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Oops MCQ's

Which was the first purely object oriented programming language developed?

S OOPs

Java

C++

SmallTalk

Explanation

 SmallTalk was the first programming language developed which was purely object oriented. It was developed by Alan Kay. OOP concept came into the picture in 1970's.

Kotlin

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Which of the following best defines a class?

S OOPs

Parent of an object

Instance of an object

Blueprint of an object

Explanation

 A class is Blueprint of an object which describes/shows all the functions and data that are provided by an object of a specific class. It can't be called as parent or instance of an object. Class in general describes all the properties of an object.

Scope of an object

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Who invented OOP?

S OOPs

Alan Kay

Explanation

 Alan Kay invented OOP, Andrea Ferro was a part of SmallTalk Development. Dennis invented C++ and Adele Goldberg was in team to develop SmallTalk but Alan actually had got rewarded for OOP.

Andrea Ferro

Dennis Ritchie

Adele Goldberg

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What is the additional feature in classes that was not in structures?

S OOPs

Data members

Member functions

Explanation

 Member functions are allowed inside a class but were not present in structure concept. Data members, static data and public access specifiers were present in structures too.

Static data allowed

Public access specifier

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Which is not feature of OOP in general definitions?

S OOPs

Code reusability

Modularity

Duplicate/Redundant data

Explanation

 Duplicate/Redundant data is dependent on programmer and hence can't be guaranteed by OOP. Code reusability is done using inheritance. Modularity is supported by using different code files and classes. Codes are more efficient because of features of OOP.

Efficient Code

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Pure OOP can be implemented without using class in a program. (True or False)

S OOPs

True

False

Explanation

 It's false because for a program to be pure OOP, everything must be written inside classes. If this rule is violated, the program can't be labelled as purely OO.

Duplicate/Redundant data

Efficient Code

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Which Feature of OOP illustrated the code reusability?

S OOPs

Polymorphism

Abstraction

Encapsulation

Inheritance

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Which language does not support all 4 types of inheritance?

S OOPs

C++

Java

Explanation

 Java doesn't support all 4 types of inheritance. It doesn't support multiple inheritance. But the multiple inheritance can be implemented using interfaces in Java.

Kotlin

Small Talk

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How many classes can be defined in a single program?

S OOPs

Only 1

Only 100

Only 999

As many as you want

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Why Java is Partially OOP language?

S OOPs

It supports usual declaration of primitive data types

Explanation

 As Java supports usual declaration of data variables, it is partial implementation of OOP. Because according to rules of OOP, object constructors must be used, even for declaration of variables.

It doesn't support all types of inheritance

It allows code to be written outside classes

It does not support pointers

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