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NDA 1 2024 GAT, question 109

Topic: Geography

Q109

Which of the following statements regarding earthquakes is/are correct ?

  1. The point on the Earth's surface directly above the focus is called the epicentre of the earthquake.

  2. Earthquakes generate Primary and Secondary waves that radiate outward from the earthquake focus.

  3. Deep-focus earthquakes are likely to cause more damage than shallow-focus earthquakes.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 1 and 2 onlyCorrect answer
  3. (c) 2 and 3 only
  4. (d) 1, 2 and 3

Solution.

Answer: (b) 1 and 2 only

  1. The epicentre is the surface point above the focus, and P and S body waves originate from the source region.
  2. For comparable earthquakes, shallow sources generally cause stronger nearby surface shaking than deep ones.
  3. Thus statements 1 and 2 hold; statement 3 reverses the usual comparison.