Angular Tutorial 0/42 lessons ~6 min read Lesson 40“Build scalable apps”

Angular Interview Questions & Answers

283 curated Angular interview questions with concise modern answers — fundamentals, components, DI, RxJS, Signals, SSR, security, forms, performance and testing — for frontend interviews in 2025.

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Focus

9 guided sections

Practice signal

Concept-first lesson

Career prep

Foundation builder

Introduction

This lesson is a comprehensive set of 283 Angular interview questions and answers — covering everything from fundamentals to modern Signals, SSR & hydration. Each question is paired with a concise, correct answer and (where useful) a small code snippet you can recall on the spot.

Use it as a final-mile revision after going through the tutorial and quiz. Topics are grouped into eight thematic sections so you can drill the area you need most.

1. Angular Fundamentals & Core Concepts (Q1–Q30)

2. Pipes, Observables & RxJS (Q31–Q60)

3. Directives, Router & Compilation (Q61–Q90)

4. Compiler Options, Animation & Workers (Q91–Q120)

5. CLI, Workspace & Misc (Q121–Q150)

6. Change Detection, Security & i18n (Q151–Q190)

7. Templates, Modules & Providers (Q191–Q240)

8. Zones, Forms, Signals & Modern Angular (Q241–Q283)

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Angular Interview Questions & Answers

Introduction

1. Angular Fundamentals & Core Concepts (Q1–Q30)

1. What is Angular Framework?

2. What is the difference between AngularJS and Angular?

3. What is TypeScript?

4. Write a pictorial diagram of Angular architecture?

5. What are the key components of Angular?

6. What are directives?

7. What are components?

8. What are the differences between Component and Directive?

9. What is a template?

10. What is a module?

11. What are lifecycle hooks available?

12. What is data binding?

13. What is metadata?

14. What is Angular CLI?

15. What is the difference between constructor and ngOnInit?

16. What is a service?

17. What is dependency injection in Angular?

18. How is Dependency Hierarchy formed?

19. What is the purpose of async pipe?

20. What is the option to choose between inline and external template file?

21. What is the purpose of *ngFor directive?

22. What is the purpose of ngIf directive?

23. What happens if you use script tag inside template?

24. What is interpolation?

25. What are template expressions?

26. What are template statements?

27. How do you categorize data binding types?

28. What are pipes?

29. What is a parameterized pipe?

30. How do you chain pipes?

2. Pipes, Observables & RxJS (Q31–Q60)

31. What is a custom pipe?

32. Give an example of custom pipe?

33. What is the difference between pure and impure pipe?

34. What is a bootstrapping module?

35. What are observables?

36. What is HttpClient and its benefits?

37. Explain on how to use HttpClient with an example?

38. How can you read full response?

39. How do you perform Error handling?

40. What is RxJS?

41. What is subscribing?

42. What is an observable?

43. What is an observer?

44. What is the difference between promise and observable?

45. What is multicasting?

46. How do you perform error handling in observables?

47. What is the shorthand notation for subscribe method?

48. What are the utility functions provided by RxJS?

49. What are observable creation functions?

50. What will happen if you do not supply handler for the observer?

51. What are Angular elements?

52. What is the browser support of Angular Elements?

53. What are custom elements?

54. Do I need to bootstrap custom elements?

55. Explain how custom elements works internally?

56. How to transfer components to custom elements?

57. What are the mapping rules between Angular component and custom element?

58. How do you define typings for custom elements?

59. What are dynamic components?

60. What are the various kinds of directives?

3. Directives, Router & Compilation (Q61–Q90)

61. How do you create directives using CLI?

62. Give an example for attribute directives?

63. What is Angular Router?

64. What is the purpose of base href tag?

65. What are the router imports?

66. What is router outlet?

67. What are router links?

68. What are active router links?

69. What is router state?

70. What are router events?

71. What is activated route?

72. How do you define routes?

73. What is the purpose of Wildcard route?

74. Do I need a Routing Module always?

75. What is Angular Universal?