1: Why wouldn't carbon-hardened steel be very magnetic?
It is too hard to be attracted to a magnet
Liquids cannot be magnets
Carbon is diamagnetic, thus neutralizing the ferromagnetic steel
2: How many poles can a magnet have?
1
2
3
3: Why does a compass point north?
The shape of the Earth causes it
There is a large deposit of iron right at the North Pole
The Earth is a large magnet with a magnetic pole near the North Pole
4: What do iron filings show?
Which direction is north
If there is a compass nearby
The pattern of a magnetic field
5: Why isn't rusty iron attracted to magnets very well?
Rust is too heavy
The molecular arrangement diminishes the magnetic response
There is too much water in rust
6: Of the following, the one that will be attracted by either pole of a bar magnet is
an unmagnetized piece of nickel.
the S pole of another bar magnet.
bits of broken glass.
7: A magnetized needle free to pivot in any direction will come to rest in a horizontal position when at
a place about midway between the North and South Magnetic Poles
the North Magnetic Pole.
a place about 1,500 miles from the North Magnetic Pole.
8: The study of waves applies to what other subject?
Lightening
Chemistry
Sound
9: How are radio waves and visible light similar?
Both are electromagnetic waves
Both are stopped by colored glass
They are completely different things
10: What is the amplitude of thunder?
Loudness
Brightness
Pulses don't have amplitude
11: What do they call sound reflected off a distant wall?
Sound cannot be reflected
Wave motion
An echo
12: What happens to the speed of light in glass?
It becomes the speed of sound
It goes faster than in air
It goes slower than in air
13: Why doesn't sound travel through a vacuum?
Sound is a waveform in matter, and there is no matter in a vacuum
Vacuums absorb most of the sound
It does travel in space, as verified on Star Trek
14: How do you make sounds from your vocal chords?
Vocal chords act like tiny loudspeakers, vibrating and forcing sound out your mouth
Air from your lungs passes over the vibrating vocal chords, making sound
It is a myth that your sound comes from vocal chords; it comes from your chest
15: When you blow across the top of a bottle and hear a sound, what is causing the sound being made?
The air is circulating in the bottle causing the bottle to vibrate.
The bottle becomes a vacuum.
The bottle becomes a small speaker allowing you to hear any sounds around you.
16: What would the beat frequency be if you added tones of 880 Hz and 882 Hz?
2 Hz
881 Hz
1762 HZ
17: Why can't you hear an echo from curved wall?
Not much sound reflects directly back to you
The sound is diffracted
Curved surfaces absorb the sound
18: Of the following, the only object that would be visible in a perfectly dark room would be
a mirror.
any light-colored surface
a red hot wire.
19: The shadow of a cloud on the ground is the same size and shape as the cloud itself because the sun's rays are
practically parallel
highly diverging
not very numerous.
20: Which is NOT an electromagnetic wave?
visible
radio waves
ultra sonic
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