Question:

Quick physical science help?

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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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2 ANSWERS


  1. 1.

    2. They're probably looking for '2' but the real answer is 1, 2 or 4 etc

    3. The Earth is a large magnet with a magnetic pole near the North Pole\

    4. The pattern of a magnetic field

    5. The molecular arrangement diminishes the magnetic response

    6. an unmagnetized piece of nickel.

    7.

    8. Sound

    9. They are completely different things

    10. Is a really really stupid question

    11. An echo

    12. It goes slower than in air

    13. Sound is a waveform in matter, and there is no matter in a vacuum (though i really think you should answer no. 3 because it's funny)

    14.Air from your lungs passes over the vibrating vocal chords, making sound



    15. The air is circulating in the bottle causing the bottle to vibrate.

    16. 881 Hz

    17. Not much sound reflects directly back to you

    18. Red hot wire

    19. diverging... maybe

    20. radio waves


  2. i can answer some.. i guess it's a start. they aren't in order sorry.

    20 is ultra sonic

    6 is the nickel

    4 ironfilings show magnetic field patterns

    18 is the red hot wire

    14 vocal chords vibrate

    9 they're both in the elctromagnetic specrum

    2 is 2 i think. google that

    that's all i know off the top of my head =]

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