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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper I, General Studies · Q110 of 120

Geo-Scientist Prelims 2020 General Studies Q110: Which one of the following statements is NOT true about the sound…

QuestionPhysics / sound

Which one of the following statements is NOT true about the sound waves?

  1. (a) Sound waves are longitudinal in nature
  2. (b) Sound waves can propagate through water
  3. (c) Speed of sound waves in steel is more than its speed in air
  4. (d) Sound waves can propagate through vacuum

Answer: (d) Sound waves can propagate through vacuum

Sound is a mechanical, longitudinal wave; it needs a medium and cannot travel through vacuum. It travels faster in solids (steel ~5,000 m/s) than in air (~343 m/s).

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