Sound and Echo

When sound is incident on the surface of a medium it bounces back on the first medium. This phenomenon is called

• Refraction of sound

• Deflection of sound

• Reflection of sound

• Defraction of sound

Tags

NGSS.MS-PS4-2

Echoes may be heard more than once due to

• Multiple reflections

• Single time reflection

• Refraction

• Diffraction of waves

Tags

NGSS.MS-PS4-2

The total distance covered by a sound wave from the generation point to reflecting surface and back should be

• 17m

• 15m

• 10m

• 34m

Which principle do bats use to avoid hitting against the obstacles in their paths?

• Seeing

• Echolocation

• SONAR

• None of these

What is the full form of SONAR

• Small navigation and random

• Sky navigation and ranging

• Sound navigation and ranging

• Sun nuclear ranging

Why is Echo used in concert halls?

• To hear abrupt endings

• To hear unpleasant music

• To enhance sound and produce a pleasing effect

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

Which of these is a sound absorbing material

• Mirrors

• Metal surfaces

• Gunny bags

• Hard objects

Tags

NGSS.MS-PS4-2

The sound produced in Sitar ,Veena are produced by ______ strings

• Taut

• Vibrating

• Musical

• Thinner

Tags

NGSS.MS-PS4-2

NGSS.MS-PS4-1

Which are wind instruments (can select more than 1 option)

• Shehnai

• Sarod

• Dholak

• Trumpets

What type of instruments are these :- viola , cello , bass , etc

• Wind instruments

• Percussion instruments

• Stringed instruments