UPSC Civil Service Exam Questions - Engineering

Q1:

Which type of light energy is effectively absorbed by CO2 in the lower boundary of the troposphere ?

A X - rays

B UV - rays

C Visible light

D Infra-red rays

ANS:D - Infra-red rays

Infrared rays are effectively absorbed in the lower boundary of the troposphere. Because it has a greater wavelength. And co2 is a greenhouse gas.

So, the right answer is (D).