Question

Match the pairs.
Group A
A) Flute
B) Frequency
C) Sound level
D) Ultrasonic sound
E) Infrasonic sound
Group B
1) Frequency less than 20 Hz
2) Frequency more than 20000 Hz
3) Vibrations in the air
4) Measured in Hz
5) Decibel

Answer 1

1) Flute = Vibrations in the air
2) Frequency = Measured in HZ
3) Sound level = Decibel
4) Ultrasonic sound = Frequency more than 20000HZ
5) Infrasonic sound = Frequency less than 20 Hz

Answer 2

Answer:

Group A                                             Group B  

A) Flute                                              (3) Vibrations in the air.

B) Frequency                                     (4) Measured in Hz.    

C) Sound level                                   (5) Decibel.

D) Ultrasonic sound                          (1)  Frequency less than 20 Hz.

E) Infrasonic sound                          (2) Frequency more than 20000 Hz.

           

Explanation:

(A): Flute produces the vibrations in the air which is audible by us so out of all the given matches (3) vibrations in the air is correct match.

(B): Frequency is measured in units of Hertz. Hertz is its SI unit. Therefore,  correct match for it is (4) Measured in Hz.

(C): Sound level is measured in decibels. Decibel is SI unit of measuring sound level. Therefore, (5) Decibel is the correct match.

(D) Ultrasonic sound have frequency range above 20000 Hz. Therefore its correct match is (2) Frequency more than 20000 Hz.

(E): Infrasonic sound have frequency range below 20 Hz. Therefore its correct match is (1) Frequency less than 20 Hz.