Object Oriented Programming MCQ (Multiple Choice Questions) - SchoolingAxis

Object Oriented Programming MCQ (Multiple Choice Questions)

 Que- An object can be used to represent _________________ 

a. A real world entity 

b. A real function 

c. Some real data only 

d. Some function only 


Ans- A real world entity  


Que- Objects can be used _____________________ 

a. To access any member of a class 

b. To access only public members of a class 

c. To access only protected members of a class 

d. To access only private members of a class 


Ans- To access only public members of a class  


Que- Which among the following is not a use of object? 

a. Defining a member function 

b. Accessing data members 

c. Creating instance of a class 

d. Using class members 


Ans- Defining a member function  


Que- Which object can be used to access the standard input? 

a. System.inner 

b. cin 

c. System.stdin 

d. console.input 


Ans- cin  


Que- A single object can be used __________________ 

a. As only two class types at a time 

b. As only three class types at a time 

c. As only one class type at a time 

d. As of as many class types as required 


Ans- As only one class type at a time  


Que- If same object name is given to different objects of different class then _____________ 

a. Its compile time error 

b. Its runtime error 

c. It's not an error 

d. Program suns smooth 


Ans- Its compile time error  


Que- Which among the following best describes abstract classes? 

a. If a class has more than one virtual function, it's abstract class 

b. If a class have only one pure virtual function, it's abstract class 

c. If a class has at least one pure virtual function, it's abstract class 

d. If a class has all the pure virtual functions only, then it's abstract class 


Ans- If a class has at least one pure virtual function, it's abstract class  


Que- Can abstract class have main() function defined inside it? 

a. Yes, depending on return type of main() 

b. Yes, always 

c. No, main must not be defined inside abstract class 

d. No, because main() is not abstract function 


Ans- Yes, always  


Que- If there is an abstract method in a class then, ________________ 

a. Class must be abstract class 

b. Class may or may not be abstract class 

c. Class is generic 

d. Class must be public 


Ans- Class must be abstract class  


Que- If a class is extending/inheriting another abstract class having abstract method, then _______________________ 

a. Either implementation of method or making class abstract is mandatory 

b. Implementation of the method in derived class is mandatory 

c. Making the derived class also abstract is mandatory 

d. It's not mandatory to implement the abstract method of parent class 


Ans- Either implementation of method or making class abstract is mandatory  


Que- Abstract class A has 4 virtual functions. Abstract class B defines only 2 of those member functions as it extends class A. Class C extends class B and implements the other two member functions of class A. Choose the correct option below. 

a. Program won't run as all the methods are not defined by B 

b. Program won't run as C is not inheriting A directly 

c. Program won't run as multiple inheritance is used 

d. Program runs correctly 


Ans- Program runs correctly  


Que- Abstract classes can ____________________ instances. 

a. Never have 

b. Always have 

c. Have array of 

d. Have pointer of 


Ans- Never have  


Que- We ___________________ to an abstract class. 

a. Can create pointers 

b. Can create references 

c. Can create pointers or references 

d. Can't create any reference, pointer or instance 


Ans- Can create pointers or references  


Que- Which among the following is an important use of abstract classes? 

a. Header files 

b. Class Libraries 

c. Class definitions 

d. Class inheritance 


Ans- Class Libraries  


Que- Use of pointers or reference to an abstract class gives rise to which among the following feature? 

a. Static Polymorphism 

b. Runtime polymorphism 

c. Compile time Polymorphism 

d. Polymorphism within methods 


Ans- Runtime polymorphism  


Que- The abstract classes in java can _________________ 

a. Implement constructors 

b. Can't implement constructor 

c. Can implement only unimplemented methods 

d. Can't implement any type of constructor 


Ans- Implement constructors  


Que- Can abstract classes have static methods (Java)? 

a. Yes, always 

b. Yes, but depends on code 

c. No, never 

d. No, static members can't have different values 


Ans- Yes, always  


Que- A template class can have _____________ 

a. More than one generic data type 

b. Only one generic data type 

c. At most two data types 

d. Only generic type of integers and not characters 


Ans- More than one generic data type  


Que- Which among the following is the proper syntax for the template class? 

a. template ; 

b. Template ; 

c. template T named(T x, T y){ } 

d. Template T1 named(T1 x, T2 y){ } 


Ans- template T named(T x, T y){ }  


Que- Can default arguments be used with the template class? 

a. Yes, in some special cases 

b. Yes, always 

c. No, it must satisfy some specific conditions first 

d. No, it can't be done 


Ans- Yes, always  


Que- What is the syntax to use explicit class specialization? 

a. template class myClass<>{ } 

b. template class myClass{ } 

c. template <> class myClass<>{ } 

d. template <> class myClass{ } 


Ans- template <> class myClass{ }  


Que- Which is the most significant feature that arises by using template classes? 

a. Code readability 

b. Ease in coding 

c. Code reusability 

d. Modularity in code 


Ans- Code reusability  


Que- A template class defines the form of a class _____________________ it will operate. 

a. With full specification of the data on which 

b. With full specification of the functions on which 

c. Without full specification of the data on which 

d. Without full specification of the functions on which 


Ans- Without full specification of the data on which  


Que- What are the two specializations of I/O template classes in C++? 

a. 16-bit character and wide characters 

b. 8-bit character and wide characters 

c. 32-bit character and locale characters 

d. 64-bit characters and locale characters 


Ans- 8-bit character and wide characters  


Que- Can typeid() function be used with the object of generic classes? 

a. Yes, only if default type is given 

b. Yes, always 

c. No, generic data can't be determined 

d. No, never possible 


Ans- Yes, always  


Que- The _____________ class is a specialization of a more general template class. 

a. String 

b. Integer 

c. Digit 

d. Math 


Ans- String  


Que- How is function overloading different from template class? 

a. Overloading is multiple function doing same operation, Template is multiple function doing different operations 

b. Overloading is single function doing different operations, Template is multiple function doing different operations 

c. Overloading is multiple function doing similar operation, Template is multiple function doing identical operations 

d. Overloading is multiple function doing same operation, Template is same function doing different operations 


Ans- Overloading is multiple function doing similar operation, Template is multiple function doing identical operations  


Que- What if static members are declared inside template classes? 

a. All instances will share the static variable 

b. All instances will have their own static variable 

c. All the instances will ignore the static variable 

d. Program gives compile time error 


Ans- All instances will have their own static variable  


Que- If template class is defined, is it necessary to use different types of data for each call? 

a. No, not necessary 

b. No, but at least two types must be there 

c. Yes, to make proper use of template 

d. Yes, for code efficiency 


Ans- No, not necessary  


Que- How many generic types can be given inside a single template class? 

a. Only 1 

b. Only 3 

c. Only 7 

d. As many as required 


Ans- As many as required  


Que- Which is most appropriate definition of a base class? 

a. It is parent of any of its derived class 

b. It is child of one of the parent class 

c. It is most basic class of whole program 

d. It is class with maximum number of members 


Ans- It is parent of any of its derived class  


Que- A base class is also known as _____________ class. 

a. Basic 

b. Inherited 

c. Super 

d. Sub 


Ans- Super  


Que- An abstract class is always a __________ class. 

a. Base 

b. Derived 

c. Template 

d. Nested 


Ans- Base  


Que- How many base classes can a single class inherit in java? 

a. 1 

b. 2 

c. 3 

d. As many as required 


Ans- 1  


Que- How to make a derived class a base class? 

a. Change name of the class 

b. Use keyword base 

c. Make a class derive from it 

d. Can't be done 


Ans- Make a class derive from it  


Que- If a base class is being derived by two other classes, which inheritance will that be called? 

a. Single 

b. Multiple 

c. Multi-level 

d. Hierarchical 


Ans- Hierarchical  


Que- Which among the following must be in a base class? 

a. Data members 

b. Member functions 

c. Access specifiers 

d. Nothing 


Ans- Nothing  


Que- Which type of members can't be accessed in derived classes of a base class? 

a. Protected 

b. Private 

c. Public 

d. All can be accessed 


Ans- Private  


Que- Base class have ________________ of abstraction. 

a. Higher degree 

b. Lower degree 

c. Intermediate 

d. Minimum degree 


Ans- Lower degree  


Que- Always the base class constructors are called ___________ constructor of derived class. 

a. Before 

b. After 

c. Along 

d. According to priority of 


Ans- Before  


Que- Can we call methods of base class using constructor of the derived class? 

a. Yes, always 

b. Yes, but not always 

c. No, never 

d. No, but we can call in some cases 


Ans- Yes, always  


Que- If a base class is inherited from another class and then one class derives it, which inheritance is shown? 

a. Multiple 

b. Single 

c. Hierarchical 

d. Multi-level 


Ans- Multi-level  


Que- How many base classes can a single derived class have in C++? 

a. 1 

b. 2 

c. 3 

d. As many as required 


Ans- As many as required  


Que- Which among the following is best definition of a derived class? 

a. A child class 

b. A class which inherits one or more classes 

c. A class with keyword derived 

d. A class with more than one constructor 


Ans- A class which inherits one or more classes  


Que- Which among the following is inherited by a derived class from base class? 

a. Data members only 

b. Member functions only 

c. All the members except private members 

d. All the members of base class 


Ans- All the members except private members  


Que- If there is a derived class in a program, how many classes must be in that program? 

a. 1 

b. 2 

c. 3 

d. 4 


Ans- 2  


Que- Which members can never be accessed in derived class from the base class? 

a. Private 

b. Protected 

c. Public 

d. All except private 


Ans- All except private  


Que- How many types of inheritance are supported in C++ for deriving a class? 

a. 1 

b. 2 

c. 3 

d. 4 


Ans- 3  


Que- How many derived class can a single base class have? 

a. 1 

b. 2 

c. 3 

d. As many are required 


Ans- As many are required  


Que- Which among the following is correct? 

a. Friend function of derived class can access non-private members of base class 

b. Friend function of base class can access derived class members 

c. Friend function of derived class can access members of only derived class 

d. Friend function can access private members of base class of a derived class 


Ans- Friend function of derived class can access non-private members of base class  


Que- If a class is being derived using more than two base classes, which inheritance will be used? 

a. Single 

b. Multi-level 

c. Hierarchical 

d. Multiple 


Ans- Multiple  


Que- Derived class is also known as ______________ class. 

a. Subclass 

b. Small class 

c. Big class 

d. Noticeable class 


Ans- Subclass  


Que- If class A is derived from another derived class B which is derived from class C, which class will have maximum level of abstraction? 

a. Class A 

b. Class B 

c. Class C 

d. All have same level of abstraction 


Ans- Class C  


Que- If base class is an abstract class then derived class ______________ the undefined functions. 

a. Must define 

b. Must become another abstract class or define 

c. Must become parent class for 

d. Must implement 2 definitions of 


Ans- Must become another abstract class or define  


Que- How many classes can be derived from a derived class? 

a. Only 1 

b. At most 1 

c. At least 1 

d. As many as required 


Ans- As many as required  


Que- Which feature is not related to the derived classes among the following? 

a. Inheritance 

b. Encapsulation 

c. Run time memory management 

d. Compile time function references 


Ans- Run time memory management  


Que- Deriving a class in such a way that that the base class members are not available for further inheritance is known as ___________________ 

a. Public inheritance 

b. Protected inheritance 

c. Protected or private inheritance 

d. Private inheritance 


Ans- Private inheritance  


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