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Final Assessment: Sound

Section A: Production and Propagation

Question 1mcq
How is sound produced?
A.Chemical symbols
B.Only light
C.Vibrations
D.Still objects
Question 2mcq
In a flute, what vibrates mainly to produce sound?
A.Air column
B.Metal nucleus
C.Cell wall
D.Water only
Question 3mcq
What does sound need in order to travel?
A.No particles
B.Light ray
C.Vacuum
D.Material medium
Question 4mcq
Which option correctly completes this statement: Sound travels faster in steel than air because particles are?
A.Non-vibrating
B.Absent
C.More colourful
D.Closer together
Question 5mcq
In longitudinal waves, particles vibrate?
A.Perpendicular only
B.In circles only
C.Not at all
D.Parallel to wave direction

Section B: Wave Properties and Calculations

Question 6mcq
What is the SI unit of frequency?
A.joule
B.hertz
C.newton
D.watt
Question 7mcq
In sound, what does a larger amplitude usually mean?
A.Louder sound
B.No sound
C.Lower pitch always
D.Slower sound always
Question 8mcq
If T=0.01 sT=0.01\,s, frequency is?
A.0.01 Hz0.01\,Hz
B.10 Hz10\,Hz
C.1 Hz1\,Hz
D.100 Hz100\,Hz
Question 9mcq
Which relation connects wave speed, frequency and wavelength?
A.v=fλv = f\lambda
B.F=maF=ma
C.P=W/tP=W/t
D.W=FsW=Fs
Question 10mcq
f=200 Hzf=200\,Hz, λ=1.5 m\lambda=1.5\,m. What is the speed?
A.201.5 m/s201.5\,m/s
B.300 m/s300\,m/s
C.30 m/s30\,m/s
D.133 m/s133\,m/s

Section C: Hearing, Reflection and Applications

Question 11mcq
What is the approximate human hearing range?
A.Only 340 Hz340\,Hz
B.1 Hz1\,Hz to 2 Hz2\,Hz
C.20 Hz20\,Hz to 20000 Hz20000\,Hz
D.20000 Hz20000\,Hz to 40000 Hz40000\,Hz
Question 12mcq
Hard, smooth surfaces are good at doing what to sound?
A.Reflecting sound
B.Creating vacuum
C.Absorbing all sound only
D.Removing frequency
Question 13mcq
What causes an echo?
A.Reflection of sound
B.Friction
C.Refraction of light
D.Osmosis
Question 14mcq
What does echolocation use?
A.Static electricity
B.Chemical reactions
C.Reflected light only
D.Reflected sound waves
Question 15mcq
Which option correctly completes this statement: To test effect of string length on pitch, keep tension?
A.Unknown
B.Random
C.Constant
D.Zero
Question 16mcq
A wave graph with more cycles per second has higher?
A.Frequency
B.Mass
C.Valency
D.Work