Q. Which type of wave is sound wave?
Answer: Longitudinal wave
Notes: Sound is a longitudinal wave. Longitudinal wave is a wave where the direction of propagation of the wave and movement of particles is in the same direction where as in transverse wave they are perpendicular to each other. 
Extra info: Example of transverse wave is light wave (electromagnetic wave).

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 51 in Physics GK 16 - Sound Waves in above course in App.