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Classes and Object-Oriented TypeScript Practice Test 2026 |

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Q1Domain Verified
In TypeScript, when a class inherits from another class using `extends`, what is the primary mechanism by which the child class can access members (properties and methods) of the parent class, assuming they are not `private`?
Using the `super` keyword to explicitly call parent class methods and then assigning to `this`.
The child class must re-declare all inherited members with the `inherited` keywor
D) The child class can only access parent members if they are explicitly marked with the `public` access modifier.
The child class automatically inherits all public and protected members without any explicit action.
Q2Domain Verified
Consider a TypeScript class `Vehicle` with a `protected` method `startEngine()`. If a `Car` class `extends Vehicle`, what is the correct way for `Car` to invoke `startEngine()` from within one of its own methods, assuming `Car` has its own constructor that calls the parent constructor?
`super.startEngine();`
`Car.startEngine();`
`this.startEngine();`
`Vehicle.startEngine();`
Q3Domain Verified
You have a TypeScript class `Shape` with an abstract method `calculateArea()`. A concrete class `Circle` `extends Shape`. What is a fundamental requirement for the `Circle` class to be instantiable?
`Circle` must have a `static` method named `calculateArea()`.
`Circle` must implement `calculateArea()` using the `implements` keyword.
`Circle` must also be declared as `abstract`.
`Circle` must provide a concrete implementation of the `calculateArea()` abstract method.

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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

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