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Angular 2 Quiz | Information
| Quiz Name | Angular 2 Quiz |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Angular 2 MCQ & Online Quiz – Practice
1. What is Angular 2?
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a) A library for building user interfaces
b) A framework for building dynamic web applications
c) A server-side rendering engine
d) A database management system
Answer: b) A framework for building dynamic web applications
Explanation: Angular 2 is a JavaScript framework used for building dynamic web applications. It is an open-source framework developed and maintained by Google. It allows developers to create powerful and scalable applications with ease.
2. Which of the following is NOT a building block of Angular 2?
a) Components
b) Services
c) Pipes
d) Modules
Answer: c) Pipes
Explanation: Pipes are actually a feature of Angular 2 used for data transformation. The building blocks of Angular 2 are components, services, and modules.
3. What is the purpose of the AppModule in Angular 2?
a) To define the root component of the application
b) To define the services used by the application
c) To define the components used by the application
d) To define the routing configuration of the application
Answer: a) To define the root component of the application
Explanation: AppModule is the root module of an Angular 2 application. It is responsible for defining the root component of the application and importing all the required modules and services.
4. What is two-way data binding in Angular 2?
a) A feature that allows data to be passed from parent components to child components
b) A feature that allows data to be passed from child components to parent components
c) A feature that allows data to be bound to both the view and the component
d) A feature that allows data to be bound to the view only
Answer: c) A feature that allows data to be bound to both the view and the component
Explanation: Two-way data binding in Angular 2 is a feature that allows data to be bound to both the view and the component. This means that changes made to the data in either the view or the component will be automatically updated in the other.
5. What is the purpose of the OnInit interface in Angular 2?
a) To provide a hook for initializing a component
b) To provide a hook for destroying a component
c) To provide a hook for updating a component
d) To provide a hook for rendering a component
Answer: a) To provide a hook for initializing a component
Explanation: The OnInit interface in Angular 2 is used to provide a hook for initializing a component. The ngOnInit() method is called once the component has been initialized and can be used to perform any necessary initialization tasks.
6. Which of the following is NOT a lifecycle hook in Angular 2?
a) ngOnChanges
b) ngOnInit
c) ngAfterViewInit
d) ngRender
Answer: d) ngRender
Explanation: ngRender is not a lifecycle hook in Angular 2. The correct lifecycle hooks are ngOnChanges, ngOnInit, ngAfterViewInit, etc.
7. hat is dependency injection in Angular 2?
a) A feature that allows components to inject services they depend on
b) A feature that allows components to inject other components they depend on
c) A feature that allows modules to inject services they depend on
d) A feature that allows modules to inject other modules they depend on
Answer: a) A feature that allows components to inject services they depend on
Explanation: Dependency injection in Angular 2 is a feature that allows components to inject services they depend on. This helps to reduce the complexity of an application by separating concerns and allowing components to focus on their specific tasks.
8. What is the purpose of the router module in Angular 2?
a) To define the root component of the application
b) To define the services used by the application
c) To define the components used by the application
d) To define the routing configuration of the application
Answer: d) To define the routing configuration of the application
Explanation: The router module in Angular 2 is used to define the routing configuration of the application. It allows developers to define routes and their associated components, and to navigate between them.
9. What is the difference between ngOnInit and ngAfterViewInit in Angular 2?
a) ngOnInit is called before ngAfterViewInit
b) ngAfterViewInit is called before ngOnInit
c) ngOnInit is called only once during the lifecycle of a component, while ngAfterViewInit is called every time the view of a component is initialized
d) ngOnInit is called every time the view of a component is initialized, while ngAfterViewInit is called only once during the lifecycle of a component
Answer: c) ngOnInit is called only once during the lifecycle of a component, while ngAfterViewInit is called every time the view of a component is initialized
Explanation: ngOnInit is called only once during the lifecycle of a component, after the first ngOnChanges hook is called. It is used to perform any necessary initialization tasks. ngAfterViewInit, on the other hand, is called every time the view of a component is initialized or updated. It is used to perform any tasks that require the view to be fully initialized.
10. Which of the following is NOT a valid property binding syntax in Angular 2?
a) [property]=”value”
b) [class.property]=”value”
c) [style.property]=”value”
d) {{property}}
Answer: d) {{property}}
Explanation: {{property}} is not a valid property binding syntax in Angular 2. The correct syntax is [property]=”value”, [class.property]=”value”, or [style.property]=”value”.
11. What is the purpose of the NgZone service in Angular 2?
a) To provide a way to handle errors in an Angular 2 application
b) To provide a way to track changes to an Angular 2 application
c) To provide a way to optimize performance in an Angular 2 application
d) To provide a way to manage the asynchronous nature of an Angular 2 application
Answer: d) To provide a way to manage the asynchronous nature of an Angular 2 application
Explanation: The NgZone service in Angular 2 is used to manage the asynchronous nature of an application. It provides a way to detect and handle changes made to the application and to manage the change detection process.
12. Which of the following is NOT a valid event binding syntax in Angular 2?
a) (event)=”handler()”
b) on-event=”handler()”
c) (event)=”expression”
d) on-event=”{{expression}}”
Answer: b) on-event=”handler()”
Explanation: on-event=”handler()” is not a valid event binding syntax in Angular 2. The correct syntax is (event)=”handler()”, (event)=”expression”, or (event)=”handler($event)”.
13. What is the purpose of the async pipe in Angular 2?
a) To provide a way to handle asynchronous data in an Angular 2 application
b) To provide a way to handle errors in an Angular 2 application
c) To provide a way to handle user input in an Angular 2 application
d) To provide a way to handle user authentication in an Angular 2 application
Answer: a) To provide a way to handle asynchronous data in an Angular 2 application
Explanation: The async pipe in Angular 2 is used to handle asynchronous data in an application. It provides a way to subscribe to an observable and automatically update the view when new data is available.
14. What is the purpose of the ngFor directive in Angular 2?
a) To define a component in Angular 2
b) To define a template in Angular 2
c) To iterate over a collection of items and render a template for each item
d) To define a routing configuration in Angular 2
Answer: c) To iterate over a collection of items and render a template for each item
Explanation: The ngFor directive in Angular 2 is used to iterate over a collection of items and render a template for each item. It is often used in conjunction with an array or an observable to display a list of items.
15. Which of the following is NOT a valid way to create a new Angular 2 project using the Angular CLI?
a) ng new my-app
b) ng init my-app
c) ng generate application my-app
d) npx -p @angular/cli ng new my-app
Answer: b) ng init my-app
Explanation: ng init my-app is not a valid way to create a new Angular 2 project using the Angular CLI. The correct ways are ng new my-app, ng generate application my-app, or npx -p @angular/cli ng new my-app.
16. Which of the following is NOT a valid lifecycle hook in Angular 2?
a) ngOnInit
b) ngAfterViewInit
c) ngOnChanges
d) ngViewCreated
Answer: d) ngViewCreated
Explanation: ngViewCreated is not a valid lifecycle hook in Angular 2. The correct hook is ngAfterViewInit, which is called after the view of a component is initialized.
17. What is the purpose of the ngClass directive in Angular 2?
a) To define a component in Angular 2
b) To define a template in Angular 2
c) To dynamically add or remove CSS classes from an element based on a condition
d) To define a routing configuration in Angular 2
Answer: c) To dynamically add or remove CSS classes from an element based on a condition
Explanation: The ngClass directive in Angular 2 is used to dynamically add or remove CSS classes from an element based on a condition. It is often used to apply conditional styling to an element.
18. Which of the following is NOT a valid way to create a custom directive in Angular 2?
a) Using the @Directive decorator
b) Using the @Component decorator
c) Using the Directive class
d) Using the ElementRef class
Answer: b) Using the @Component decorator
Explanation: The @Component decorator is used to create a component in Angular 2, not a directive. To create a custom directive, you can use the @Directive decorator, the Directive class, or the ElementRef class.
19. What is the purpose of the ngModel directive in Angular 2?
a) To define a component in Angular 2
b) To define a template in Angular 2
c) To bind a form control to a component property and update the value of the control based on user input
d) To define a routing configuration in Angular 2
Answer: c) To bind a form control to a component property and update the value of the control based on user input
Explanation: The ngModel directive in Angular 2 is used to bind a form control to a component property and update the value of the control based on user input. It is often used in conjunction with the FormsModule to create two-way data binding in a form.
20. Which of the following is NOT a valid type of directive in Angular 2?
a) Component
b) Structural
c) Attribute
d) Service
Answer: d) Service
Explanation: Service is not a valid type of directive in Angular 2. The valid types of directives are Component, Structural, and Attribute
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