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Object Oriented Programming MCQ (Multiple Choice Questions) - SchoolingAxis

Object Oriented Programming MCQ (Multiple Choice Questions) - SchoolingAxis

Object Oriented Programming MCQ (Multiple Choice Questions)

 Que- 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 


Ans- The declaration must be exactly the same in base and derived class  


Que- 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 


Ans- All the same return type, name and parameter list  


Que- How to access the overridden method of base class from the derived class? 

a. Using arrow operator 

b. Using dot operator 

c. Using scope resolution operator 

d. Can't be accessed once overridden 


Ans- Using scope resolution operator  


Que- The functions to be overridden _____________ 

a. Must be private in base class 

b. Must not be private base class 

c. Must be private in both derived and base class 

d. Must not be private in both derived and base class 


Ans- Must not be private base class  


Que- Which language doesn't support method overriding implicitly? 

a. C++ 

b. C Sharp 

c. Java 

d. SmallTalk 


Ans- C Sharp  


Que- In C Sharp ____________________ 

a. Non- virtual or static methods can't be overridden 

b. Non- virtual and static methods only can be overridden 

c. Overriding is not allowed 

d. Overriding must be implemented using C++ code only 


Ans- Non- virtual or static methods can't be overridden  


Que- In Delphi ______________ 

a. Method overriding is done implicitly 

b. Method overriding is not supported 

c. Method overriding is done with directive override 

d. Method overriding is done with the directive virtually 


Ans- Method overriding is done with directive override  


Que- What should be used to call the base class method from the derived class if function overriding is used in Java? 

a. Keyword super 

b. Scope resolution 

c. Dot operator 

d. Function name in parenthesis 


Ans- Keyword super  


Que- In Kotlin, the function to be overridden must be ______________ 

a. Private 

b. Open 

c. Closed 

d. Abstract 


Ans- Open  


Que- Abstract functions of a base class _________________ 

a. Are overridden by the definition in same class 

b. Are overridden by the definition in parent class 

c. Are not overridden generally 

d. Are overridden by the definition in derived class 


Ans- Are overridden by the definition in derived class  


Que- If virtual functions are defined in the base class then _______________ 

a. It is not necessary for derived classes to override those functions 

b. It is necessary for derived classes to override those functions 

c. Those functions can never be derived 

d. Those functions must be overridden by all the derived classes 


Ans- It is not necessary for derived classes to override those functions  


Que- Which feature of OOP is exhibited by the function overriding? 

a. Inheritance 

b. Abstraction 

c. Polymorphism 

d. Encapsulation 


Ans- Polymorphism  


Que- What are constant member functions? 

a. Functions which doesn't change value of calling object 

b. Functions which doesn't change value of any object inside definition 

c. Functions which doesn't allow modification of any object of class 

d. Functions which doesn't allow modification of argument objects 


Ans- Functions which doesn't change value of calling object  


Que- Which keyword must be used to declare a member function as a constant member function? 

a. Constant 

b. Const 

c. FunctionConst 

d. Unchanged 


Ans- Const  


Que- Which objects can call the const functions? 

a. Only const objects 

b. Only non-const objects 

c. Both const and non-const objects 

d. Neither const not non-const objects 


Ans- Both const and non-const objects  


Que- Non-const functions _______________________ 

a. Can be called only from non-const object 

b. Can be called only from const object 

c. Can be called both by const and non-const object 

d. Can't be called with object 


Ans- Can be called only from non-const object  


Que- Which is a correct condition on const member functions? 

a. Const member functions can't call non-const member functions 

b. Const member functions can't call any other function 

c. Const member functions can call only the functions which are neither const nor non-const 

d. Const member functions can call only data members of call not member functions 


Ans- Const member functions can't call non-const member functions  


Que- If a const object calls a non-const member function then ____________________ 

a. Run time error may get produced 

b. Compile time error may get produced 

c. Either compile time or run time error is produced 

d. The program can't be compiled 


Ans- Compile time error may get produced  


Que- Can a constructor function be constant? 

a. Yes, always 

b. Yes, only if permissions are given 

c. No, because objects are not involved 

d. No, never 


Ans- No, never  


Que- How is it possible to have both const and non-const version of a function? 

a. Function overriding 

b. Function prototyping 

c. Function overloading 

d. Function declaring 


Ans- Function overloading  


Que- When both the const and non-const version of a functions are required? 

a. Return value have to be different in const 

b. Return value have to be same in const 

c. Return values have to be ignored 

d. Return values have to be suppressed 


Ans- Return value have to be different in const  


Que- If a function is to be made const, which is the correct syntax? 

a. const functionName(parameters); 

b. const returnType functionName(parameters); 

c. const functionName(returnType)(Parameters); 

d. const (functionName(parameters)); 


Ans- const returnType functionName(parameters);  


Que- Functions which differ in const-ness are considered ______________________ 

a. To have same signature 

b. To have different signature 

c. To produce compile time error 

d. To produce runtime error 


Ans- To have different signature  


Que- If const version of a function when overloading is used, the function ___________________ 

a. Returns reference to object 

b. Returns volatile reference 

c. Returns mutable reference 

d. Returns const reference 


Ans- Returns const reference  


Que- Which among the following is recommended for const functions? 

a. Const function use should be reduced in a program 

b. Const function use should be more in a program 

c. Const function use should not matter in a program 

d. Const function use should be able to modify the values 


Ans- Const function use should be more in a program  


Que- Use of const member function in a program _________________________ 

a. Is mandatory, always 

b. Is optional, always 

c. Is mandatory, if objects are used 

d. Is optional, if const objects are used 


Ans- Is optional, always  


Que- Which is private member functions access scope? 

a. Member functions which can only be used within the class 

b. Member functions which can used outside the class 

c. Member functions which are accessible in derived class 

d. Member functions which can't be accessed inside the class 


Ans- Member functions which can only be used within the class  


Que- Which among the following is true? 

a. The private members can't be accessed by public members of the class 

b. The private members can be accessed by public members of the class 

c. The private members can be accessed only by the private members of the class 

d. The private members can't be accessed by the protected members of the class 


Ans- The private members can be accessed by public members of the class  


Que- Which member can never be accessed by inherited classes? 

a. Private member function 

b. Public member function 

c. Protected member function 

d. All can be accessed 


Ans- Private member function  


Que- Which syntax among the following shows that a member is private in a class? 

a. private: functionName(parameters) 

b. private(functionName(parameters)) 

c. private functionName(parameters) 

d. private::functionName(parameters) 


Ans- private functionName(parameters)  


Que- If private member functions are to be declared in C++ then _____________ 

a. private:  

b. private  

c. private(private member list) 

d. private :- <private members> 


Ans- private:   


Que- In java, which rule must be followed? 

a. Keyword private preceding list of private member's 

b. Keyword private with a colon before list of private member's 

c. Keyword private with arrow before each private member 

d. Keyword private preceding each private member 


Ans- Keyword private preceding each private member  


Que- How many private member functions are allowed in a class ? 

a. Only 1 

b. Only 7 

c. Only 255 

d. As many as required 


Ans- As many as required  


Que- How to access a private member function of a class? 

a. Using object of class 

b. Using object pointer 

c. Using address of member function 

d. Using class address 


Ans- Using address of member function  


Que- Private member functions ____________ 

a. Can't be called from enclosing class 

b. Can be accessed from enclosing class 

c. Can be accessed only if nested class is private 

d. Can be accessed only if nested class is public 


Ans- Can't be called from enclosing class  


Que- Which function among the following can't be accessed outside the class in java in same package? 

a. public void show() 

b. void show() 

c. protected show() 

d. static void show() 


Ans- protected show()  


Que- If private members are to be called outside the class, which is a good alternative? 

a. Call a public member function which calls private function 

b. Call a private member function which calls private function 

c. Call a protected member function which calls private function 

d. Not possible 


Ans- Call a public member function which calls private function  


Que- Which error will be produced if private members are accessed? 

a. Can't access private message 

b. Code unreachable 

c. Core dumped 

d. Bad code 


Ans- Can't access private message  


Que- Can main() function be made private? 

a. Yes, always 

b. Yes, if program doesn't contain any classes 

c. No, because main function is user defined 

d. No, never 


Ans- No, never  


Que- If a function in java is declared private then it __________________ 

a. Can't access the standard output 

b. Can access the standard output 

c. Can't access any output stream 

d. Can access only the output streams 


Ans- Can access the standard output  


Que- What are public member functions? 

a. Functions accessible outside the class but not in derived class 

b. Functions accessible outside the class directly 

c. Functions accessible everywhere using object of class 

d. Functions that can't be accessed outside the class 


Ans- Functions accessible everywhere using object of class  


Que- Which among the following is true for public member functions? 

a. Public member functions doesn't have a return type 

b. Public member functions doesn't have any security 

c. Public member functions are declared outside the class 

d. Public member functions can be called using object of class 


Ans- Public member functions can be called using object of class  


Que- Which type of member functions get inherited in the same specifier in which the inheritance is done? (If private inheritance is used, those become private and if public used, those become publi 

a. Private member functions 

b. Protected member functions 

c. Public member functions 

d. All member functions 


Ans- Public member functions