Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Environmental PollutionMedium · 45s
Consider the following statements: 1. Photochemical smog is predominantly formed during winter months. 2. It results mainly from the reaction between nitrogen oxides and hydrocarbons in the presence of sunlight. Which of the statements given above is/are correct?
TopicEnvironmental Pollution
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Photochemical smog is more common during summer due to higher sunlight intensity which drives the reactions. So, statement 1 is incorrect.
Final Answer: Option B — 2 only