Ultrasonics quiz

The instrument directly calibrated to show the depth of the sea is called

• Odometer

• Fathometer

• Lactometer

• Barometer

The word SONAR is derived from

(a)  

-------------- are acoustical waves with frequencies higher than 20 kHz

(a)  

Crystal used for generating ultrasonic waves is

• quartz

• NaCl

• KCl

• Nickel

The reflected signal is known as

(a)  

The distance of the sea can be calculated using the formula

•  $d=\frac{v}{2}$  

•  $d=\frac{v\times l}{4}$  

•  $d=\frac{v\times t}{2}$  

•  $d=\frac{v\times t}{4}$  

Which method is used to detect submerged submarines?

(a)  

ultrasonic waves are highly

(a)  

Which device transmits the ultrasonic waves towards the bed of the sea?

• Transmitter

• Transistor

• Transformer

• Transducer

Which device transmits the ultrasonic waves towards the bed of the sea?

(a)