Baby caitlen is about to turn one year old. she loves to play peek-a-boo and acts so surprised each time a hidden face appears behind her dad's hands. why is she surprised?

Caitlen doesn't that each times her dad hides he still exists.

Explanation:

Baby Caitlen is still one year old this means that she is still learning that things still remain when they disappear and come back in sight. The psychologist Jean Piaget called this principle "object permanence". As the baby grows older this effect seems to wean off. The baby is learning that things do not disappear but are merely out of sight.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current