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Multiple choice general knowledge science & technology

The Centre for Disease Control, United States, and doctors in Washington recommend use of N95 respirators for protection. What is this N95 indicates?

  1. . It was the name given by Alexander von Humboldt who introduced it as his 95th design.

  2. It is a codename given by the company which manufactured it for the first time in 1995.

  3. This is a rating, which means the mask will filter at least 95% airborne particles.

  4. The nickname the mask obtained when it was continuously sold for 95 cents in USA.
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C Correct answer
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