Physics 10 Chapter 11 - Sound - 12

Physics 10 Chapter 11 - Sound - 12

1. Which of the following relation between loudness and intensity of sound is true?

a) L = K log I
b) L = 1 / K log^-11
c) L = 1 / K log I
d) L = K log^-11

2. Upon which of the following, the frequency of tuning fork depends?

a) Width of tuning fork
b) Area of tuning fork
c) Length of tuning fork
d) Mass of tuning fork

3. What is the difference between loudness of an unknown sound and the loudness of faintest sound called?

a) Peak intensity
b) Least intensity
c) Intensity measure
d) Intensity level

4. What is the formula of intensity level of an unknown sound?

a) Sound level = K antilog (I / Io)
b) Sound level = K log (I / Io)
c) Sound level = Log (I / Io)
d) Sound level = Antilog (I / Io)

5. Upon which of the following the value of K depends?

a) Unit of intensity level
b) Unit of I
c) All of these
d) Unit of Io

6. If I = 10Io and the unit of intensity level is bel, then what will be the value of K?

a) 4
b) 2
c) 1
d) 3

7. If K = 1, then what will be the formula of intensity level?

a) Sound level = Antilog (I - Io) (bel)
b) Sound level = Log (I - Io) (bel)
c) Sound level = Log (I / Io) (bel)
d) Sound level = Antilog (I + Io) (bel)

8. How is decibel abbreviated?

a) Decibel = DB
b) Decibel = dB
c) Decibel =Db
d) Decibel = db

9. If at Anarkali bazaar Lahore, intensity level is 80 dB, what will be the intensity of sound there?

a) 10^-2 Wm^-2
b) 10-8 Wm^-2
c) 10-6 Wm^-2
d) 10-4 Wm^-2

10. How many bel is equal to 10dB?

a) 3
b) 4
c) 1
d) 2

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