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5. This is a ONE TIME attempt test. Once started, it cannot be reversed or attempted again.
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1
SONAR stands for ______________.
Sound Navigation And Ranging
Source Navigator And Ranging
Sound Navigation And Reactor
Sound Navigation And Region
2
We can reduce reverberation by _________________
Acoustic foam
.Adding furniture to the room
Covering windows with curtains
All of these.
3
_______________ is used for the examination of foetus during pregnancy to detect any growth abnormalities, which helps in taking the necessary action to rectify the abnormalities.
Ultrasonography
Infrasonography
sonography
None of these.
4
High pressure regions of sound waves are known as ________________________.
Waves
Compressions
Rarefactions
5
Sound Board is a ___________ board placed behind the stage in big halls, so that sound after reflecting from sound board, spreads evenly across the width of the hall.
Flat
Broad
Convex
Concave
6
The repetition of sound caused by reflection of sound waves is called an __________________.
Vibrations
Echo
Signals.
7
Ultrasound is used to investigate the internal organs like ______________of human body.
Liver
Gall bladder
Kidney
8
The disadvantages of reverberation are ______________ .
It enhance sound quality.
Used in music.
Inability of the listener to listen clearly.
9
Low pressure regions of sound waves are known as ________________________.
Compression
Rarefaction
10
Which of the following are correct :
(a) Ultrasounds are low frequency waves.
(b) Ultrasounds are high frequency waves.
Only (a) is correct.
Only (b) is correct.
Both (a) and (b) are correct.
11
(a) Megaphone is large cone shaped device used to amplify and direct the voice of a person who speaks into it.
(b) A horn is a cone shaped instrument used for signalling in bicycles, cars, buses, etc.
12
(a) Sound Board is a concave board (curved board) placed behind the stage in big halls.
(b) Sound Board is a convex board (curved board) placed behind the stage in big halls.
13
(a) Ultrasound is used in industry for detecting flaws (cracks, etc.) in metal blocks without damaging them.
(b) Metal blocks are used in the construction of big structures like bridges, machines and scientific equipment, etc.
14
(a) Pinna collects the sound waves from the surroundings.
(b) The pressure variations are turned into electrical signals by the cochlea.
(c) The electrical signals are carried by auditory nerve.
Only (c) is correct.
15
(a) The sound of frequencies lower than 20 Hz are known as infrasonic sounds.
(b) The sound of frequencies lower than 200 Hz are known as ultrasonic sounds.
(c) The sounds of frequencies higher than 20000 Hz are called ultrasonic sounds.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.