NDA Physics
Sound — Quiz
20 Questions · No Negative Marking
Question 1
The speed of sound in an ideal gas is v = √(γP/ρ) = √(γRT/M). This is the Laplace correction to Newton's formula because sound propagation is:
AIsothermal — temperature stays constant during each compression
BAdiabatic — compressions are too rapid for heat exchange with surroundings
CIsobaric — pressure remains constant throughout propagation
DIsochoric — volume of the medium stays constant during propagation
Question 2
In a closed organ pipe of length L, the fundamental frequency is f₁ = v/4L. The harmonics present are:
AAll harmonics (f₁, 2f₁, 3f₁, ...)
BOnly odd harmonics (f₁, 3f₁, 5f₁, ...)
COnly even harmonics (2f₁, 4f₁, 6f₁, ...)
DOnly the fundamental (no overtones)
Question 3
Two tuning forks of frequencies 256 Hz and 260 Hz are sounded together. The beat frequency and the number of beats heard in 5 seconds are:
A4 Hz and 20 beats
B2 Hz and 10 beats
C8 Hz and 40 beats
D4 Hz and 4 beats
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