Angular MCQ Questions with answers and solutions Page 7

Q. Which Angular feature allows form fields to be added or removed dynamically?

(A) FormControl
(B) FormGroup
(C) FormArray
(D) FormBuilder

💬 Discuss

✅ Correct Answer: (C) FormArray

Explanation: FormArray is used to manage a dynamic list of form controls.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. Which lifecycle hook is called after the component’s view has been fully initialized?

(A) ngAfterViewInit
(B) ngAfterContentInit
(C) ngOnInit
(D) ngDoCheck

💬 Discuss

✅ Correct Answer: (A) ngAfterViewInit

Explanation: ngAfterViewInit is called once the component's view is fully initialized.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. Which Angular version introduced Standalone Components?

(A) Angular 10
(B) Angular 13
(C) Angular 14
(D) Angular 15

💬 Discuss

✅ Correct Answer: (C) Angular 14

Explanation: Standalone components were introduced in Angular 14.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. What is the default scope of Angular services provided in a component?

(A) Application-wide
(B) Module-wide
(C) Component-only
(D) Global

💬 Discuss

✅ Correct Answer: (C) Component-only

Explanation: If provided in a component, the service is scoped to that component and its children.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. What is the purpose of 'providedIn: root' in a service?

(A) To limit the service to a module
(B) To make the service available application-wide
(C) To disable service injection
(D) To provide service only in root component

💬 Discuss

✅ Correct Answer: (B) To make the service available application-wide

Explanation: ‘providedIn: root’ registers the service in the root injector.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. How do you bind a CSS class conditionally in Angular?

(A) [class.active]='isActive'
(B) class='isActive ? active : inactive'
(C) [active]='isActive'
(D) *ngClass='isActive'

💬 Discuss

✅ Correct Answer: (A) [class.active]='isActive'

Explanation: This syntax binds the `active` class based on the boolean value of `isActive`.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. What is the main purpose of ChangeDetectorRef in Angular?

(A) To inject services
(B) To detect route changes
(C) To trigger manual change detection
(D) To initialize a form

💬 Discuss

✅ Correct Answer: (C) To trigger manual change detection

Explanation: ChangeDetectorRef allows you to trigger change detection manually.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. What happens when a component is destroyed in Angular?

(A) View is hidden but logic continues
(B) ngOnDestroy is called and subscriptions should be cleaned up
(C) Nothing happens by default
(D) Only the DOM is cleared

💬 Discuss

✅ Correct Answer: (B) ngOnDestroy is called and subscriptions should be cleaned up

Explanation: ngOnDestroy is the hook where cleanup tasks like unsubscribing are done.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. How can you prevent memory leaks in Angular when using Observables?

(A) Using setInterval
(B) Using HttpClient
(C) Unsubscribing in ngOnDestroy
(D) Calling next() manually

💬 Discuss

✅ Correct Answer: (C) Unsubscribing in ngOnDestroy

Explanation: Always unsubscribe from Observables to avoid memory leaks.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Q. Which decorator is used to pass data from parent to child component?

(A) @Inject
(B) @Input
(C) @Output
(D) @HostListener

💬 Discuss

✅ Correct Answer: (B) @Input

Explanation: @Input is used to receive data from a parent component.

Published by Mr. Dubey ⭐ 111.54K Points at 08-Jun-2025 11:45 am in Angular

Angular MCQs with answers Page - 7

Q. Which Angular feature allows form fields to be added or removed dynamically?

Q. Which lifecycle hook is called after the component’s view has been fully initialized?

Q. Which Angular version introduced Standalone Components?

Q. What is the default scope of Angular services provided in a component?

Q. What is the purpose of 'providedIn: root' in a service?

Q. How do you bind a CSS class conditionally in Angular?

Q. What is the main purpose of ChangeDetectorRef in Angular?

Q. What happens when a component is destroyed in Angular?

Q. How can you prevent memory leaks in Angular when using Observables?

Q. Which decorator is used to pass data from parent to child component?

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