Angular

Question 1

npm uses the package.json to manage what dependencies our application has.

Answer 1

true

Question 2

By default, event handlers are set to the bubbling phase.

Answer 2

true

Question 3

This function of the XMLHttpRequest object sends the request to the server?

Answer 3

send

Question 4

This object is used to make Ajax calls.

Answer 4

XMLHttpRequest

Question 5

Which will submit a form using JavaScript?

Answer 5

document.getElementById(‘myform’).submit( )

Question 6

What is === operator?

Answer 6

Compares value equality as well as data type

Question 7

How can you add new DIV elements dynamically?

Answer 7

document.createElement(‘div’)

Question 8

Which is not a JavaScript data type?

Answer 8

Undeclared

Question 9

What is the correct JavaScript syntax to change the content of the HTML element?

Answer 9

document.getElementById(“demo”).innerHTML = “Hello World!”;

Question 10

The HTML DOM is an object based interface that allows JavaScript and other entities manipulate and create HTML elements dynamically.

Answer 10

true

Question 11

You are allowed to have more than one script tag on the page for multiple JavaScript references.

Answer 11

true

Question 12

Which method is best to use if you want to grab all paragraphs on the page?

Answer 12

getElementsByTagName()

Question 13

The number -1000, is considered truthy

Answer 13

TRUE

Question 14

Angular 2 supports TypeScript.

Answer 14

TypeScript is one of the main drivers behind Angular 2 because of the support for constructs such as Decorators.

Question 15

True or False. The AppComponent is typically the name for an Angular 2 application’s root component.

Answer 15

The AppComponent is the Component defined in app-component.ts and serves as the main component of the application.

Question 16

Which of the following files provides compilation information for an Angular2 application?

Answer 16

main.ts specifies how to compile the application and specifies the main module.

Question 17

Which of the following files is typically used to link your application’s components?

Answer 17

app-module.ts defines the AppModule component. It is the root module and will link all other components of your application here

Question 18

Data-binding is: (Choose the best option to complete this sentence)

Answer 18

the association of data/events with elements and user interactions

Question 19

Directives are: (Choose the option that best completes this sentence)

Answer 19

elements, attributes and CSS style classes that you bind on your HTML templates

Question 20

True or False. A Component is a specialized Directive.

Answer 20

true

Question 21

A template is a collection of data values you pass to a component.

Answer 21

false

Question 22

Services are: (Choose the best option to complete this sentence)

Answer 22

features or values that you want defined in one location but in general are used throughout your application

Question 23

Interpolation is: (Choose the best option to complete the sentence)

Answer 23

a way to display data from your Angular code on your templates

Question 24

@Component {
    selector: 'my-app',
    template: '<h1>Hello  [interpolation here] </h1>'
}
export class Component AppComponent { 
    name = 'World';
}
Which of the following is the best way to use interpolation to present the name property in the space [interpolation here]?

Answer 24

{{ name }}

Question 25

Which of the following decorators is the one used to specify metadata for the root module?

Answer 25

@NgModule

Question 26

Which properties do you specify on @NgModule? (Choose all that apply)

Answer 26

Explanation : Correct. The three main properties that you specify inside @NgModule are declarations, bootstrap and imports. There are others used for specifying services and other constructs. Definitions, components and services, however, are not valid properties of @NgModule

Question 27

Which of the following are specified as part of the declarations property of @NgModule? (Choose all that apply)

Answer 27

Correct. components, directives and pipes are to be specified as values of the declarations property. services are specified in the providers array and other modules are specified as values for the imports property

Question 28

Which of the following are specified as part of the imports property of @NgModule? (Choose all that apply)

Answer 28

other modules

Question 29

Angular will match the selector property of the root component to an element in index.html during the bootstrapping process

Answer 29

TRUE

Question 30

True or False. If you want to set the value of a property that is NOT a string datatype, then you can use interpolation.

Answer 30

Correct. Interpolation is used only for string-based values. Use property-binding for other datatypes.

Question 31

Which of the following correctly uses property binding:

Answer 31

<img></img>

Question 32

Event-binding associates DOM events to component functions.

Answer 32

TRUE

Question 33

@Directive is used for creating custom directives.

Answer 33

TRUE

Question 34

True of False. ngModel, ngClass, and ngStyle are examples of structural directives.

Answer 34

FALSE

Question 35

True or False. ngIf does NOT remove the element from the DOM if the expression evaluates to false.

Answer 35

FALSE

Question 36

True or False. ngClass is used to add/remove multiple styles using key/value pairs of CSS

Answer 36

FALSE

Question 37

You cannot use a service within another.

Answer 37

FALSE

Question 38

Which of the following best describes what a Route is?

Answer 38

a path and an associated component

Question 39

Which of the following snippets correctly defines a Routes object that associates /path to PageComponent? (Choose the best option)

Answer 39

const routes: Routes = [
{path: ‘path’, component: PageComponent}
];

Question 40

Which method do you call to configure the routes in your application with the module?

Answer 40

RouterModule.forRoot(routes)

Question 41

Which directive is used to specify the location of routable content to display?

Answer 41

RouterOutlet

Question 42

A routerLink can be used to navigate to external URLs or websites outside of the current application.

Answer 42

FALSE

Question 43

A component is an important feature in Angular 2.

Answer 43

Explanation : You’ll find that many constructs in Angular 2 are referred to as Components. There is a special decorator that you’ll have to use, @Component, even when creating a component.

Question 44

Metadata is: (Choose the best option to complete the sentence)

Answer 44

a collection of data values that you pass to a component

Question 45

Modules are used to organize code in features or related functionality in order to prevent code bloat and promote code reuse.

Answer 45

TRUE

Question 46

A Logging Service is a type of feature that may be injected into another class.

Answer 46

TRUE

Question 47

The root module must be named AppModule.

Answer 47

FALSE

Question 48

Two-way Data-binding is like property-binding and event-binding together

Answer 48

TRUE

Question 49

Bootstrapping is the process during which your Root Component is inserted into the DOM.

Answer 49

TRUE

Question 50

myDiv

Given the following snippet:
<h1>Hello {{name}}</h1>
<div>This is a sentence</div>
<p>{{myDiv.innerHTML}}</p>
and 

@Component({
  moduleId: module.id,
  selector: 'my-app',
  templateUrl: './app.component.html'
})
export class AppComponent  { name = 'test'; }

name
myDiv.innerHTML
{{name}}

Answer 50

myDiv