Propagation of sound — task. Physics CBSE Live product, Class 9 (2026-27).

Choose the correct answer:

1. A student plucks a stretched rubber band and hears a sound. The sound reaches another student standing nearby through air. Which sequence correctly describes what happens?

The rubber band vibrates \(\to\) sound travels without involving air particles.
The rubber band vibrates \(\to\) compressions and rarefactions form in air \(\to\) sound reaches the listener.
The rubber band vibrates \(\to\) transverse sound waves move through air.
The rubber band vibrates \(\to\) air particles travel from the band to the listener.

2. Which statement correctly combines the major ideas about sound discussed in this chapter?

Sound and light require identical conditions for propagation.
Sound is produced only in air.
Sound is produced by vibrating objects, travels as a longitudinal mechanical wave through a material medium, and consists of compressions and rarefactions.
Sound is a transverse wave that can travel through vacuum.

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1. Propagation of sound

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