Object Oriented Programming MCQ (Multiple Choice Questions) - SchoolingAxis

Object Oriented Programming MCQ (Multiple Choice Questions)

 Que- Which programming language restricts the use of multiple inheritance? 

a. C++ 

b. PHP 

c. SmallTalk 

d. Java 


Ans- Java  


Que- Is it possible to have all the abstract classes as base classes of a derived class from those? 

a. Yes, always 

b. Yes, only if derived class implements all the methods 

c. No, because abstract classes doesn't have constructors 

d. No, never 


Ans- Yes, only if derived class implements all the methods  


Que- If class A inherits class B and class C as ???class A: public class B, public class C {// class body ;}; ???, which class constructor will be called first? 

a. Class A 

b. Class B 

c. Class C 

d. All together 


Ans- Class B  


Que- Why does diamond problem arise due to multiple inheritance? 

a. Methods with same name creates ambiguity and conflict 

b. Methods inherited from the superclass may conflict 

c. Derived class gets overloaded with more than two class methods 

d. Derived class can't distinguish the owner class of any derived method 


Ans- Methods with same name creates ambiguity and conflict  


Que- How many base classes can a derived class have which is implementing multiple inheritance? 

a. Only 2 

b. At least 2 

c. At most 2 

d. As many as required 


Ans- As many as required  


Que- How to overcome diamond problem ? 

a. Using alias name 

b. Using seperate derived class 

c. Using virtual keyword with same name function 

d. Can't be done 


Ans- Using virtual keyword with same name function  


Que- When multiple inheritance is used, which class object should be used in order to access all the available members of parent and derived class ? 

a. Derived class object 

b. Parent class objects 

c. Use Abstract derived class 

d. Derive a class from derived class 


Ans- Derived class object  


Que- If all the members of all the base classes are private then, 

a. There won't be any use of multiple inheritance 

b. It will make those members public 

c. Derived class can still access them in multiple inheritance 

d. Compile time error 


Ans- There won't be any use of multiple inheritance  


Que- Is it compulsory to have constructor for all the classes involved in multiple inheritance? 

a. Yes, always 

b. Yes, only if no abstract class is involved 

c. No, only classes being used should have a constructor 

d. No, they must not contain constructors 


Ans- Yes, only if no abstract class is involved  


Que- If a class contains 2 nested class and is being inherited by another class, will there be any multiple inheritance? 

a. No, only single level inheritance is used 

b. No, only multilevel inheritance is used 

c. Yes, because 3 classes are involved 

d. Yes, because more than 1 classes are being derived 


Ans- No, only single level inheritance is used  


Que- Which members can't be accessed in derived class in multiple inheritance ? 

a. Private members of base 

b. Public members of base 

c. Protected members of base 

d. All the members of base 


Ans- Private members of base  


Que- Can the derived class be made abstract if multiple inheritance is used ? 

a. No, because other classes must be abstract too 

b. Yes, if all the functions are implemented 

c. Yes, if all the methods are predefined 

d. No, since constructors won't be there 


Ans- No, since constructors won't be there  


Que- Which among the following is best to define hierarchical inheritance? 

a. More than one classes being derived from one class 

b. More than 2 classes being derived from single base class 

c. At most 2 classes being derived from single base class 

d. At most 1 class derived from another class 


Ans- More than one classes being derived from one class  


Que- Do members of base class gets divided among all of its child classes ? 

a. Yes, equally 

b. Yes, depending on type of inheritance 

c. No, it's doesn't get divided 

d. No, it may or may not get divided 


Ans- No, it's doesn't get divided  


Que- Each class can inherit the base class ________________ 

a. Independently using any inheritance 

b. Independently with private inheritance only 

c. With same type of inheritance 

d. With each class using different inheritance only 


Ans- Independently using any inheritance  


Que- How many classes must be there to implement hierarchical inheritance ? 

a. Exactly 3 

b. At least 3 

c. At most 3 

d. At least 1 


Ans- At least 3  


Que- Base class _______________ 

a. Can be made abstract 

b. Can't be made abstract 

c. Must be abstract 

d. If made abstract, compile time error 


Ans- Can be made abstract  


Que- Which access specifiers should be used so that all the derived classes restrict further inheritance of base class members? 

a. Private 

b. Public 

c. Protected 

d. Any inheritance type can be used 


Ans- Private  


Que- How many classes can be derived from the base class using hierarchical inheritance? 

a. As many as required 

b. Only 7 

c. Only 3 

d. Up to 127 


Ans- As many as required  


Que- Which among the following is true ? 

a. Hierarchical inheritance is subset of multiple inheritance 

b. Hierarchical inheritance is strongest inheritance type 

c. Hierarchical inheritance uses only 2 classes for implementation 

d. Hierarchical inheritance allows inheritance of common features to more than one class 


Ans- Hierarchical inheritance allows inheritance of common features to more than one class  


Que- Hierarchical inheritance can be a subset of _________________ 

a. Hybrid inheritance 

b. Multiple inheritance 

c. Single level inheritance 

d. Multilevel inheritance 


Ans- Hybrid inheritance  


Que- Which type of inheritance is most suitable for inheriting Same syllabus into different colleges with different streams? 

a. Multiple 

b. Single 

c. Hierarchical 

d. Multilevel 


Ans- Hierarchical  


Que- Which class constructor is called first when an object of derived class is created? 

a. Base class constructor 

b. Derived class constructor 

c. Firstly created derived class constructor 

d. Last created derived class constructor 


Ans- Base class constructor  


Que- Which among the following best defines the hybrid inheritance? 

a. Combination of two or more inheritance types 

b. Combination of same type of inheritance 

c. Inheritance of more than 7 classes 

d. Inheritance involving all the types of inheritance 


Ans- Combination of two or more inheritance types  


Que- How many types of inheritance should be used for hybrid ? 

a. Only 1 

b. At east 2 

c. At most two 

d. Always more than 2 


Ans- At east 2  


Que- If single inheritance is used with class A and B. A is base class. Then class C,D and E where C is base class and D is derived from C, then E is derived from D. Class C is made to inherit from class B. Which is the resultant type ? 

a. Single level 

b. Multilevel 

c. Hybrid 

d. Multiple 


Ans- Multilevel  


Que- Diamond problem includes ____________________ hybrid inheritance 

a. Hierarchical and Multiple 

b. Hierarchical and Hierarchical 

c. Multiple and Multilevel 

d. Single, Hierarchical and Multiple 


Ans- Hierarchical and Multiple  


Que- If __________________ inheritance is done continuously, it is similar to tree structure. 

a. Hierarchical 

b. Multiple 

c. Multilevel 

d. Hierarchical and Multiple 


Ans- Hierarchical  


Que- Which amongst the following is true for hybrid inheritance? 

a. Constructor calls are in reverse 

b. Constructor calls are priority based 

c. Constructor of only derived class is called 

d. Constructor calls are usual 


Ans- Constructor calls are usual  


Que- Which type of inheritance must be used so that the resultant is hybrid? 

a. Multiple 

b. Hierarchical 

c. Multilevel 

d. None 


Ans- None  


Que- The private member's are made public to all the classes in inheritance. 

a. True 

b. False 

c. Partially True 

d. None of the mentioned 


Ans- False  


Que- If hierarchical inheritance requires to inherit more than one class to single class, which syntax is correct? ( A,B,C are class names ) 

a. hierarchical class A: public B, public C 

b. multiple class A: public B, public C 

c. many class A: public B, public C 

d. class A: public B, public C 


Ans- class A: public B, public C  


Que- What is the maximum number of classes allowed in hybrid inheritance? 

a. 7 

b. 127 

c. 255 

d. As many as required 


Ans- As many as required  


Que- What is the minimum number of classes to be there in a program implementing hybrid inheritance? 

a. 2 

b. 3 

c. 4 

d. No limit 


Ans- No limit  


Que- If object of lowest level class is created ( last derived class ), _________________ of its parent class constructors are calle

d. 

a. Few 

b. All 

c. Only parent and parent 

d. Base and Derived 


Ans- Only parent and parent  


Que- If hybrid inheritance is used, it mostly shows _______________ feature of OOP. 

a. Flexibility 

b. Reusability 

c. Efficiency 

d. Code readability 


Ans- Reusability  


Que- The sequence of destructors being called while using hybrid inheritance is ____________ 

a. Reverse of constructors being called 

b. Reverse of classes being made 

c. Reverse of objects being created 

d. Reverse of code calling objects 


Ans- Reverse of constructors being called  


Que- 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 


Ans- Base, derived, derived  


Que- 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 


Ans- Correct method is called, regardless of the type of reference used for function call  


Que- Virtual functions are mainly used to achieve _____________ 

a. Compile time polymorphism 

b. Interpreter polymorphism 

c. Runtime polymorphism 

d. Functions code polymorphism 


Ans- Runtime polymorphism  


Que- Which keyword is used to declare virtual functions? 

a. virtual 

b. virt 

c. anonymous 

d. virtually 


Ans- virtual  


Que- Where the virtual function should be defined? 

a. Twice in base class 

b. Derived class 

c. Base class and derived class 

d. Base class 


Ans- Base class  


Que- The resolving of virtual functions is done at ______________ 

a. Compile time 

b. Interpret time 

c. Runtime 

d. Writing source code 


Ans- Runtime  


Que- In which access specifier should a virtual function be defined? 

a. Private 

b. Public 

c. Protected 

d. Default 


Ans- Public  


Que- Virtual functions can never be made _______________ 

a. Static function 

b. Parameterized function 

c. Default argument function 

d. Zero parameter function 


Ans- Static function  


Que- Which is must condition for virtual function to achieve runtime polymorphism? 

a. Virtual function must be accessed with direct name 

b. Virtual functions must be accessed using base class object 

c. Virtual function must be accessed using pointer or reference 

d. Virtual function must be accessed using derived class object only 


Ans- Virtual function must be accessed using pointer or reference  


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