Angular MCQ : Angular Fundamentals : Part 4

(1) What is the @ViewChild decorator used for?

• To add metadata for the children of a view

• The InjectionToken class To get a handle on a DOM node decorated with a ref tag(#ref_id)

• To make custom * directives

(2) An Observable represents what?

• Multiple values now

• Multiple values in the future

• Multiple values now or in the future

(3) Where should you sort and filter data?

• In your component

• In a directive

• In a filter

(3) Where should you sort and filter data?

• In your component

• In a directive

• In a filter

(4) Which decorator lets you inject a service registered with an Injection Token?

• Import

• Inject

• Input

(5) What directive helps you hide functionality you don’t want to be visible before users log in?

• ngHide

• ngShow

• ngIf

• ngAuthenticated

(6) Which decorator lets you inject a service registered with an Injection Token?

• Value comparison

• Deep value comparison

• Immutable comparison

• Mutable comparison

• Identity comparison

(7) Which of these would you use to toggle applying multiple classes to an element?

• Use a class binding

• Use a style binding

• Use ngClass

(8) What is the default token in Angular’s Dependency Injector?

• A string

• A class

• The Token class

(9) Which decorator lets you inject a service registered with an Injection Token?

• Import

• Inject

• Input

(10) Which decorator lets you inject a service registered with an Injection Token?

• Import

• Inject

• Input

 

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Angular MCQ : Angular Fundamentals : Part 3

(1) Which of the following is a limitation of using template based forms?

• You can't validate the values entered into the form fields.

• You can't unit-test your validation logic.

• You can't have multiple validators on a field.

2) Which library contains the Observable class?

• Http

• RxJS

• Core

3) Which of the following is an attribute css selector?

• [selector]

• #selector

• .selector

4) What is the purpose of a mock?

• To allow you to test Http calls

• To place a boundary around tested code

• To allow you to arrange your tests easier

5) What object allows you to create your own tokens?

• The InjectionToken class

• The TransparentToken class

• The Token class

6) Which of the following would you use to display a list of elements in a component template?

• *ngRepeat

• *ngEach

• *ngFor 

7) When is the @Injectable() decorator required on a service?

• Only when it is going to be injected into components

• Only when the service also injects other services

• Only when it is going to be injected into another service

8) What's the best way to add component-specific styles to a component?

• Add the styles to a css file imported by your index.html.

• Reference an external stylesheet from inside your component template html.

• Specify the styles or styleUrls inside the component meta-data config.

9) Which of the following is true about property binding expressions?

• They cannot chain expressions together using semi-colons.

• All of these

• They cannot use the new keyword.

• Assignments using =, +=, etc are not allowed.

10) What is a limitation of multiple slot content projection?

• There is a maximum of three slots.

• The slots must be on the same horizontal.

• The slots cannot exist outside of the parent's DOM tree.

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Angular MCQ : Angular Fundamentals : Part 2

 1) What are decorators used for?

• To give a DOM node additional functionality

• To create sub-components

• To create smaller components

2) What is one advantage of RxJS over Promises?

• They can handle a stream of data instead of just one value.

• They are more performant.

• They are simpler.

3) When bootstrapping an Angular app, how do you specify the main, top-level app component to be used?

• You load the component directly in your index.html file.

• You add the component as a package in your SystemJs config.

• You add the component to the bootstrap array in your main app module.

4) When adding styles to a component's styles property, how do you avoid those styles affecting Html outside of your component?

• You must declare your styles inside the component's template.

• You don't need to do anything, Angular takes care of this for you by default.

• You must namespace your classes so they don't affect things outside your component.

5) What functionality do Angular 1 filters have that is missing from Pipes?

• Sorting & Filtering Data

• Working with Promises

• None of these

6) When would you use the useFactory provider method?

• When you need to parameterize the construction of a service

• When you want multiple instances of a service

• When you are using a custom service.

7) If an object could potentially be shown/hidden frequently, what's the best way to handle its visibility?

• Bind to the [hidden] property of the element.

• Use *ngSwitch to hide the element.

• Use *ngIf to hide the element.

8) Custom validators are implemented with which object?

• A Detective

• A Pipe

• A Component

9) What are the two types of Integrated tests?

• Mocked & Functional

• Deep & Shallow

• Deep & End to End

10) When validating an Angular form, how can you only show a validation message if the user has edited a form control?

• Check the control's touched property.

• Check the control's dirty property.

• Bind to the "change" event of the corresponding field and track whether the field has been changed.

• • << Angular Fundamentals part-1      Angular Fundamentals part-3 >>

Angular MCQ - Angular Fundamentals : Part 1

(1) What object allows you to create your own tokens?

• The Token class

• The InjectionToken class

• The TransparentToken class

(2) What does AOT stand for?

• Assertion of Test

• Android Operating Types

• Ahead of Time

(3) What is the best way to prevent a component from being loaded based on specific conditions?

• Check the condition in the component's constructor.

• Create a route guard and use the "canActivate" property of the component's route.

• Create a route resolver and use the "resolve" property of the component's route.

(4) A promise represents what?

• A single value in the future

• Multiple values in the future

• A single value in the present

(5) What is one way you can pass data from a child component to a parent component?

• You import the parent component into the child component.

• You add an @Input() property on the parent component and bind to it from the child component.

• You add an @Output() property on the child component and bind to it from the parent component.

(6) What does AAA stand for?

• Arrange Act Assert

• Act Arrange Assess

• Act Arrange Assert

(7) What is the main purpose of content projection? 

• Create reusable components with replaceable content

• Allow content to be shown in an overlay

• Improve performance

(8) Which of the following is a valid *ngFor expression?

• event of events

• let event in events

• let event of events

(9) Why does angular not ship with a filterBy or orderBy pipe?

• Those features are implemented in other pieces of the framework.

• To keep the download size small

• They can become performance issues.

(10) How do you inject a service into a component, directive, pipe, or another service?

• Import it and specify it as a parameter in the constructor decorated with the Inject() decorator.

• Import it and decorate the import with an Inject() decorator.

• Import it and specify it as a parameter in the constructor decorated with the Inject() decorator.

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• You chose: correct choi

• Angular Fundamentals part-2 >>