1. Chapter 7 Review Test on Friday, December 7!

2. Magnetic field lines flow from a magnet’s  A. north pole to south pole  B. south pole to north pole  C. center to the outside  D. outside to the center

3. Which of the following is characteristic of magnetic material?  A. their atoms are all aligned  B. their atoms are arranged in magnetic domains.  C. they are all nonmetals.  D. they are all made of lodestone.

4. The Earth’s magnetic field helps to protect living things from  A. ultraviolet light  B. meteors  C. the Northern lights  D. charged particles

5. To produce a magnetic field around a copper wire, you have to  A. place it in Earth’s magnetic field  B. run a current through it.  C. supply kinetic energy to it.  D. place it near a strong magnet.

6. An electric current is produced when a wire is  A. stationary in a magnetic field  B. moving in a magnetic field  C. place between the poles of a magnet.  D. coiled around a magnet.

7. In a generator, kinetic energy is converted into  A. light energy  B. chemical energy  C. electrical energy  D. nuclear energy

8. In an AC circuit, the current moves  A. back and forth  B. from one end of a generator to the other  C. from one end of a battery to the other  D. in one direction

9. What is the function of the turbine in a power plant?  A. to increase the voltage  B. to convert DC to AC  C. to cool the steam  D. to turn the coil or magnet

10. Which type of transformer does current pass through before it goes into neighborhoods?  A. step-up transformer  B. shaft  C. step-down transformer  D. generator

11. Put the steps of the scientific method in order  A. conclusion  B. hypothesis  C. data  D. problem  E. experiment  F. research

12. What are the two general types of energy?  A. potential and mechanical  B. nuclear and mechanical  C. kinetic and potential  D. heat and light  E. kinetic and light

13. A qualitative observation  A. uses numbers  B. is made with your senses  C. is always true  D. is an inference

14. A quantitative observation  A. uses numbers  B. is made with your senses  C. is always true  D. is an inference

15. What is the name of the force exerted by a magnet?  A. force  B. magnetism  C. magnetic domain  D. attraction

16. If you cut off the north pole of a magnet, what happens to the remaining part?   a. It is no longer a magnet.   b. It has two south ends.   c. Its domains become random.   d. It has a new north pole.

17. What happens when you bring the south poles of two magnets together?  A. they attract  B. they pull together  C. they repel  D. nothing

18. What happens when you remove a temporary magnet from a stronger magnetic field?  A. it becomes a magnet  B. it stops being a magnet  C. the domains line up  D. the poles reverse

19. You can increase the strength of an electromagnet by  A. adding more loops of wire and wrap it tighter  B. adding more loops of wire and a bigger piece of iron  C. adding more voltage and a bigger piece of iron  D. adding more voltage and more loops of wire

20. What uses electromagnets to convert electrical energy into motion?  A. electric motor  B. electric generator  C. transformer  D. commutator

21. A transformer uses _______ to increase and decrease voltage.  A. magnetism  B. coils  C. current  D. resistance

22. The current that enters your home is _______ because it reverses direction.  A. electric current  B. direct current  C. electromagnet current  D. alternating current