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Ch. 17 Review
Test Description: Review questions for Ch. 17
Instructions: Answer all questions to get your test result.
1) How can you make the magnetic field of an electromagnet stronger?
A
Use a horseshoe magnet
B
quickly turn the electromagnet of and off
C
add more coils around the magnet
D
place a rubber core into the coil of wire
2) Which device changes mechanical energy into electrical energy?
A
electromagnet
B
electric motor
C
solar cell
D
generator
3) What causes an alternating current in a generator?
A
magnets pushing against each other
B
the speed a coil goes on and off
C
the size of the magnet's iron core
D
the spinning of a coil
4) Energy stored in the bonds between atoms is
A
electrical energy
B
thermal energy
C
kinetic energy
D
chemical energy
5) What kind of energy is stored in a gas pump?
A
mechanical energy
B
thermal energy
C
kinetic energy
D
chemical energy
6) On a magnet, where is the magnetic field the strongest?
A
at both poles
B
in the middle
C
at the south pole
D
at the north pole
7) Why does a machine with moving parts give off heat?
A
Friction causes mechanical energy to change to thermal energy
B
Friction causes electrical energy to change to thermal energy
C
Energy is gained as the temperature increases
D
Energy is lost as the parts move
8) What produces an electric current?
A
energy gain from a magnetic field
B
a stable magnetic field
C
a changing magnetic field
D
energy loss from a magnetic field
9) What causes Earth to act like a magnet?
A
the lack of metals around the equator
B
the movement of hot, liquid metal inside Earth
C
the shifting tectonic plates
D
iron ore deposits at the North and South Pole
10) Kinetic energy and potential energy are both types of
A
solar energy
B
electrical energy
C
chemical energy
D
mechanical energy
11) If you break a bar magnet in half, what happens to the magnetic domain?
A
The magnetic domain disappears
B
You get one North magnet and one South magnet
C
You have two smaller magnets, each with a North and South
D
You can't break a magnet
12) When you drop a ball to the floor, what happens to the energy in the ball?
A
the energy is gained by the air and the floor
B
the energy stays in the ball as it drops
C
energy is made and goes to the air and the floor
D
most of the energy is destroyed
*select an answer for all questions
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