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Sound Waves 8
Test Description: Sound plays an important role in our life .We use sound to communicate through our voice and to enjoy listening to music .Our Game is about properties of sound
Instructions: Answer all questions to get your test result.
1) Sound propagates in:
A
Liquid Only
B
Gases Only
C
Solid Only
D
All choices
2) Sound wave cannot propagate in
A
Liquid
B
solids
C
Vacum
D
Gases
3) Sound wave is :
A
Light wave
B
None of the above choices
C
Mechanical wave
D
Electromagnetic wave
4) Our Ears are :
A
Sound receivers
B
Sound emitters
C
None of the choices
D
Sound effectors
5) Speakers:
A
All choices
B
Sound emittors
C
Sound effector
D
Sound receivers
6) The audible sound has frequencies:
A
Above 20000Hz
B
Lie between 20HZ and 2000Hz
C
All choices
D
Below 20 Hz
7) Sounds whose frequencies Below 20 Hz is :
A
Ultra sound
B
Audible sound
C
Infrared Sound
D
None of the choices
8) Ultra sounds have frequencies :
A
Equals to 20 Hz
B
Lie between 20 HZ and 20000 HZ
C
Above 20000 Hz
D
Below 20 Hz
9) Echo is a bounce of sound on an obstacle by :
A
Refraction
B
Emision
C
Reflection
D
Absorption
10) The time separating production of sound and receiving its echo is t=2 sec ( Velocity of sound in air is 340m/sec then the distance is :
A
1000 m
B
12320 m
C
1020 m
D
680 m
*select an answer for all questions
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