Angular MCQs with Answers

Which of the following is not a hook in Angular 2 application life cycle.
A)
ngOnInit
B)
ngOnChanges
C)
ngAfterViewInit
D)
ngViewStart

Correct Answer :   ngViewStart

Explanation : ngViewStart is not a hook in Angular 2 application life cycle.

Recent Updates in Angular
Q .
When using FormBuilder, how are validation rules specified?
A)
As part of the FormControl configuration: heroName: ['', Validators.required]
B)
As part of the FormControl configuration: heroName: [Validators.required, '']
C)
As standard HTML validation attributes added to the input element
D)
As part of the input element binding: formControl="[heroName, Validators.required]"

Correct Answer :   As part of the FormControl configuration: heroName: ['', Validators.required]

Q .
Which of the following will map the name of an input parameter "userData" to a field named "users"?
A)
@Input('userData') users
B)
@Input() userData: users
C)
@Input() users: userData
D)
@Input('users') userData

Correct Answer :   @Input('userData') users

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