Questions :-

1.To hear a distinct echo the time interval between the original sound and the reflected one must be
a)0.1 s
b)1 s
c)0.2 s
d)0.5 s

2. Which wave property determines loudness?
a)Amplitude
b)Frequency
c)Oscillation
d)Both (a) and (b)

3.Children under the age of 5 can hear upto
a)25 Hz
b)15 Hz
c)20 Hz
d)25 kHz

4.Rhinoceroses communicate using sound wave
a)Infrasound
b)Ultrasound
c)Infrared
d)All of these

5.Sound cannot travel in
a)Medium
b)Vacuum
c)Both (a) and (b)
d)Solids

6.Wavelength is
a)Distance between two consecutive time or two consecutive distance
b)Distance between two consecutive compressions or two consecutive rarefactions
c)Distance between two consecutive compressions or two consecutive loudness
d)None of these

7.The time period of sound wave is
a)Time needed for one complete hour
b)Time needed for the cycle
c)Neither (a) nor (b)
d)None of these

8. A sonar device on a submarine sends out a signal and receives an echo 5s later. The speed of sound in water if the distance of the object from the submarine is 3625 m is
a)1250 m/s
b)1450 m/s
c)1440 m/s
d)None of these

9. Which of the following statement is true about multiple echoes
a)Multiple echoes, heard when sound is rolling
b)Multiple echoes, heard when sound is repeatedly coming out
c)Multiple echoes are heard when sound is repeatedly reflected
d)All of the above

10. Reverberation of sound is used in
a) Stethoscope
b)Trumpets
c) Megaphone
d) All of these

Chapter - 12 Sound Quiz 2 | Class - 9th

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