Object Oriented Programming Mock Test 6

10%

Question 1 of 10

1. If a function declared as abstract in base class doesn’t have to be defined in derived class then ______

Derived class should be made abstract class

Derived class should not use that function

Derived class must define the function anyhow

Derived class should not derive from that base class

Question 1 of 10

Question 2 of 10

2. If hierarchical inheritance requires to inherit more than one class to single class, which syntax is correct? (A, B, C are class names)

many class A: public B, public C

class A: public B, public C

multiple class A: public B, public C

hierarchical class A: public B, public C

Question 2 of 10

Question 3 of 10

3. If there are 3 classes. Class C is derived from class B and B is derived from A, Which class destructor will be called at last if object of C is destroyed.

All together

Question 3 of 10

Question 4 of 10

4. Which class uses hierarchical inheritance in following code?

class A
{
	int a;
};
class B:class A
{
	int b;
};
class C:class A,class B
{
	int c;
};
class D:class A
{
	int d;
};

Class B, C, D

Class A, B, C

Class A, C, D

Class D, A, B

Question 4 of 10

Question 5 of 10

5. The virtual functions must be declared and defined in _____________ class and overridden in ___________ class.

Base, derived

Base, base

Derived, derived

Derived, base

Question 5 of 10

Question 6 of 10

6. If __________________ inheritance is done continuously, it is similar to tree structure.

Multilevel

Multiple

Hierarchical

Hierarchical and Multiple

Question 6 of 10

Question 7 of 10

7. Which among the following best defines the abstract methods?

Function which may or may not be defined in base class

Function which must be declared in derived class

Functions only declared in base class

Functions declared and defined in base class

Question 7 of 10

Question 8 of 10

8. Which is a must condition for virtual function to achieve runtime polymorphism?

Virtual functions must be accessed using base class object

Virtual function must be accessed using derived class object only

Virtual function must be accessed with direct name

Virtual function must be accessed using pointer or reference

Question 8 of 10

Question 9 of 10

9. If all the classes used parameterized constructors and no default constructor then ___________

Only object of first class can be created, which is first parent

The object of lower level classes can’t be created

Object of lower level classes must call parent class constructors explicitly

Object of lower level classes must define all the default constructors

Question 9 of 10

Question 10 of 10

10. Can abstract classes be used in multilevel inheritance?

Yes, always

No, abstract class doesn’t have constructors

No, never

Yes, only one abstract class

Question 10 of 10