Physics 10 Chapter 11 - Sound - 11

Physics 10 Chapter 11 - Sound - 11

1. What is the intensity of barely audible sound?

a) 10^-2 Wm^-2
b) 1 Wm^-2
c) 0.1 Wm^-2
d) 10^-1 Wm^-2

2. What is the intensity of faintest audible sound?

a) 0.1 Wm^-2
b) 10^-1 Wm^-2
c) 10^-2 Wm^-2
d) 1 Wm^-2

3. Which intensity of sound is taken as reference intensity?

a) 0.1 Wm^-2
b) 10^-1 Wm^-2
c) 1 Wm^-2
d) 10^-2 Wm^-2

4. What is the value of zero bel?

a) 10^-1 Wm^-2
b) 1 Wm^-2
c) 0.1 Wm^-2
d) 10^-2 Wm^-2

5. After which scientist, the unit bel was named?

a) Alexander Graham Bell
b) F. M Wohler Bell
c) Albert Bell
d) Isaac Bell

6. What was the unit called that was named after Alexander Graham Bell?

a) Gram
b) Bel
c) Newton
d) Alex

7. The loudness of a sound is directly proportional to the.............................?

a) Logarithm of intensity of sound
b) Logarithm of frequency of sound
c) Antilogarithm of intensity of sound
d) Antilogarithm of frequency of sound

8. According to which law, the loudness of a sound is directly proportional to the logarithm of intensity of sound?

a) Vital force theory
b) Law of loudness
c) Law of conservation of intensity
d) Weber Fechner law

9. According to Weber Fechner law, which of the following relation between loudness and intensity of sound is true?

a) L ∞ log I
b) L ∞ 1 / log I
c) L ∞ Antilog I
d) L ∞ 1 / Antilog I

10. How many bel is equal to 10^-1 Wm^-2? value="a" id="10aq" onClick="Touch(this,10,id,1,0)">a) Two bel
b) One bel
c) Zero bel
d) Three bel

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