MCQs Relationship with classes Advanced Python Programming

MCQs Relationship with classes

1. Do we’ve to use list() to perform one-many operation?

• FALSE
• TRUE

Ans: True

2. How can you perform many to many relationship?

• By using dictionary in each class
• By using list in each class
• By using tuple in each class
• By using any of the above

Ans: By using any of the above

3.What  is  the  output  of  the  following  code  snippet.

class A:
    def __init__(self):
        self.calcI(30)
        print("i  from  A  is", self.i)

    def calcI(self, i):
        self.i = 2 * i

class B(A):
    def __init__(self):
        super().__init__()

    def calcI(self, i):
        self.i = 3 * i
        
b = B()

• i from A is 90
• i from A is 60
• i from A is 0
• i from A is 30

Ans : i from A is 90

4. Which of the following defines unidirectional relationship

• By Using any object we can access other class object.
• None of the above
• By creating a list of objects of other class inside each class
• By using specific object only then you can access the other class object

Ans : By using specific object only then you can access the other class object

5.What will be the output?

class Person:

    def __init__(self,a,b):

        self.name=a

        self.o=b

    def display(self):

        print”Name:”,self.name

        self.o.display()

class Company:

    def __init__(self,c):

        self.company=c

    def display(self):

        print”Company:”,self.company
 

c=Company(“Amphisoft”)
p=Person(“Jaya”,c)
p.display()

Name: Jaya
Company: Amphisoft

Name: Jaya

Company: Amphisoft

Name: Amphisoft
Company: Jaya

Ans : Name: Jaya
Company: Amphisoft

6. What will be the output? 

class Person:

    def __init__(self,a,b):

        self.name=a

        self.o=b

    def display(self):

        print”Name:”,self.name

        self.o.display()

class Company:

    def __init__(self,c):

        self.company=c

    def display(self):

        print”Company:”,self.company

        

c=Company(“Amphisoft”) 

p=Person(“Jaya”,c) 

• Name: Jaya Company: Amphisoft
• Name: Jaya
• Company: Amphisoft
• Complie time error

Ans : Company: Amphisoft

7.What is the output of the following code

class Person:
    def __init__(self,a,b=None):
        self.name=a
        self.o=b
    def display(self):
        print("Name:",self.name)
        print("Company:" , self.o.company)
class Company:
    def __init__(self,c,d=None):
        self.company=c
        self.o=d
    def display(self):
        print("Name:" , self.o.name)
        print("Company:",self.company)

print("Menu\n1.Person\n2.Company")
n=int(input("Enter you choice\n"))
if n==1:
    c=Company("Amphisoft")
    p=Person("Jaya",c)
    p.display()
elif n==2:
    p=Person("Jaya")
    c=Company("Amphisoft",p)
    c.display()

• It depends upon class
• If n=1 then Name: Jaya is printed
• Name: Jaya Company: Amphisoft
• If n=2 then Company: Amphisoft is printed

Ans: Name: Jaya Company: Amphisoft

8. Which  of  the  following  statements  are  correct?
A.  A  reference  variable  is  an  object.
B.  A  reference  variable  refers  to  an  object.
C.  An  object  may  contain  other  objects.
D.  An  object  can  contain  the  references  to  other  objects.

A and B

B and D

B and C

C and D

Ans : B and D

9.What  is  the  output  of  the  following  code  snippet.

class Person:
    def __init__(self , id):
        self.id = id

sam = Person(100)
sam.__dict__['age'] = 49
print(sam.age + len(sam.__dict__))

50

49

51

52

Ans : 51

10. Which  of  the  following  statements  are  correct  about  the  given  code  snippet?

class A:
    def __init__(self, i = 0):
        self.i = i

class B(A):
    def __init__(self, j = 0):
        self.j = j

def main():
    b = B()
    print(b.i)
    print(b.j)
    
main()

• Class B inherits A, but the data field “i” in A is not inherited.
• The data field “j” cannot be accessed by object b.
• Class B inherits A, thus automatically inherits all data fields in A.
• When you create an object of B, you have to pass an argument such as B(5).

Ans : Class B inherits A, but the data field “i” in A is not inherited.

11. What does it signify?

class Person:
    def __init__(self,a,b = None):
        self.name=a
        self.listOfcompany=[]
        self.listOfcompany.append(b)
    def display(self):
        print("Name:",self.name)
        self.listOfcompany[0].display()
class Company:
    def __init__(self,c):
        self.company=c
    def display(self):
        print("Company:",self.company)
c=Company("Amphisoft")
p=Person("Jaya",c)
p.display()

• one-many
• one-one
• uni directional
• Many-Many

Ans : uni directional

12. What does it signify?

class Person:
    def __init__(self,a,b):
        self.name=a
        self.listOfcompany=b 
    def display(self):
        print("Name:",self.name)
        for i in self.listOfcompany:
            i.display()
class Company:
    def __init__(self,c,d = None):
        self.company=c
        self.o=d
    def display(self):
        print("Company:",self.company)
l=[]
for i in range(n):
    c=Company(input("Enter the company"))
    l.append(c)
    p=Person("Jaya",l)
    p.display()

• one-many
• one-one
• uni directional
• Many-Many

Ans : one-many

13. What does it signify?

class City:
    def __init__(self,name,state) :
        self.__name = name
        self.__state = state
    def __str__(self):
        s=str(self.__state).split()
        if s[1]=="has":
            return self.__name+" is in state "+str(s[0])
        else:
            return self.__name+" is in state "+str(s[0])+" "+str(s[1])
class State:
    def __init__(self,name,city_list) :
        self.__name = name
        self.__city_list = city_list
    @property
    def city_list(self) :
        return self.__city_list
    @city_list.setter
    def city_list(self,city_list) :
        self.__city_list=val
    @property
    def name(self) :
        return self.__name
    def __str__(self) :
        return self.__name+" has "+str(len(self.__city_list))+" cities"

state_list = []
state_list.append(State("Tamilnadu",[]))
state_list.append(State("Andhra",[]))
state_list.append(State("Karnataka",[]))
state_list.append(State("Kerala",[]))

print("Enter City Details")
city_created_list = []
choice = "Yes"
while choice == "Yes" :
    city_name = input("Enter city name\n")
    state_name = input("Enter state name\n")
    state_found_flag = 0
    for state in state_list :
        if state_name == state.name :
            city = City(city_name, state)
            state.city_list.append(city)
            city_created_list.append(city)
            state_found_flag = 1
    if state_found_flag == 0 :
        state = State(state_name,[])
        state_list.append(state)
        city = City(city_name, state)
        city_created_list.append(city)
        state.city_list.append(city)
    choice = input("Do you want to add another city? Type Yes / No\n")

print("\nCity Details\n")
for city in city_created_list :
    print(city)

print("\nState Details\n")    
for state in state_list :
    print(state)

 

• uni directional
• one-many
• one-one
• Many-Many

Ans: one many

14. If n and m value is 10,What will be the output?

class Person:
    def __init__(self,a,b = None):
        self.name=a
        self.listOfcompany=[]
    def companyList(self,l):
        for i in l:
            self.listOfcompany.append(i)
    def display(self):
        print("Name:",self.name)
        for i in self.listOfcompany :
            print(i.company)
class Company:
    def __init__(self,c,d = None):
        self.company=c
        self.listofPerson=[]
    def personList(self,l):
        for i in l:
            self.listofPerson.append(i)
    def display(self):
        print("Company:",self.company)
        for i in self.listofPerson:
            i.display()
l=[]
l1=[]
print("Enter company Name")
for i in range(10):
    c=Company(input())
    l.append(c)

print("Enter Person name")
for i in range(10):
    p=Person(input())
    l1.append(p)
c.personList(l1)
p.companyList(l)
p.display()

• It will print 10 person details with the corresponding company details
• It will print the person name and 10 company details
• it will chech weither the person is working in any one of the company specified in the list
• it will print 10 person name along with 10 company names

Ans : It will print the person name and 10 company details

Statement:

Mr. Vishwas is a big lover of cars. 

He has a dream to own a car of his reqiurements. 

His requirements include few car and company related and few engine related. 

Write a Python code to take the reqiurements of Vishwas and display the same. 

Create following classes with the following attributes and methods.

Develop the relationship between the classes. 
Initialize the constructor using __init__ in each class. 

Class Name: Engine    
Data type – Attribute :  String – transmission , String – type  
Method Name: start() and display()  

Class Name: Cars    
Data type – Attribute : String – companyname  , String – colour , Engine – eng  
Method Name: run() and display() 

Class Name: Owner    
Data type – Attribute :  String – name , Cars – car  
Method Name: display() 

Answer the below questions by considering the above scenario

15. What is composition? 

• Implies that the two objects are quite strongly linked
• One object can be thought of as belonging exclusively to the other object.
• Both a and b
• None of the mentioned.

Ans: Both a and b

16. Composition represents

• “Has a” relationship
• “Is a” relationship
• “Uses a” relationship
• None of the mentioned

Ans: “Has a” relationship

17. Which of the following combination of classes is an example for composition?

• Engine-Owner
• Owner- Cars
• Cars-Engine
• None of the mentioned

Ans: Cars-Engine

18. Aggregation represents

• “Has a” relationship
• “Is a” relationship
• “Uses a” relationship
• None of the mentioned

Ans: “Uses a” relationship

19. Which of the following combination of classes is an example for aggregation?

• Engine-Owner
• Owner- Cars
• Cars-Engine
• None of the mentioned

Ans: Owner- Cars

20. Where does the object of Engine class created? 

class Engine:
def __init__(self,k,l):
self.transmission=k
self.type1=l

 def start(self):
print"Engine working!!!"
 

class Cars:
def __init__(self,c,d,a,b):
self.companyName=c
self.type=d
self.eng=Engine(a,b)

 def run(self):
self.eng.start()
print"Car is running!!!"

c= Cars('BMW','automatic gear','6 Transmission','Petrol')
c.run()

• in Engine class
• in Cars class
• in Main method
• None of the mentioned

Ans: in Cars class

21. What is the output of above code?

class Engine:
def __init__(self,k,l):
self.transmission=k
self.type1=l

 def start(self):
print"Engine working!!!"
 

class Cars:
def __init__(self,c,d,a,b):
self.companyName=c
self.type=d
self.eng=Engine(a,b)

 def run(self):
self.eng.start()
print"Car is running!!!"

c= Cars('BMW','automatic gear','6 Transmission','Petrol')
c.run()

• Engine working!!! Car is running!!!
• Car is running!!! Engine working!!!
• Car is running!!!
• Engine working!!!

Ans: Engine working!!! Car is running!!!

22. What is the type of relationship that exist between Owner class and Cars class?

• Composition
• Aggregation
• Both
• None of the mentioned

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