Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
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Q · Waves and SoundModerate · 45s
Which of the following changes when sound is reflected? 211
TopicWaves and Sound
Question Typemultiple choice
DifficultyModerate
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Reflection changes direction; other properties stay the same.
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Final Answer: Option D — Direction of propagation
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