Electricity Magnetism Test Review W-Key | PDF | Electric Current ... - Free Printable

Let’s go through each question one by one. I’ll explain the correct answer and why the others are wrong — in simple terms, like we’re studying together.

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Modified True/False

1. A conductor is a material that doesn’t allow electrons to flow through it easily.
→ FALSE. A conductor *does* allow electrons to flow easily (like copper wire). The word “doesn’t” should be changed to “does”.
✔ Corrected: A conductor is a material that does allow electrons to flow through it easily.

2. A lightning bolt occurs when billions of protons are transferred at the same time.
→ FALSE. Lightning happens when electrons move, not protons. Protons stay in the nucleus; electrons jump around.
✔ Corrected: A lightning bolt occurs when billions of electrons are transferred at the same time.

3. The rearrangement of electrons on a neutral object caused by a nearby charged object is called charging by induction.
→ TRUE. That’s exactly what induction means — no contact needed, just influence from a nearby charge.

4. Voltage difference is measured in amperes.
→ FALSE. Voltage is measured in volts. Amperes measure current.
✔ Corrected: Voltage difference is measured in volts.

5. The unit used to measure current is the volt.
→ FALSE. Current is measured in amperes (or amps). Volt is for voltage.
✔ Corrected: The unit used to measure current is the ampere.

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Multiple Choice

6. Which device opens an overloaded circuit?
→ a. circuit breaker — yes! It trips when too much current flows. Magnet, resistor, transformer don’t do this automatically.

7. Current that does NOT reverse direction?
→ c. direct current — DC goes one way only. AC reverses. “Circuit current” and “magnetic current” aren’t real terms here.

8. Strongest magnetic forces location?
→ d. magnetic poles — north and south poles have strongest pull. Domains are tiny regions inside magnets. Fields are the area around. Electromagnets are devices.

9. Current that reverses direction regularly?
→ a. alternating current — AC flips back and forth. DC doesn’t. Again, “circuit” and “magnetic” current aren’t standard terms for this.

10. Region around magnet where force acts?
→ c. magnetic field — that’s the definition. Poles are points. Domains are internal. Electromagnetic isn’t right here.

11. Objects that keep magnetism long-term?
→ c. permanent magnets — like fridge magnets. Temporary lose it fast. Electromagnets need electricity. Domains are parts inside.

12. Electric motor function?
→ c. electrical energy to mechanical energy — motors use electricity to make things spin or move. Generators do the opposite.

13. Generator function?
→ d. mechanical energy to electrical energy — you turn it (mechanical), it makes electricity. Motor is the reverse.

14. What does electric circuit carry?
→ d. electrical energy — circuits move electrical energy from source to device. Not chemical, thermal, or mechanical directly.

15. Repulsive force between two charged objects when?
→ c. charges are of like sign — same charges repel (+/+ or -/-). Opposite attract.

16. Attractive force between two charged objects when?
→ a. charges are of unlike sign — positive and negative attract. Like signs repel.

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Final Answer:

Modified True/False:
1. False → change “doesn’t” to “does”
2. False → change “protons” to “electrons”
3. True
4. False → change “amperes” to “volts”
5. False → change “volt” to “ampere”

Multiple Choice:
6. a
7. c
8. d
9. a
10. c
11. c
12. c
13. d
14. d
15. c
16. a