Angular MCQs
Q.1 How do you use a pipe in Angular?
A. {{ value | pipeName }}
B. [value | pipeName]
C. {{ value } & pipeName}
D. {{ value: pipeName }}
Q.2 In Angular, what is the primary purpose of the [ ] syntax in templates?
A. To define a variable
B. To bind a property
C. To execute a function
D. To declare an array
Q.3 What is the difference between structural and attribute directives in Angular?
A. Structural directives alter layout, attribute directives alter appearance
B. Structural directives alter behavior, attribute directives alter layout
C. Structural directives add or remove elements, attribute directives change the appearance of elements
D. Structural directives are built-in, attribute directives are custom
Q.4 Which directive is used for two-way data binding in Angular forms?
A. ngModel
B. ngBind
C. ngControl
D. ngForm
Q.5 When encountering the error “Can’t bind to ‘ngModel’ since it isn’t a known property of ‘input'”,
what is the likely cause?
A. The FormsModule is not imported
B. The BrowserModule is not imported
C. The component is not declared in the NgModule
D. The Angular version is outdated
Q.6 What could cause an error if a template variable is undefined in an Angular component’s template?
A. Missing import in the component class
B. Incorrect syntax in the template
C. The variable is not declared in the class
D. The module is not imported
Q.7 If an Angular component’s template displays nothing where dynamic content should be, what might be the problem?
A. The component is not declared in a module
B. The data binding is incorrect
C. The directive is misspelled
D. The service is not connected
Q.8 In an Angular template, what is the purpose of the *ngIf directive?
A. To repeat a section of UI
B. To hide or show a section of UI conditionally
C. To create a reference to an element
D. To apply a CSS class
Q.9 Given the Angular syntax <button (click)=”save()”>Save</button>,
what does (click) represent?
A. A directive
B. A data binding
C. An event binding
D. A property binding
Q.10 What does the following Angular template syntax do:
<p>{{ message }}</p>
A. Displays a static message
B. Binds to a property called ‘message’ in the component
C. Creates a message variable
D. Links to an external message
Q.11 How do you apply a CSS class conditionally to an element in Angular?
A. Using the [class] binding
B. Using the [style] binding
C. Using @Input
D. Using @Output
Q.12 Which Angular feature is used to display data in a component template dynamically?
A. Directives
B. Services
C. Modules
D. Pipes
Q.13 What is the purpose of the @Component decorator in Angular?
A. To define a service
B. To declare a class as an Angular component
C. To configure routing
D. To create a directive
Q.14 In Angular, how do you bind a component’s class property to an element in its template?
A. {{ }}
B. [ ]
C. ( )
D. [( )]
Q.15 Which file extension is used for Angular component templates?
A. .html
B. .css
C. .ts
D. .js
Q.16 What is a component in Angular?
A. A CSS stylesheet
B. A routing configuration
C. A building block of Angular UI
D. A server-side script
Q.17 During project setup, if ng serve fails with the error “Local workspace file (‘angular.json’) could not be found”,
what is the likely issue?
A. The angular.json file is missing or misplaced
B. Incorrect Angular version
C. Syntax error in angular.json
D. Problems with node_modules
Q.18 Identify the issue when the Angular CLI command ng serve shows the error “Could not find module “@angular/core” “.
A. Missing @angular/core module
B. Incorrect command syntax
C. Outdated Angular CLI version
D. Issues with angular.json
Q.19 Identify the correct command to create a new Angular project with SCSS as the stylesheet format.
A. ng new my-app –style=scss
B. ng create my-app –scss
C. ng generate app my-app –style=scss
D. ng new my-app –css=scss
Q.20 Which Angular CLI command would you use to add Angular Material to your project?
A. ng add @angular/material
B. ng install @angular/material
C. ng generate @angular/material
D. ng setup @angular/material
Q.21 What is the output of the following Angular CLI command:
ng g c my-component –flat?
A. A new component in a separate folder
B. A new component in the app folder
C. A new module
D. A new service
Q.22 Which command is used to serve an Angular application locally for development?
A. ng serve
B. ng start
C. ng run
D. ng develop
Q.23 What is the purpose of the angular.json file in an Angular project?
A. Define components and services
B. Set up routing
C. Configure project-specific settings
D. List TypeScript files
Q.24 In Angular, which file is primarily responsible for defining npm packages for the project?
A. angular.json
B. package.json
C. config.json
D. app.module.ts
Q.25 To update Angular to a newer version, which command is used?
A. ng update
B. ng upgrade
C. ng new version
D. ng refresh
Q.26 Which command is used to generate a new component in an Angular project?
A. ng generate service
B. ng generate component
C. ng create component
D. ng add component
Q.27 What does CLI stand for in Angular CLI?
A. Command Line Interaction
B. Command Line Interface
C. Command Language Interpretation
D. Command Link Interface
Q.28 In Angular, which file is used to define the set of modules, components, and services?
A. app.module.ts
B. app.component.ts
C. angular.json
D. package.json
Q.29 Angular is primarily maintained by which company?
A. Google
B. Facebook
C. Microsoft
D. Amazon
Q.30 Which version of Angular marked the shift from AngularJS to Angular?
A. Angular 2
B. Angular 4
C. Angular 5
D. Angular 6
Q.31 In a reactive form, how do you access a form control’s value in an Angular component?
A. Using the value property of the form control
B. Through the ngModel binding
C. By accessing the DOM directly
D. Using an event binding
Q.32 Which module must be imported to use reactive forms in Angular?
A. FormsModule
B. HttpClientModule
C. BrowserModule
D. ReactiveFormsModule
Q.33 In Angular, what is the primary difference between template-driven and reactive forms?
A. The way they handle data binding
B. The way they are created in the template
C. The way they manage form control objects
D. The modules they belong to
Q.34 When encountering “Cannot match any routes” error in Angular, what should you check first?
A. If the routes are defined correctly in the routing module
B. If the components are declared in the app module
C. If the server is running
D. If the URL is correctly formed in the browser
Q.35 If an Angular application shows a blank page instead of the desired route, what is a common issue to check?
A. Incorrect base href in index.html
B. Syntax error in the template
C. Missing import for the component
D. Wrong path in the service
Q.36 In Angular, how do you specify a parameterized route, like for a user profile?
A. /user/:id in the route path
B. /user/{id}
C. /user/?id=
D. /user/id=
Q.37 How do you programmatically navigate to a different route in Angular?
A. Using the navigate() method of the Router service
B. By changing the window.location URL
C. Using the redirectTo property in a route definition
D. Through an HTTP request to the server
Q.38 Which Angular directive is used for linking to a different route?
A. <a [routerLink]>
B. <router−link>
C. <a [href]>
D. <link−to>
Q.39 What is a ‘Route Guard’ in Angular?
A. A method to optimize route performance
B. A feature for styling routes
C. A tool for debugging routes
D. A service that controls navigation to a route based on certain conditions
Q.40 How do you pass data to a route in Angular?
A. Using query parameters
B. Through services
C. By directly accessing the component properties
D. By using local storage
Q.41 What is the purpose of the directive in Angular?
A. To define where to render the component of the active route
B. To display a list of available routes
C. To create a new route
D. To link to different parts of the application
Q.42 In Angular, how is a route defined in the routing module?
A. Using a @Route decorator
B. With an array of path and component pairs
C. Through a routing service
D. In the component metadata
Q.43 What is the primary purpose of the Angular Router?
A. Managing state within the application
B. Styling and animations
C. Navigating between views within an application
D. Data binding between components
Q.44 When encountering “NullInjectorError:
No provider for MyService”, what should be checked first?
A. If MyService is imported correctly in the component
B. If MyService is declared in the @NgModule decorator
C. If MyService is provided in the module where it’s injected
D. If MyService is annotated with @Injectable
Q.45 If a service injected into an Angular component is undefined, what is a possible cause?
A. The service is not provided in any module
B. The service is not imported in the component
C. The service does not have the @Injectable decorator
D. The service is provided in multiple modules
Q.46 How can a shared service be used to communicate between unrelated components in Angular?
A. By using a shared module
B. By setting global variables
C. By using an event emitter in the service
D. By passing data through URL parameters
Q.47 In Angular, how do you provide a service at the component level?
A. Add the service to the ‘providers’ array of the @NgModule decorator
B. Declare the service in the component’s ‘providers’ array
C. Import the service in the component’s constructor
D. Declare the service as a global variable
Q.48 What is the correct syntax to inject a service into an Angular component?
A. constructor(private myService: MyService) {}
B. constructor(public myService: MyService) {}
C. myService: new MyService()
D. Inject(MyService)
Q.49 What is the significance of the ‘providedIn’ property in Angular services?
A. It specifies the module in which the service should be provided
B. It determines the scope of the service
C. It defines the dependencies of the service
D. It sets the initialization time of the service
Q.50 How does Angular’s hierarchical injector system work?
A. Child injectors can override instances of services from parent injectors
B. Services are global and shared across the entire application
C. Injectors do not follow a hierarchy
D. Each component has its own injector
Q.51 Which decorator is used to inject a service into an Angular component or another service?
A. @Inject
B. @Injectable
C. @Input
D. @Output
Q.52 In Angular, what is Dependency Injection (DI)?
A. A design pattern for data binding
B. A method for creating responsive layouts
C. A technique for creating services
D. A design pattern that allows a class to request dependencies from external sources
Q.53 What is the primary purpose of services in Angular?
A. To manage data state
B. To handle user interactions
C. To facilitate communication between components
D. To style the application
Q.54 When the console shows an error “Can’t bind to ‘ngModel’ since it isn’t a known property of ‘input'”,
what is a possible cause?
A. The component is missing an import for FormsModule or ReactiveFormsModule
B. The ngModel directive is spelled incorrectly
C. There’s a syntax error in the template
D. The input element is not properly closed
Q.55 If a binding like {{username}} displays nothing, what might be the issue?
A. The username property is not defined in the component
B. Incorrect syntax
C. The data type of username is wrong
D. username is a private variable in the component
Q.56 In Angular, what is the output of <p [innerText]=”message”></p> if the message property is ‘Hello World’?
A. A paragraph with ‘Hello World’
B. A paragraph with ‘message’
C. A blank paragraph
D. An error
Q.57 What is the result of the following binding in Angular:
[src]=”user.imageUrl”?
A. The user.imageUrl string will be set as the text content of the element
B. The src attribute of the element will dynamically bind to the user.imageUrl property
C. The image will be displayed as a user avatar
D. An error, as it’s an incorrect syntax
Q.58 What will be the displayed value when using the following Angular template syntax: {{ 5 + 3 }}?
A. 8
B. “5 + 3”
C. 53
D. Undefined
Q.59 What is the purpose of the trackBy function in an *ngFor directive?
A. To optimize performance by tracking items with a unique identifier
B. To sort items
C. To filter items
D. To duplicate items
Q.60 What is the main use of the *ngFor directive in Angular?
A. To iterate over a set of items
B. To check a condition
C. To bind a property
D. To catch an event
Q.61 If changes to data are not reflected in the view, which lifecycle hook might be incorrectly implemented?
A. ngOnChanges()
B. ngOnInit()
C. ngAfterViewInit()
D. ngDoCheck()
Q.62 How can you respond to changes in a component’s @Input properties in Angular?
A. Implement the ngOnChanges lifecycle hook
B. Use a setter for the input property
C. Use the ngOnInit lifecycle hook
D. Observe changes in the component’s state
Q.63 In Angular, how do you detect when a component’s view has been fully initialized?
A. Implement the ngAfterViewInit lifecycle hook
B. Use the ngOnInit lifecycle hook
C. Check the view in the ngOnChanges hook
D. Observe changes in the DOM
Q.64 Which Angular lifecycle hook should be used to unsubscribe from an Observable to prevent memory leaks?
A. ngOnInit()
B. ngOnChanges()
C. ngOnDestroy()
D. ngAfterViewInit()
Q.65 In which scenario would you use the ngAfterContentChecked lifecycle hook in Angular?
A. When you need to react after Angular checks the content projected into the component
B. To modify component properties after they are checked
C. Before the view is initialized
D. After the component is destroyed
Q.66 How does the ngOnDestroy lifecycle hook help in Angular applications?
A. It provides a method to store component state
B. It is used to perform custom initialization logic
C. It is called before Angular destroys the component
D. It initializes the component’s child elements
Q.67 What is the purpose of the ngAfterViewInit lifecycle hook in Angular?
A. To clean up the component before its destruction
B. To react to the initialization of the component’s views
C. To handle changes after the view is checked
D. To execute code after the component’s content is initialized
Q.68 In Angular, which lifecycle hook is used to respond to changes in @Input properties?
A. ngOnChanges()
B. ngOnInit()
C. ngAfterContentChecked()
D. ngAfterViewChecked()
Q.69 Which lifecycle hook in Angular is called after Angular has initialized all data-bound properties of a directive?
A. ngOnInit()
B. ngOnChanges()
C. ngAfterViewInit()
D. ngOnDestroy()
Q.70 When a custom pipe throws an error in Angular, what is a common cause to investigate?
A. Incorrect implementation of the PipeTransform interface
B. Syntax error in the template
C. Incorrect input types for the pipe
D. The pipe is not included in the module declarations
Q.71 If a pipe does not update the displayed value when the input changes, what could be the issue?
A. The pipe is not stateful
B. The input is not correctly bound
C. The pipe is not declared in a module
D. The pipe’s transform method is incorrect
Q.72 How do you create a custom pipe in Angular?
A. Using the @Pipe decorator and implementing the PipeTransform interface
B. By extending a built-in pipe
C. By declaring it in a module
D. Using a service
Q.73 Which pipe would you use to convert a string to uppercase in an Angular template?
A. uppercasePipe
B. lowercasePipe
C. stringPipe
D. capitalizePipe
Q.74 What is the primary advantage of creating a custom pipe in Angular?
A. To add new features to the Angular framework
B. To create reusable transformations specific to the application
C. To replace the built-in pipes
D. To optimize the application’s performance
Q.75 How do you apply a pipe to a value in an Angular template?
A. {{ value | pipeName }}
B. [value | pipeName]
C. {{ value } & pipeName}
D. {{ value: pipeName }}
Q.76 Which built-in pipe in Angular is used for formatting dates?
A. numberPipe
B. datePipe
C. currencyPipe
D. jsonPipe
Q.77 What is the primary use of pipes in Angular?
A. To navigate between different components
B. To transform data for display
C. To manage state
D. To handle user input
Q.78 When an Observable does not emit any values, what might be a reason in the context of Angular’s HttpClient?
A. The Observable is not subscribed to
B. The server is not responding
C. There’s a syntax error in the Observable creation
D. The response type is incorrect
Q.79 If an HttpClient request in Angular fails to return data, what is a common thing to check first?
A. The URL of the request
B. The headers of the request
C. The status of the server
D. The configuration of HttpClient
Q.80 In Angular, how do you handle errors when making an HTTP request with HttpClient?
A. Using the catchError operator in the pipe function
B. With a try-catch block
C. By checking the status code in the response
D. Using an error event handler
Q.81 Which method of the HttpClient service in Angular is used to send a GET request?
A. .get()
B. .post()
C. .send()
D. .fetch()
Q.82 What is the purpose of the ‘pipe’ function in RxJS Observables used in Angular’s HttpClient?
A. To execute the Observable
B. To transform the data emitted by the Observable
C. To debug the Observable
D. To create a new Observable
Q.83 How do you subscribe to an Observable returned by an HttpClient method in Angular?
A. Using the .subscribe() method
B. With the async pipe in the template
C. Through a service
D. Using a callback function
Q.84 In Angular, what are Observables primarily used for?
A. To observe changes in form control values
B. To handle asynchronous data such as HTTP responses
C. To watch changes in component properties
D. To monitor routing events
Q.85 What is the primary use of the HttpClient service in Angular?
A. Managing local state
B. Interacting with RESTful APIs
C. Styling components
D. Handling authentication
Q.86 When a reactive form control is always invalid, what is a common issue to investigate?
A. Incorrect form control validation rules
B. Missing form control in the group
C. Incorrect data type for the form control
D. Form control not bound to the form
Q.87 If a form input bound with ngModel is not updating the model in a template-driven form, what could be a reason?
A. The ngModel directive is not imported
B. The form is not linked to the component
C. The input type is incompatible with ngModel
D. The component property is not correctly bound to ngModel
Q.88 In Angular’s reactive forms, which class represents a group of FormControls?
A. FormGroup
B. FormControlArray
C. FormControl
D. FormBuilder
Q.89 Which directive is used to bind a template-driven form input to a component property in Angular?
A. ngModel
B. ngControl
C. formControl
D. ngForm
Q.90 What is the purpose of the FormBuilder service in Angular’s reactive forms?
A. To automatically generate form components
B. To create complex form validation rules
C. To provide a shorthand for creating form groups and form controls
D. To synchronize form data with the backend
Q.91 What is the main benefit of lazy loading modules in Angular?
A. Reducing the size of the root module
B. Faster initial load time of the application
C. Simplifying the development process
D. Improving server-side rendering performance
Q.92 How do you troubleshoot a scenario where an Angular Universal app works locally but not when deployed?
A. Check server logs for errors
B. Verify the server environment configuration
C. Ensure all dependencies are installed
D. Compare local and server environments
Q.93 What common issue should you check for if your Angular Universal app isn’t rendering properly on the server?
A. Incorrect Angular Universal configuration
B. Module not found errors
C. Mismatched versions of Angular and Angular Universal
D. Routing issues
Q.94 When implementing Angular Universal, how do you handle browser-specific APIs like localStorage or window?
A. By avoiding their use entirely
B. By providing polyfills
C. By using conditional checks for platform
D. By mocking these APIs in the server environment
Q.95 How do you enable server-side rendering for an existing Angular application?
A. By adding the @angular/platform-server module
B. By running ng add @nguniversal/express-engine
C. By modifying the main.ts file
D. By updating the angular.json file
Q.96 In what scenario is Angular Universal not recommended?
A. For applications with real-time dynamic content
B. For simple Angular applications
C. For applications with heavy user interaction
D. For content-heavy websites
Q.97 How does Angular Universal enhance SEO for Angular applications?
A. By increasing page load speed
B. By generating static HTML pages
C. By optimizing JavaScript execution
D. By reducing CSS usage
Q.98 What is the primary advantage of using Angular Universal for server-side rendering?
A. Faster initial page load times
B. Easier debugging
C. Reduced client-side scripting
D. Simplified component design
Q.99 If an Angular component test is failing due to missing dependencies, how do you resolve it?
A. By importing all required modules into the test
B. By mocking all dependencies
C. By adding the missing dependencies to the TestBed configuration
D. By removing the dependencies from the component
Q.100 When a unit test fails unexpectedly in Angular, what is the first step in debugging?
A. Reviewing the test code for syntax errors
B. Checking the component or service logic
C. Verifying the test setup and dependencies
D. Looking at the error message in the test output
Q.101 In an Angular test, how do you verify that a method has been called on a component’s class?
A. Using expect().toHaveBeenCalled()
B. By checking the return value of the method
C. By observing changes in the component’s template
D. By monitoring network requests
Q.102 How do you test an Angular service that depends on HttpClient?
A. By using the real HttpClient module
B. By mocking HttpClient using TestBed
C. By manually creating a fake HttpClient instance
D. By only testing the service logic, ignoring HttpClient dependencies
Q.103 How does Angular’s TestBed utility aid in testing components and services?
A. By providing a simplified way of creating components
B. By mocking Angular’s dependency injection system
C. By automatically running tests
D. By simulating user interactions
Q.104 What is a ‘spy’ in the context of Angular testing?
A. A tool to simulate user interaction
B. A function that records calls, arguments, and returns values
C. A type of unit test
D. An assertion method
Q.105 In Angular, what is the purpose of Jasmine and Karma in the context of testing?
A. Jasmine is for unit testing and Karma for integration testing
B. Jasmine provides the framework and Karma runs the tests in a browser environment
C. Jasmine and Karma both provide testing frameworks
D. Jasmine and Karma are both used for mocking dependencies
Q.106 When an Angular Material dialog is not opening as expected, what should you investigate?
A. The MatDialog configuration in the component
B. The version of the Angular framework
C. The CSS styles applied to the dialog
D. The HTML structure of the application
Q.107 If Angular Material components are not displaying correctly, what is a common thing to check first?
A. The version of Angular Material
B. The browser compatibility
C. The import of Angular Material modules in the app module
D. The network connection
Q.108 How do you create a responsive sidebar using Angular Material?
A. Using the MatSidenavModule
B. With the MatToolbarModule
C. By applying CSS media queries
D. Through the MatMenuModule
Q.109 Which Angular Material module should be imported to use form field components?
A. MatFormFieldModule
B. MatInputModule
C. MatButtonModule
D. MatToolbarModule
Q.110 What is the purpose of the MatDialog component in Angular Material?
A. To create a service
B. To display a modal dialog
C. To build a navigation menu
D. To show notifications
Q.111 How do you apply a theme in Angular Material?
A. By using a CSS file
B. Through a JavaScript configuration
C. By importing a pre-built theme in styles.scss
D. By creating a custom service
Q.112 What is Angular Material primarily used for?
A. Creating RESTful services
B. Implementing complex algorithms
C. Designing responsive UI components
D. Managing application state
Q.113 In NgRx, when an effect does not emit an action or causes an error, what is a common debugging approach?
A. Check the effect’s source observable
B. Verify the action types the effect is listening for
C. Inspect the effect’s error handling logic
D. Review the overall state management architecture
Q.114 If an action does not trigger the expected state change in NgRx, what should you investigate first?
A. The action type in the reducer
B. The state mutation logic in the reducer
C. The action dispatching process
D. The store configuration
Q.115 How do you handle asynchronous operations like API calls in NgRx?
A. Using reducers
B. With selectors
C. Through effects
D. By subscribing to the store
Q.116 How do you create an action in NgRx?
A. Using the createAction function
B. By defining a class that implements the Action interface
C. By dispatching a string to the store
D. By calling a service method
Q.117 How does NgRx’s Effect class contribute to state management?
A. By directly mutating the state
B. By synchronizing the state with a backend service
C. By handling side effects of actions
D. By dispatching new actions
Q.118 In NgRx, what is the purpose of selectors?
A. To dispatch actions to the store
B. To reduce the state based on the action
C. To select and derive data from the store
D. To handle asynchronous operations
Q.119 What is the primary role of a reducer in NgRx?
A. To dispatch actions
B. To mutate the state in response to actions
C. To select data from the store
D. To handle side effects
Q.120 When a component’s view does not update as expected after data changes, which lifecycle hook can help diagnose the issue?
A. ngOnChanges()
B. ngAfterViewChecked()
C. ngOnInit()
D. ngAfterViewInit()
Q.121 In an Angular application integrated with a backend service, how do you troubleshoot issues related to CORS (Cross-Origin Resource Sharing)?
A. By inspecting the network requests in the browser’s developer tools
B. By modifying the Angular service calls
C. By adjusting the backend service’s CORS configuration
D. By disabling CORS in the browser
Q.122 When integrating an external API into an Angular application, what is a primary aspect to debug if data is not being displayed as expected?
A. The API endpoint URL
B. The structure of the data returned by the API
C. The version compatibility between the API and Angular
D. The configuration of the HttpClient used to call the API
Q.123 What is a common method for integrating Angular with a WebSocket service for real-time data updates?
A. Using Angular’s HttpClient module
B. Implementing a WebSocket service using RxJS
C. Utilizing third-party WebSocket libraries
D. Creating a custom Angular directive for WebSocket communication
Q.124 How do you integrate a JavaScript library, like D3.js, into an Angular application for data visualization?
A. By directly adding a <script> tag in the index.html
B. By importing the library in the Angular component where it’s used
C. By using an Angular wrapper for the library
D. By including the library in the global scripts array in angular.json
Q.125 What is an important consideration when integrating Angular with third-party UI component libraries?
A. Ensuring the library supports Angular’s change detection mechanism
B. The library’s ability to mimic Angular’s native components
C. The color scheme compatibility of the library with Angular
D. The performance impact of the library on Angular’s rendering process
Q.126 In the context of integrating Angular with serverless architectures, what is a key benefit?
A. Reduced initial setup time
B. Decreased reliance on client-side processing
C. Scalability and cost-effectiveness of server resources
D. Enhanced control over server-side code execution
Q.127 When integrating Angular with a Content Management System (CMS), what aspect is crucial to consider for seamless operation?
A. The CMS’s theme system
B. The compatibility of the CMS’s API with Angular
C. The CMS’s plugin ecosystem
D. The server-side rendering capabilities of the CMS
Q.128 How does integrating Angular with state management libraries like Redux or NgRx benefit an application?
A. By simplifying data binding in templates
B. By providing a more structured approach to managing state
C. By enhancing Angular’s built-in directives
D. By automatically optimizing performance
Q.129 What is the main purpose of integrating Angular with backend technologies like Node.js or ASP.NET?
A. To enhance Angular’s performance
B. To provide data persistence and server-side processing
C. To improve Angular’s security features
D. To enable offline capabilities in Angular applications
Q.130 How can you troubleshoot an Angular animation that causes layout issues during the animation sequence?
A. By adjusting the timing of the animation
B. By using the inspect element tool to analyze changes
C. By reviewing the animation states and transitions
D. By checking for conflicting CSS styles
Q.131 When an Angular animation does not play as expected, what is a common aspect to check first?
A. The animation trigger in the template
B. The import of the BrowserAnimationsModule
C. The syntax of the animation definition
D. The styles applied to the animated element
Q.132 To perform a complex sequence of animations in Angular, which function should be used?
A. animate()
B. sequence()
C. group()
D. transition()
Q.133 How do you attach an animation to a component in Angular?
A. By adding the animation to the component’s template
B. By using the @Animation decorator in the component class
C. By importing the animation in the component’s metadata
D. By defining the animation in the component’s CSS file
Q.134 In Angular animations, what is the difference between ‘style()’ and ‘animate()’ functions?
A. ‘Style()’ defines inline styles, while ‘animate()’ creates motion between styles
B. ‘Style()’ is for CSS styles, and ‘animate()’ is for JavaScript animations
C. ‘Style()’ creates permanent styles, while ‘animate()’ creates temporary animations
D. ‘Style()’ and ‘animate()’ are interchangeable
Q.135 What is the role of ‘animation triggers’ in Angular animations?
A. To start and stop animations based on user actions
B. To define the state transitions and styles for animations
C. To synchronize multiple animations
D. To trigger animations on route changes
Q.136 How does Angular handle animations under the hood?
A. By using JavaScript to directly manipulate the DOM
B. Through CSS transitions and animations enhanced by Angular’s APIs
C. By using a third-party animation library
D. By integrating with the Web Animations API
Q.137 What is the primary purpose of the Angular animations module?
A. To add interactive elements to the application
B. To enhance the performance of Angular applications
C. To create complex animated UIs
D. To simplify component testing
Q.138 How do you diagnose issues in Angular related to nested routing not rendering components as expected?
A. By inspecting the router configuration for parent-child relationship errors
B. By checking the console for errors
C. By verifying the component selectors
D. By analyzing the Angular router’s debug logs
Q.139 When a lazily loaded module in Angular does not load, what should be checked first?
A. The module’s import statements in the main app module
B. The network request for the module’s bundle
C. The loadChildren syntax in the route configuration
D. The module’s dependencies
Q.140 What is a common approach to handling complex routing scenarios with nested routes in Angular?
A. Using multiple tags
B. Configuring parent-child routes in the routing module
C. Splitting the application into micro-frontends
D. Using third-party routing libraries
Q.141 How do you configure a route in Angular to be lazily loaded?
A. By using the loadChildren property in the route configuration
B. By setting lazyLoading: true in the route definition
C. By using a special lazy-loaded module
D. By importing the module in the main routing module
Q.142 What role do route resolvers play in Angular’s routing?
A. They optimize the rendering of routes
B. They handle errors during routing
C. They preload data before a route is activated
D. They manage route animations
Q.143 In Angular, how does the canActivate guard affect routing?
A. It changes the routing strategy
B. It allows navigation to a route to be controlled programmatically
C. It enhances route animation
D. It optimizes route loading
Q.144 What is the primary benefit of implementing lazy loading in Angular routing?
A. Improved maintainability of the application
B. Faster server-side rendering
C. Reduced initial bundle size leading to faster application load times
D. Easier testing
Q.145 How do you identify and resolve memory leaks in Angular applications?
A. By using the ngOnDestroy lifecycle hook to clean up subscriptions
B. By increasing the memory limit
C. By reducing the number of components
D. By minimizing the use of third-party libraries
Q.146 When diagnosing performance issues in an Angular application, what tool can be used to profile and analyze change detection cycles?
A. Angular CLI
B. Chrome DevTools
C. Visual Studio Code
D. Angular Augury
Q.147 What is the recommended way to handle complex calculations in Angular to prevent performance issues?
A. Performing calculations in the component constructor
B. Using a web worker
C. Calculating values in the template
D. Storing results in local storage
Q.148 How do you implement onPush change detection strategy in an Angular component?
A. By setting the changeDetection property in the @Component decorator to ChangeDetectionStrategy.OnPush
B. By invoking the onPush method on the component class
C. By using the ngOnPush lifecycle hook
D. By importing the OnPush module
Q.149 What is the purpose of using trackBy with ngFor in Angular?
A. To track items by a unique identifier for performance optimization
B. To change the order of items dynamically
C. To filter items in the list
D. To create a new list from the existing one
Q.150 How does Angular’s change detection mechanism contribute to performance optimization?
A. By updating the DOM in real-time
B. By minimizing the number of DOM manipulations
C. By reloading the component on every change
D. By bypassing the Angular framework
