Object Oriented Programming (OOP) MCQs (Chapterwise Multiple Choice Questions)

What is a method?

A set of instructions designed to perform a frequently used operation within a program and return no values

The exact same thing as a function and subroutine

A set of variables that can change over time

A procedure associated with data and behaviour

Answer & Explanation

Correct Answer: The exact same thing as a function and subroutine

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In context of OOP, what is association?

Association is a relationship where all objects have their own life cycle and there is no owner.

Association is the process where model elements cooperate to provide higher-level behavior.

Association is whole/part relationship where one object is composed of one or more other objects, each of which is considered a part of the whole.

Association is where all objects have their own life cycle, but there is ownerhip, and child objects can not belong to another parent object.

Answer & Explanation

Correct Answer: Association is a relationship where all objects have their own life cycle and there is no owner.

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What are the five Creational Design patterns by the Gang of Four ?

Observer, State, Strategy, Template Method, and Visitor.

Composite, Visitor, State, Prototype, and Singleton.

Composite, Builder, Factory Method, Prototype, and Singleton.

Abstract Factory, Builder, Factory Method, Prototype, and Singleton.

Answer & Explanation

Correct Answer: Abstract Factory, Builder, Factory Method, Prototype, and Singleton.

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When does static binding happen?

Only when you export

Both at compile time and runtime

At compile time

At runtime

Answer & Explanation

Correct Answer: At compile time

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What is a reference to an object?

It is the address of variable only -- not the method of an object.

It is a shallow pointer that contains address of an object.

It is the physical address of an object.

It is the address where the variables and methods of an object are stored.

Answer & Explanation

Correct Answer: It is the address where the variables and methods of an object are stored.

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What is an IS-A relationship?

It implies encapsulation.

A superclass object has an IS-A relationship with its subclass.

It implies a virtual method.

A subclass object has an IS-A relationship with its superclass or interface

Answer & Explanation

Correct Answer: A subclass object has an IS-A relationship with its superclass or interface

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Methods and attributes that define an object are a kind of blueprint called what?

A collection

A variable

A class

A procedure

Answer & Explanation

Correct Answer: A class

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How do object behaviour and attributes differ?

Behaviour describe dynamic properties; attributes are static.

Attributes describe a state; behaviours describe a change.

Attributes apply only to a specified object; behaviour apply to other linked objects.

Behaviours are vector quantities; attributes are scalars.

Answer & Explanation

Correct Answer: Attributes describe a state; behaviours describe a change.

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The open/closed principle states that classes should be open for _ but closed for _.

Refactoring; duplication

Modification; duplication

Extension; modification

Reuse; encapsulation

Answer & Explanation

Correct Answer: Extension; modification

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What is the main idea behind separation of concerns?

All of these answers

Applications are decomposed into parts

Parts are defined with minimal overlap

Each part is responsible for a separate concern

Answer & Explanation

Correct Answer: All of these answers

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MCQ on OOP (Object-oriented programming)	MCQ on OOP Placement Practice
MCQ on Object Class	General Object Oriented Programming (OOP) MCQs