What is the difference between the names of native browser events and prototype custom events?

Consider the following code snippet: Sortable.create('id1'); Assume that nodes which id: id11, id12 are children of id1 and nodes which id: id111, id112 are children of id11. Which of the following elements can be sortable?

What is the valid range of $R(1, 10, true);?

__________ allows more than one effects to occur at the same time.

Consider the following code snippet: Element.addMethods({  : show: function(element) {  : alert('This is prototype.');   } }); What does this code snippet do?

If you create a draggable object, but do not create any droppable objects, then the draggable object cannot be moved by drag and drop actions.

Which object allows you to monitor Ajax activities?

When is the Ddom:loaded event fired?

What is the result of the following code snippet? [1, 2, 3, 4, 5].detect(function(n) {return n % 3});

Which effects are core effects?

Which of the given options is the result of the following code snippet?
new Builder.node('div', {className: 'error'}, 'Error');