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UPSC 2001: Consider the following statements regarding earthquakes: I. The intensity of an earthquake is measured on the Mercalli scale. II. The magnitude of an earthquake is a measure of energy released. III. Earthquake magnitudes are based on direct measurements of the amplitude of seismic waves. IV. In the Richter scale, each whole number demonstrates a hundred-fold increase in the amount of energy released. Which of these statements are correct?
(a)I, II and III
(b)II, III and IV
(c)I and IV
(d)I and III
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Not attemptedCorrect Answer: (a) I, II and III
Earthquake intensity is gauged by the Modified Mercalli scale (I); magnitude expresses total energy released (II); and magnitude is calculated from seismic-wave amplitude (III). Statement IV is incorrect because each whole number step on the Richter scale represents about 31.6-times more energy, not a hundred-fold. Therefore statements I, II and III only are correct (option a). ([tarunias.com](https://tarunias.com/exams/upsc-notes/earthquakes/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2001 Geography question?▼
The correct answer is option (a): I, II and III. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physical Geography & Geomorphology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2001, GS Paper 1, as Question 59. It falls under Geography > Physical Geography & Geomorphology.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physical Geography & Geomorphology?▼
UPSC has asked 25 questions from Physical Geography & Geomorphology (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.