Question

_____1.   Which statement about a Maglev train is true?

A.The friction working against the train is fluid friction.

B.The electromagnets in the Maglev trains do not contain an iron core.

C.Using alternating current continually alternates the polarity of the poles (north changes to south and south to north).

D.All of these are true.

_____2. Push a magnet into a coil of wire and the coil

A. Becomes an electromagnet, while the magnet is in motion

B.Has a current in it, while the magnet is in motion

C.Both A and B

D.Becomes an electromagnet whether the magnet is moving or not.

_____3. A device that transforms electrical energy to mechanical energy is a

A. Generator     B. motor     C. transformer     D. magnet

____4. The metal detectors that people walk through at airports operate via

A. Ohm’s Law     B. Oersted’s Law     C. Faraday’s Law     D. Coulomb’s Law

____5. You are on board a ship near the equator. Your compass is pointing to the north. The ship passes through the equator and is now in the southern hemisphere. What happens to your compass?

A.It does not change.

B.It swings around and points toward the south pole.

C.It swings back and forth, pointing first one way, then the other.

Answer 1