PS 6.8.1 – 6.8.5 TEST 10 8TH GRADE SCIENCE

LIGNITE B. MAGTITE C. MAGNETITE D. MAGNET MORE THAN 2000 YEARS AGO GREEKS DISCOVERED DEPOSITS OF A MINERAL THAT WAS A NATURAL MAGNET CALLED _______. LIGNITE B. MAGTITE C. MAGNETITE D. MAGNET 2. THE PROPERTIES AND INTERACTIONS OF MAGNETS IS CALLED _________. COBALT B. MAGNETITE C. MAGNETISM D. ATTRACT 3. THIS EXERTS A FORCE ON OTHER MAGNETS AND OBJECTS MADE OF MAGNETIC MATERIALS. MAGNETIC FIELD B. MAGNETIC POLE C. ATTRACTION D. MAGNETIC RANGE

4. WHERE THE MAGNETIC FORCE EXERTED BY THE MAGNET IS STRONGEST. MAGNETIC FIELD B. MAGNETIC FORCE C. MAGNETIC SHIELD D. MAGNETIC POLE 5. NORTH AND SOUTH POLES OF MAGNETS ALWAYS _______ EACHOTHER. REPEL B. GO AROUND C. DOMAIN D. ATTRACT 6. 2 NORTH POLES AND 2 SOUTH POLES OF 2 MAGNETS _________ EACHOTHER. A. REPEL B. GO AROUND C. DOMAIN D. ATTRACT

COMBINE B. SPLIT C. REPRODUCE D. DIVIDE 7. WHEN 2 MAGNETS ARE BROUGHT CLOSE TO EACH OTHER, THEIR MAGNETIC FIELDS ________TO PRODUCE A NEW MAGNETIC FIELD. COMBINE B. SPLIT C. REPRODUCE D. DIVIDE 8. THE _______ POLE OF A COMPASS POINTS IN THE DIRECTION OF THE MAGNETIC FIELD. SOUTH B. NORTH C. EAST D. WEST 9. ONLY A FEW METALS, SUCH AS IRON, ______, OR NICKEL ARE ATTRACTED TO MAGNETS. A. HEMATITE B. SOLENOID C. ALUM D. COBALT

DOMAINS B. DOMICILES C. DOMES D. BUNCHES 10. GROUPS OF ATOMS WITH ALIGNED MAGNETIC POLES ARE CALLED MAGNETIC __________. DOMAINS B. DOMICILES C. DOMES D. BUNCHES 11. _________ HYPOTHESIZED THAT THE ELECTRIC CURRENT MUST PRODUCE A MAGNETIC FIELD AROUND THE WIRE, AND THE DIRECTION OF THE FIELD CHANGES WITH THE DIRECTION OF THE CURRENT VOLTA B. SHOCKLEY C. NEWTON D. OERSTED 12. A TEMPORARY MAGNET MADE BY WRAPPING A WIRE COIL CARRYING A CURRENT AROUND AN IRON CORE. A. MAGNETO B. ELECTROMAGNET C.ELECTRODOMAIN

ELECTROMAGNET B. DOMAIN C. SOLENOID D. CELL 13. A SINGLE WIRE WRAPPED INTO A CYLINDRICAL WIRE COIL IS CALLED A __________. ELECTROMAGNET B. DOMAIN C. SOLENOID D. CELL 14. ELECTROMAGNETS ARE TEMPORARY MAGNETS BECAUSE THE MAGNETIC FIELD IS PRESENT ONLY WHEN CURRENT IS FLOWING IN THE _______. DOMAIN B. CELL C. CIRCUIT D. SOLENOID 15. THESE ARE DEVICES THAT USE AN ELECTROMAGNET TO MEASURE ELECTRIC CURRENT. SOLENOID B. GALVANOMETERS C. CELLS D. CIRCUITMEASERS

16. A DEVICE THAT CHANGES ELECTRICAL ENERGY INTO MECHANICAL ENERGY. A.CIRCUIT MOTOR B. MECHANICAL MOTOR C. MANUAL MOTOR D. ELECTRIC MOTOR 17. THE GENERATION OF A CURRENT BY A CHANGING MAGNETIC FIELD IS ELECTROMAGNETIC ________. INDUCTION B. CONDUCTION C. GENERATOR 18. A _______ USES ELECTROMAGNETIC INDUCTION TO TRANSFORM MECHANICAL ENERGY INTO ELECTRICAL ENERGY. A. GENERATOR B. SOLENOID C. TURBINE D. CELL

19. A LARGE WHEEL THAT ROTATES WHEN PUSHED BY WATER, WIND, OR STEAM. A.GENERATOR B. CELL C. TURBINE D.SOLENOID 20. A BATTERY PRODUCES THIS TYPE OF CURRENT. A.INDIRECT B. CLOSED C. ALTERNATING D. DIRECT 21. WHEN YOU PLUG YOUR CD PLAYER INTO A WALL OUTLET, YOU ARE USING ______ CURRENT. A. INDIRECT B. CLOSED C. ALTERNATING D. DIRECT

ALTERNATOR B. GENERATOR C. TURBINE D. TRANSFORMER 22. A DEVICE THAT INCREASES OR DECREASES THE VOLTAGE OF AN ALTERNATING CURRENT. ALTERNATOR B. GENERATOR C. TURBINE D. TRANSFORMER 23. A TRANSFORMER THAT INCREASES THE VOLTAGE SO THAT THE OUTPUT VOLTAGE IS GREATER THAN THE INPUT VOLTAGE IS A _______ TRANSFORMER. A.STEP-DOWN B. STEP-UP C. NO-STEP D. CELL

A.STEP-DOWN B. STEP-UP C. NO-STEP D. CELL 24. A TRANSFORMER THAT DECREASES THE VOLTAGE SO THAT THE OUTPUT VOLTAGE IS LESS THAN THE INPUT VOLTAGE IS A _______ TRANSFORMER. A.STEP-DOWN B. STEP-UP C. NO-STEP D. CELL 25. ONE WAY TO REDUCE THE HEAT PRODUCED IN A POWER LINE IS TO TRANSMIT THE ELECTRICAL ENERGY AT HIGH VOLTAGES, TYPICALLY AROUND ____ VOLTS. 150,000 B. 15,000 C. 500,000 D. 10,000 BONUS/ESSAY QUESTION HOW DOES MUSICAL INFORMATION STORED ON A CD BECOME SOUND YOU CAN HEAR?

2. THE PROPERTIES AND INTERACTIONS OF MAGNETS IS CALLED _________. MORE THAN 2000 YEARS AGO GREEKS DISCOVERED DEPOSITS OF A MINERAL THAT WAS A NATURAL MAGNET CALLED _______. C. MAGNETITE 2. THE PROPERTIES AND INTERACTIONS OF MAGNETS IS CALLED _________. C. MAGNETISM 3. THIS EXERTS A FORCE ON OTHER MAGNETS AND OBJECTS MADE OF MAGNETIC MATERIALS. MAGNETIC FIELD

4. WHERE THE MAGNETIC FORCE EXERTED BY THE MAGNET IS STRONGEST. D. MAGNETIC POLE 5. NORTH AND SOUTH POLES OF MAGNETS ALWAYS _______ EACHOTHER. D. ATTRACT 6. 2 NORTH POLES AND 2 SOUTH POLES OF 2 MAGNETS _________ EACHOTHER. A. REPEL

7. WHEN 2 MAGNETS ARE BROUGHT CLOSE TO EACH OTHER, THEIR MAGNETIC FIELDS ________TO PRODUCE A NEW MAGNETIC FIELD. COMBINE 8. THE _______ POLE OF A COMPASS POINTS IN THE DIRECTION OF THE MAGNETIC FIELD. B. NORTH 9. ONLY A FEW METALS, SUCH AS IRON, ______, OR NICKEL ARE ATTRACTED TO MAGNETS. D. COBALT

10. GROUPS OF ATOMS WITH ALIGNED MAGNETIC POLES ARE CALLED MAGNETIC __________. DOMAINS 11. _________ HYPOTHESIZED THAT THE ELECTRIC CURRENT MUST PRODUCE A MAGNETIC FIELD AROUND THE WIRE, AND THE DIRECTION OF THE FIELD CHANGES WITH THE DIRECTION OF THE CURRENT D. OERSTED 12. A TEMPORARY MAGNET MADE BY WRAPPING A WIRE COIL CARRYING A CURRENT AROUND AN IRON CORE. B. ELECTROMAGNET

13. A SINGLE WIRE WRAPPED INTO A CYLINDRICAL WIRE COIL IS CALLED A __________. C. SOLENOID 14. ELECTROMAGNETS ARE TEMPORARY MAGNETS BECAUSE THE MAGNETIC FIELD IS PRESENT ONLY WHEN CURRENT IS FLOWING IN THE _______. D. SOLENOID 15. THESE ARE DEVICES THAT USE AN ELECTROMAGNET TO MEASURE ELECTRIC CURRENT. B. GALVANOMETERS

16. A DEVICE THAT CHANGES ELECTRICAL ENERGY INTO MECHANICAL ENERGY. D. ELECTRIC MOTOR 17. THE GENERATION OF A CURRENT BY A CHANGING MAGNETIC FIELD IS ELECTROMAGNETIC ________. INDUCTION 18. A _______ USES ELECTROMAGNETIC INDUCTION TO TRANSFORM MECHANICAL ENERGY INTO ELECTRICAL ENERGY. A. GENERATOR

19. A LARGE WHEEL THAT ROTATES WHEN PUSHED BY WATER, WIND, OR STEAM. C. TURBINE 20. A BATTERY PRODUCES THIS TYPE OF CURRENT. C. D. DIRECT 21. WHEN YOU PLUG YOUR CD PLAYER INTO A WALL OUTLET, YOU ARE USING ______ CURRENT. C. ALTERNATING

22. A DEVICE THAT INCREASES OR DECREASES THE VOLTAGE OF AN ALTERNATING CURRENT. D. TRANSFORMER 23. A TRANSFORMER THAT INCREASES THE VOLTAGE SO THAT THE OUTPUT VOLTAGE IS GREATER THAN THE INPUT VOLTAGE IS A _______ TRANSFORMER. B. STEP-UP

HOW DOES MUSICAL INFORMATION STORED ON A CD BECOME SOUND YOU CAN HEAR? 24. A TRANSFORMER THAT DECREASES THE VOLTAGE SO THAT THE OUTPUT VOLTAGE IS LESS THAN THE INPUT VOLTAGE IS A _______ TRANSFORMER. A.STEP-DOWN 25. ONE WAY TO REDUCE THE HEAT PRODUCED IN A POWER LINE IS TO TRANSMIT THE ELECTRICAL ENERGY AT HIGH VOLTAGES, TYPICALLY AROUND ____ VOLTS. 150,000 BONUS/ESSAY QUESTION HOW DOES MUSICAL INFORMATION STORED ON A CD BECOME SOUND YOU CAN HEAR?