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NDA 2026 · PYQ · Physical Geography / Earthquakes · easy

Consider the following statements: I. Earthquake waves are basically of two types, namely body waves and surface waves. II. The body waves interact with the surface rocks and generate surface waves. Which of the statements given above is/are correct?

  1. A.I only
  2. B.II only
  3. C.Both I and II✓ Correct
  4. D.Neither I nor II

Explanation

Statement I is correct: seismic waves released from the focus of an earthquake are broadly divided into body waves (P and S waves), which travel through the Earth's interior, and surface waves (Love and Rayleigh), which travel along the Earth's surface. Statement II is also correct as per NCERT: when body waves reach the surface, their interaction with the surface rocks generates new types of waves called surface waves, which travel along the surface and are responsible for most of the damage caused by earthquakes. Both statements are correct.
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