Download Physical Science Test Electromagnetism Multiple Choice 1

Physical Science Test Electromagnetism
Multiple Choice
1. Materials that allow the charges of an electric current to move freely through them are called
A. conductors.
B. resistors.
C. insulators.
D. magnets.
2. According to Ohm’s law, what is the resistance of a light if the voltage is 9.0 volts and the
current is 0.30 amps?
A. 2.7 ohms.
B. 30 ohms.
C. 0.033 ohms.
D. 8.7 ohms.
3. An electric current produces a(n)
A. electrical resistance.
C. permanent magnet.
B. magnetic field.
D. magnetic domain.
4. Which compass needle orientation in the figure above might correctly describe the magnet’s
field at that point?
A. d
B. c
C. b
D. a
5. Three resistors with values of 4.0 W, 6.0 W, and 10.0 W are connected in parallel. What is
their equivalent resistance?
A. 6.0 W
B. 7.3 W
C. 20.0 W
D. 1.9 W
6. Will the magnets in the figure above attract or repel each other?
A. Repel
B. Attract
7. What type of transformer is transformer B?
A. Step-down
B. Step-up
8. What type of transformer is transformer A?
A. Step-down
B. Step-up
Concept Review
Use the diagram below to complete the following.
9. If the battery is a 9-volt battery and the resistance in the circuit is 18 ohms, how much current
is flowing through the circuit?
A. 27 A
B. 162 A
C. 0.5 A
D. 2 A
10. The buildup of charges on an object is called
A. positive charge
B. static electrity
C. negative charge
D. static discharge
11. Will removing bulb 1 in circuit B cause bulb 3 to go out?
A. No
B. Yes
12. Which circuit diagram represents circuit B?
A. C
B. D
C. E
13. Which circuit—A or B—represents a series circuit?
A. B
B. A
14. What will happen to bulb 1 in circuit A if the switch is opened?
A. Stay on
B. Turn off
15. Which circuit—A or B—is a parallel circuit?
A. B
B. A
16. What will happen to bulb 2 in circuit diagram D if bulb 1 burns out?
A. Go off
B. Stay on
17. An electric generator is the opposite of a(n)
A. AC generator.
C. electric motor.
B. electric current.
D. DC generator.
18. Lightning is ____.
A. a buildup of neutrons
B. a large discharge of static electricity
C. harmless
D. a high-voltage electric current
19. Which diagram best illustrates the orientation of the magnetic domains in the object shown
below? Assume the darker shading on the needles is the north pole.
A.
C.
B.
D.
20. The magnetic field of a bar magnet is shown in the figure above. Is the magnet’s north pole at
A or B?
A. A
B. B
21. In the United States, power lines can carry power voltages as high as 750,000 V, a step-down
transformer reduces the voltage to ____ for home use.
A. 60 V
B. 60 Hz
C. 120 V
D. 120 Hz
22. What happens if you break a magnet in half?
A. Each half will be a new magnet, with both a north and a south pole.
B. One half will have a north pole only and one half will have a south pole
only.
C. Neither half will have a pole.
D. Neither half will be able to attract or repel.
23. A device that uses electrical energy as it interferes with the flow of charge is a(n)
A. conductor.
C. resistor.
B. superconductor.
D. insulator.
24. What is a disadvantage of using fuses?
A. A fuse uses an electromagnet, so it shuts off when the current gets too
high.
B. Compared with circuit breakers, fuses are a newer, easier way to protect
circuits.
C. You cannot blow a fuse by plugging in too many appliances at once.
D. When a fuse burns out, it cannot be used again.
25. How much energy will the bulb use in 1 h?
A. 16,000 J
B. 2,700 J
C. 4.5 J
D. 5.5 J
26. How much power is delivered to the lightbulb?
A. 4.5 W
B. 8.5 W
C. 18 W
D. 9.5 W
27. An alternating current
A. reverses direction repeatedly.
B. flows in one direction in some devices and changes direction in others.
C. flows in one direction only.
D. turns on and off repeatedly.
28. Every magnet, regardless of its shape, has two
A. magnetic domains.
C. magnetic charges.
B. magnetic fields.
D. magnetic poles.
29. Superconductors are not commonly used because they
A. have a high electrical resistance.
B. are inefficient.
C. require very low temperatures.
D. lose energy as current flows through them.
30. Three resistors with values of 4.0 W, 6.0 W, and 8.0 W, respectively, are connected in series.
What is their equivalent resistance?
A. 18W
B. 6.0W
C. 8.0W
D. 1.8W
31. Which magnetic pole is at the geographic North Pole of Earth?
A. North Magnetic Pole
B. South Magnetic Pole
32. In the schematic diagram above, will there be a current?
A. Yes
B. NO
33. Will the magnets in the figure above attract or repel each other?
A. Attract
B. Repel