OOPS Concepts MCQs (Chapterwise Multiple Choice Questions)

Why is composition considered a simpler method than inheritance?

Composition has complex namespace clashes.

It isn't considered a simpler method.

Composition lacks the namespace clash, and the complicated inheritance hierarchies.

It is filled with complicated inheritance hierarchies.

Answer & Explanation

Correct Answer: Composition lacks the namespace clash, and the complicated inheritance hierarchies.

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Virtual inheritance is:

where virtually nothing is inherited

the base class is replicated for each derived class

not an OOP term

where only one base class object is created

Answer & Explanation

Correct Answer: where only one base class object is created

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Ref counts are:

magic methods on all classes

how wrestling referees determine a winner

an optimization for compilers

a way of managing object lifetimes

Answer & Explanation

Correct Answer: a way of managing object lifetimes

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If a system is systematically computing “metadata”, what would you use to define that system?

Programming metadata.

Accentuated grammars.

Attribute phonetics.

Attribute grammars.

Answer & Explanation

Correct Answer: Attribute grammars.

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What are classes used for?

Classes describe different features.

Classes are used to manage metadata.

Classes are used to define specific types.

Classes define objects.

Answer & Explanation

Correct Answer: Classes are used to define specific types.

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True or false? Static variables are visible outside of the class

True

False

depends

Answer & Explanation

Correct Answer: depends

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What is the most important trait of a polymorphism?

The difference in interface.

The total differences.

The common interface.

The multiple interfaces.

Answer & Explanation

Correct Answer: The common interface.

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What is a simple way to think of inheritance?

New properties written from scratch.

One object generating another object.

One object writing new properties for another.

One object acquiring the properties of another.

Answer & Explanation

Correct Answer: One object acquiring the properties of another.

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True or false? An interface is another name for a class.

True

False

Answer & Explanation

Correct Answer: False

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True or false? A class can implement one or more interfaces.

False

True

Answer & Explanation

Correct Answer: True

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