Question

11. You are walking one high noon going home from school. You are aware that
exposure to sunlight can lead to certain skin diseases. What material can you
use to block the rays of the sun that damages your skin.
A. umbrella
B. books
C.bag
D. raincoat​

Answer 1

Answer:

A.

Explanation:

Any other choice except D is absurd. I wouldn't chose D because, it would allow more heat.

Answer 2

Answer:
A

Explanation:
This surface will both heat the surrounding air and radiate heat away as infrared light. Both have the effect of cooling the umbrella. Give it even a tiny bit of wind, and the hot air beneath the umbrella is quickly blown away, cooling the umbrella from the other side as well.