41. What is the main purpose of creating an abstract base class ?

A. creating the dynamic object 

B. dynamic binding 

C. deriving classes 

D. none of these 

42. The size of the object of the class is

A. Sum of sizes of its data and function members 

B. size of its largest data member 

C. size of its largest function member 

D. sum of sizes of its data members 

43. Is implementation of virtual function is efficient to achieve a goal as compared with implementation of non-virtual function?

A. Depends upon implementation 

B. It is efficient 

C. Depends upon stack availability 

D. It is not efficient 

44. When a derived class fails to override a virtual function, then

A. The first redefinition found in reverse order of derivation is used 

B. If the object of the derived class accesses that function, the function defined by the base class is used 

C. Both, 1 and 2 are true 

D. Both, 1 and 2 are false 

45. In C++, a function contained within a class is called ____________

A. a member function 

B. an operator 

C. a class function 

D. a method 

46. Anonymous union means

A. a union having no member 

B. a union having no tag name 

C. a union having only one object 

D. none of the above 

47. If a class D is derived from class A and class B is derived from class D, then it is called as

A. multitple 

B. hierarchical 

C. muli-level 

D. single 

48. Variables are to data types as

A. members are to classes 

B. data items are to classes 

C. objects are to classes 

D. data is to a variable 

49. In inheritance __________

A. it doesn’t work in reverse 

B. the base class and its objects have no knowledge about any classes derived from the base class 

C. A and B 

D. none of the above 

50. The idea behind virtual functions is to _______ the derived class object’s address into a pointer to a base class object

A. downcast 

B. upcast 

C. modify 

D. none of the above 

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