Which statement about relative motion is not true? A. A seated passenger on a plane is motionless relative to the plane.
B. A flight attendant walking down the aisle is in motion relative to the plane/
C. A plane appears motionless to a skydiver who jumps out of it.
D. The plan appears to be moving across the sky relative to a person watching from the ground.

Explanation:

laws of physics which apply when you are at rest on the earth also apply when you are in any reference frame which is moving at a constant velocity with respect to the earth. For example, you can toss and catch a ball in a moving bus if the motion is in a straight line at constant speed.

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

i would say b

explanation:

but i think i would need more information than that