Pregunta de entrevista de Siemens

1.Can you create controller in angularjs? 2.Difference between ng-model and {{}} and ng-bind 3.Difference between facory method and service method of creating a service?? what factory method is more advantageous?? 4.what does link function do in a directive? 5.Explain describe block in unit testing of angular with jasmine 6.Polymorphism in javascript? 7.Number of classes in bootstrap(xs,s,m) 8.Promises in angular and about $q 9.How to communicate between two controllers. 10.How to make a website fit to screen without using any bootstrap 11.Explain box model and who introduced it?