Direction: Read each item carefully then write the letter of your answer on the blank before each number.
1._______is a temporary magnet that uses electricity.
A. u shape magnet
B. bar magnet
C. permanent magnet
D. electromagnet
2. The parts of an electromagnet are wire, power source and ______.
A. bulb
B. core
C. pins
D. metal
3. What will affect the strength of an electromagnet in the following set up.
A coils of wire
B. core material
C. diameter of dry cell
D size of material
4. If you wrap more coils around an electromagnet, it will become _______.
A brighter
B. stronger
C. weaker
D. Invisible
5. What kind of magnet can be tumed on and off? (Man made magnet).
A. refrigerator magnet
B. electromagnet
C. magnetite
D. Iron
6. How are electromagnets different from magnets?
A. magnets can be tumed on/off
B. you can turn an electromagnet on/off
C. magnets are more powerful
D. magnets have a North and South pole magnets
7. What is most likely to happen when the switch is on in this set up?
A. The nail will attract metals
C. The wire will catch on fire
B. The battery will explode
D. The nail will rust
8. What must happen for an electromagnet to have a magnetic field?
A It must be heated.
B. It has to be touching another magnet
C. It must be lined up with Earth's magnetic field
D. It must be connected to an electrical source.
9. What is most likely to happen when the switch is off in this set up?
C. The parts will be disconnected
D. The nail will rust
A The nail will attract more metals.
B. The nail will not attract any metal
10. Electromagnets are _______ magnets.
A bar
B. u-shaped
C. permanent
D.temporary
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Answer:
A
a
a
b
d
c
d
d
c
d
Explanation:
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