Speed of Sound in Air at Room Temperature Using a Resonance Tube NEET Questions

Physics - Experimental Skills

Speed of Sound in Air at Room Temperature Using a Resonance Tube MCQ Questions


1.
Sound waves in air are:
A.
Electromagnetic waves
B.
Transverse mechanical waves
C.
Standing waves only
D.
Longitudinal mechanical waves
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ANSWER :
D. Longitudinal mechanical waves
2.
The speed of sound in air at 0°C is approximately:
A.
3 × 10⁸ m/s
B.
1500 m/s
C.
331 m/s
D.
300 m/s
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ANSWER :
C. 331 m/s
3.
The speed of sound in air at 20°C (room temperature) is approximately:
A.
331 m/s
B.
1000 m/s
C.
300 m/s
D.
343 m/s
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ANSWER :
D. 343 m/s
4.
The speed of sound in a gas is given by Newton-Laplace formula:
A.
v = √(P/ρ)
B.
v = √(γρ/P)
C.
v = √(γP/ρ), where γ = C_p/C_v (adiabatic index), P = pressure, ρ = density
D.
v = γP/ρ
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ANSWER :
C. v = √(γP/ρ), where γ = C_p/C_v (adiabatic index), P = pressure, ρ = density
5.
Newton's formula for speed of sound in air gives a value LESS than the experimental value because:
A.
Newton was wrong about pressure
B.
Newton ignored gravity
C.
Newton's formula is exact
D.
Newton assumed isothermal process; sound waves are actually adiabatic, requiring the factor √γ = √1.4 ≈ 1.18
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ANSWER :
D. Newton assumed isothermal process; sound waves are actually adiabatic, requiring the factor √γ = √1.4 ≈ 1.18
6.
How does speed of sound in air depend on temperature?
A.
v ∝ T
B.
v ∝ 1/T
C.
v independent of T
D.
v ∝ √T (T in Kelvin); approximate increase of 0.6 m/s per °C near room temperature
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ANSWER :
D. v ∝ √T (T in Kelvin); approximate increase of 0.6 m/s per °C near room temperature