Longitudinal and Transverse Waves NEET Questions

Physics - Oscillations and Waves

Longitudinal and Transverse Waves MCQ Questions


13.
In a longitudinal wave, a rarefaction is a region where:
A.
Air density and pressure are lower than normal (molecules are spread apart)
B.
Air molecules are at their equilibrium positions
C.
The particle displacement is zero
D.
Air density and pressure are higher than normal
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ANSWER :
A. Air density and pressure are lower than normal (molecules are spread apart)
14.
When a single sudden push-pull of a piston in a pipe filled with air is made, it generates:
A.
Standing waves in the pipe
B.
Only a compression with no accompanying rarefaction
C.
A single pulse consisting of one compression region followed by one rarefaction region
D.
A continuous sinusoidal wave of indefinite duration
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ANSWER :
C. A single pulse consisting of one compression region followed by one rarefaction region
15.
If the push-pull of a piston in a pipe filled with air is continuous and sinusoidal, it generates:
A.
Standing waves only, with no travelling component
B.
A continuous sinusoidal longitudinal wave — a periodic train of compressions and rarefactions propagating along the pipe
C.
A single pulse that grows larger with each cycle
D.
A transverse wave in the air column
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ANSWER :
B. A continuous sinusoidal longitudinal wave — a periodic train of compressions and rarefactions propagating along the pipe
16.
The pressure variation in a sound wave propagating in the +x direction can be described as:
A.
ΔP = constant everywhere
B.
ΔP = 0 everywhere (only density changes, not pressure)
C.
A triangular wave of pressure varying linearly with position
D.
A sinusoidal variation in pressure: ΔP(x,t) = ΔP_max sin(kx − ωt + φ), which is 90° out of phase with displacement
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ANSWER :
D. A sinusoidal variation in pressure: ΔP(x,t) = ΔP_max sin(kx − ωt + φ), which is 90° out of phase with displacement
17.
How does a transverse wave pulse propagate along a stretched string?
A.
Electrons in the string carry the wave energy from one end to the other
B.
The string vibrates as a rigid rod, displacing end-to-end
C.
String elements travel along the string carrying their displacement with them
D.
Each string element, when displaced transversely by its neighbour, is pulled back by tension toward equilibrium, creating a wave that moves along the string while individual elements oscillate up and down
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ANSWER :
D. Each string element, when displaced transversely by its neighbour, is pulled back by tension toward equilibrium, creating a wave that moves along the string while individual elements oscillate up and down
18.
How does a longitudinal sound wave propagate through air?
A.
Air heats up and transfers energy by convection
B.
Electrons in air carry the sound energy as electromagnetic waves
C.
Through a chain of elastic collisions and interactions: a compressed region pushes adjacent molecules into the next region, shifting the compression forward while the original region undergoes rarefaction
D.
Air molecules physically travel from the source to the listener
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ANSWER :
C. Through a chain of elastic collisions and interactions: a compressed region pushes adjacent molecules into the next region, shifting the compression forward while the original region undergoes rarefaction