Category 1

1. Category 1 10 20 30 40 50 Category 2 10 20 30 40 50 Category 3 10 20 30 40 50 Category 4 10 20 30 40 50 Category 5 10 20 30 40 50

2. Category 1 questions follow

3. The source of magnetism is_ Electron spin on their axies Electrons moving around the nucleus moving electric charge Aligned atoms One of the above is not correct. A, b, c and d are correct 10 Category 1

4. Correct Electron spin on their axis Electrons moving around the nucleus moving electric charge alignment can induce a magnetism, but it is not the source 10 Category 1

5. Biomagnetism or the presence of magnetite has been found in all of these but ____ Horses Bees Humans dolphins 20 Category 1

6. horses 20 Category 1

7. Which statement is not correct? Magnetic fields affect electric fields Electrical fields affect magnetic fields Moving charges interact with electric or magnetic fields Magnetism can be caused by magnetic domains which have multiple directions 30 Category 1

8. D. Is wrong Magnetism can be caused by magnetic domains which have multiple directions All the domains must have most or all of the domains in the same direction. 30 Category 1

9. An iron rod can become magnetic when…. The atoms in the domains are aligned in the same direction The net spins of its electrons are in the same direction 40 Category 1

10. A. The atoms in the domains are alligned in the same direction 40 Category 1

11. Describe the magnetic field lines about a wire Circle the wire in closed loops Moves at 90 degree angles to loop 50 Category 1

12. Describe the magnetic field lines about a wire Circle the wire in closed loops Moves at 90 degree angles to loop Both 50 Category 1

13. Category 2 questions follow

14. What are properties of a permanent magnet? 10 Category 2

15. Permanent magnets Can not be turned off Occur in nature as lodestone which is a type of magnetite Magnetism of these is caused by the spinning of the electrons, not motion through a conductive material 10 Category 2

16. Cosmic rays hit the Earth with the greatest intensity At the equator The poles Evenly over the earth They don’t hit the Earth, they bounce off the ionosphere 20

17. B the poles Just like a magnet 20 Category 2

18. A change in the magnetic field in a closed loop of wire Induces a current through electromagnetism Induces voltage Both an and b 30 Category 2

19. Both A change in the magnetic field in a closed loop of wire induces a current called voltage through the process of electromagnetism 30 Category 2

20. Moving a magnet into a coil of wire Produces an electromagnet Produces a current in the wire both 40 Category 2

21. Both Moving a magnet into a coil of wire produces an electromagnet because it produces a current in the wire 40 Category 2

22. The strength of an electromagnet can be increased by Increasing the current in the wires Adding a rod of iron into the current-carrying coil By increasing the number of coils All are correct 50 Category 2

23. All are correct The strength of an electromagnet can be increased by Increasing the current in the wires Adding a rod of iron into the current-carrying coil By increasing the number of coils 50 Category 2

24. Category 3 questions follow

25. Tripling the number of coils that a magnet is pushed into will _______ the current produced Not affect Double Triple Have 1/3 10 Category 3

26. Triple If the coils are doubled, double the current If the coils are 10 X the current is 10 X 10 Category 3

27. AC power _____________ DC is Safer than Can multiply power, not Can be transformed to travel great distances than 20 Category 3

28. AC power is easy to transform from high to low to high power, not DC 20 Category 3

29. Which is not correct? Electrons move at speeds of less than a cm/sec in a dc current Heating a wire decreases electrical resistance Use a thicker wire to decrease electrical resistance The primary purpose of a lightning rod is to disapate ions from the structure It is better to be in a metal building during a lighting strike 30 Category 3

30. Which is not correct? Electrons move at speeds of less than a cm/sec in a dc current Heating a wire decreases electrical resistance Use a thicker wire to decrease electrical resistance The primary purpose of a lightning rod is to disapate ions from the structure It is better to be in a metal building during a lighting strike 30 Category 3

31. What is the difference between an MHD generator and a conventional generator? 40 Category 3

32. The MHD has no moving parts and because it can operate at high temperatures it is much more efficient. 40 Category 3

33. How are electric motors and generators similar? 50 Category 3

34. A motor transforms electrical energy into mechanical, a generator converts mechanical energy into mechanical energy. The input and outputs are opposite. 50 Category 3

35. Category 4 questions follow

36. What type of transformers converts low voltage into high voltage? A ___________ transformer Step-up Step-down Optimus Prime 10 Category 4

37. Step-up Transformers convert low to high power 10 Category 4

38. A step-up transformer increase Power energy Both power and energy Neither power and energy 20 Category 4

39. A step-up transformer increases D. Neither power and energy 20 Category 4

40. Which is not correct? Electrical diode converts ac to dc If you plug a 110 V device into a 220 V socket you get ½ the current that you need. Touching a light fixture at 110 V is more dangerous than touching a VanDe Graff generator with 100,000 volts The source of electrons in an electric cord is the electric cord itself A potential difference is necessary for current to flow in a wire. 30 Category 4

41. Which is not correct? Electrical diode converts ac to dc If you plug a 110 V device into a 220 V socket you get ½ the current that you need. Touching a light fixture at 110 V is more dangerous than touching a VanDe Graff generator with 100,000 volts The source of electrons in an electric cord is the electric cord itself A potential difference is necessary for current to flow in a wire. 30 Category 4

42. Which of the following is not correct? As more lamps are put into a series circuit, the overall current in the power source decreases As more lamps are put into a parallel circuit, the overall current in the power source will increase A safety fuse should always be hooked up in parallel When two lamps are connected in series to a battery, the electrical resistance that the battery senses is more than the resistance of either lamp When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is less than the resistance of either lamp 40 Category 4

43. Which of the following is not correct? As more lamps are put into a series circuit, the overall current in the power source decreases As more lamps are put into a parallel circuit, the overall current in the power source will increase A safety fuse should always be hooked up in parallel When two lamps are connected in series to a battery, the electrical resistance that the battery senses is more than the resistance of either lamp When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is less than the resistance of either lamp 40 Category 4

44. Electric current can be generated by A rapid change of a magnetic field A generator 50 Category 4

45. Electric current can be generated by A rapid change of a magnetic field A generator, not a motor 50 Category 4

46. Category 5 questions follow

47. Likes Like electric charges repel other like charges Like poles repel each other Both a & B 10 Category 5

48. Both Fields surrounding every moving electron is both electric and magnetic So like repels in both Opposites attract in both 10 Category 5

49. A ________ is noted for its absence of electric resistance 20 Category 5

50. A ____Superconductors____ is noted for its absence of electric resistance 20 Category 5