Kotlin Inheritance Quiz

Welcome to the quiz on Kotlin Inheritance and Subclassing! This quiz will test your understanding of how inheritance works in Kotlin, including concepts like subclassing, the open keyword, method overriding, and the use of constructors in parent and child classes. By taking this quiz, you will reinforce your knowledge of creating class hierarchies and extending classes to add new functionality.

What is single inheritance in Kotlin?

A class inheriting from multiple parent classes.

A class inheriting from a single direct parent class.

A method that overrides another method.

A class that cannot be inherited.

None

What is the benefit of using a secondary constructor in a subclass?

It prevents subclassing.

It simplifies method overloading.

It allows for multiple inheritance.

It allows additional properties to be initialized.

None

How do you override a method in Kotlin?

use the ‘override’ keyword

declare the method as ‘open’

use the ‘extends’ keyword

prefix the method with ‘super’

None

Why is the 'open' keyword required before a function to allow it to be overridden?

To allow other classes to modify the function.

To prevent the function from being inherited.

To indicate that the function is private.

To allow the function to be overridden in subclasses.

None

What keyword is used in Kotlin to allow a class to be subclassed?

extend

super

inherit

open

None

What happens if you try to override a method that is not declared as 'open' in the parent class?

The code will compile, but the method will not be overridden.

The code will not compile.

The method will be overridden without issues.

A runtime error will occur.

None

Which method in a subclass allows calling a method with the same name from the parent class?

parent.methodName()

override.methodName()

super.methodName()

this.methodName()

None

Which of the following correctly defines a subclass in Kotlin?

subclass SubClass : ParentClass() { }

class SubClass : ParentClass() { }

class SubClass() { }

class SubClass extends ParentClass() { }

None

Why might you want to override a method in a subclass?

To restrict access to the method.

To create a new method with the same name.

To prevent the method from being inherited.

To provide a different implementation for the method.

None

10.

What is a class hierarchy?

A collection of interfaces.

A set of classes with the same name.

A relationship where classes are derived from one another.

A structure where classes are unrelated.

None

11.

What must be included in the subclass if the parent class has a secondary constructor?

A function call to the ‘init’ block.

A primary constructor in the subclass.

An abstract method.

A secondary constructor with the same parameters.

None

12.

What is the term for a class from which a subclass is derived?

Super class

Child class

Derived class

Root class

None

13.

Which of the following correctly creates a secondary constructor in a subclass?

constructor(number: Int) : super(number)

secondary constructor()

open constructor(number: Int)

constructor() { }

None

14.

What is required when creating a subclass that has a constructor with parameters?

You must provide default values.

You must call the parent’s constructor using ‘super’.

You must initialize the parent class using ‘this’.

You must make the subclass ‘open’.

None

15.

How do you call a superclass method from an overridden method in Kotlin?

methodName()

parent.methodName()

super.methodName()

this.methodName()

None

16.

Which keyword is used to access the parent class's properties or methods in Kotlin?

parent

super

this

base

None

17.

What is the difference between 'open' and 'override' in Kotlin?

‘open’ allows inheritance, ‘override’ modifies inherited methods.

‘open’ marks a method as final, ‘override’ marks it as abstract.

‘open’ is used for methods, ‘override’ for classes.

‘open’ and ‘override’ have the same function.

None

18.

Which of the following is true about the 'super' keyword in Kotlin?

It is used to access methods and properties from a subclass.

It must be used in every subclass method.

It is used to access methods and properties from a parent class.

It can only be used in constructors.

None

19.

What is the base class from which all classes in Kotlin are ultimately derived?

Base

Any

Object

Super

None

20.

What is the purpose of subclassing?

To prevent classes from being inherited.

To limit access to class members.

To create a class without any methods.

To extend the functionality of a parent class.

None

21.

What is inheritance in Kotlin?

A method that has the same name but different parameters.

Creating new classes without any relation.

A class that inherits characteristics from another class.

A way to create unrelated class hierarchies.

None