Angular mock test: free online practice

What does the Angular mock test cover?

The test covers 13 topics across three levels. Each attempt picks 15 to 30 questions at random, by the level you choose, so every attempt is different.

• RxJS and Observables
• Signals
• Routing and Guards
• Services and DI
• Directives and Control Flow
• Forms
• Change Detection
• Components and Templates
• HTTP and Interceptors
• Performance and Lazy Loading
• Data Binding
• Lifecycle Hooks
• Pipes

Sample Angular mock test questions

One question from each level, the way they appear in the test. A new set comes on the 1st of every month. Try it, then open the answer.

1. FresherHTTP and Interceptors

   How do you tell TypeScript that http.get returns a list of Job objects?

   • Pass a type argument: this.http.get<Job[]>('/api/jobs')
   • Cast the URL: this.http.get('/api/jobs' as Job[])
   • You cannot; HttpClient returns only strings
   • Call .json<Job[]>() on the Observable
   Show the answer

   Answer: Pass a type argument: this.http.get<Job[]>('/api/jobs'). get<Job[]>() types the Observable as Observable<Job[]>. It is only a compile-time hint: Angular does not check the JSON at runtime, so a server that sends a different shape still gets through.

2. Intermediate (1-5 years)Directives and Control Flow

   What happens in Angular 17 if you write a @for block without track?

   • Angular silently tracks by object identity
   • The template fails to compile, because track is required
   • It tracks by $index and logs a warning
   • The list renders but never updates
   Show the answer

   Answer: The template fails to compile, because track is required. Unlike *ngFor, where trackBy was optional, @for makes track mandatory so every list has a clear identity. Use a stable unique key such as job.id; track $index is allowed when items have no id.

3. Experienced (5+ years)RxJS and Observables

   In RxJS 7, what does this code log, in order?

   forkJoin([of(1, 2, 3), of('a')])
       .subscribe(v => console.log(v.join(' ')));

   • 1 a
   • 1 2 3 a
   • a 3
   • 3 a
   Show the answer

   Answer: 3 a. forkJoin waits for every source to complete and then emits one array with each source's last value: 3 from the first and a from the second. That is why it suits parallel HTTP calls, which emit once.

Take the full Angular mock test: 15 to 30 questions and 15 to 30 minutes, by level.

How is the Angular mock test scored?

A question counts as right only when you pick exactly the right option, or all the right options where it says so; a question left blank counts as wrong. Your score is the share of the test's questions you got right (15 to 30, by level). The result also scores every topic, so you know what to revise before the interview.

• 75% or more in a topica strength
• 50% to 74%worth a revision
• Under 50%a topic to work on