Solved UPSC CDS/OTA Question
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Q · Waves and SoundEasy · 45s
Which of these changes will increase the speed of sound in air? 1. Increase in temperature 2. Increase in humidity 3. Decrease in air pressure Select the correct answer:
TopicWaves and Sound
Question Typemultiple choice
DifficultyEasy
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
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Higher temperature increases molecular motion → higher speed of sound.
Higher humidity lowers air density → higher speed of sound.
Air pressure doesn’t affect speed in air at constant temperature.
Final Answer: Option A - 1 and 2 only