In how many ways can an object be passed to a function?
a) 1
b) 2
c) 3
d) 4
Q.2.
If an object is passed by value _____________
a) A new copy of object is created implicitly
b) The object itself is used
c) Address of the object is passed
d) A new object is created with new random values
Q.3.
Pass by address passes the address of object _________ and pass by reference passes the address of the object _________
a) Explicitly, explicitly
b) Implicitly, implicitly
c) Explicitly, Implicitly
d) Implicitly, explicitly
Q.4.
If an object is passed by reference, the changes made in the function ___________
a) Are reflected to the main object of caller function too
b) Are reflected only in local scope of the called function
c) Are reflected to the copy of the object that is made during pass
d) Are reflected to caller function object and called function object also
Q.5.
Constructor function is not called when an object is passed to a function, will its destructor be called when its copy is destroyed?
a) Yes, depending on code
b) Yes, must be called
c) No, since no constructor was called
d) No, since same object gets used
Q.6.
When an object is returned by a function, a _______________ is automatically created to hold the return value.
a) Temporary object
b) Virtual object
c) New object
d) Data member
Q.7.
Is the destruction of temporary object safe (while returning object)?
a) Yes, the resources get free to use
b) Yes, other objects can use the memory space
c) No, unexpected side effects may occur
d) No, always gives rise to exceptions
Q.8.
How to overcome the problem arising due to destruction of temporary object?
a) Overloading insertion operator
b) Overriding functions can be used
c) Overloading parenthesis or returning object
d) Overloading assignment operator and defining copy constructor
Q.9.
How many objects can be returned at once?
a) Only 1
b) Only 2
c) Only 16
d) As many as required
Q.10.
What will be the output of the following code?
Class A
{
int i;
public : A(int n)
{
i=n; cout<<”inside constructor ”;
}
~A()
{
cout<<”destroying ”<<i;
}
void seti(int n)
{
i=n;
}
int geti()
{
return I;
}
};
void t(A ob)
{
cout<<”something ”;
}
int main()
{
A a(1);
t(a);
cout<<”this is i in main ”;
cout<<a.geti();
}
a) inside constructor something destroying 2this is i in main destroying 1
b) inside constructor something this is i in main destroying 1
c) inside constructor something destroying 2this is i in main
d) something destroying 2this is i in main destroying 1
Q.11.
It is necessary to return the object if it was passed by reference to a function.
a) Yes, since the object must be same in caller function
b) Yes, since the caller function needs to reflect the changes
c) No, the changes are made automatically
d) No, the changes are made explicitly
Q.12.
How many objects can be passed to a function simultaneously?
a) Only 1
b) Only an array
c) Only 1 or an array
d) As many as required
Q.13.
If an object is passed by address, will be constructor be called?
a) Yes, to allocate the memory
b) Yes, to initialize the members
c) No, values are copied
d) No, temporary object is created
Q.14.
Is it possible that an object of is passed to a function, and the function also have an object of same name?
a) No, Duplicate declaration is not allowed
b) No, 2 objects will be created
c) Yes, Scopes are different
d) Yes, life span is different
Q.15.
Passing an object using copy constructor and pass by value are same.
a) True
b) False
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