TCS NQT OOPS Quiz- 2

Answer :: (B)

EXPLANATION :

By making at least one member function as pure virtual function.

 Compiler is a check type of reference, not a type of object in polymorphism.

Whenever an object is bound with their functionality at the compile-time, this is known as the compile-time polymorphism. At compile-time, java knows which method to call by checking the method signatures. So this is called compile-time polymorphism or static or early binding.

Data hiding is a method used in object-oriented programming to hide information within computer code. Objects inside code are not private to information which is considered hidden. It presents many advantages for programmers because objects are unable to connect to irrelevant data and hackers are less likely to access data.

Data hiding takes specific parts of the code and then conceals those parts from the objects. The objects are not directly accessible in any data that is hidden. If an object is able to access hidden data, it will return an error, and this is because the object cannot see the data.

Answer :: (A)

EXPLANATION:

Multilevel Inheritance ,Multiple Inheritance and hybrid inheritance are the types of the inheritance which needs the virtual function.

 

Answer :: (C)

EXPLANATION :

Destructor cannot be inherited.

Destructors are not inherited. If a class doesn't define one, the compiler generates one. But if a class has members with destructors, the generated destructor calls destructors for those members before calling the base class  destructor.

Answer ::(C)

EXPLANATION :

Protected Data Members are availaible only in the class hierarchy chain.

Method overloading is a concept of Java in which we can create multiple methods of the same name in the same class, and all methods work in different ways. When more than one method of the same name is created in a Class, this type of method is called Overloaded Method.

Answer :: (D)

EXPLANATION ::

The process of building new classes from existing one is called inheritance.

 

Explanation : Abstraction means displaying only essential information and hiding the details. Data abstraction refers to providing only essential information about the data to the outside world, hiding the background details or implementation. So, here in the given case data abstraction is described.

Answer :: (D)

EXPLANATION :

extends keyword is used to inherit properties from one class into another