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Which tool is commonly used for executing unit tests in Angular applications?

  • Karma
  • Protractor
  • TypeScript
  • Webpack
The commonly used tool for executing unit tests in Angular applications is Karma. Karma is a test runner that is often used with Angular for running unit tests.
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The 'canLoad' Route Guard method checks whether a _____ can be loaded lazily.

  • component
  • directive
  • module
  • service
The 'canLoad' Route Guard method checks whether a module can be loaded lazily. It's used to control the lazy loading of feature modules in Angular applications.
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When a subscriber attaches to a cold observable, it gets its own independent execution of the _____.

  • Observable
  • Operator
  • Stream
  • Subscription
When a subscriber attaches to a cold observable, it gets its own independent execution of the Observable. A new instance of the observable's execution is created for each subscriber.
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How can you handle conditional validation for controls within a Form Array in Angular?

  • Define custom validation directives
  • Use a separate Form Array for each condition
  • Use the FormControl's setValidators method
  • Utilize the Validators.compose function
You can handle conditional validation in Angular for controls within a Form Array by using the setValidators method of the FormControl.
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Which Angular CLI command is used to create a new Angular project?

  • ng create project
  • ng generate project
  • ng new
  • ng start project
The command to create a new Angular project using Angular CLI is ng new. It sets up a new Angular project with the necessary files and dependencies.
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Angular Elements are packaged as custom elements, a web standard for defining new HTML elements in a _____.

  • Directive
  • Module
  • Service
  • Shadow DOM
Angular Elements are packaged as custom elements, utilizing the web standard for defining new HTML elements in the Shadow DOM.
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How can you make a route parameter optional in Angular?

  • Add a "?" to the parameter
  • Use a default value
  • Use a wildcard route
  • Use a regex pattern
You can make a route parameter optional in Angular by adding a "?" to the parameter name in the route configuration. This indicates that the parameter is optional, and the route can still be matched without it.
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How can you dynamically add or remove form controls in an Angular form?

  • Use *ngFor Directive
  • Use Angular Material Form
  • Use FormGroup API
  • Use Reactive Forms Module
To dynamically add or remove form controls in an Angular form, you can use the FormGroup API. It allows you to add, remove, or manipulate form controls within a FormGroup dynamically based on user interactions or other criteria.
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In an e-commerce application, you want to fetch product details and customer reviews concurrently, and only update the UI when both pieces of data are available. Which RxJS operator should you use?

  • combineLatest
  • forkJoin
  • mergeMap
  • zip
To fetch data concurrently and update the UI when both are available, you should use the forkJoin operator, which waits for all observables to complete and then emits their last values as an array.
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How can you prevent an expression from being re-evaluated in every change detection cycle while using interpolation in Angular?

  • Use a custom pipe
  • Use ngOnPush change detection strategy
  • Use one-time binding ({{::expression}})
  • Use trackBy with ngFor directive
In Angular, you can prevent an expression from being re-evaluated by using one-time binding ({{::expression}}).
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