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Circle the odd one out:
a) Hearing loss, blood pressure, physical pain, noise.
b) Amplitude of vibration, frequency, decibel, quality.
c) Sound, water, vacuum, steel, air.
d) Oval window, eardrum, multiple refraction, auditory nerve.

 a) noise

c)steel

i am not sure about b and d 

well i think b) quality

and d)oval window

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What is the reason
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In :-
    a it is noise as others are causes of noise pollution.
    b  it is quality as others determine the quality of a sound.
    c  it is sound as others are mediums.
    d it is multiple refraction as others are the parts of the ear.
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Oval window ,cardrum
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1:- Physical pain as others are related to noise & noise pollution . 2:- Frequency as all others are related to the loudness of the sound 3:- Vacuum because all others are medium to propagate sound and related to sound 4:- Multiple refraction , others are related to ear (eardrum , auditory nerves and oval window i.e. hammer, stirrup and anvil )
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