Which of these is expected to be the best absorber of sound?

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Iron

Wood

Wool

Cemented wall

answer is C.

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Detailed Solution

Wool is the best absorber of the sound.
For sound to be absorbed by the substance, it must contain pores, holes, or some other opening that allows sound energy to flow through and be absorbed. Wool is the alternative in this case because it has pores through which sound energy may be drawn in and absorbed.
On the other side, iron, wood and cemented walls have pores but in a small amount and also the size of the pores is too small.

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