Sound

Sound is produced when an object
1. vibrates
2. heats up
3. cools down
4. changes state
The experiment shown shows that sound can be converted into
1. kinetic energy
2. heat energy
3. light energy
4. potential energy
When you speak into a phone, which one of the following energy conversions takes place?
1. Sound to electrical
2. Sound to light
3. Sound to kinetic
4. Electrical to sound
A loudspeaker converts
1. electrical energy to sound energy
2. electrical energy to light energy
3. light energy to sound energy
4. kinetic energy to sound energy
The speed of sound in air is approximately
1. 340 m/s
2. 300,000,000 m/s
3. 0.001 m/s
4. 1 m/s
Which one of the following statements is correct?
1. Sound travels faster through water than it does through air
2. Sound travels fastest through a vacuum
3. Sound travels faster than light
4. Sound travels slower through water than it does through air
The diagram shows an apparatus commonly found in science laboratories.
This apparatus demonstrates that
1. sound requires a medium
2. sound does not travel through air
3. sound travels fastest when travelling through air
4. the bell sounds very loud in a vacuum
Sound waves cannot travel through
1. a vacuum
2. solids
3. liquids
4. gases
Which one of the following creatures finds its way in the dark using a method called echolocation?
1. Bats
2. Cats
3. Snakes
4. Dolphins
The effect that occurs when an aircraft travels faster than the speed of sound is called
1. sonic boom
2. sonic the hedgehog
3. ultrasonic
4. supersonic
A boy sees a lightning flash five seconds before he hears its corresponding thunder.
How far away is the lightning approximately?
1. 1,700 metres
2. Immediately above the boy
3. 100 metres
4. 500 metres
The unit of sound level is the
1. decibel
2. newton
3. watt
4. joule
Brian claps his hands in front of a cliff, and hears the echo 2 seconds later. If the speed of sound is equal to 330 m/s, how far away is the cliff?
1. 330 m
2. 165 m
3. 660 m
4. 600 m
Which one of the following animals uses ultrasound?
1. Bats
2. Whales
3. Cats
4. Tigers
In which of the following places are you likely to hear the most echoes?
1. An empty sports hall
2. A crowded sports hall
3. A theatre full of people
4. A small, well furnished living room
The method by which ships determine the ocean depth is called
1. echo sounding
2. transmission
3. oceanography
4. vacuum sounding
Where is sound most likely to travel at its fastest?
1. Solids
2. Liquids
3. Gases
4. Vacuum
Which one of the following gives us most protection against noise pollution?
1. Ear protectors
2. Lab coat
3. Cotton wool
4. Safety spectacles
Ultrasound has many uses. Which one of the following is NOT one of these uses?
1. Mobile phone masts
2. Cleaning equipment
3. Pre-natal scanning
4. Range finding at sea
An echo is a repeated sound often heard when shouting near a cliff.
What causes an echo?
1. The reflection of sound
2. The refraction of sound
3. The dispersion of sound
4. The breaking up of sound
Sound travels fastest in
1. steel
2. vacuum
3. water
4. air
On a certain day, the speed of sound in air is 330 m/s.
A girl stands in front of a cliff and shouts. She hears her echo six seconds later.
Approximately how far away is the cliff?
1. 1 kilometre
2. 2 kilometres
3. 55 metres
4. 25 metres
The table shows some examples of the sound levels given off by various objects.
When should ear protection be worn?
1. Above 85 dB
2. Above 100 dB
3. Below 50 dB
4. Between 60 and 120 dB
Lightning occurs five kilometres away from a village.
If the speed of sound is 330 m/s, approximately, how long will it take a person in this village to hear the thunder?
1. 15 seconds
2. 5 seconds
3. 1,650 seconds
4. Immediately
A newly built classroom has problems with sound echoes.
A number of suggestions were made to reduce the echoes occurring.
Which one of the following would NOT help reduce the echoes?
1. Add more glass windows
2. Put heavy curtains on each window
3. Carpet the room
4. Add a foam ceiling
Echo-sounding is used on ships for:
1. measuring the depth of the seabed
2. predicting the weather
3. keeping the ship steady during high seas
4. preventing seasickness
The speed of sound in water is 1500 m/s. Using echo-location, a ship sends a sound down to the seabed. The sound is reflected and heard eight seconds later.
How deep is the water?
1. 6,000 m
2. 600 m
3. 12,000 m
4. 120 m
Another term for “zero decibels” is
1. the threshold of hearing
2. sound intensity
3. ultrasound
4. sonogram
When astronauts landed on the moon, they could not hear the sound of their craft striking the lunar surface.
Why could they not hear this sound?
1. There is no air on the moon.
2. Human ears do not work on the moon.
3. Their space suits were too thick to allow sound in.
4. They wore ear protection so they would not go deaf with the loud sound made on landing.
In our ear, sound is detected by the _______ which vibrates. These vibrations are picked up by ________ which travels by electrical signals to the_____.
What are the missing words (in their correct order)?
1. eardrum, nerves and brain
2. nerves, eardrum and brain
3. brain, nerves and eardrum
4. eardrum, ear and brain
Which part of the diagram shown is the eardrum?
1. B
2. A
3. C
4. D
Echoes are produced when
1. sound waves reflect off a body
2. the eardrum vibrates
3. sound is absorbed by a material
4. lightning strikes during a thunderstorm

Sound

Multiple Choice Quiz