OOPS Set 3

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Free Online Best OOPS MCQ Questions for improve your basic knowledge of C++. This OOPS Set 3 test that contains 25 Multiple Choice Questions with 4 options. You have to select the right answer to a question.

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Question 1

Which among the following is true?

A	The abstract functions must be only declared in derived classes
B	The abstract functions must not be defined in derived classes
C	The abstract functions must be defined in base and derived class
D	The abstract functions must be defined either in base or derived class

Question 2

What does a virtual function ensure for an object, among the following?

A	Correct method is called, regardless of the class defining it
B	Correct method is called, regardless of the object being called
C	Correct method is called, regardless of the type of reference used for function call
D	Correct method is called, regardless of the type of function being called by objects

Question 3

Why do we need to handle exceptions?

A	To prevent abnormal termination of program
B	To encourage exception prone program
C	To avoid syntax error
D	To save memory

Question 4

Which is the universal exception handler class?

A	Object
B	Math
C	Errors
D	Exceptions

Question 5

Which among the following is correct?

A	Abstract functions should not be defined in all the derived classes
B	Abstract functions should be defined only in one derived class
C	Abstract functions must be defined in base class
D	Abstract functions must be defined in all the derived classes

Question 6

Where is the memory allocated for the objects?

A	HDD
B	Cache
C	RAM
D	ROM

Question 7

If a file that needs to be opened is not found in the target location then _____________

A	Exception will be produced
B	Exceptions are not produced
C	Exception might get produced because of syntax
D	Exceptions are not produced because of logic

Question 8

Which among the following is true?

A	Inheritance must not be using when overriding is used
B	Overriding can be implemented without using inheritance
C	Inheritance must be done, to use overriding are overridden
D	Inheritance is mandatory only if more than one functions

Question 9

What does memory allocation for objects mean?

A	Actual creation and memory allocation for object members
B	Creation of member functions
C	Creation of data members for a class
D	Actual creation and data declaration for object members

Question 10

Which among the following best describes member function overriding?

A	Member functions having same name in base and derived classes
B	Member functions having same name in base class only
C	Member functions having same name in derived class only
D	Member functions having same name and different signature inside main function

Question 11

Virtual functions are mainly used to achieve _____________

A	Compile time polymorphism
B	Interpreter polymorphism
C	Runtime polymorphism
D	Functions code polymorphism

Question 12

When is the memory allocated for an object?

A	At declaration of object
B	At compile time
C	When object constructor is called
D	When object is initialized to another object

Question 13

How many types of member functions are possible in general?

A	2
B	3
C	4
D	5

Question 14

How are abstract functions different from the abstract functions?

A	Abstract must not be defined in base class whereas virtual function can be defined
B	Either of those must be defined in base class
C	Different according to definition
D	Abstract functions are faster

Question 15

Which is the correct condition for function overriding?

A	The declaration must not be same in base and derived class
B	The declaration must be exactly the same in base and derived class
C	The declaration should have at least 1 same argument in declaration of base and derived class
D	The declaration should have at least 1 different argument in declaration of base and derived class

Question 16

Which type of inheritance leads to diamond problem?

A	Single level
B	Multi-level
C	Multiple
D	Hierarchical

Question 17

What is an exception?

A	Problem arising during compile time
B	Problem arising during runtime
C	Problem in syntax
D	Problem in IDE

Question 18

Exactly same declaration in base and derived class includes______________

A	Only same name
B	Only same return type and name
C	Only same return type and argument list
D	All the same return type, name and parameter list

Question 19

Which is the correct syntax of inheritance?

A	class derived_classname : base_classname{ /define class body/ };
B	class base_classname : derived_classname{ /define class body/ };
C	class derived_classname : access base_classname{ /define class body/ };
D	class base_classname :access derived_classname{ /define class body/ };

Question 20

An exception may arise when _______________

A	Input is fixed
B	Input is some constant value of program
C	Input given is invalid
D	Input is valid

Question 21

Simple member functions are ______________________

A	Ones defined simply without any type
B	Ones defined with keyword simple
C	Ones that are implicitly provided
D	Ones which are defined in all the classes

Question 22

Which keyword is used to declare virtual functions?

A	virtual
B	virt
C	anonymous
D	virtually

Question 23

It is ____________________ to define the abstract functions.

A	Mandatory for all the classes in program
B	Necessary for all the base classes
C	Necessary for all the derived classes
D	Not mandatory for all the derived classes

Question 24

Which among the following best defines the abstract methods?

A	Functions declared and defined in base class
B	Functions only declared in base class
C	Function which may or may not be defined in base class
D	Function which must be declared in derived class

Question 25

Virtual function is ______ class function which expected to be redefined in ______ class, so that when reference is made to derived class object using pointer then we can call virtual function to execute ________ class definition version.

A	Base, derived, derived
B	Derived, Derived, Derived
C	Base, derived, base
D	Base, base, derived

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A	class derived_classname : base_classname{ /define class body/ };
B	class base_classname : derived_classname{ /define class body/ };
C	class derived_classname : access base_classname{ /define class body/ };
D	class base_classname :access derived_classname{ /define class body/ };

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