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WorksheetsSound and Echo
Total questions: 15
Worksheet time: 4mins
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
Echoes may be heard more than once due to
Multiple reflections
Single time reflection
Refraction
Diffraction of waves
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
Which of these is a sound absorbing material
Mirrors
Metal surfaces
Gunny bags
Hard objects
The sound produced in Sitar ,Veena are produced by ______ strings
Taut
Vibrating
Musical
Thinner
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
In human beings sound is produced by
Stirrup
Cochlea
Larynx
Anvil
The sounds that can be perceived or heard by human ears is called (write all in small case)
(a)
The sound with frequency above 20,000 Hz is called
Sonic
Ultimate
Subsonic
Ultrasonic
The length of the air column in the silt can be changed by varying the thickness of ___________.
Vocal cords
Vocal box
Trachea
What is the sonic range of audible sounds
2 Hz to 20,000 Hz
20 Hz to 20,000 Hz
20 Hz to 2000 Hz
200 Hz to 20,000 Hz
