Both have North and South Poles; both have magnetic field
15
The compass needle is free to turn to point north-south because ______
the Earth has a magnetic field.
25
Name 2 kinds of noise pollution and give examples for each kind.
Natural and artificial noise pollution.
25
Magnets can attract iron nail. True or false?
True
10
Which medium is glass? Why? (A/B/C/D)
D
20
Compare the speed of sound in vacuum, solid, liquid, and gas.
Vacuum (=0) < Gas < Liquid < Solid
15
If the north pole is placed with the north pole of another magnet, they will repel. True or false?
True
15
Is the upper side of the compass South, North, East, or West?
North
10
A magnet is an object that produces a magnetic field. True or false?
True
15
Draw the magnetic field lines with their direction to describe the difference between magnetic fields of a bar magnet and a U-shaped (horseshoe) magnet.
25
Which does cause sound? How does sound travel?
Vibration causes sound. Sound travels though sound waves.
