Questions :-

1.The acronym SONAR stands for
a)Sound Navigation And Ranging
b)Sound Navigation And Ringing
c)Sound Navigation And Ranging
d)Sound Narration And Ranging

2.Which part of human ear collects sound from the surroundings?
a)Hammer
b)Stirrup
c)Pinna
d)Cochlea

3.The transmitter produces and transmits
a)Infrasonic waves
b)Ultrasonic waves
c)Longitudinal
d)Both a and c

4.Dolphins, bats and porpoise use ……… for navigation and location of food in the dark.
a)Ultras
b)Infrasound
c)Both a and b
d)None of them

5.Which part of human ear converts sound vibrations into electrical signals?
a)Hammer
b)Cochlea
c)Tympanic membrane
d)Stirrup

6.The sensation of sound persists in our brain for about
a)0.1 s
b)344m/s
c)0.2 s
d)2 s

7.Speed of sound depends upon
a)Temperature of source producing sound
b)Pressure of the medium
c)Temperature of the medium
d)Temperature and pressure of medium

8.Sound is produced due to
a)Propagation of compound
b)Density of the medium
c)Vibration of different objects
d)None of these

9.The wavelength of a sound wave whose frequency is 220 Hz and speed is 440 mils in a given medium is.
a)10 m
b)2 m
c)0.2 m
d)None of these

10. What is the roll of middle ear?
a)Collects sound waves
b)Amplifies the sound waves
c)Converts amplified sound energy into electrical energy
d)Conveys to brain as nerve impulse for interpretation