Object Oriented Programming Practice Test 2

1. When an object is passed to a function, its copy is made in the function and then ______________

The destructor is called but it is always implicit

The destructor is never called in this case

The destructor must be user defined

The destructor of the copy is called when function is returned

2. Copy constructor will be called whenever the compiler __________

Generates implicit code

Generates member function calls

Generates object operations

Generates temporary object

3. Using higher degree of abstraction __________

Can increase vulnerability

May get unsafe

May reduce readability

Can be safer

4. If in multiple inheritance, class C inherits class B, and Class B inherits class A. In which sequence are their destructors called if an object of class C was declared?

~A() then ~B() then ~C()

~B() then ~C() then ~A()

~C() then ~A() then ~B()

~C() then ~B() then ~A()

5. Default constructor must be defined, if parameterized constructor is defined and the object is to be created without arguments.

False

True

6. Which constructor will be called from the object obj2 in the following program?

class A
{
	int i;
	A()
	{  
		i=0;  
	}
	A(int x)
	{  
		i=x+1;  
	}
	A(int y, int x)
	{  
		i=x+y;  
	}
};
A obj1(10);
A obj2(10,20);
A obj3;

A(int x)

A(int y; int x)

A(int y)

A(int y, int x)

7. When and how many times a static constructor is called?

Created at time of object destruction

Called at first time when an object is created and only one time

Called at first time when an object is created and called with every new object creation

Called whenever an object go out of scope

8. Which among the following represents correct constructor?

()classname

–classname()

~classname()

classname()

9. Which among the following best describes destructor?

A function which is called before calling any member function

A function which is called after termination of the program

A function which is called after each reference to the object

A function which is called just before the objects are destroyed

10. Which among the following helps to create a temporary instance?

Explicit call to a copy constructor

Implicit call to a default constructor

Explicit call to a constructor

Implicit call to a parameterized constructor