Force and Pressure — Science STD 8 — Question

Richter scale measures the strength of earthquakes

Richter scale measurement of the earthquake	Example of damages due to the earthquake
3.0-3.9	No damages but some vibrations felt
4.0-4.9	Cracks in windows, some unstable objects fall
5.0-5.9	Building walls may collapse. movement of furniture
6.0-6.9	Building roofs may collapse. loss of few lives
7.0-79	Cracks on ground, underground pipes broken, loss of many lives

(i) The damages from an earthquake are listed below.
2 people died
5 building roofs collapsed
12 building walls collapsed
What could be the likely reading on the richter scale for the earthquake?
(a) 4.8
(b) 5.4
(c) 6.5
(d) 7.3
(ii) Which of these statements is true about earthquake?
(a) Earthquakes can cause soil erosion.
(b) Most of the earthquakes occur in mountain regions.
(c) The location and duration of earthquakes can be predicted.
(d) Earthquakes are caused by the movement of underground plates.

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