Longitudinal and Transverse Waves NEET Questions

Physics - Oscillations and Waves

Longitudinal and Transverse Waves MCQ Questions


7.
Longitudinal waves can propagate in:
A.
All elastic media — solids, liquids, and gases
B.
Only solids and liquids, not gases
C.
Only gases
D.
Only solids
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ANSWER :
A. All elastic media — solids, liquids, and gases
8.
A medium like steel can support BOTH transverse and longitudinal waves because:
A.
Steel is denser than most other materials
B.
Steel has both a shear modulus (G > 0) and a bulk modulus (B > 0)
C.
Steel is a solid with high electrical conductivity
D.
Steel molecules are arranged in a special hexagonal lattice
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ANSWER :
B. Steel has both a shear modulus (G > 0) and a bulk modulus (B > 0)
9.
Air can sustain only longitudinal waves and NOT transverse waves because:
A.
Air molecules are too small to oscillate transversely
B.
Air has bulk modulus (B > 0) but zero shear modulus (G = 0) — it cannot resist shearing deformation
C.
The density of air is too low for transverse wave propagation
D.
Air is transparent to transverse waves but not longitudinal waves
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ANSWER :
B. Air has bulk modulus (B > 0) but zero shear modulus (G = 0) — it cannot resist shearing deformation
10.
Seismic waves generated during an earthquake include both P-waves (primary) and S-waves (secondary). What are these?
A.
Both P-waves and S-waves are transverse
B.
P-waves are transverse; S-waves are longitudinal
C.
P-waves are longitudinal (compression) waves; S-waves are transverse (shear) waves
D.
Both P-waves and S-waves are longitudinal
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ANSWER :
C. P-waves are longitudinal (compression) waves; S-waves are transverse (shear) waves
11.
The discovery that seismic S-waves do NOT pass through Earth's outer core is evidence that:
A.
S-waves are converted to P-waves at the core-mantle boundary
B.
The outer core is a solid but with very high density
C.
The outer core is in a liquid state (zero shear modulus), which prevents transverse wave propagation
D.
S-waves are absorbed by radioactive elements in the core
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ANSWER :
C. The outer core is in a liquid state (zero shear modulus), which prevents transverse wave propagation
12.
In a longitudinal sound wave travelling through air, a compression is a region where:
A.
The wave amplitude is maximum
B.
Air density and pressure are lower than normal
C.
Air density and pressure are higher than normal (molecules are crowded together)
D.
Air molecules are displaced perpendicular to wave direction
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ANSWER :
C. Air density and pressure are higher than normal (molecules are crowded together)