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CS - Classes

Question 1

1 / 1 point

What is Instantiation in terms of OOP terminology?

Question options:

	Deleting an instance of class
	Modifying an instance of class
	Copying an instance of class
	Creating an instance of class

Question 2

1 / 1 point

A class can be used to group related variables together.

Question options:

	True
	False

Question 3

1 / 1 point

_____ is used to create an object?

Question options:

	class
	constructor
	User-defined functions
	In-built functions

Question 4

2 / 2 points

Find the correct matching explanation for each term

4	A method parameter that refers to the class instance.
2	A constructor method that initializes a class instance.
3	A group of related variables and functions.
1	A name following a "." symbol.
5	An instantiation of a class.

1.	attribute
2.	init
3.	class
4.	self
5.	instance

Question 5

2 / 2 points

Find the correct matching explanation for each class or object term

3	A variable shared with all instances of a class.
2	A variable that exists in a single instance.
4	A factory for creating new class instances.
5	Represents a single instance of a class.
1	Functions that are also class attributes.

1.	Instance methods
2.	Instance attribute
3.	Class attribute
4.	Class object
5.	Instance object

Question 6

1 / 1 point

What will be the output of the following Python code?

class test:
def init(self, a="Hello World"):
self.a = a

def display(self):
print(self.a)

obj=test()
obj.display()

Question options:

	The program has an error because constructor can't have default arguments
	The program has an error display function doesn't have parameters
	Nothing is displayed
	"Hello World" is displayed

Question 7

1 / 1 point

What will be the output of the following Python code?

class test:
def init( self, a ):
self.a = a

def display(self):
print(self.a)

obj=test()
obj.display()

Question options:

	Runs normally, doesn't display anything
	Displays 0, which is the automatic default value
	Error as one argument is required while creating the object
	Error as display function requires additional argument

Hide question 7 feedback

Feedback

The init special method has another argument a other than self, during object creation, one argument is required.

For example: obj=test("Hello World")

Question 8

1 / 1 point

What will be the output of the following Python code?

class test:

def init(self):

self.variable = 'Old'

self.Change(self.variable)

def Change(self, var):

var = 'New'

obj=test()

print(obj.variable)

Question options:

	Error because function change can't be called in the init function
	'New' is printed
	'Old' is printed
	Nothing is printed

Question 9

0 / 1 point

What will be the output of the following Python code?

class fruits:

def init(self, price):

self.price = price

obj=fruits(50)

obj.quantity=10

obj.bags=2

print( obj.quantity + len( obj.__dict__ ) )

Question options:

	12
	52
	13
	60

Question 10

1 / 1 point

What will be the output of the following Python code?

class Demo:

def init(self):

pass

def test(self):

print(__name__)

obj = Demo()

obj.test( )

Question options:

	Exception is thrown
	Demo
	name
	main

Question 11

1 / 1 point

What will be the output of the following Python code?

def add(c,k):

c.test=c.test+1

k=k+1

class A:

def init(self):

self.test = 0

def main():

Count=A()

k=0

for i in range(0,25):

add( Count, k)

print("Count.test=", Count.test)

print("k =", k)

main( )

Question options:

	Error happened in the above code.
	Count.test=25 k=25
	Count.test=25 k=0
	Count.test=0 k=0

Hide question 11 feedback

Feedback

test is a member of the class while k isn't. Hence test keeps getting incremented 25 time while k remains 0.

Question 12

1 / 1 point

To fix the error in the following Python code, which answer is correct?

class Person:

def init(self, the_last, the_first):

last = the_last

first = the_first

def str(self):

return( f"{last} {first} " )

p1 = Person( )

print( p1 )

Question options:

	class Person: def init(self, last, first): last = last first = first def str(self): return( f"{last} {first} " ) p1 = Person( ) print( p1 )
	class Person: def init(self, the_last, the_first): self.last = the_last self.first = the_first def str(self): return(f"{self.last} {self.first} " ) p1 = Person( ) print(p1)
	class Person: def init(self, the_last, the_first): self.last = the_last self.first = the_first def str(self): return(f"{the_last} { the_first} " ) p1 = Person("AB","CD") print(p1)
	class Person: def init(self, the_last, the_first): self.last = the_last self.first = the_first def str(self): return(f"{self.last} {self.first} " ) p1 = Person("AB","CD") print(p1)

Question 13

1 / 1 point

Which code can output "we will go to mountain" ?

Question options:

	class Foo: a = "mountain" def init(self, a): self.a = a def someday(self): return "we will go to " + a f1 = Foo("Hi, Jack") print(f1.someday())
	class Foo: a = "mountain" def init(self, a): self.a = a def someday(self): return "we will go to " + self.a f1 = Foo("Hi, Jack") print(f1.someday())
	class Foo: a = "mountain" def init(self, a): self.a = a def someday(self): return "we will go to " + Foo.a f1 = Foo("Hi, Jack") print(f1.someday())
	class Foo: a = "mountain" def init(self, a): self.a = a def someday(self): return "we will go to " + self.a f1 = Foo( ) print(f1.someday())