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Object-Oriented-Programming(OOPS)

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Question 1

What is the purpose of the constructor() method in a JavaScript class?


  • To define class methods

  • To initialize properties when an object is created

  • To handle inheritance

  • To call the parent class constructor

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Question 2

Which of the following is used to declare a class in JavaScript?

  • function ClassName {}



  • class ClassName {}

  • var ClassName = {}

  • object ClassName {}

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Question 3

What is the output of the following code?

JavaScript 
class Person {
    constructor(name) { this.name = name; }
    greet() { console.log(`Hi, I am ${this.name}`); }
}
new Person('Alice').greet();


  • Hi, I am Alice

  • Hello, Alice

  • Hi

  • undefined

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Question 4

What is inheritance in JavaScript?

  • Sharing methods between classes

  • Adding methods to an existing class

  • Extending functionality of another class

  • Making methods private

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Question 5

What will the following code output?

JavaScript 
class Animal {
    speak() { console.log("Animal speaks"); }
}
class Dog extends Animal {
    speak() { console.log("Dog barks"); }
}
new Dog().speak();


  • Animal speaks

  • Dog barks

  • undefined

  • Error

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Question 6

What keyword is used to call the constructor of the parent class?

  • this()

  • super()

  • parent()

  • base()

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Question 7

Which of the following is NOT a feature of JavaScript classes?

  • Encapsulation

  • Inheritance

  • Function Overloading

  •  Constructor Method

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Question 8

What is the output of the following code?

JavaScript 
class Student {
    constructor(name, grade) { this.name = name; this.grade = grade; }
    intro() { console.log(`I'm ${this.name} in grade ${this.grade}`); }
}
new Student('Mike', 10).intro();


  • I'm Mike in grade 10

  • undefined

  • I'm Mike


  • Mike in grade 10

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Question 9

What is Abstraction?

  • Hiding complexity, showing only essential parts

  • Creating multiple objects

  • Inheriting properties

  • Encapsulating data

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Question 10

What concept is demonstrated in this code?

JavaScript 
class Vehicle {
    drive() { console.log('Driving vehicle'); }
}
class Car extends Vehicle {
    drive() { console.log('Driving car'); }
}


  • Abstraction

  • Polymorphism

  • Encapsulation

  • Inheritance

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There are 10 questions to complete.

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