Object Oriented Programming Practice Test 6

1. Is it compulsory to have constructor for all the classes involved in multiple inheritance?

No, they must not contain constructors

Yes, only if no abstract class is involved

No, only classes being used should have a constructor

Yes, always

2. How many abstract classes can be used in multilevel inheritance?

Only 1

At least one less than number of levels

Can’t be used

Only 2

3. Which Class is having highest degree of abstraction in multilevel inheritance of 5 levels?

Class 2nd last level

All with same abstraction

Class at 1st level

Class at 5th level

4. It is ____________________ to define the abstract functions.

Mandatory for all the classes in program

Necessary for all the base classes

Necessary for all the derived classes

Not mandatory for all the derived classes

5. The abstract methods can never be ___________ in a base class.

Public

Private

Protected

Default

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

Derived class should not use that function

Derived class should not derive from that base class

Derived class should be made abstract class

Derived class must define the function anyhow

7. How many base classes can a derived class have which is implementing multiple inheritance?

At least 2

At most 2

As many as required

Only 2

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 using pointer or reference

Virtual function must be accessed with direct name

9. If class A inherits class B and class C as “class A: public class B, public class C {// class body ;}; ”, which class constructor will be called first?

Class C

Class A

Class B

All together

10. In multilevel inheritance one class inherits _______________

As many classes as required

At least one class

Only one class

More than one class