Angular MCQ Questions | Interview Quick

1. What method is used to wire up a FormControl to a native DOM input element in reactive forms?

It provides access from within the component class to the ElementRef object for the

tag that has the bio template reference variable in the component's template view.

It indicates that the

tag be rendered as a child of the parent view that uses this component.

It makes the

tag in the template support content projection.

It makes the

tag visible in the final render. If the #bio was used in the template and the @ViewChild was not used in the class

then Angular would automatically hide the

tag that has #bio on it.

2. What is the difference between the paramMap and the queryParamMap on the ActivatedRoute class?

Add the string name given to the FormControl to an attribute named controls on the element to indicate what fields it should include.

Use the square bracket binding syntax around the value attribute on the DOM element and set that equal to an instance of the FormControl.

Use the formControlName directive and set the value equal to the string name given to the FormControl.

Use the string name given to the FormControl as the value for the DOM element id attribute.

3. What is the RouterModule.forRoot method used for?

The paramMap is an object literal of the parameters in a route's URL path. The queryParamMap is an Observable of those same parameters.

The paramMap is an Observable that contains the parameter values that are part of a route's URL path. The queryParamMap is a method that takes in an array of keys and is used to find specific parameters in the paramMap.

paramMap is the legacy name from Angular 3. The new name is queryParamMap.

Both are Observables containing values from the requested route's URL string. The paramMap contains the parameter values that are in the URL path and the queryParamMap contains the URL query parameters.

4. What is the correct template syntax for using the built-in ngFor structural directive to render out a list of productNames?

None. The async pipe does not subscribe automatically.

None. The template syntax is not correct.

Three. There is one for each async pipe.

One. The async pipe caches Observables by type internally.

5. What are the two component decorator metadata properties used to set up CSS styles for a component?

this.httpClient.url(this.orderUrl).post(order);

this.httpClient.send(this.orderUrl

order);

this.httpClient.post(this.orderUrl

order);

this.httpClient.post(this.orderUrl

order).subscribe();

6. . What is the purpose of the valueChanges method on a FormControl?

Registering any providers that you intend to use in routed components.

Registering route definitions at the root application level.

Indicating that Angular should cheer on your routes to be successful.

Declaring that you intend to use routing only at the root level.

7. . What directive is used to link an tag to routing?

Any element with the attribute app-user-card

such as

.

The first instance of .

All instances of .

Angular MCQ With Answers

Angular Interview Questions for Freshers

Angular MCQ

1. What method is used to wire up a FormControl to a native DOM input element in reactive forms?

2. What is the difference between the paramMap and the queryParamMap on the ActivatedRoute class?

3. What is the RouterModule.forRoot method used for?

4. What is the correct template syntax for using the built-in ngFor structural directive to render out a list of productNames?

5. What are the two component decorator metadata properties used to set up CSS styles for a component?

6. . What is the purpose of the valueChanges method on a FormControl?

7. . What directive is used to link an tag to routing?

8. . You want to see what files would be generated by creating a new contact-card component. Which command would you use?

9. . What are Angular lifecycle hooks?

10. . How would you configure a route definition for a UserDetailComponent that supports the URL path user/23 (where 23 represents the id of the requested user)?

11. In order for Angular to process components in an application, where do the component types need to be registered?

12. When a service is provided for root and is also added to the provider's configuration for a lazy-loaded module, what instance of that service does the injector provide to constructors in the lazy-loaded module?

13. In reactive forms, what Angular form class type is used on the native DOM element to wire it up?

14. How does the emulated view encapsulation mode handle CSS for a component?

15. When a service requires some setup to initialize its default state through a method, how can you make sure that said method is invoked before the service gets injected anywhere?

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16. What is the primary difference between a component and a directive?

17. What lifecycle hook can be used on a component to monitor all changes to @Input values on that component?

18. Which Angular CLI command would you run to generate a UsersComponent and add it to the SharedModule (in file shared.module.ts in your application)?

19. What Angular utilities, if any, are required to unit test a service with no constructor dependencies?

20. What is the difference between the CanActivate and the CanLoad route guards?

Angular MCQ With Answers

Angular Interview Questions for Freshers

Angular MCQ

1. What method is used to wire up a FormControl to a native DOM input element in reactive forms?

2. What is the difference between the paramMap and the queryParamMap on the ActivatedRoute class?

3. What is the RouterModule.forRoot method used for?

4. What is the correct template syntax for using the built-in ngFor structural directive to render out a list of productNames?

5. What are the two component decorator metadata properties used to set up CSS styles for a component?

6. . What is the purpose of the valueChanges method on a FormControl?

7. . What directive is used to link an tag to routing?

8. . You want to see what files would be generated by creating a new contact-card component. Which command would you use?

9. . What are Angular lifecycle hooks?

10. . How would you configure a route definition for a UserDetailComponent that supports the URL path user/23 (where 23 represents the id of the requested user)?

11. In order for Angular to process components in an application, where do the component types need to be registered?

12. When a service is provided for root and is also added to the provider's configuration for a lazy-loaded module, what instance of that service does the injector provide to constructors in the lazy-loaded module?

13. In reactive forms, what Angular form class type is used on the native DOM element to wire it up?

14. How does the emulated view encapsulation mode handle CSS for a component?

15. When a service requires some setup to initialize its default state through a method, how can you make sure that said method is invoked before the service gets injected anywhere?

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{{ titleText }}

{{ titleText }}

16. What is the primary difference between a component and a directive?

17. What lifecycle hook can be used on a component to monitor all changes to @Input values on that component?

18. Which Angular CLI command would you run to generate a UsersComponent and add it to the SharedModule (in file shared.module.ts in your application)?

19. What Angular utilities, if any, are required to unit test a service with no constructor dependencies?

20. What is the difference between the CanActivate and the CanLoad route guards?

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