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TypeScript Object Oriented Programming Quiz

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Question 1

Which of the following defines a property in a class in TypeScript?

  • property: string;

  • var property = "value";

  • function property() {}

  • this.property: number;

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Question 2

Which access modifier allows a property to be accessed only within the class in which it is defined?

  • public

  • private

  • protected

  • readonly

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Question 3

What happens if you try to modify a property marked as readonly?

  • It throws a runtime error.

  • It throws a compile-time error.

  • It logs a warning to the console.

  • It silently ignores the change.

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Question 4

What is the purpose of a setter in a class?

  • To define a method that performs an action

  • To retrieve the value of a private property.

  • To set or modify the value of a private property.

  • To call a constructor with parameters.

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Question 5

Which of the following is a correct example of a getter method in TypeScript?

  • getProperty { return this.property; }

  • get getProperty() { return this.property; }

  • getter getProperty() { return this.property; }

  • function getProperty() { return this.property; }

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Question 6

What is the key characteristic of an abstract class?

  • It cannot have any methods.

  • It can be instantiated directly.

  • It can have both abstract and non-abstract methods.

  • It must have only abstract methods.

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Question 7

How is an abstract method declared in TypeScript?

  • abstract myMethod() {};

  • abstract myMethod() {}:

  • abstract myMethod(): void;

  • function abstract myMethod() {}

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Question 8

What happens if a class does not implement all properties of an interface it claims to implement?

  • It compiles but logs a warning.

  • It throws a runtime error.

  • It fails to compile.

  • It silently ignores the missing properties.

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Question 9

How do you declare that a class implements multiple interfaces?

  • class MyClass extends Interface1, Interface2 {}

  • class MyClass implements Interface1, Interface2 {}

  • class MyClass inherits Interface1, Interface2 {}

  • class MyClass extends Interface1 implements Interface2 {}

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Question 10

Which of the following is a valid implementation of an interface in a class?

TypeScript 
interface Vehicle {
    speed: number;
    move(): void;
}

class Car implements Vehicle {
    speed: number;
    move() {
        console.log(`The car is moving at ${this.speed} km/h`);
    }
}


  • The class Car correctly implements Vehicle.

  • The class Car is missing the speed property.

  • The class Car is missing the move method.

  • The move method in Car has the wrong return type.

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There are 10 questions to complete.

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