Veto q&a 7 Month22 (1)

Q & A
@pre-10
Spoofing Bombing Spamming
rekha Mohan
Q
Which one of the following instrument works on
sound
a) Radar b) Sonar
c) CT Scanner d) Internet
(Assistant Grade II - 2013)
A. b) sonar
sound
• Study of sound
acoustics
• Sound waves are longitudinal
• Organ which produces sound
larynx
• Sound travels faster in solids
• Velocity of sound in air
340 m/s
• Speed of the sound in water
1450 to 1498 m/s
• The object in which sound travels with maximum
speed
steel
• Term used to denote the speed lower than the speed
of sound
subsonic
• Term used to denote two times the speed of the
sound
supersonic
Q & A No @ Sea
• Unit of frequency of sound
Hertz (Hz)
• Unit of intensity of sound
Decibel (db)
• Audible frequency of human ear
20 Hz - 20000 Hz
• Audible limit of human ear
120 db
• Sound less than 20Hz
infrasonic
• Sound higher than 20000 Hz
ultrasonic sound
• Shrillness of sound
Pitch
Q & A Instruments
• Instrument used for sound experiment
sonometer
• Instrument used to measure intensity of
sound
audiometer
• Instrument used for the graphic representation
of sound
Oscilloscope
• Instrument used to hear sound in deaf persons
audiophone
• Instrument which is used to produce sound
using light rays
Photophone
• The instrument used to convert sound waves
to electrical impulses
Microphone
• The instrument used to reproduce sound
when once it is recorded
Phonograph
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March 2018