updating intermediate level questions

Author: khan4019

README.md

@@ -87,12 +87,15 @@ For the beginners level an interviewer wants to know whether this interviewee is
 
 ### Understanding Basic Concepts Questions
 1. Why would you use angular over some other framework like react?
-2. Difference between promise and observable?
+2. What is the difference between an observable and a promise?
 3. Tell me the difference between a component and a directive?
 4. Why would you use typescript aka benefits of typescript?
 5. Why different life cycle hooks is needed for a component/directive?
-6. Why angular uses rxjs
-7. what is the purpose of using zone js
+6. Why angular uses rxjs?
+7. What is the purpose of using zone js?
+8. What is the difference between ngOnInit() and constructor() of a component?
+9. When will ngOnInit be called? How would you make use of ngOnInit()?
+
 
 
 
@@ -102,67 +105,50 @@ Answers link coming soon
 
 ## Intermediate Level
 
-you built angular2 you played with routing, https, different built process, unit test, etc. here are the questions you could expect
+In the intermediate level, you built medium size angular app and you played with routing, https, different built process, unit test, etc. here are the questions you could expect
 
-In the intermediate level you are very comfortable with angular. Hence there is no what questions. Actually you know all of them by now. Hence there will be only how and why type questions
 
 
 ### Essential Terminology Questions
+1. How will you protect a route for authorized user only?
+1. What is a custom pipe and how will you use it?
+1. What is a structural directive?
 1. What is the difference between RouterModule.forRoot() vs RouterModule.forChild()? Why is it important?
-1. What is the difference between an observable and a promise?
-1. What are some of the angular apis that are using observables?
 1. What is the difference between a module's forRoot() and forChild() methods and why do you need it?
-1. What is a structural directive?
-1. What pseudo-class selector targets styles in the element that hosts the component?
 1. What's the difference between dirty, touched, and pristine on a form element?
-1. What is a structural directive?
-1. What is an async pipe?
-1. What kind of data can be used with async pipe?
-1. What is the difference between ngOnInit() and constructor() of a component?
-1. When will ngOnInit be called?
-1. How would you make use of ngOnInit()?
-9. What is authGuard 
+1. What is an async pipe? What kind of data can be used with async pipe?
 1. What is injectable? Give me some example.
 9. What is a pure pipe?
-
+1. How will you create two way data binding in Angular?
 
 
 
 ### Comfortability to Build Medium Size App Questions
 1. How do components communicate with each other?
-1. How do you create two way data binding in Angular?
-1. What is the purpose of NgModule?
 1. How do you decide to create a new NgModule?
+1. How will you inject custom header in your http call?
 1. How do you identify a structural directive in html?
-1. How would you select a custom component to style it.
+1. How would you select a custom component to style it?
 1. How would you select all the child components' elements?
-1. How would you make use of ngOnInit()?
 1. How would you cache an observable data?
-1. How will you inject header
-7. How you create custom pipes
-1. How would you create a custom pipe?
-1. How would you pass data from a parent component to a child component?
-1. How would you pass data from a child component to a parent component?
 1. How would you cache observable data?
 1. How do you mock a service to inject in a unit test?
-1. How do you mock a module in a unit test?
 6. How would you run unit test? 
-2. How will you protect a route for authorized user only
+
 
 
 ### Core Concepts Understandability Questions
-1. Why angular2 uses decorator
-1. When will ngOnInit be called?
+1. Tell me about feature module and shared module?
+1. What would you not put shared module?
+1. Why angular uses decorator?
+1. What is async validation and how is it done?
 1. Why do you need type definitions?
 1. Which components will be notified when an event is emitted?
-1. Why would you create shared module?
-1. What would you not put shared module?
 1. Why would you export from ngModule?
 1. Why is it bad if SharedModule provides a service to a lazy loaded module?
-1. What is the difference between an observable and a promise?
 1. Can you explain the difference between ActivatedRoute and RouterState?
 1. which service will you put in the module and why
-1. What is async validation and how is it done?
+