A little test

Danny Thombs Jan. 5, 1994 Science

Multiple Choice

Circle the letter of the best answer. 1. When do magnets repel each other? a) when poles are the same b) when poles are different c) when in water d) when in high altitudes 2. How do you demagnetize a temporary magnet? a) drop it b) reverse the poles c) all of the above d) heat on high in microwave for three minutes 3. The north magnetic pole is located in... a) the geographic north pole b) in northern Canada c) in Sweden d) in Antartica 4. At what temperature does a superconducter work at? a) absolute zero b) zero c) 75 F d) 210 F 5. A transformer does this to voltage... a) increases b) decreases c) all of the above d) destroys it 6. If you break a magnet it will... a) have poles on each piece b) destroy the poles c) cost money to replace d) make a mess on the floor 7. If you put a compass near a magnet it will... a) get pushed away b) be attracted c) do nothing d) explode 8. A magnetic field is stronger at its... a) center b) poles c) corners d) handles 9. A galvonometer measures... a) electric currents b) water currents c) speed d) shopping budgets 10. To increase the magnatism in an electromagnet... a) wrap the wire around the piece of iron more times b) increase the power c) all of the above d) remove the wire

True or False

Circle the correct answers. 11. Magnatism can be made from electricity. True or False 12. Some magnets have two north poles. True or False 13. Electric and magnetic force increases when you increase the distance. True or False 14. An alternator is a generator that creates an alternating current. True or False Fill in the Blank 15. An electric moter changes electric energy into __________ energy. 16. The earth has a _________ field. 17. An electromagnet uses ___________ to make a magnet. 18. A super conducter has no energy wasted as __________. 19. A generator can produce a direct or ____________ current. Questions 20. What are three simalaraties between Lincoln's assasination and Kennedy's 21. What are these three substances are attracted to magnets. Answers 1)a 2)c 3)b 4)a 5)c 6)a 7)a 8)b 9)a 10)c 11)True 12)False 13)False 14)True 15)kinetic 16)magnetic 17)electricity 18)heat 19)alternating 20)free question 21)iron, nickel, cobalt