish connectivity between Python and MYSQL:
1.Username is root
2.Password is tiger
3.The table exists in a MYSQL database named school.
4.The details (RollNo, Name, Clas and Marks) are to be accepted from the user.
Write the following missing statements to complete the code:
Statement 1 – to form the cursor object
Statement 2 – to execute the command that inserts the record in the table Student.
Statement 3- to add the record permanently in the database

import mysql.connector as mysql
def sql_data():
    con1=mysql.connect(host="localhost",user="root",
password="tiger", database="school")
    mycursor=_________________  #Statement 1
    rno=int(input("Enter Roll Number :: "))
    name=input("Enter name :: ")
    clas=int(input("Enter class :: "))
    marks=int(input("Enter Marks :: "))
    querry="insert into student
values({},'{}',{},{})".format(rno,name,clas,marks)
______________________          #Statement 2
______________________          # Statement 3
print("Data Added successfully")

Solution

OR

(a) Predict the output of the code given below:

s="welcome2cs"
n = len(s)
m=""
for i in range(0, n):
    if (s[i] >= 'a' and s[i] <= 'm'):
        m = m +s[i].upper()
    elif (s[i] >= 'n' and s[i] <= 'z'):
        m = m +s[i-1]
    elif (s[i].isupper()):
        m = m + s[i].lower()
    else:
        m = m +'&'
print(m)
            

Solution

(b) The code given below reads the following record from the table named student and displays only those records who have marks greater than 75:
RollNo – integer
Name – string
Clas – integer
Marks – integer

Note the following to establish connectivity between Python and MYSQL:
Username is root
Password is tiger
The table exists in a MYSQL database named school.
Write the following missing statements to complete the code:
Statement 1 – to form the cursor object
Statement 2 – to execute the query that extracts records of those students whose marks are greater than 75.
Statement 3- to read the complete result of the query (records whose marks are greater than 75) into the object named data, from the table student in the database.

import mysql.connector as mysql
def sql_data():

    con1=mysql.connect(host="localhost",user="root",passwo
    rd="tiger", database="school")
    mycursor=_______________ #Statement 1
    print("Students with marks greater than 75 are : ")
    _________________________ #Statement 2
    data=__________________ #Statement 3
    for i in data:
        print(i)
    print()
    

Solution

What is the advantage of using a csv file for permanent storage?
Write a Program in Python that defines and calls the following user defined functions:
a) ADD() – To accept and add data of an employee to a CSV file ‘record.csv’. Each record consists of a list with field elements as empid, name and mobile to store employee id, employee name and employee salary respectively.
b) COUNTR() – To count the number of records present in the CSV file named ‘record.csv’.

Solution

Program:

import csv
def ADD():
    fout=open("record.csv","a",newline="\n")
    wr=csv.writer(fout)
    empid=int(input("Enter Employee id :: "))
    name=input("Enter name :: ")
    mobile=int(input("Enter mobile number :: "))
    lst=[empid,name,mobile] ---------1/2 mark
    wr.writerow(lst) ---------1/2 mark
    fout.close()

def COUNTR():
    fin=open("record.csv","r",newline="\n")
    data=csv.reader(fin)
    d=list(data)
    print(len(d))
    fin.close()
ADD()
COUNTR()
             

OR

Give any one point of difference between a binary file and a csv file.
Write a Program in Python that defines and calls the following user defined functions:
a) add() – To accept and add data of an employee to a CSV file ‘furdata.csv’. Each record consists of a list with field elements as fid, fname and fprice to store furniture id, furniture name and furniture price respectively.
b) search()- To display the records of the furniture whose price is more than 10000.

Solution

Program:

import csv
    def add():
    fout=open("furdata.csv","a",newline='\n')
    wr=csv.writer(fout)
    fid=int(input("Enter Furniture Id :: "))
    fname=input("Enter Furniture name :: ")
    fprice=int(input("Enter price :: "))
    FD=[fid,fname,fprice]
    wr.writerow(FD)
    fout.close()

def search():
    fin=open("furdata.csv","r",newline='\n')
    data=csv.reader(fin)
    found=False
    print("The Details are")
    for i in data:
        if int(i[2])>10000:
            found=True
            print(i[0],i[1],i[2])
    if found==False:
        print("Record not found")
        fin.close()
add()
print("Now displaying")
search()
             

Navdeep creates a table RESULT with a set of records to maintain the marks secured by students in Sem 1, Sem2, Sem3 and their division. After creation of the table, he has entered data of 7 students in the table.
Based on the data given above answer the following questions:
i. Identify the most appropriate column, which can be considered as Primary key.
ii. If two columns are added and 2 rows are deleted from the table result, what will be the new degree and cardinality of the above table?
iii. Write the statements to:
a. Insert the following record into the table – Roll No- 108, NameAadit, Sem1- 470, Sem2-444, Sem3-475, Div – I.
b. Increase the SEM2 marks of the students by 3% whose name begins with ‘N’

OR

iii. Write the statements to:
a. Delete the record of students securing IV division.
b. Add a column REMARKS in the table with datatype as varchar with 50 characters

Solution

(b) The code given below inserts the following record in the table Student:
RollNo – integer
Name – string
Clas – integer
Marks – integer
Note the following to establish connectivity between Python and MYSQL:
1.Username is root
2.Password is tiger
3.The table exists in a MYSQL database named school.
4.The details (RollNo, Name, Clas and Marks) are to be accepted from the user.
Write the following missing statements to complete the code:
Statement 1 – to form the cursor object
Statement 2 – to execute the command that inserts the record in the table Student.
Statement 3- to add the record permanently in the database

import mysql.connector as mysql
def sql_data():
    con1=mysql.connect(host="localhost",user="root",
password="tiger", database="school")
    mycursor=_________________  #Statement 1
    rno=int(input("Enter Roll Number :: "))
    name=input("Enter name :: ")
    clas=int(input("Enter class :: "))
    marks=int(input("Enter Marks :: "))
    querry="insert into student
values({},'{}',{},{})".format(rno,name,clas,marks)
______________________          #Statement 2
______________________          # Statement 3
print("Data Added successfully")

Solution

OR

(a) Predict the output of the code given below:

s="welcome2cs"
n = len(s)
m=""
for i in range(0, n):
    if (s[i] >= 'a' and s[i] <= 'm'):
        m = m +s[i].upper()
    elif (s[i] >= 'n' and s[i] <= 'z'):
        m = m +s[i-1]
    elif (s[i].isupper()):
        m = m + s[i].lower()
    else:
        m = m +'&'
print(m)
            

Solution

(b) The code given below reads the following record from the table named student and displays only those records who have marks greater than 75:
RollNo – integer
Name – string
Clas – integer
Marks – integer

Note the following to establish connectivity between Python and MYSQL:
Username is root
Password is tiger
The table exists in a MYSQL database named school.
Write the following missing statements to complete the code:
Statement 1 – to form the cursor object
Statement 2 – to execute the query that extracts records of those students whose marks are greater than 75.
Statement 3- to read the complete result of the query (records whose marks are greater than 75) into the object named data, from the table student in the database.

import mysql.connector as mysql
def sql_data():

    con1=mysql.connect(host="localhost",user="root",passwo
    rd="tiger", database="school")
    mycursor=_______________ #Statement 1
    print("Students with marks greater than 75 are : ")
    _________________________ #Statement 2
    data=__________________ #Statement 3
    for i in data:
        print(i)
    print()
    

Solution

Aman is a Python programmer. He has written a code and created a binary file record.dat with employeeid, ename and salary. The file contains 10 records.
He now has to update a record based on the employee id entered by the user and update the salary. The updated record is then to be written in the file temp.dat. The records which are not to be updated also have to be written to the file temp.dat. If the employee id is not found, an appropriate message should to be displayed.
As a Python expert, help him to complete the following code based on the requirement given above:

import _______ #Statement 1
def update_data():
    rec={}
    fin=open("record.dat","rb")
    fout=open("_____________") #Statement 2
    found=False
    eid=int(input("Enter employee id to update their salary
    :: "))
    while True:
        try:
        rec=______________ #Statement 3
        if rec["Employee id"]==eid:
            found=True
            rec["Salary"]=int(input("Enter new salary ::
            "))
            pickle.____________ #Statement 4
        else:
            pickle.dump(rec,fout)
        except:
            break
    if found==True:
        print("The salary of employee id ",eid," has been
        updated.")
    else:
        print("No employee with such id is not found")
    fin.close()
    fout.close()


   
                

(i) Which module should be imported in the program? (Statement 1)
(ii)Write the correct statement required to open a temporary file named temp.dat for writing the updated data. (Statement 2)
(iii) Which statement should Aman fill in Statement 3 to read the data from the binary file, record.dat and in Statement 4 to write the updated data in the file, temp.dat?

Solution