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HIA International — Grade 8

Unit 1: Photosynthesis and the carbon cycle

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Unit 2: Properties of materials

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Unit 3: Forces and energy

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Unit 4: Maintaining life

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Unit 5: Reactivity

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Unit 6: Sound and space

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Unit 7: Genes and inheritance

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Unit 8: Rates of reaction

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Unit 9: Electricity

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Quiz

Checkpoint Grade 8 Unit 6 – 6.2 Reflections Of Sound

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Reflections Of Sound Checkpoint Earth and Space quiz set 2: free practice for Cambridge Checkpoint Earth And Space 0893. Work through this Reflections Of Sound Checkpoint Earth and Space quiz set 2 and get instant feedback on every answer. If you get stuck, review the 5.2 Reflections of sound lesson. More practice: Cambridge Checkpoint Earth And Space 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
Which statement correctly describes sound?
sent back from a surface
not useful or intended
energy transferred by vibrations through a medium
a reflected sound heard after the original
2.
Which statement correctly describes reflected?
energy transferred by vibrations through a medium
a reflected sound heard after the original
not useful or intended
sent back from a surface
3.
Which statement correctly describes echo?
energy transferred by vibrations through a medium
sent back from a surface
not useful or intended
a reflected sound heard after the original
4.
Which statement correctly describes unwanted?
energy transferred by vibrations through a medium
sent back from a surface
a reflected sound heard after the original
not useful or intended
5.
Which of these is the FIRST step in the correct order?
the wave reaches a surface
an echo reaches the listener
sound leaves the source
the wave is reflected
6.
Which step comes immediately after "the wave reaches a surface"?
sound leaves the source
an echo reaches the listener
the wave is reflected
7.
Which practical work belongs to Reflections Of Sound?
Use particle models and demonstrations to compare sound through different media
Relate plate-boundary movement to earthquakes, subduction, volcanoes and fold mountains
Interpret cross-sections and use matching evidence such as fossils, rocks and coastline patterns
Model echoes and apply reflection ideas to echolocation and room acoustics
8.
Sofia investigates the reflection of sound using the set-up shown. Why has she placed a block of soft sponge between the two tubes?
Dr Dabour Hub Academy - figure 1
So the ticking reflects more strongly from the sponge into tube B
So the sound speeds up as it travels through the tubes to the board
So sound cannot reach tube B directly, only by reflecting from the board
So the watch ticks at a higher pitch that is easier to hear
9.
A car reversing towards a wall uses an ultrasound parking sensor, as shown. How far is the back of the car from the wall?
Dr Dabour Hub Academy - figure 2
1.36 m from the wall
0.68 m from the wall
85 m from the wall
0.34 m from the wall
10.
The diagram shows a side view of a concert hall. Why are hard, angled panels hung above the stage, while the back wall is covered with soft panels?
Dr Dabour Hub Academy - figure 3
The panels reflect sound to the seats; the back wall stops echoes
The panels absorb the orchestra; the back wall reflects sound
The panels make the music louder by raising its frequency
Both are there only to stop sound leaving through the roof
11.
Maryam lines a box containing a buzzer with foam of different thicknesses and measures the sound level outside. She wants the level to be 60 dB using as little foam as possible. Using her graph, what thickness should she use?
Dr Dabour Hub Academy - figure 4
About 2 cm of foam
About 10 cm of foam
About 8 cm of foam
About 5 cm of foam
12.
Before radar was invented, huge concrete "sound mirrors" like the one shown were built to detect aircraft. Why was the dish made of hard, smooth concrete?
Dr Dabour Hub Academy - figure 5
Concrete absorbs sound, so only the aircraft noise is left
Concrete speeds up sound so it reaches the microphone first
Hard, smooth surfaces reflect sound well towards the microphone
Concrete turns the aircraft noise into ultrasound for detection
13.
Four students each shout into a deep well (diagram) and record the time until the echo from the water returns (table). Dara's microphone was pointing the wrong way. Using the speed of sound in air as 340 m/s, what is the best estimate of the depth to the water?
Dr Dabour Hub Academy - figure 6
About 21 m deep
About 42 m deep
About 24 m deep
About 2.8 m deep
14.
A hospital technician tests an ultrasound probe on a model body made of jelly layers (diagram). Using the echo times in the table, how far below the skin surface is boundary Q?
Dr Dabour Hub Academy - figure 7
12 cm below the skin
0.6 cm below the skin
120 cm below the skin
6.0 cm below the skin
15.
The submarine keeps moving straight towards the iceberg at 10 m/s. What echo time would its sonar record from the iceberg 100 s later?
About 3.9 s
About 2.7 s
About 1.3 s
About 5.3 s
16.
A school must absorb at least half of the sound hitting the walls of its music room and wants to spend as little as possible. Using the table, which covering is the best choice?
Heavy curtains
Acoustic foam panels
Thin carpet tiles
Painted brick (no covering)
17.
Leila measures echo times across a lake. Point D lies above a thick bed of soft water-weed. Which statement is correct?
A is deepest; the soft weed at D absorbed the pulse
C is deepest; the weed at D reflected the pulse too fast to time
C is deepest; the soft weed at D absorbed the pulse
D is deepest; sound cannot travel that far through water
18.
Josh wants to find out how the thickness of a lining affects the sound level inside an ear defender cup. Which two tests should he compare?
Tests 2 and 3
Tests 1 and 4
Tests 3 and 4
Tests 1 and 2
19.
Sofia repeats her reflection experiment for different angles of tube A. Which statement correctly describes her results?
The 20° result is anomalous; otherwise tube B is always 10° larger
The 50° result is anomalous; otherwise the two angles are about equal
There is no pattern, as the angles are never exactly the same
Tube B is always about twice the angle of tube A
20.
Theo stands 20 m from a large wall. A datalogger records his clap and its echo 0.12 s apart. What value does this give for the speed of sound?
About 167 m/s
About 2.4 m/s
About 0.012 m/s
About 333 m/s
21.
A ship's sonar sends out short pulses with gaps between them, rather than one continuous sound. Why?
So each echo can be detected and timed before the next pulse
So the sound can travel faster through the water in each gap
So the seabed has time to cool down between reflections
So the echoes become higher in pitch and easier to hear
22.
Many long road tunnels have their walls lined with special panels. Drivers in lined tunnels hear far less noise. What do the panels most likely do?
Reflect sound back to each car to make engines quieter
Speed up sound so it leaves the tunnel more quickly
Absorb sound, so less is reflected along the tunnel
Change the traffic noise into ultrasound that is not heard
23.
Farid shouts towards a cliff and hears the echo, but the echo is quieter than his shout. What is the best explanation?
The echo travels more slowly, so it loses its loudness
Some sound energy is absorbed by the cliff and the air
The cliff reflects the sound at a much lower frequency
Only the highest-pitched part of the shout is reflected
24.
Aroha wants to measure the depth of a flooded quarry at several places using a waterproof speaker, a microphone and a datalogger. Which plan is best?
Time each echo, find depth = 1500 × time ÷ 2, and repeat at each place for a mean
Time one echo, then find depth = 1500 × time for the whole quarry
Time each echo, find depth = 340 × time ÷ 2, and repeat for a mean
Shout from the edge and time the echo from the far side of the quarry
25.
Some blind people learn to click their tongue and listen to the echoes to move around safely. What tells them how far away a wall is?
How high the pitch of the click is
How long each click lasts for
Whether they click with the mouth open
How long after the click the echo returns
26.
An engineer sets a ship's echo sounder to use the speed of sound in air (340 m/s) by mistake. How will the depths it shows compare with the real depths?
Far too large, as sound in water is about 4.4 times slower
Far too small, as sound in water is about 4.4 times faster
Exactly right, as the echo time is the same in any medium
Slightly too small, as only the time needs to be halved
27.
The sonar transmitter on a ship is fitted to the bottom of the hull under the water, not on the mast. Which is the best reason?
Sound travels slower in water, so timing is easier
Sound cannot travel through the air at all
The pulse must travel through water to reach the seabed
The mast would absorb the pulse like a curtain
28.
Each application is paired with what it uses. Which pairing is correct?
Bat hunting – light reflected from moths
Hospital scanner – echoes of ultrasound
Ship sonar – radio waves reflected from the seabed
Parking sensor – the sound of the car engine
29.
Each change is paired with its effect on the time for an echo to return. Which pairing is correct?
Stand further from the cliff – the echo time increases
Shout more loudly – the echo time decreases
Use water instead of air – the echo time increases
Whistle a higher note – the echo time halves
30.
Each quantity is paired with how to calculate it from an echo. Which pairing is correct?
Speed of sound – distance × echo time
Echo time – depth × speed
Distance to wall – speed ÷ echo time
Depth of sea – speed × echo time ÷ 2
31.
Each term is paired with an example. Which pairing is correct?
Reflection – thick curtains soaking up music
Echolocation – a microphone recording a song
Absorption – foam panels taking in sound in a studio
Sonar – a speaker playing in a sports hall
32.
Which term is described as: energy transferred by vibrations through a medium?
reflected
unwanted
sound
echo
33.
Which term is described as: sent back from a surface?
sound
unwanted
reflected
echo
34.
Which term is described as: a reflected sound heard after the original?
sound
reflected
unwanted
echo
35.
Which term is described as: not useful or intended?
sound
reflected
echo
unwanted
36.
When sound reflects from a flat, hard board, the angle of reflection is _____ the angle at which the sound hits the board.
equal to
double that of
always smaller than
unrelated to
37.
Sonar is used in the sea, where sound travels at about _____.
340 m/s in air
5000 m/s
1500 m/s
15 m/s only
38.
Nour whistles towards a cliff and hears the echo 0.60 s later. Taking the speed of sound as 340 m/s, the cliff is _____ away.
204 metres
102 metres
567 metres
51 metres
39.
After heavy snowfall a town sounds very quiet, because the soft, airy snow _____ that hits it.
reflects all of the sound
speeds up all the sound
raises the pitch of sound
absorbs much of the sound
40.
A large glass window reflects sound well because it is hard and smooth. True or false?
False – glass absorbs sound because it is see-through
False – sound passes straight through all glass
True – but only while light is shining on it
True – hard, smooth surfaces reflect sound well
41.
A reversing car's parking sensor uses ultrasound, so the beeping the driver hears is the ultrasound pulse itself. True or false?
True – the beep is the pulse returning to the car
False – ultrasound is too high for anyone to hear
True – ultrasound is simply a very loud beep
False – the sensor uses light, not sound
42.
If sound travelled faster in air, the echo from the same cliff would return sooner. True or false?
True – the same distance would take less time
False – echo time depends only on the distance
False – a faster sound would return later
True – but only if the cliff were also closer
43.
A ship's sonar can measure the depth of the sea at night as well as during the day. True or false?
False – sonar needs sunlight to see the seabed
False – sound cannot travel through cold water
True – it uses sound echoes, not light
True – but only when the sea is calm and clear
44.
An echo from a cliff has a higher pitch than the shout that made it. True or false?
False – it has the same pitch but is quieter
True – reflection raises the frequency of sound
True – echoes are always ultrasound
False – the echo has a lower pitch instead
45.
Carpets reduce echoes in a room because their soft, fibrous surface absorbs much of the sound that hits it. True or false?
False – carpets reflect more sound than bare floors
False – carpets only reduce echoes by trapping heat
True – but only if the carpet is a dark colour
True – soft, rough surfaces absorb sound
46.
Echoes can only be produced by sound travelling in air. True or false?
True – liquids and solids absorb every sound
True – sound cannot reflect inside a liquid
False – sonar and scans use echoes in water and the body
False – echoes can also happen in a vacuum
47.
A bat hunting insects and a ship finding the depth of the sea both work by timing how long reflected sound takes to return. True or false?
False – bats use light and ships use sound
True – both use echoes to work out distance
False – ships use echoes but bats use smell
True – but only the ship uses reflected sound
48.
When foam absorbs sound, the sound energy is destroyed and goes nowhere. True or false?
True – absorbed sound simply disappears for ever
True – foam turns sound into nothing at all
False – the energy is all reflected back instead
False – the energy is transferred to the foam
49.
Footsteps sound louder in a corridor with a hard tiled floor than in one with thick carpet, because more sound is reflected. True or false?
False – carpet reflects more sound than tiles do
False – the floor makes no difference to loudness
True – tiles reflect sound; carpet absorbs it
True – but only because tiles make feet heavier
50.
A cinema is fitted with soft seats and fabric wall panels so that the film's dialogue sounds clearer. True or false?
False – soft materials make reflections louder
True – soft materials cut reflected sound
False – fabric panels only improve the picture
True – but only because the seats block the screen
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Part of Unit 6: Sound and space — see every lesson and quiz in this unit.
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