Skincare Sun Protection and SPF 2

Question 1

Physical (mineral) sunscreens work by:

Accepted Answer

Reflecting and scattering UV radiation away from the skin

Answer

Physical sunscreens containing zinc oxide and titanium dioxide work by reflecting and scattering UV rays away from the skin.

Question 2

Which two ingredients are the only FDA-approved active sunscreen ingredients classified as 'generally recognized as safe and effective' (GRASE)?

Accepted Answer

Zinc oxide and titanium dioxide

Answer

The FDA has classified only zinc oxide and titanium dioxide as GRASE sunscreen ingredients in its updated sunscreen guidelines.

Question 3

What is photoaging?

Accepted Answer

Premature aging of the skin caused by chronic UV exposure

Answer

Photoaging refers to premature skin aging caused by chronic sun exposure, resulting in wrinkles, pigmentation changes, and loss of elasticity.

Question 4

Which UV wavelength is almost entirely absorbed by the ozone layer and does not typically reach the Earth's surface?

Accepted Answer

UVC

Answer

UVC rays have the shortest wavelengths and highest energy but are absorbed by the ozone layer before reaching Earth's surface.

Question 5

The PA+ rating system (used on many Asian sunscreens) measures protection against which type of UV radiation?

Accepted Answer

UVA rays

Answer

The PA+ system (Protection Grade of UVA) measures UVA protection, with more plus signs indicating higher UVA protection.

Skincare Practice Test