Exercise
1.Which of the following is not correct for virtual function in C++ ?.
A. Virtual function can be static.
B. Virtual function should be accessed using pointers
C. Virtual function is defined in base class
D. Must be declared in public section of class
View Answer
Ans : A
Explanation:: Virtual function is can’t be static in C++.
2.How can we make a class abstract?
A. By declaring it abstract using the static keyword
B. By declaring it abstract using the virtual keyword.
C. By making at least one member function as pure virtual function
D. By making all member functions constant
View Answer
3.How many specifiers are present in access specifiers in class?
A. 2
B. 1
C. 4
D. 3
View Answer
Ans : D
Explanation:There are three types of access specifiers. They are public, protected and private.
4.Which of these following members are not accessed by using direct member access operator?
A. Public
B. Private
C. Protected
D. Both B & C
View Answer
Ans : D
Explanation:Because of the access is given to the private and protected, We can’t access them by using direct member access operator.
5.Which other keywords are also used to declare the class other than class?
A. Struct
B. Union
C. Object
D. Both struct & union
View Answer
Ans : D
Explanation:Struct and union take the same definition of class but differs in the access techniques.
6. Which of the following is true?
A. All objects of a class share all data members of class
B. Objects of a class do not share non-static members. Every object has its own copy
C. Objects of a class do not share codes of non-static methods, they have their own copy
D. None of these
View Answer
Ans : B
Explanation:very object maintains a copy of non-static data members. For example, let Student be a class with data members as name, year, batch. Every object of student will have its own name, year and batch. On a side note, static data members are shared among objects. All objects share codes of all methods
7.Which of the following can be overloaded?
A. Object
B. Operators
C. Both A & B
D. None of the above
View Answer
Ans : C
Explanation:None.
8.Which is also called as abstract class?
A. Virtual function
B. Derived class
C. Pure virtual function
D. None of the mentioned
View Answer
Ans : C
Explanation:Classes that contain at least one pure virtual function are called as abstract base classes.
9.How to access the object in the class?
A. Ternary operator
B. Scope resolution operator
C. Direct member access operator
D. None of the above
View Answer
Ans : C
Explanation:Objects in the method can be accessed using direct member access operator which is (.).
10.When struct is used instead of the keyword class means, what will happen in the program?
A. Access is public by default
B. Access is private by default
C. Access is protected by default
D. None of the mentioned
View Answer
Ans : A
Explanation:None.
11.Which of the following is not a member of class?
A. Static Function.
B. Friend Function
C. Const Function
D. Virtual Function
View Answer
Ans : B
Explanation:Friend function is not a member of class.
12.Constructor is executed when _____.
A. An object goes out of scope.
B. A class is declared
C. An object is created
D. An object is used
View Answer
13.How many ways of reusing are there in class hierarchy?
A. 1
B. 3
C. 4
D. 2
View Answer
Ans : D
Explanation:Class hierarchies promote reuse in two ways. They are code sharing and interface sharing.
14. Where does the object is created?
A. Class
B. Constructor
C. Destructors
D. Attributes
View Answer
Ans : A
Explanation:Explanation: In class, only all the listed items except class will be declared
15.Which of the following is a valid class declaration?
A. Class A { int x; };
B. Class B { }
C. Public class A { }
D. Object A { int x; };
View Answer
16.Which of the following is not correct (in C++) ?
i) Class templates and function templates are instantiated in the same way
ii) Class templates differ from function templates in the way they are initiated
iii) Class template is initiated by defining an object using the template argument
iv) Class templates are generally used for storage classes.
A. i
B. i & ii
C. ii ,iii, iv
D. iv
View Answer
Ans : C
Explanation:In C++ class template and function template are similar in the way the are initiated. Class template are not used for storage class. Class templates and function templates are instantiated in the same way and Class template is not initiated by defining an object using the template. So (2), (3), (4) are not correct in C++.
17. Which of the following statements is correct when a class is inherited publicly?
A. Public members of the base class become protected members of derived class.
B. Public members of the base class become private members of derived class.
C. Private members of the base class become protected members of derived class.
D. Public members of the base class become public members of derived class.
View Answer
18.What does the cerr represent?
A. Standard error stream
B. Standard logging stream
C. Input stream
D. Output stream
View Answer
Ans : A
Explanation:cerr is an object of class ostream that represents the standard error stream. It is associated with the cstdio stream stderr
19.Which of the following keywords is used to control access to a class member?
A. Default
B. Break
C. Protected
D. Asm
View Answer
20.Which of the following statements is incorrect?
A. Destructor of base class should always be static
B. Destructor of base class should always be virtual.
C. Destructor of base class should not be virtual.
D. Destructor of base class should always be private.
View Answer
21. Which operator can not be overloaded?
A. +
B. ::
C. -
D. *
View Answer
Ans : B
Explanation: None
22. When Virtual Table is created?
A. Every Class has VTable
B. Class inherited from other Class
C. Class has atleast one Virtual Function
D. When a Class Overrides the function of Base class
View Answer
Ans : C
Explanation: None
23. What is the size of empty class?
A. 0
B. 2
C. 4
D. 1
View Answer
Ans : D
Explanation: When we create object of empty class at that time State of that object is nothing. Behaviour of that object is also nothing, but compiler assigns a unique address to that object. Memory in Computer is always organized in the form of bytes and minimum memory available at object address location is 1 byte. That's why size of object of empty class is 1 byte.
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