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What is the shape of an ear canal seal?

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in Casting-Forming-Welding I by (687k points)
What is the shape of an ear canal seal?

(a) Spherical

(b) Cylindrical

(c) Conical

(d) Pyramidal

The question was posed to me in an online interview.

My question is based upon Foundry Environment Health and Safety topic in portion Foundry Environment Health & Dust Problem in Foundries of Casting-Forming-Welding I

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The correct answer is (c) Conical

The explanation is: Ear canal seals are a type of hearing protectors which help in reducing the noise level heard by the employee. These are an option to plug type protectors. The shape of ear canal seals is conical.

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