An earthquake measuring 5 on the Richter scale is more powerful than another of magnitude 4 by
(a) 1.25 times
(b) 100 times
(c) 0.80 times
(d) 10 times

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Solution

(d) 10 times
Richter scale is not a linear scale. An earthquake that measures 5 on it is 10 times more powerful than an earthquake that measures 4.

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An earthquake of magnitude 2 on Richter scale is:

(a) two times as strong as an earthquake of magnitude 1

(b) four times as strong as an earthquake of magnitude 1

(d) hundred times as strong as an earthquake of magnitude 1

On richter scale, an increase in the magnitude of 4 units means that the destructive amplitude of the earthquake increases by 4 times.

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