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?
- A.I only
- B.II only
- C.Both I and II
- D.Neither I nor II
Correct answer
Explanation
The correct answer is C, Both I and II. Earthquake waves are of two basic types, body waves and surface waves, and surface waves are produced when body waves reach the surface and interact with the surface rocks. Body waves start at the focus, the point inside the Earth where energy is released, and travel through the interior in all directions. They are P waves, the fastest, which can pass through solids, liquids and gases, and S waves, which travel only through solids. When body waves meet the surface rocks a new set of waves forms, the surface waves, which move along the surface. Surface waves arrive last at a seismograph but cause the most damage. Option A is wrong because it leaves out statement II, which is also correct. Option B is wrong because it leaves out statement I. Option D is wrong because both statements describe how earthquake waves actually behave. Exam tip: P waves fastest, S waves only through solids, surface waves last and most destructive.
Practice Questions
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- A.Ambala
- B.Dehradun
- C.Haridwar
- D.Agra
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The divide between the two great northern systems does not run along a mountain here but across the almost flat plain of Haryana, and Ambala sits on it, so water falling a little to its west goes to the Ghaggar and the Indus side while water falling to its east…
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- A.Multai in Betul district
- B.Amarkantak in Anuppur district
- C.Janapav in Indore district
- D.Sihawa in Dhamtari district
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Read the full explanation →The Narmada river rises from which of the following?
- A.Amarkantak plateau in Madhya Pradesh
- B.Trimbakeshwar in Maharashtra
- C.Mahabaleshwar in Maharashtra
- D.Brahmagiri range in Karnataka
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The correct answer is A, the Amarkantak plateau in Madhya Pradesh, where the Narmada rises at about one thousand metres and begins its westward journey of some thirteen hundred kilometres through Madhya Pradesh and Gujarat to the Gulf of Khambhat; on the way it makes the Dhuandhar falls and the…
Read the full explanation →Which of the following Indian rivers does not form a delta at its mouth?
- A.Mahanadi
- B.Godavari
- C.Narmada
- D.Krishna
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- A.Antecedent drainage
- B.Superimposed drainage
- C.Inland drainage
- D.Deranged drainage
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These rivers were flowing when the Himalaya was still rising, and instead of being turned aside they cut downward as fast as the land rose, leaving the gorges of the Indus near Gilgit, of the Satluj at Shipki and of the Brahmaputra at the great bend in the Dihang.
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