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Course: Alhussan Physics — Stage 7
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Alhussan Physics — Stage 7

Chapter 1: Energy

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Chapter 2: Forces

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Chapter 3: Sound

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Chapter 4: Electricity

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Chapter 5: The Earth in Space

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Quiz

Physics 3.3 Echoes — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
True or false? Soft surfaces absorb sound.
True
False
2.
A cliff is 85 m away. Echo time? (340 m/s)
28900.0 s
0.2 s
4.0 s
0.5 s
3.
Sea depth measured by sonar along a route. Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 1
"Depth (m)" decreases as "Distance from shore (km)" increases
"Depth (m)" increases as "Distance from shore (km)" increases
"Depth (m)" falls to a minimum at 0, then rises
"Depth (m)" rises to a peak at 25, then falls
4.
The graph shows echo times measured by sonar along a ship's route. Where is the sea deepest?
Dr Dabour Hub Academy - figure 2
P
Q
R
S
5.
True or false? Echoes arrive instantly.
True
False
6.
Which statement is NOT correct?
Ultrasound scans show babies in the womb.
Carpets increase echoes.
There is a time delay before an echo.
Sound travels relatively slowly.
7.
True or false? Curtains and carpets absorb sound.
True
False
8.
Which statement is correct?
Dolphins use echolocation to find fish.
Distance = speed × time.
Carpets increase echoes.
An echo is a new sound made by the wall.
9.
A surface absorbs 80% of 200 J of sound. Energy reflected?
120 J
200 J
160 J
40 J
10.
Sea depth measured by sonar along a route. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 3
A
B
C
D
11.
Which is the correct definition of “Echo”?
Reflected sound.
Carried by electrons in wires.
Charge built up on an insulator by rubbing.
Electron that can move through a metal.
12.
Reverberation time in rooms (s). What is the value for Bedroom?
Dr Dabour Hub Academy - figure 4
0.4
5.1
0.7
2.3
13.
Echo delay against distance to a wall. At what value of "Distance (m)" is "Delay (s)" greatest?
Dr Dabour Hub Academy - figure 5
34
68
170
136
14.
Dolphins use ____ to find fish.
echolocation
radar
smell
light
15.
Sound reflects off surfaces such as cave ____.
light
water vapour
air
walls
16.
Which term matches this definition? “Animals using echoes to find prey.”
Neutral wire
Lightning
Echolocation
Ammeter
17.
Sound absorbed by materials (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 6
A
B
C
D
18.
Which statement is correct?
Ultrasound scans use X-rays.
An echo is a new sound made by the wall.
Echoes from a cliff 170 m away return after 1 s.
Carpets increase echoes.
19.
True or false? Concert halls use soft materials to reduce reverberation.
True
False
20.
Distance to wall = speed × time ÷ ____.
2
4
1
10
21.
Echo delay against distance to a wall. Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 7
"Delay (s)" increases as "Distance (m)" increases
"Delay (s)" decreases as "Distance (m)" increases
"Delay (s)" stays the same
"Delay (s)" rises to a peak at 170, then falls
22.
Sound absorbed by materials (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 8
A
B
C
D
23.
Echo delay against distance to a wall. Between which two values of "Distance (m)" did "Delay (s)" change the most?
Dr Dabour Hub Academy - figure 9
102 and 136
68 and 102
34 and 68
136 and 170
24.
Sea depth measured by sonar along a route. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 10
A
B
C
D
25.
Sound absorbed by materials (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 11
A
B
C
D
26.
Sea depth measured by sonar along a route. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 12
A
B
C
D
27.
Which statement is correct?
Sonar uses light.
Distance = speed × time.
Carpets increase echoes.
Sound travels relatively slowly.
28.
Sound absorbed by materials (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 13
A
B
C
D
29.
Which statement is correct?
Soft surfaces give strong echoes.
Sonar uses light.
A shorter delay means the wall is closer.
Distance = speed × time.
30.
Sound absorbed by materials (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 14
A
B
C
D
31.
Reverberation time in rooms (s). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 15
A
B
C
D
32.
True or false? Sound travels to the wall and back.
True
False
33.
Which statement is NOT correct?
Echoes arrive instantly.
Curtains and carpets absorb sound.
Ships use sonar to measure sea depth.
Sonar can find shoals of fish.
34.
Sound absorbed by materials (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 16
A
B
C
D
35.
Hard flat surfaces give ____ echoes.
weak
no
strong
silent
36.
Which term matches this definition? “Sound energy taken in by a surface.”
Absorption
Circuit symbol
Battery
Coulomb
37.
Which term matches this definition? “Reflected sound.”
Ear canal
Electrostatic force
Friction
Echo
38.
An echo returns after 0.2 s (sound 340 m/s). Distance to the wall?
68 m
1700 m
34 m
340 m
39.
An echo returns after 1 s (sound 340 m/s). Distance to the wall?
17 m
170 m
340 m
1700 m
40.
Sound travels relatively ____.
fast
slowly
backwards
instantly
41.
Which statement is NOT correct?
Sound travels to the wall and back.
Concert halls use soft materials to reduce reverberation.
Sound reflects off surfaces such as cave walls.
Bats use infrasound.
42.
Reverberation time in rooms (s). What is the value for Bedroom?
Dr Dabour Hub Academy - figure 17
5.4
0.8
0.5
2.2
43.
An echo returns after 2 s (sound 340 m/s). Distance to the wall?
170 m
340 m
680 m
3400 m
44.
Cinema walls are covered with soft materials to ____ sound.
absorb
amplify
make
reflect
45.
Sound absorbed by materials (%). Which has the greatest value?
Dr Dabour Hub Academy - figure 18
Concrete
Wood
Glass
Foam
46.
Concert halls use soft materials to reduce ____.
reverberation
seating
heat
light
47.
True or false? An echo is a new sound made by the wall.
True
False
48.
True or false? Distance = speed × time.
True
False
49.
Sound absorbed by materials (%). What is the total of all the values?
Dr Dabour Hub Academy - figure 19
201
93
182
163
50.
Reverberation time in rooms (s). About how many times bigger is Cathedral than Bedroom?
Dr Dabour Hub Academy - figure 20
12.7
6.4
25.5
19.1
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Part of Chapter 3: Sound — see every lesson and quiz in this unit.
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