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C++ Programming MCQ (Multiple Choice Questions) - SchoolingAxis

C++ Programming MCQ (Multiple Choice Questions) - SchoolingAxis

C++ Programming MCQ (Multiple Choice Questions)

 Que- What is the identifier given to string class to declare string objects? 

a. String 

b. string 

c. STRING 

d. Any of the above can be used 


Answer- string 


Que- What is the role of a constructor in classes? 

a. To modify the data whenever required 

b. To destroy an object 

c. To initialize the data members of an object when it is created 

d. To call private functions from the outer world 


Answer- To initialize the data members of an object when it is created 


Que- Why constructors are efficient instead of a function init() defined by the user to initialize the data members of an object? 

a. Because user may forget to call init() using that object leading segmentation fault 

b. Because user may call init() more than once which leads to overwriting values 

c. Because user may forget to define init() function 

d. All of the mentioned 


Answer- All of the mentioned 


Que- What is a copy constructor? 

a. A constructor that allows a user to move data from one object to another 

b. A constructor to initialize an object with the values of another object 

c. A constructor to check the whether to objects are equal or not 

d. A constructor to kill other copies of a given object. 


Answer- A constructor to initialize an object with the values of another object 


Que- What happens if a user forgets to define a constructor inside a class? 

a. Error occurs 

b. Segmentation fault 

c. Objects are not created properly 

d. Compiler provides a default constructor to avoid faults/errors 


Answer- Compiler provides a default constructor to avoid faults/errors 


Que- How many parameters does a default constructor require? 

a. 1 

b. 2 

c. 0 

d. 3 


Answer- 0 


Que- How constructors are different from other member functions of the class? 

a. Constructor has the same name as the class itself 

b. Constructors do not return anything 

c. Constructors are automatically called when an object is created 

d. All of the mentioned 


Answer- All of the mentioned 


Que- How many types of constructors are there in C++? 

a. 1 

b. 2 

c. 3 

d. 4 


Answer- 3 


Que- What is the role of destructors in Classes? 

a. To modify the data whenever required 

b. To destroy an object when the lifetime of an object ends 

c. To initialize the data members of an object when it is created 

d. To call private functions from the outer world 


Answer- To destroy an object when the lifetime of an object ends 


Que- What is syntax of defining a destructor of class A? 

a. A(){} 

b. ~A(){} 

c. A::A(){} 

d. ~A(){}; 


Answer- ~A(){} 


Que- When destructors are called? 

a. When a program ends 

b. When a function ends 

c. When a delete operator is used 

d. All of the mentioned 


Answer- All of the mentioned 


Que- What is the difference between constructors and destructors? 

a. They have a different function name 

b. Constructors does not have return type whereas destructors do have 

c. Constructors allow function parameters whereas destructors do not 

d. Constructors does not function parameters 


Answer- Constructors allow function parameters whereas destructors do not 


Que- How many Destructors are allowed in a Class? 

a. 1 

b. 2 

c. 3 

d. Any number 


Answer- 1 


Que- Which of the following constructors are provided by the C++ compiler if not defined in a class? 

a. Default constructor 

b. Assignment constructor 

c. Copy constructor 

d. All of the mentioned 


Answer- All of the mentioned 


Que- When a copy constructor is called? 

a. When an object of the class is returned by value 

b. When an object of the class is passed by value to a function 

c. When an object is constructed based on another object of the same class 

d. All of the mentioned 


Answer- All of the mentioned 


Que- How destructor overloading is done? 

a. By changing the number of parameters 

b. By changing the parameters type 

c. By changing both the number of parameters and their type 

d. No chance for destructor overloading 


Answer- No chance for destructor overloading 


Que- Which of the following is correct? 

a. Destructors can be virtual 

b. There can be more than one destructor in a class 

c. Destructor definition starts with ! 

d. Destructor is used to initialize objects 


Answer- Destructors can be virtual 


Que- Where is the derived class is derived from? 

a. derived 

b. base 

c. both derived & base 

d. class 


Answer- base 


Que- Pick out the correct statement. 

a. A derived class's constructor cannot explicitly invokes its base class's constructor 

b. A derived class's destructor cannot invoke its base class's destructor 

c. A derived class's destructor can invoke its base class's destructor 

d. A derived class's destructor can invoke its base & derived class's destructor 


Answer- A derived class's destructor cannot invoke its base class's destructor 


Que- Which of the following can derived class inherit? 

a. members 

b. functions 

c. both members & functions 

d. classes 


Answer- both members & functions 


Que- Which operator is used to declare the destructor? 

a. # 

b. ~ 

c. @ 

d. $ 


Answer- ~ 


Que- Which constructor will initialize the base class data member? 

a. derived class 

b. base class 

c. class 

d. derived & base class 


Answer- base class 


Que- Which class is used to design the base class? 

a. abstract class 

b. derived class 

c. base class 

d. derived & base class 


Answer- abstract class 


Que- Which is used to create a pure virtual function? 

a. $ 

b. =0 

c. & 

d. ! 


Answer- =0 


Que- Which is also called as abstract class? 

a. virtual function 

b. pure virtual function 

c. derived class 

d. base class 


Answer- pure virtual function 


Que- What is meant by pure virtual function? 

a. Function which does not have definition of its own 

b. Function which does have definition of its own 

c. Function which does not have any return type 

d. Function which does not have any return type & own definition 


Answer- Function which does not have definition of its own 


Que- Pick out the correct option. 

a. We cannot make an instance of an abstract base class 

b. We can make an instance of an abstract base class 

c. We can make an instance of an abstract super class 

d. We can make an instance of an abstract derived class 


Answer- We cannot make an instance of an abstract base class 


Que- Where does the abstract class is used? 

a. base class only 

b. derived class 

c. both derived & base class 

d. virtual class 


Answer- base class only 


Que- What is an abstract class in C++? 

a. Class specifically used as a base class with atleast one virtual functions 

b. Class specifically used as a base class with atleast one pure virtual functions 

c. Class from which any class is derived 

d. Any Class in C++ is an abstract class 


Answer- Class specifically used as a base class with atleast one pure virtual functions 


Que- What is a pure virtual function in C++? 

a. A virtual function defined in a base class 

b. A virtual function declared in a base class 

c. Any function in a class 

d. A function without definition in a base class 


Answer- A virtual function declared in a base class 


Que- Which is the correct syntax of defining a pure virtual function? 

a. pure virtual return_type func(); 

b. virtual return_type func() pure; 

c. virtual return_type func() = 0; 

d. virtual return_type func(); 


Answer- virtual return_type func() = 0; 


Que- Which is the correct statement about pure virtual functions? 

a. They should be defined inside a base class 

b. Pure keyword should be used to declare a pure virtual function 

c. Pure virtual function is implemented in derived classes 

d. Pure virtual function cannot implemented in derived classes 


Answer- Pure virtual function is implemented in derived classes 


Que- Pick the correct statement. 

a. Pure virtual functions and virtual functions are the same 

b. Both Pure virtual function and virtual function have an implementation in the base class 

c. Pure virtual function has no implementation in the base class whereas virtual function may have an implementation in the base class 

d. The base class has no pure virtual function 


Answer- Pure virtual function has no implementation in the base class whereas virtual function may have an implementation in the base class 


Que- Which interface determines how your class will be used by another program? 

a. public 

b. private 

c. protected 

d. void 


Answer- public 


Que- Pick out the correct statement about the override. 

a. Overriding refers to a derived class function that has the same name and signature as a base class virtual function 

b. Overriding has different names 

c. Overriding refers to a derived class 

d. Overriding has different names & it refers to a derived class 


Answer- Overriding refers to a derived class function that has the same name and signature as a base class virtual function 


Que- How many ways of reusing are there in the class hierarchy? 

a. 1 

b. 2 

c. 3 

d. 4 


Answer- 2 


Que- How many types of class are there in c++? 

a. 1 

b. 2 

c. 3 

d. 4 


Answer- 3 


Que- Pick out the correct statement about multiple inheritances. 

a. Deriving a class from one direct base class 

b. Deriving a class from more than one direct base class 

c. Deriving a class from more than one direct derived class 

d. Deriving a class from more than one direct derivedbase class 


Answer- Deriving a class from more than one direct base class 


Que- What does inheritance allow you to do? 

a. create a class 

b. create a hierarchy of classes 

c. access methods 

d. create a method 


Answer- create a hierarchy of classes 


Que- What is the syntax of inheritance of class? 

a. class name 

b. class name: access specifier 

c. class name: access specifier class name 

d. access specifier class name 


Answer- class name: access specifier class name 


Que- How many kinds of classes are there in c++? 

a. 1 

b. 2 

c. 3 

d. 4 


Answer- 2 


Que- What is meant by polymorphism? 

a. class having many forms 

b. class having only single form 

c. class having two forms 

d. class having four forms 


Answer- class having many forms 


Que- How many types of inheritance are there in c++? 

a. 2 

b. 3 

c. 4 

d. 5 


Answer- 5 


Que- What is meant by container ship? 

a. class contains objects of other class types as its members 

b. class contains objects of other class types as its objects 

c. class contains objects of other class types as its members 7 also objects 

d. class contains objects of other class types as its members 9 also objects 


Answer- class contains objects of other class types as its members 


Que- How many types of the constructor are there in C++? 

a. 1 

b. 2 

c. 3 

d. 4 


Answer- 3 


Que- How many constructors can present in a class? 

a. 1 

b. 2 

c. 3 

d. multiple 


Answer- multiple 


Que- What should be the name of the constructor? 

a. same as the object 

b. same as the member 

c. same as the class 

d. same as the function 


Answer- same as the class 


Que- What does derived class does not inherit from the base class? 

a. constructor and destructor 

b. friends 

c. operator = () members 

d. all of the mentioned 


Answer- all of the mentioned 


Que- What is a template? 

a. A template is a formula for creating a generic class 

b. A template is used to manipulate the class 

c. A template is used for creating the attributes 

d. A template is used to delete the class 


Answer- A template is a formula for creating a generic class 


Que- Pick out the correct statement about string template. 

a. It is used to replace a string 

b. It is used to replace a string with another string at runtime 

c. It is used to delete a string 

d. It is used to create a string 


Answer- It is used to replace a string with another string at runtime 


Que- How to declare a template? 

a. tem 

b. temp 

c. template<> 

d. temp() 


Answer- template<>