Dynamically display input checkbox using ng-repeat based on condition

I am trying to dyanmically display checkbox with labels based on conditional flag. The label values are as follows:

$scope.listA = [
   {
     name : "Sample 1"
   },
   {
     name : "Sample 2"
   }
];
$scope.listB = [
   {
     name : "Result 1"
   },
   {
     name : "Result 2"
   },
   {
     name : "Result 3"
   }
];

This is the html I am using.

<input type="checkbox" ng-repeat="item in listA"/>{{item.name}}

I have a variable based on which i need to display either $scope.listA or $scope.listB.

var mode = "A";

If mode = A then i need to show listA as checkbox labels. If anything else then i need to show listB as checkbox labels.

How can i go about doing this? And how can i make the checkboxes to be checked by default?