Quiz on OOPs- Day 1 (30-01-2025)

Which one of the following are essential features of an object-oriented programming language?

• Abstraction and encapsulation

• Strictly-typedness

• Polymorphism in the presence of inheritance

• Type-safe property coupled with sub-type rule

Which of the following languages supports polymorphism but not the classes?

• Ada

• C++

• C#

• Java

What will be the output of the following program fragment?

Class P { void f(int i) { print(i); } } Class Q subclass of P { void f(int i) { print(2*i); } }

P x = new Q(); Q y = new Q(); P z = new Q(); x.f(1); ((P)y).f(1); z.f(1);

• 1 2 2

• 1 1 1

• 2 2 2

• 1 2 1

Which feature of OOP indicates code reusability?

• Polymorphism

• Inheritance

• Encapsulation

• Abstraction

Which one of the following are essential features of object-oriented language?

• Polymorphism in the presence of inheritance

• Type-safe property coupled with sub-type rule

• Strictly-typed

• Abstraction and encapsulation

Which of the following is associated with objects?

• Identity

• Behaviour

• State

• All of the above

What can you say about the following two statements regarding abstraction and encapsulation?

I. Abstraction allows us to focus on what something does without considering the complexities of how it works. II. Encapsulation allows us to consider complex ideas while ignoring irrelevant detail that would confuse us.

• Only I is correct.

• Only II is correct.

• Both I and II are correct.

• Neither I nor II is correct.

Consider the following two statements: (a) A publicly derived class is a subtype of its base class. (b) Inheritance provides for code reuse.

• Both the statements (a) and (b) are correct.

• Neither of the statements (a) and (b) are correct.

• Statement (a) is incorrect and (b) is correct.

• Statement (a) is correct and (b) is incorrect.

Which of the following is NOT a fundamental concept of Object-Oriented Programming (OOP)?

• Abstraction

• Encapsulation

• Recursion

• Inheritance

The feature in object-oriented programming that allows the same operation to be carried out differently, depending on the object, is:

• Inheritance

• Overriding

• Polymorphism

• Overfunctioning